KR20210137888A - Electronic device for wirelessly transmitting power and wireless power receiving device and method for operating thereof - Google Patents

Abstract

An objective of the present invention is to improve foreign substance detection accuracy. According to various embodiments of the present invention, an electronic device comprises: a power transmitting circuit to transmit power to a wireless power receiving device; a communication circuit configured to perform communication with the wireless power receiving device; and a control circuit. The control circuit can be configured to control the power transmitting circuit to apply a first power to the coil, stop the application of the first power, control the power transmitting circuit to prevent a power from being applied to the coil during a first period, check a first Q-factor during the first period, control the power transmitting circuit to apply at least one power based on a calibration operation to check at least one parameter used for checking power loss when transmitting a power to the coil after the first period, stop the application of the last power among the at least one power, control the power transmitting circuit to prevent a power from being applied to the coil during a second period, check a second Q-factor during the second period, and check the validity of the at least one parameter based on the first Q-factor and/or the second Q-factor. Various other embodiments are possible.

Description

An electronic device for wirelessly transmitting power, a wireless power receiving device for wirelessly receiving power, and an operating method thereof

Various embodiments relate to an electronic device that wirelessly transmits power, a wireless power receiver that wirelessly receives power, and an operating method thereof.

A wireless power consortium (WPC) standard (or Qi standard) supports various foreign object detection (FOD). For example, an electronic device that wirelessly transmits power may apply a ping signal to the coil, and check whether a change in characteristics (eg, frequency and/or Q-factor) occurs. Based on whether the wireless power receiving device or the foreign material is disposed in the charging area may be determined. For example, an electronic device that wirelessly transmits power may receive (or demodulate) information on a level of received power from the wireless power receiver during power transfer. The electronic device, the transmission power (P _PT) level and the received power on the basis of information about the level of the (P _PR), loss of electric power (power loss), loss of power to check the level of the (P _loss) (P _loss of ), it is possible to determine whether foreign matter is disposed during power transmission.

_{The power loss} P loss when the foreign material is disposed may indicate a level of power dissipated in the foreign material from the magnetic field of the electronic device. The electronic device may determine the level of the transmission power P _{PT by subtracting the internal loss power P PTloss} lost inside the electronic device from the level of the _{power P in} provided to the input terminal. The internal loss power (P _PTloss ) in the electronic device is the power loss in the inverter, the power loss in the primary coil, the power loss in the resonant capacitor, the power loss in the shielding of the primary coil assembly, or power loss within any metal part of the electronic device. In addition, the received power P _PR may be confirmed _{by summing the level of the power P out} of the output terminal by the wireless power receiving device and the internal loss power P _{Prloss lost in the wireless power receiving device.} The internal loss power (P _Prloss ) of the wireless power receiver is a power loss in a rectifier, a power loss in a secondary side coil, a power loss in a resonant capacitor, a power loss in the shielding of the secondary coil assembly, or a wireless power receiver at least one of power loss in any metal part of

The electronic device and the wireless power receiver _{may calculate the above-described internal loss powers P PTloss} and P _Prloss , and in this case, a system bias may occur. This bias reduces the accuracy of detecting foreign substances, and in order to remove the influence of the bias, the electronic device and the wireless power receiver may perform calibration. During calibration, the electronic device and/or the wireless power receiver may check the parameter by using the level of _{the transmission power (P PT} ) and the level of the reception power (P _{PR ) in a plurality of load conditions.} have. The electronic device and/or the wireless power receiving device may _{correct the transmit power (P PT} ) and/or the receive power (P _PR ) using the identified parameter, and thus the influence of the bias may be removed to detect foreign substances. Accuracy can be improved. However, if foreign objects are placed during calibration, inaccurate parameters may be calculated. If inaccurate parameters are used for foreign material detection, the foreign material detection accuracy may be reduced.

The electronic device, the wireless power receiver, and the operating method thereof according to various embodiments may verify a parameter calculated as a calibration result based on a Q-factor checked based on the start and/or end of the calibration.

The electronic device, the wireless power receiving device, and the operating method thereof according to various embodiments may check the validity of a parameter calculated as a result of a calibration based on the Q-factor checked at a specified time, and improve the foreign matter detection accuracy have.

According to various embodiments, an electronic device includes a power transmission circuit and a control circuit, wherein the control circuit controls the power transmission circuit so that a first power is applied to a coil of the power transmission circuit, and the first stop application of power, control the power transmission circuit so that no power is applied to the coil for a first period, check a first Q-factor for the first period, and after the first period, transmit power controlling the power transmission circuit so that at least one power is applied to the coil based on a calibration operation for checking at least one parameter used for checking the power loss at the time of application of the last power among the at least one power interrupt, control the power transfer circuit such that no power is applied to the coil for a second period, check a second Q-factor for the second period, and/or the first Q-factor and/or the second Based on the Q-factor, it may be configured to check the validity of the at least one parameter.

According to various embodiments, an apparatus for receiving wireless power includes a coil for receiving power from an electronic device, a rectifier for rectifying AC power output from the coil into DC power, a processor, and a communication circuit, the processor comprising: control the communication circuitry to transmit, via the coil, a first data packet requesting, while the first power is being received, cessation of the application of the first power and the maintenance of the cessation of the application of the power for a first period; Interruption of application of the last power and a second period while the last power of at least one power is received through the coil based on a calibration operation for checking at least one parameter used for checking power loss in power transmission and control the communication circuitry to transmit a first data packet requesting to keep the application of power interrupted during a period of time.

According to various embodiments, an electronic device capable of verifying a parameter calculated as a result of a calibration based on a Q-factor confirmed based on the start and/or end of calibration, an electronic device, a wireless power receiving device, and an operating method thereof are provided. can Accordingly, the validity of the parameters calculated as a result of the calibration may be secured, and the accuracy of detecting foreign substances during power transmission may be improved.

In addition, various effects directly or indirectly identified through this document may be provided.

1 is a block diagram illustrating an apparatus for transmitting power wirelessly and an electronic device according to various embodiments of the present disclosure;
2 is a schematic configuration diagram of a wireless charging system according to various embodiments.
3 is a block diagram illustrating a wireless charging system according to various embodiments.
4 illustrates a level of power input to a transmission coil of an electronic device according to a comparative example for comparison with various embodiments.
5A is a flowchart illustrating a method of operating an electronic device according to various embodiments of the present disclosure;
5B is a graph illustrating a level of transmitted power of an electronic device according to various embodiments of the present disclosure;
6 is a flowchart illustrating a method of operating an electronic device according to various embodiments of the present disclosure;
7 is a graph illustrating a level of transmitted power of an electronic device according to various embodiments of the present disclosure;
8 is a diagram for explaining operations of an electronic device and an apparatus for receiving wireless power according to various embodiments of the present disclosure;
9A shows the structure of a data packet according to a comparative example for comparison with various embodiments.
9B illustrates a structure of a packet RP 1 of received power transmitted by an apparatus for receiving power wirelessly according to various embodiments of the present disclosure.
10 is a flowchart illustrating an operating method of an apparatus for receiving power wirelessly according to various embodiments of the present disclosure.
11A-11F illustrate a receive peak voltage and an output voltage of a rectifier in accordance with various embodiments.
12 is a flowchart illustrating a method of operating an apparatus for receiving power wirelessly according to various embodiments of the present disclosure.
13 is a block diagram of an electronic device in a network environment, according to various embodiments of the present disclosure;

1 is a block diagram illustrating an apparatus for transmitting power wirelessly and an electronic device according to various embodiments of the present disclosure;

Referring to FIG. 1 , an electronic device 101 according to various embodiments may wirelessly transmit power 103 to a wireless power receiving device 195 . In one example, the electronic device 101 may transmit the power 103 according to an induction scheme. When the electronic device 101 is inductive, for example, the electronic device 101 is a power source, a DC-AC conversion circuit, an amplifier circuit, an impedance matching circuit, at least one capacitor, at least one coil, communication It may include a modulation/demodulation circuit and the like. The at least one capacitor may constitute a resonant circuit together with the at least one coil. The electronic device 101 may be implemented in a manner defined in a wireless power consortium (WPC) standard (or Qi standard). In another example, the electronic device 101 may transmit the power 103 according to a resonance method. In the case of the resonance method, the electronic device 101 may include, for example, a power source, a DC-AC conversion circuit, an amplifier circuit, an impedance matching circuit, at least one capacitor, at least one coil, and an out-of-band communication circuit. (eg, BLE (bluetooth low energy) communication circuit) and the like. At least one capacitor and at least one coil may constitute a resonance circuit. The electronic device 101 may be implemented in a manner defined in an Alliance for Wireless Power (A4WP) standard (or an air fuel alliance (AFA) standard). The electronic device 101 may include a coil capable of generating an induced magnetic field when a current flows according to a resonance method or an induction method. A process in which the electronic device 101 generates an induced magnetic field may be expressed as that the electronic device 101 wirelessly transmits power 103 . In addition, the wireless power receiving apparatus 195 may include a coil in which an induced electromotive force is generated by a magnetic field whose size changes according to time formed around it. The process of generating the induced electromotive force through the coil may be expressed as that the wireless power receiving apparatus 195 receives the power 103 wirelessly. For example, the electronic device 101 is a standard for wireless power transmission, and is defined in an airFuel inductive (eg, power matters alliance (PMA)) standard, an airfuel resonant (eg, rezence) standard, or a Qi standard. It can also be implemented in the same way.

The electronic device 101 according to various embodiments may communicate with the wireless power receiver 195 . For example, the electronic device 101 may communicate with the wireless power receiver 195 according to an in-band scheme. The electronic device 101 may perform modulation on data to be transmitted according to, for example, a frequency shift keying (FSK) modulation method, and the wireless power receiver 195 may perform modulation on the data to be transmitted according to an amplitude shift keying (ASK) modulation method. modulation can be performed accordingly. The electronic device 101 and/or the wireless power receiver 195 may determine data transmitted from the counterpart device based on the frequency and/or amplitude of the current, voltage, or power of the coil. The operation of performing modulation based on the ASK modulation method and/or the FSK modulation method may be understood as an operation of transmitting data according to the in-band communication method. Determining the data transmitted from the counterpart device by performing demodulation based on the magnitude of the frequency and/or amplitude of the current, voltage, or power of the coil is an operation of receiving data according to the in-band communication method. can be understood For example, the electronic device 101 may communicate with the wireless power receiver 195 according to an out-of-band scheme. The electronic device 101 or the wireless power receiver 195 may transmit/receive data using a communication circuit (eg, a BLE communication module) provided separately from the coil or patch antenna.

In this document, the electronic device 101 or the wireless power receiver 195 performing a specific operation refers to various hardware included in the electronic device 101 or the wireless power receiver 195, for example, a processor (eg, For example, it may mean that a control circuit such as a transmission IC and/or a micro controlling unit (MCU) or a coil performs a specific operation. Alternatively, when the electronic device 101 or the wireless power receiver 195 performs a specific operation, it may mean that the processor controls other hardware to perform the specific operation. Alternatively, when the electronic device 101 or the wireless power receiver 195 performs a specific operation, the specific operation stored in the storage circuit (eg, memory) of the electronic device 101 or the wireless power receiver 195 is performed. As at least one instruction for performing is executed, it may mean causing a processor or other hardware to perform a specific operation.

2 is a schematic configuration diagram of a wireless charging system according to various embodiments.

Referring to FIG. 2 , a wireless charging system according to various embodiments may include an electronic device 101 and a wireless power receiving device 195 . The electronic device 101 may be a charging pad that wirelessly transmits power based on power supplied from a charger (eg, travel adapter, TA). According to another embodiment, the electronic device 101 is a device including a wireless power transmission function, and may be implemented as, for example, a smart phone, and there is no limitation in the implementation form. The wireless power receiving device 195 may be an electronic device such as a smart phone or a wearable device, and there is no limitation in the implementation form thereof.

3 is a block diagram illustrating a wireless charging system according to various embodiments.

Referring to FIG. 3 , a wireless charging system according to various embodiments may include an electronic device 101 or a wireless power receiving device 195 . When the wireless power receiver 195 is mounted on the electronic device 101 , the electronic device 101 may wirelessly supply power to the wireless power receiver 195 .

According to various embodiments, the electronic device 101 may include a power transmission circuit 311 , a control circuit 312 , a communication circuit 313 , or a sensing circuit 314 .

According to various embodiments, the power transmission circuit 311 receives power (or power) from the outside, a power adapter 311a that appropriately converts the voltage of the input power, and a power generation circuit 311b that generates power ), or a matching circuit 311c for improving the efficiency between the transmitting coil 311L and the receiving coil 321L.

According to various embodiments, the power transmission circuit 311 may include a power adapter 311a to enable power transmission to at least one wireless power receiving device (eg, a first wireless power receiving device and a second wireless power receiving device); It may include at least one power generating circuit 311b, a transmitting coil 311L, or a matching circuit 311c.

According to various embodiments, the control circuit 312 may perform overall control of the electronic device 101 , and may generate various messages (eg, instructions) required for wireless power transmission and transmit them to the communication circuit 313 . In an embodiment, the control circuit 312 may calculate power (or amount of power) to be transmitted to the wireless power receiver 195 based on the information received from the communication circuit 313 . In an embodiment, the control circuit 312 may control the power transmission circuit 311 to transmit power generated by the transmission coil 311L to the wireless power reception device 195 .

According to various embodiments, the communication circuit 313 may include at least one of a first communication circuit 313a or a second communication circuit 313b. The first communication circuit 313a is connected to the first communication circuit 323a of the wireless power receiving device 195 using, for example, a frequency that is the same as or adjacent to a frequency used for power transmission in the transmitting coil 311L. - It can communicate based on an in-band (IB) communication method.

The first communication circuit 313a may communicate with the first communication circuit 323a of the wireless power receiving apparatus 195 by using the transmission coil 311L. Data (or communication signal) generated by the first communication circuit 313a may be transmitted using the transmission coil 311L. The first communication circuit 313a may transmit data to the wireless power receiver 195 using a frequency shift keying (FSK) modulation technique. According to various embodiments, the first communication circuit 313a communicates with the first communication circuit 323a of the wireless power receiver 195 by changing the frequency of the power signal transmitted through the transmission coil 311L. can do. Alternatively, the first communication circuit 313a may communicate with the first communication circuit 323a of the wireless power receiving apparatus 195 by allowing data to be included in the power signal generated by the power generating circuit 311b. For example, the first communication circuit 313a may perform modulation by increasing or decreasing the frequency of the power transmission signal. The wireless power receiving device 195 may check data from the electronic device 101 by performing demodulation based on the frequency of the signal measured by the receiving coil 321L.

The second communication circuit 313b is, for example, out-of-the-box with the second communication circuit 323b of the wireless power receiving device 195 using a frequency different from the frequency used for power transmission in the transmitting coil 311L. - It can communicate based on an out-of-band (OOB) communication method. For example, the second communication circuit 313b uses any one of various short-distance communication methods such as Bluetooth, Bluetooth low energy (BLE), Wi-Fi, or near field communication (NFC) for second communication. Information related to the state of charge from the circuit 323b (eg, voltage value after rectifier, rectified voltage value (eg, Vrect) information, current information flowing from the coil 321L or the rectifier circuit 321b (eg, Iout), various packets, authentication information and/or messages).

According to various embodiments, the sensing circuit 314 may include at least one or more sensors, and may sense at least one state of the power transmitter 301 using at least one or more sensors.

According to various embodiments, the sensing circuit 314 may include at least one of a temperature sensor, a motion sensor, a magnetic field sensor, or a current (or voltage) sensor, and uses the temperature sensor to 101), it is possible to detect a movement state of the electronic device 101 by using a motion sensor, and detect whether it is coupled to the wireless power receiver 195 using a magnetic field sensor, , a current (or voltage) sensor may be used to detect a state of an output signal of the electronic device 101 , for example, a current level, a voltage level, and/or a power level.

According to an embodiment, the current (or voltage) sensor may measure a signal in the power transmission circuit 311 . The current (or voltage) sensor may measure a signal in at least a portion of the matching circuit 311c or the power generating circuit 311b. For example, the current (or voltage sensor) may include a circuit for measuring a signal at the front end of the coil 311L.

According to various embodiments, the sensing circuit 314 may be a circuit for detecting a foreign object (eg, foreign object detection (FOD)).

According to various embodiments, the wireless power receiver 195 may include a power receiver circuit 321 , a processor 322 , a communication circuit 323 , sensors 324 , a display 325 , or a sensing circuit 326 . may include. The sensors 324 may include a sensing circuit 326 .

According to various embodiments, the power receiving circuit 321 may include a receiving coil 321L that wirelessly receives power from the electronic device 101 , an Rx IC 327 , and a charging circuit 321d (eg, PMIC, DCDC converter). , a switched capacitor, or a voltage divider), or a battery 321e (eg, the battery 189 ). In one embodiment, the Rx IC 327 includes a matching circuit 321a connected to the receiving coil 321L, a rectifying circuit 321b for rectifying the received AC power to DC, or a regulating circuit for adjusting the charging voltage (eg: LDO) 321c.

According to various embodiments, the processor 322 may perform overall control of the wireless power receiving apparatus 195 , and may generate various messages required for wireless power reception and transmit it to the communication circuit 323 .

According to various embodiments, the communication circuit 323 may include at least one of a first communication circuit 323a or a second communication circuit 323b. The first communication circuit 323a may communicate with the electronic device 101 through the receiving coil 321L.

The first communication circuit 323a may communicate with the first communication circuit 313a of the electronic device 101 using the receiving coil 321L. Data (or communication signal) generated by the first communication circuit 323a may be transmitted using the receiving coil 321L. The first communication circuit 323a may transmit data to the electronic device 101 using an amplitude shift keying (ASK) modulation technique. For example, the first communication circuit 323a may cause a change in the load of the electronic device 101 according to a modulation method. Accordingly, at least one of the magnitude of voltage, current, and power measured by the transmission coil 311L may be changed. The first communication circuit 313a of the electronic device 101 may check the data generated by the wireless power receiver 195 by demodulating the change in size. The second communication circuit 323b may communicate with the electronic device 101 using any one of various short-range communication methods such as Bluetooth, BLE, Wi-Fi, or NFC.

In this document, at least one of the first communication circuit 323a or the second communication circuit 323b may be used for packets, information, or data transmitted/received between the electronic device 101 and the wireless power receiver 195 .

According to various embodiments, the sensors 324 may include at least some of a current/voltage sensor, a temperature sensor, an illuminance sensor, or an acceleration sensor. In one embodiment, the sensors 324 may be the same or separate components from the sensor module 1376 of FIG. 13 .

According to various embodiments, the display 325 may display various display information required for wireless power transmission/reception.

According to various embodiments, the sensing circuit 326 may sense the electronic device 101 by sensing a discovery signal or power received from the electronic device 101 . The sensing circuit 326 is a coil 321L generated by a signal output from the electronic device 101. A signal change at the input/output terminal of the coil 321L, the matching circuit 321a, or the rectifying circuit 321b is generated by the signal output from the electronic device 101 . can detect According to various embodiments, the sensing circuit 326 may be included in the receiving circuit 321 .

4 illustrates a level of power input to a transmission coil of an electronic device according to a comparative example for comparison with various embodiments. Those skilled in the art will understand that the operation of the electronic device 101 according to the comparative example of FIG. 4 may also be performed in the electronic device 101 according to the embodiment of the present disclosure.

The electronic device 101 may periodically apply the ping signal 401 to the transmission coil 311L for a duration Δt1. When the application of the ping signal 401 is finished, the power 402 of the transmission coil 311L of the electronic device 101 may be attenuated. For example, the attenuation in the time domain of the envelope of voltage V(t) with respect to power 402 may follow Equation (1).

V(0) may be an initial voltage value, ω may be an angular frequency of an AC signal, and Q may be a Q-factor. Accordingly, the Q-factor may be calculated as in Equation 2 based on the voltages V ₁ and V ₂ corresponding to the two time points t ₁ and t _{2 constituting the envelope.} In Equation 2, T may be a period that is a reciprocal of a frequency.

As described above, the electronic device 101 may perform Q-factor measurement based on the application of the ping signal 401 . The electronic device 101 may store the Q-factor when no foreign material is disposed as a reference. When a foreign material is disposed on the electronic device 101 , the Q-factor may be changed (eg, decreased). When the Q-factor measured later has a difference outside the tolerance range as a result of comparison with the reference, the electronic device 101 may confirm that the wireless power receiver 195 or the foreign material is disposed. Meanwhile, in addition to the Q-factor, the electronic device 101 may detect the arrangement of the wireless power receiver 195 or the foreign material based on a change in the resonant frequency. Those skilled in the art will understand that the operation using the Q-factor described in various embodiments of the present disclosure may be replaced with the operation using the change of the resonant frequency, or the change of the resonant frequency may be additionally considered. The application of the ping signal 401 and the detection phase based on the Q factor and/or frequency may be referred to as a selection phase and a ping phase, and the ping signal 401 is Q-ping can also be named as

If a difference occurs based on the comparison result, the electronic device 101 may apply the digital ping signal 403 . While the digital ping signal 403 is applied, the electronic device 101 may perform at least one operation corresponding to the identification phase and configuration phase with the wireless power receiver 195, and , the corresponding operation may follow, for example, the Qi standard, but there is no limitation. As described above, the electronic device 101 and the wireless power receiver 195 may perform in-band communication. If, while the digital ping signal 403 is applied, the electronic device 101 fails to acquire data from the wireless power receiver 195 (eg, fails to check valid data as a result of demodulation), the electronic device 101 The device 101 may determine that a foreign object is disposed. When the operations in the identification phase and the setting phase are successfully completed, the electronic device 101 may perform at least one operation corresponding to the negotiation phase while applying the power 404, and the corresponding operation may follow the Qi standard for example, but without limitation.

The electronic device 101 may receive a first received power packet RP 1 from the wireless power receiver 195 . Based on the reception of the first received power packet RP 1 , the electronic device 101 may enter a calibration phase. However, according to implementation, the electronic device 101 may receive the first received power packet after entering the calibration step. In addition, although in the example of FIG. 4 , the calibration phase is illustrated as being different from the power transfer phase, this is exemplary and the calibration phase may be understood as a part of the power transfer phase.

The wireless power receiver 195 transmits information on the strength of received power in a plurality of load states (eg, a light load state and a heavy load state) in the calibration step to the electronic device. (101). Here, the load states may be classified based on the level of the current input to the load of the wireless power receiver 195 (or the level of the current output from the rectifier and/or the converter). A state in which the level of current input to the load is relatively small may be referred to as a light state, and a state in which the level of current input to the load is relatively large may be referred to as a weight state, but the names are merely exemplary.

The wireless power receiver 195 may transmit a first received power packet PR 1 including the received power level in the first load state. The wireless power receiving apparatus 195 may check the received power level based on the received power level, and transmit, for example, modulate the first received power packet PR 1 including the received power level. . Here, the received power level may be, for example, a value according to the Qi standard, a received power value, or an estimated received power value. The received power level, for example, performs processing (eg, processing defined in the Qi standard) on the measured (or predicted) power level (eg, W unit) by the wireless power receiving device 195 . It may be obtained as a result, but there is no limitation, and it may be implemented with the measured (or predicted) power level itself.

The first received power packet RP 1 is to indicate a first calibration data point, and a received power level included in the first received power packet RP 1 is a power transfer contract. ) may be 10% or less of the reference power level included in the . The first received power packet may have, for example, a type value of “1” (eg, 001), and the electronic device 101 receives the first received power packet RP 1 based on the type value of “1”. You can confirm that this has been received.

The electronic device 101 may receive the second received power packet RP 2 from the wireless power receiving device 195 while the power 405 is being applied. The wireless power receiver 195 may transmit a second received power packet RP 1 including the received power level in the second load state. The second received power packet RP 2 may be for indicating a second calibration data point (or a subsequent data point), and may be a value close to the reference power level included in the power transmission contract. The second received power packet may have, for example, a type value of “2”, and the electronic device 101 may generate a second received power packet RP 1 based on a type value of “2” (eg, 010). You can confirm that this has been received.

) 및 수신 전력 레벨(

)을 확인할 수 있으며, 제 2 로드 상태(예: 연결된 로드 상태)에서의 송신 전력 레벨(

) 및 수신 전력 레벨(

)을 확인할 수 있다. 전자 장치(101)는, 인터폴레이션에 기반한 기울기(a)를 수학식 3과 같이 확인할 수 있으며, 절편(b)을 수학식 4와 같이 확인할 수 있다.The electronic device 101 may calculate a parameter based on values of two calibration data points. Meanwhile, the two calibration data points are merely exemplary, and the number is not limited. For example, the electronic device 101 has a transmit power level (

) and the received power level (

) can be checked, and the transmit power level (

) and the received power level (

)can confirm. The electronic device 101 may determine the slope (a) based on the interpolation as in Equation 3, and may determine the intercept (b) as in Equation 4.

After checking the parameters, the electronic device 101 may enter a power transfer phase to apply power 406 for charging. The wireless power receiver 195 may _{check the transmitted} power P transmitted in the power transmission step, and may correct it as in Equation 5 to obtain the calibrated power P _calibrated .

In addition, the electronic device 101 may check the power _loss P loss based on Equation (6).

_{P received} in Equation 6 may be a reception power level in the wireless power receiving device 195 confirmed based on in-band communication from the power receiving device 195 . The electronic device 101 may determine whether foreign matter is disposed during power transmission based on whether the _{power loss P loss is equal to or greater than a preset reference value.} Alternatively, the electronic device 101 may perform a correction on the strength of the received power and calculate the lost power using the result of the performance. However, when the validity of the parameters (eg, a, b) is ensured, accurate detection of the arrangement of the foreign material can be ensured. If a foreign material is disposed before entering the calibration step or during the calibration step, parameters (eg, a, b) may have inaccurate values. Accordingly, verification of at least one parameter calculated according to the calibration is required.

Meanwhile, a method of acquiring parameters (eg, a, b) for a linear model based on the above-described two calibration data is merely exemplary. The electronic device 101 according to another embodiment may process (eg, interpolate) a plurality of calibration data to check a calibration curve. The electronic device 101 may check an effective FOD threshold from the calibration curve. The electronic device 101 may detect a foreign material based on whether a result of subtracting the received power level from the transmitted power level is greater than an effective foreign material detection threshold.

The electronic device 101, the power 406 for charging in a power transfer phase, the received power level included in the received power packet (eg, RP 0), and at least one parameter Based on the , it is possible to determine whether the foreign matter is disposed during the power transmission step. However, for example, when a foreign material is placed before or during the calibration step, at least one parameter may not be valid, which may cause deterioration of the foreign material placement detection accuracy.

5A is a flowchart illustrating a method of operating an electronic device according to various embodiments of the present disclosure; The embodiment of FIG. 5A will be described with reference to FIG. 5B. 5B is a graph illustrating a level of transmitted power of an electronic device according to various embodiments of the present disclosure;

According to various embodiments, in operation 501 , the electronic device 101 (eg, the control circuit 312 ) transmits the first power (eg, the power 531 of FIG. 5B ) to a coil (eg, the transmission coil) 311L), etc. For example, the electronic device 101 may apply the first power 531 in the negotiation phase, but there is no limitation on the transmission time point. The 101 may also perform operations to be described later in the re-calibration step, and in this case, the electronic device 101 may perform the designated first power in a possible step prior to the re-calibration step. 531 may be applied, for example, the first power 531 may be power according to the negotiation stage in one example, but may also be power according to various other stages.

According to various embodiments, in operation 503 , the electronic device 101 stops the application of the first power 531 and prevents power from being applied to the coil for a first period (eg, Δt1 in FIG. 5B ). can be controlled In one example, the electronic device 101 may control not to apply power to the coil during the first period Δt1 based on a request from the wireless power receiver 195 . For example, the wireless power receiving device 195 is based on the state of the wireless power receiving device 195 (eg, the voltage and/or load current of the output terminal of the rectifier of the wireless power receiving device 195), The first period Δt1 may be determined, and details thereof will be described later. The wireless power receiver 195 may transmit a data packet including the determined first period Δt1. The electronic device 101 may stop applying power during the first period Δt1 requested from the wireless power receiving device 195 . Interruption of application of power here may be performed, for example, based on the control of the power adapter 311a and/or the power generation circuit 311b. As another example, the electronic device 101 may determine the first period Δt1. For example, the electronic device 101 may stop the application of power during the first predetermined period Δt1. For example, the electronic device 101 may determine the first period Δt1 based on the level of the power received from the wireless power receiving device 195 and/or the level of the load current, and the determination method thereof There is no limit to

According to various embodiments, in operation 505 , the electronic device 101 may check the first Q-factor for the first period Δt1. As shown in FIG. 5B , when the application of the first power 531 is stopped, the power 532 may have a decreasing waveform. Meanwhile, it will be understood by those skilled in the art that FIG. 5B is for convenience of description, and the power 532 may correspond to, for example, an envelope. The electronic device 101 may identify the first Q-factor for the first period Δt1 based on the attenuation of the envelope of the power 532 . For example, the electronic device 101 may identify the first Q-factor based on a plurality of data (eg, a plurality of voltages) during the first period Δt1 based on Equation 2 However, there is no limitation on the verification method. In various embodiments, the electronic device 101 checks the first Q-factor based on the remaining lobes except for the first specified number of lobes among the plurality of lobes during the first period Δt1. may be set, but this is exemplary and there is no limitation on data for confirming the first Q-factor.

According to various embodiments, after the first period Δt1 , in operation 507 , the electronic device 101 may apply at least one power (eg, 533 of FIG. 5B ) for a calibration operation. Although at least one power 533 is illustrated as having a constant level in FIG. 5B , this is exemplary and those skilled in the art will understand that the level of the power 533 may be changed during calibration. In operation 509 , the electronic device 101 may stop application of the last power according to the calibration operation and control not to apply power to the coil for a second period (eg, Δt2 in FIG. 5B ). In FIG. 5B , at least one power 533 for the calibration operation is shown as a constant level, but if the level of the power 533 is changed, after the last power is applied in the order of time, the electronic device 101 may stop applying power during the second period Δt2. Similar to stopping the application of power for the first period Δt1 , the electronic device 101 stops the application of power for the second period Δt2 based on reception of a data packet including the second period Δt2 can do. Alternatively, the electronic device 101 may check the second period Δt2 by itself. The second period Δt2 may be different from the first period Δt1, but may be set to be the same.

According to various embodiments, in operation 511 , the electronic device 101 may check the second Q-factor for the second period Δt2 . The checking method of the second Q-factor may be the same as the checking method of the first Q-factor. In operation 513 , the electronic device 101 may check the validity of the parameter checked based on the calibration operation based on the first Q-factor and the second Q-factor. For example, the electronic device 101 determines, based on the calibration operation, at least one parameter such as a parameter for correction (eg, a, b) and/or an effective FOD threshold. can be checked

In one example, the electronic device 101 may determine the validity of the parameter based on a comparison result between the first Q-factor and the second Q-factor. If a foreign material is disposed on the electronic device 101 while calibration is being performed, a difference between the first Q-factor and the second Q-factor may be identified as greater than or equal to a threshold difference. As described above, the disposition of the foreign material affects the Q-factor, and accordingly, the second Q-factor may be changed compared to the first Q-factor. The electronic device 101 may determine that the parameter is invalid based on the difference being equal to or greater than the threshold difference. The electronic device 101 may determine that a foreign material is additionally disposed. When the difference is less than the threshold difference, the electronic device 101 may determine that the parameter is valid.

In another example, the electronic device 101 stores, as a reference, a Q-factor measured based on a Q-ping signal (eg, the ping signal 401 ) when the wireless power receiver 195 is initially deployed. can The electronic device 101 may check the validity of the parameter based on the comparison result between the reference and the first Q-factor and/or the comparison result between the reference and the second Q-factor. For example, if a foreign material is disposed between after the electronic device 101 detects the arrangement of the wireless power receiver 195 and before the application of the first power 531 is stopped, the reference and the first Q-factor may be greater than or equal to the threshold difference. For example, if a foreign object is placed while calibration is being performed, the difference between the reference and the second Q-factor may be greater than or equal to the threshold difference. The electronic device 101 may determine that the parameter is invalid when it is determined that the foreign material is disposed based on the at least one comparison result.

According to the above, the parameter whose validity is not guaranteed can be discarded, and the deterioration of the foreign material detection accuracy in the power transfer phase can be prevented.

6 is a flowchart illustrating a method of operating an electronic device according to various embodiments of the present disclosure; For the operation that has already been described in detail, the description will be simplified.

According to various embodiments, the electronic device 101 (eg, the control circuit 312 ) may identify the first Q-factor in operation 601 . For example, the electronic device 101 may stop the application of the previously applied power and check the first Q-factor. In operation 603 , the electronic device 101 may perform a calibration operation. In operation 605 , the electronic device 101 may identify the second Q-factor. For example, the electronic device 101 may stop applying the last power and check the second Q-factor in a state in which the last power is temporally applied among at least one power associated with the calibration operation. In operation 607 , the electronic device 101 may determine whether a parameter identified based on the calibration operation is valid based on the first Q-factor and the second Q-factor. For example, the electronic device 101 may determine whether the identified parameter is valid based on a comparison result of the first Q-factor and the second Q-factor. When the difference between the first Q-factor and the second Q-factor is equal to or greater than the threshold difference, the electronic device 101 may determine that the identified parameter is invalid. When the difference between the first Q-factor and the second Q-factor is less than the threshold difference, the electronic device 101 may determine that the checked parameter is valid. For example, the electronic device 101 may determine whether the parameter is valid based on a result of comparing the first Q-factor and the second Q-factor with the reference.

According to various embodiments, if it is determined that the parameter checked based on the calibration operation is valid (607-Yes), the electronic device 101 detects a foreign object during the power transmission operation based on the checked parameter in operation 609 . can For example, when the electronic device 101 checks a parameter (eg, a, b) for correcting the level of the transmitted power or the level of the received power, the electronic device 101 determines the level of the transmitted power. Either the level or the level of the received power may be corrected based on the parameter. The electronic device 101 may determine whether the foreign material is disposed based on the difference between the corrected level and the remaining levels. For example, the electronic device 101 . When the effective FOD detection threshold is checked as a result of the calibration, the electronic device 101 determines whether the foreign material is disposed based on whether the difference between the level of the transmitted power and the level of the received power is equal to or greater than the effective FOD detection threshold. You may decide whether or not

According to various embodiments, if it is determined that the parameter checked based on the calibration operation is invalid ( 607 - NO), the electronic device 101 may determine that a foreign material is detected in operation 611 . The electronic device 101 may perform an operation corresponding to the detection of foreign substances. In addition, the electronic device 101 may discard the parameter identified based on the calibration operation and perform the calibration operation again later. For example, the electronic device 101 may perform a calibration operation again after it is determined that the foreign material is collected.

7 is a graph illustrating a level of transmitted power of an electronic device according to various embodiments of the present disclosure;

According to various embodiments, the electronic device 101 (eg, the control circuit 312 ) may periodically apply the ping signal 701 to the transmission coil 311L for a duration Δt1 . The application of the ping signal 701 and other powers may be performed, for example, based on the control of the power adapter 311a and/or the power generation circuit 311b. When the application of the ping signal 701 is finished, the power 702 of the transmission coil 311L of the electronic device 101 may be attenuated. Based on the attenuation of the power 702 , the electronic device 101 may check the Q-factor. The electronic device 101 may determine the arrangement of the wireless power receiver 195 or the foreign material based on a comparison between the reference, which is a Q-factor when the foreign material is not disposed, and the confirmed Q-factor.

If a difference occurs based on the comparison result, the electronic device 101 may apply the digital ping signal 703 . While the digital ping signal 703 is applied, the electronic device 101 may perform at least one operation corresponding to an identification phase and a configuration phase with the wireless power receiver 195 . . When the operations in the identification phase and the setting phase are successfully completed, the electronic device 101 may perform at least one operation corresponding to the negotiation phase while applying the power 704 .

According to various embodiments, the wireless power receiver 195 may enter (or maintain) a first load state (eg, min load power). The wireless power receiver 195 may check the received power level in the first load state. The wireless power receiving device 195 may check the power application interruption period (eg, Δt2). Confirmation of the power application interruption period (eg, Δt2) of the wireless power receiver 195 will be described later. The wireless power receiving device 195 may transmit the first received power packet PR 1 including the received power level and the power application interruption period (eg, Δt2 ) to the electronic device 101 .

According to various embodiments, the electronic device 101 may receive the first received power packet PR 1 . The electronic device 101 may check and store the data included in the first received power packet PR 1 and the level of the power 704 as the first calibration data point. If the first calibration data point is accepted, the electronic device 101 may transmit an acknowledgment (ACK) packet to the electronic device 101 .

According to various embodiments, the electronic device 101 may stop applying power during a power application stop period (eg, Δt2 ) included in the first received power packet PR 1 . When the application of the power 704 is finished, the power 705 of the transmission coil 311L of the electronic device 101 may be attenuated. Based on the attenuation of the power 705 , the electronic device 101 may identify the first Q-factor.

According to various embodiments, the wireless power receiver 195 may enter a second load state (eg, medium load power). While the wireless power receiving device 195 enters the second load state, power 706 may be applied to the transmitting coil 311L of the electronic device 101 . For example, as the load state of the wireless power receiving device 195 is changed, the level of the power 706 applied to the transmitting coil 311L of the electronic device 101 may be changed, and/or the electronic device 101 may change the level of power 706 compared to existing power 704 . The wireless power receiver 195 may check the received power level in the second load state. The wireless power receiving apparatus 195 may check a power application interruption period (eg, Δt3). The wireless power receiving device 195 may transmit the first received power packet PR 1 including the received power level and the power application interruption period (eg, Δt3 ) to the electronic device 101 . On the other hand, there is no limitation on the type of data packet, and may be replaced with the second received power packet PR 2 .

According to various embodiments, the electronic device 101 may receive the first received power packet PR 1 . The electronic device 101 may check and store the data included in the first received power packet PR 1 and the level of the power 706 as the second calibration data point.

According to various embodiments, the electronic device 101 may stop applying the power 706 during a power application stop period (eg, Δt3 ) included in the first received power packet PR 1 . When the application of the power 706 is finished, the power 707 of the transmission coil 311L of the electronic device 101 may be attenuated. Based on the attenuation of the power 707 , the electronic device 101 may identify the second Q-factor. Meanwhile, in another embodiment, the Q-factor check may be optional at points other than the start point and the end point of the calibration. The wireless power receiving device 195 may not request the electronic device 101 to stop applying power. In this case, the data packet transmitted by the wireless power receiving apparatus 195 may include only the received power level, or the power application interruption period may be set to zero.

According to various embodiments, the wireless power receiver 195 may enter a third load state (eg, max load power). While the wireless power receiving device 195 enters the third load state, power 708 may be applied to the transmitting coil 311L of the electronic device 101 . For example, as the load state of the wireless power receiving device 195 is changed, the level of the power 708 applied to the transmitting coil 311L of the electronic device 101 may be changed, and/or the electronic device 101 may change the level of power 708 compared to an existing power 706 . The wireless power receiver 195 may check the received power level in the third load state. The wireless power receiving apparatus 195 may check a power application interruption period (eg, Δt4). The wireless power receiving device 195 may transmit the second received power packet PR 2 including the received power level and the power application interruption period (eg, Δt4) to the electronic device 101 . On the other hand, there is no limitation on the type of data packet, and may be replaced with the first received power packet PR 1 .

According to various embodiments, the electronic device 101 may receive the second received power packet PR 2 . The electronic device 101 may check and store the data included in the second received power packet PR 2 and the level of the power 708 as the third calibration data point.

According to various embodiments, the electronic device 101 may stop the application of the power 708 during a power application interruption period (eg, Δt4) included in the second received power packet PR 2 . When the application of the power 708 is finished, the power 709 of the transmission coil 311L of the electronic device 101 may be attenuated. Based on the attenuation of the power 709 , the electronic device 101 may identify the third Q-factor.

According to various embodiments, the electronic device 101 may identify at least one parameter based on the first calibration data point, the second calibration data point, and the third calibration data point. The electronic device 101 may determine whether at least one parameter is valid based on the first Q-factor, the second Q-factor, and the third Q-factor. If it is determined that the at least one parameter is valid, the electronic device 101 may perform a foreign material detection operation using the at least one parameter while transmitting the power 710 for charging. The electronic device 101 determines whether a foreign material is disposed based on the transmitted power 710 , the level of the received power included in the data packet (eg, RP 0) checked through communication, and at least a parameter can do.

According to various embodiments, when it is determined that the foreign material is not disposed, the electronic device 101 may transmit an ACK packet in the RP 1 packet or the RP 2 packet. If the arrangement of the foreign material is determined, the electronic device 101 may transmit a negative acknowledgment (NAK) packet. If it is not determined, the electronic device 101 may transmit an ND response.

8 is a diagram for explaining operations of an electronic device and an apparatus for receiving wireless power according to various embodiments of the present disclosure;

According to various embodiments, the electronic device 101 (eg, the control circuit 312 ) may apply the first power to the transmission coil 311L in operation 801 . In operation 803 , the wireless power receiving apparatus 195 (eg, the processor 322 ) may check the first received power level in the first load state. In operation 805 , the wireless power receiving apparatus 195 may transmit a first packet including a first received power level and a first period. On the other hand, it is exemplary that the received power level and the period for requesting power interruption are included in one data packet. You may. The transmission operation in FIG. 8 may be modulation corresponding to the first packet of the wireless power receiving apparatus 195 . In operation 807 , the electronic device 101 stops power transmission for the first period, and analyzes the attenuation in the transmission coil 311L during the stopped first period to determine the first Q-factor.

According to various embodiments, the electronic device 101 (eg, the control circuit 312 ) may apply the Nth power to the transmission coil 311L in operation 809 . The Nth power may be different from or the same as the first power. In operation 811 , the wireless power receiving apparatus 195 (eg, the processor 322 ) may check the Nth received power level in the Nth load state. In operation 813 , the wireless power receiving apparatus 195 may transmit an Nth packet including an Nth received power level and an Nth period. In operation 815 , the electronic device 101 may stop power transmission for the N-th period, and analyze the attenuation in the transmission coil 311L during the stopped N-th period to determine the N-th Q-factor. Here, N may be a natural number of 2 or more. When N is 3 or more, the electronic device 101 and the wireless power receiving device 195 further perform N-2 (not shown) reception power level check, packet transmission, power transmission stop, and Q-factor check. can do. Meanwhile, in the first operation and intermediate operations other than the last operation, stopping power transmission and checking the Q-factor may be omitted.

According to various embodiments, in operation 817 , the electronic device 101 may identify at least one parameter based on the first to Nth power and the first to Nth received power levels. In operation 819 , the electronic device 101 may verify the validity of at least one parameter based on the first to Nth Q-factors.

9A shows the structure of a data packet according to a comparative example for comparison with various embodiments.

The wireless power receiver 195 according to the comparative example may transmit the RP 1 packet having the structure of FIG. 9A to the electronic device 101 . The RP 1 packet may be based on, for example, a 24-bit received power packet defined in the Qi standard. The RP 1 packet may include a reserved field 901 , a mode field 902 , and an estimated received power value field 903 . The estimated received power value field 903 or 915 may be named as a received power value according to a version of the standard. The bit string represented in the mode field 902 or 914 may provide additional information about the received power value. For example, "1" (001) in the mode field 902 may indicate a first load state, and "2" (010) may indicate a second load state. The predicted received power value is a value obtained by processing the level of received power measured by the wireless power receiving device 195 , and may be, for example, one of the above-described received power levels, and is used as a calibration data point. can be

9B illustrates a structure of a packet RP 1 of received power transmitted by the wireless power receiving apparatus 195 according to various embodiments of the present disclosure. The wireless power receiver 195 may include the slot time 913 in the data packet by using some of the existing reserved fields 901 . The slot time 913 may have, for example, a value of 0 to 8, of which 0 may indicate that the power application interruption period is 0. When the slot time 913 is 0, the electronic device 101 may skip power interruption and Q-factor measurement. Each of the values may be matched to a power application interruption period. For example, 1 may represent 80 μs, 2 may represent 100 μs, 3 may represent 120 μs, etc., but this is illustrative and not limited. When the slot time 913 is a non-zero value, the electronic device 101 may stop applying power and measure the Q-factor for a corresponding period.

The wireless power receiver 195 may include a settling time 912 in the data packet by using some of the existing reserved fields 901 . The settling time 912 may mean an interval between power slots when a plurality of power slots (ie, stopping power application and measuring a Q-factor) are used in succession. After the voltage Vrect of the output terminal of the rectifier of the wireless power receiver 195 is dropped by the power slot, it may take time to recover. When the settling time 912 is not sufficient, the voltage Vrect at the output terminal of the rectifier does not recover and drops, so that in-band communication may be cut off. For example, the settling time 912 may have a value of 0 to 3, of which 0 may indicate that the settling time is 0. Each value may be matched to settling times. For example, 1 may represent 50 ms, 2 may represent 100 ms, 3 may represent 150 ms, etc., but this is illustrative and not limited. When the settling time 912 is a non-zero value, the electronic device 101 may wait for stopping power application for a corresponding period. For example, after receiving an arbitrary PR/x packet (eg, PR 1 or PR 2 ), the electronic device 101 receives a response (eg, ACK packet) after the included settling time 912 . ) can be sent.

According to various embodiments, the wireless power receiver 195 may check version information (eg, an ID packet version) of the electronic device 101 . When the power slot function is not supported based on the version information of the electronic device 101 , the electronic device 101 sets the settling time 912 and the slot time 913 to 0 to transmit the data packet. may be

10 is a flowchart illustrating an operating method of an apparatus for receiving power wirelessly according to various embodiments of the present disclosure. FIG. 10 will be described with reference to FIGS. 11A to 11F. 11A-11F illustrate a receive peak voltage and an output voltage of a rectifier in accordance with various embodiments.

According to various embodiments, the wireless power receiving apparatus 195 (eg, the processor 322 ) may check the level of the received power and/or the level of the load current in operation 1001 . The wireless power receiving apparatus 195 may check, for example, the voltage Vrect of the output terminal of the rectifier as the received power level, but there is no limitation on a position where the received power level is defined. The wireless power receiver 195 may check a current input to a load (eg, a charger or a power management integrated circuit (PMIC)) as a load current, for example, but a position where the load current is defined There is no limit to

According to various embodiments, in operation 1003 , the wireless power receiver 195 may determine the power transmission interruption period based on the level of the received power and/or the level of the load current. . Referring to FIG. 11A , in the first load state, the load current of the wireless power receiver 195 may be, for example, 200 mA, and the initial value of the output voltage of the rectifier may be 5.5V. When the electronic device 101 stops providing power, it can be seen that the reception peak voltage 1101 drops and the output voltage 1102 of the rectifier also drops. However, the output voltage 1102 of the rectifier may be higher than or equal to the threshold voltage (UVLO, under voltage lock out) (eg, 3.3V) 1103 even after 160 μs. The threshold voltage 1103 may be, for example, a value set so that in-band communication is not cut off. However, referring to FIG. 11B , in the second load state, the load current of the wireless power receiver 195 is, for example, 350 mA, and the initial value of the output voltage of the rectifier may be 5.2V. When the electronic device 101 stops providing power, it can be seen that the reception peak voltage 1111 drops and the output voltage 1112 of the rectifier also drops. In this case, it can be seen that the output voltage 1112 of the rectifier drops below the threshold voltage (3.3V) 1103 at 120 μs. For example, referring to FIGS. 11A and 11B , it can be seen that the drop speed of the output voltage of the rectifier is relatively fast in a load state with a large load current. In addition, as the output voltage of the first rectifier increases, the time to drop below the threshold voltage 1103 may increase. Accordingly, the wireless power receiving apparatus 195 may determine the power application interruption period based on the output voltage and/or the load current of the rectifier. The power application interruption period needs to be set so that the output voltage of the rectifier does not drop below the threshold voltage 1103 . For example, the wireless power receiving apparatus 195 may calculate a power application interruption period using an output voltage and/or a load current of the rectifier. Alternatively, the wireless power receiving apparatus 195 may check the power application interruption period by referring to a pre-stored lookup table. In the case of FIG. 11B , the wireless power receiving apparatus 195 may determine a period shorter than 120 μs as the power application interruption period. Referring to FIG. 11C , in the first load state, the load current of the wireless power receiver 195 may be, for example, 200 mA, and the initial value of the output voltage of the rectifier may be 8.0V. When the electronic device 101 stops providing power, it can be seen that the reception peak voltage 1121 drops and the output voltage 1122 of the rectifier also drops. However, the output voltage 1122 of the rectifier may be above the threshold voltage (3.3V) 1103 even after 160 μs. Referring to FIG. 11D , in the second load state, the load current of the wireless power receiver 195 may be, for example, 700 mA, and the initial value of the output voltage of the rectifier may be 7.7V. When the electronic device 101 stops providing power, it can be seen that the reception peak voltage 1131 drops and the output voltage 1132 of the rectifier also drops. In this case, it can be seen that the output voltage 1132 of the rectifier drops below the threshold voltage (3.3V) 1103 at 120 μs. In the embodiment of FIG. 11D , the wireless power receiving apparatus 195 may determine a period shorter than 120 μs as the power application interruption period. Referring to FIG. 11E , in the first load state, the load current of the wireless power receiver 195 may be, for example, 200 mA, and the initial value of the output voltage of the rectifier may be 19.5V. When the electronic device 101 stops providing power, it can be seen that the reception peak voltage 1141 drops and the output voltage 1142 of the rectifier also drops. However, the output voltage 1142 of the rectifier may be above the threshold voltage (3.3V) 1103 even after 160 μs. Referring to FIG. 11F , in the second load state, the load current of the wireless power receiver 195 may be, for example, 1150 mA, and the initial value of the output voltage of the rectifier may be 19.2V. When the electronic device 101 stops providing power, it can be seen that the reception peak voltage 1151 drops while the output voltage 1152 of the rectifier drops. In this case, it can be seen that the output voltage 1152 of the rectifier drops below the threshold voltage (3.3V) 1103 at 120 μs. In the embodiment of FIG. 11F , the wireless power receiving apparatus 195 may determine a period shorter than 120 μs as the power application interruption period.

According to various embodiments, the wireless power receiving apparatus 195 may transmit a data packet including the checked power transmission interruption period in operation 1005 . As described above, the slot time included in the data packet may be set differently for each load state. Accordingly, disconnection of the in-band communication connection due to Q-factor measurement based on interruption of power application may be prevented.

According to various embodiments, the apparatus 195 for receiving power wirelessly may determine the settling time based on the level of the received power and/or the level of the load current. As described above, the wireless power receiver 195 may estimate the output voltage of the rectifier after the power supply is stopped, based on the output voltage and the load current of the initial rectifier. In addition, the rate of increase of the output voltage of the rectifier after being supplied to the power again may be predictable. The wireless power receiver 195 may check the settling time by again predicting (or referencing) the time it takes for the output voltage of the rectifier to recover to a predetermined level. The wireless power receiver 195 may include the checked settling time in the received power packet and transmit it to the electronic device 101 . As described above, the electronic device 101 checks the settling time included in the received power packet, and determines when the received power packet is received (or when the application of power is stopped, or when the power is applied) After the settling time has elapsed from the time of resumption), a response (eg, an ACK packet) may be transmitted.

12 is a flowchart illustrating a method of operating an apparatus for receiving power wirelessly according to various embodiments of the present disclosure.

According to various embodiments, the wireless power receiving apparatus 195 (eg, the processor 322 ) may check the level of the received power and/or the level of the load current in operation 1201 . In operation 1203 , the wireless power receiving apparatus 195 may check the power transmission interruption period based on the level of the received power and/or the level of the load current. In operation 1205, the wireless power receiving apparatus 195 may determine whether the level of the received power is in a stable state. When the level of the received power is not stable (1205-No), the electronic device 101 may check the level of the received power and/or the load current and check the power transmission interruption period corresponding thereto again. Alternatively, the electronic device 101 may store the checked power transmission interruption period without additionally checking the power transmission interruption period again. In one example, the wireless power receiving device 195 may determine whether the level of the received power is in a stable state, based on whether the level of the received power, for example, the level of the output voltage of the rectifier is equal to or greater than the threshold voltage. can As described above, when the electronic device 101 stops applying power during the slot time, the output voltage of the rectifier of the wireless power receiver 195 may drop. Thereafter, when the electronic device 101 resumes application of power, the output voltage of the rectifier of the wireless power receiver 195 may rise again. The electronic device 101 may wait until the output voltage of the rectifier rises above the threshold voltage. If the electronic device 101 additionally stops applying power when the output voltage of the rectifier does not rise above the threshold voltage, in-band communication may be cut off according to a drop in the output voltage of the rectifier. Accordingly, the electronic device 101 may refrain from transmitting the data packet until the output voltage of the rectifier is restored to the threshold voltage or higher. When the received power level is in a stable state (1205-Yes), the wireless power receiving device 195 may transmit a data packet including the checked power transmission interruption period to the electronic device 101 in operation 1207 . . The electronic device 101 may check the power transmission interruption period from the received data packet, stop applying power during the checked power transmission interruption period, and check the Q-factor.

For example, the wireless power receiving device 195 may transmit a data packet requesting to stop applying power when the electronic device 101, which is the counterpart device, supports the functions of stopping power application and measuring Q-factor. have. For example, the electronic device 101 may not support stopping power application and measuring Q-factor if it conforms to at least one first version of the Qi standard (eg, version 1.2.4 or lower), At least one second version of the Qi standard (eg, version 1.3 or higher) may support power-on interruption and Q-factor measurement. The wireless power receiver 195 may determine whether the electronic device 101 supports the functions of stopping power application and measuring the Q-factor based on, for example, the ID packet version. For example, the wireless power receiver 195 determines whether the electronic device 101 supports the functions of stopping power application and measuring the Q-factor based on the NEG field of the configuration packet (or CFG packet). can be judged For example, when the value of the NEG field is 0, it may be determined that the electronic device 101 supports the functions of stopping power application and measuring the Q-factor. For example, the wireless power receiving device 195 may determine whether the electronic device 101 supports the functions of stopping power application and measuring the Q-factor based on the ND response from the electronic device 101 . have. For example, when the ND response is checked according to the GRQ/x packet, it may be determined that the electronic device 101 supports the functions of stopping power application and measuring the Q-factor. For example, while conforming to Qi 1.3 or higher version, the electronic device 101 supporting the extended power profile (EPP) mode may support the functions of stopping power application and measuring the Q-factor, and the method of checking the information includes: no limits. If it is determined that the electronic device 101 does not support the functions of stopping power application and measuring the Q-factor, the electronic device 101 and the wireless power receiving device 195 perform the BPP (baseline) mode rather than the EPP mode. power profile) mode may be set to enter.

For example, according to version 1.3, the wireless power receiving device 195 supporting the EPP mode is a CFG/bp packet (eg, NEG bit is null, other fields are set by the value of CFG/ep) By transmitting , it can be set to start operation from the BPP mode at the start time. For example, according to version 1.3, when the electronic device 101 supporting the EPP mode receives a CFG/bp packet and a precedent ID packet having a version field of version 1.3 or higher from the wireless power receiver 195, CFG An ND response can be sent in response to the /bp packet. For example, according to version 1.3, the wireless power receiver 195 supporting the EPP mode enters the EPP mode based on reception of the ND response corresponding to the CFG/bp, and transmits the GRQ/id packet. can

For example, according to version 1.3, the electronic device 101 supporting the EPP mode may enter the EPP mode based on reception of the precedent ID packet and GRQ/id of the version field 1.3 or higher. Thereafter, according to version 1.3, the electronic device 101 supporting the EPP mode provides an XCAP data packet, a CAP data packet, and a TX ID data packet in the slot length field for PRx GRQ/id, /cap and /xcap data packets. can be sent. When the wireless power receiver 195 confirms that the value of the slot length field is 0, it does not transmit the RP 1 packet and the RP 2 packet, and may operate at, for example, 5W or less. For example, when the wireless power receiver 195 checks a value of a slot length field other than 0, it may skip initial calibration and authenticate the electronic device 101 . The wireless power receiver 195 may authenticate the electronic device 101 and, if necessary, select a new operating voltage. Thereafter, the wireless power receiver 195 and the electronic device 101 may perform calibration accompanied by Q-factor measurement.

Hereinafter, the electronic device 1301 that may be implemented as the electronic device 101 and/or the wireless power receiver 195 according to various embodiments will be described.

13 is a block diagram of an electronic device 1301 in a network environment 1300, according to various embodiments. Referring to FIG. 13 , in a network environment 1300 , the electronic device 1301 communicates with the electronic device 1302 through a first network 1398 (eg, a short-range wireless communication network) or a second network 1399 . It may communicate with the electronic device 1304 or the server 1308 through (eg, a long-distance wireless communication network). According to an embodiment, the electronic device 1301 may communicate with the electronic device 1304 through the server 1308 . According to an embodiment, the electronic device 1301 includes a processor 1320 , a memory 1330 , an input module 1350 , a sound output module 1355 , a display module 1360 , an audio module 1370 , and a sensor module ( 1376), interface 1377, connection terminal 1378, haptic module 1379, camera module 1380, power management module 1388, battery 1389, communication module 1390, subscriber identification module 1396 , or an antenna module 1397 . In some embodiments, at least one of these components (eg, the connection terminal 1378 ) may be omitted or one or more other components may be added to the electronic device 1301 . In some embodiments, some of these components (eg, sensor module 1376 , camera module 1380 , or antenna module 1397 ) are integrated into one component (eg, display module 1360 ). can be

The processor 1320, for example, executes software (eg, a program 1340 ) to execute at least one other component (eg, a hardware or software component) of the electronic device 1301 connected to the processor 1320 . It can control and perform various data processing or operations. According to one embodiment, as at least part of data processing or computation, the processor 1320 converts commands or data received from other components (eg, the sensor module 1376 or the communication module 1390 ) to the volatile memory 1332 . , process the command or data stored in the volatile memory 1332 , and store the result data in the non-volatile memory 1334 . According to an embodiment, the processor 1320 is the main processor 1321 (eg, a central processing unit or an application processor) or a secondary processor 1323 (eg, a graphic processing unit, a neural network processing unit) a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor). For example, when the electronic device 1301 includes a main processor 1321 and a sub-processor 1323 , the sub-processor 1323 uses less power than the main processor 1321 or is set to be specialized for a specified function. can The coprocessor 1323 may be implemented separately from or as part of the main processor 1321 .

The co-processor 1323 may be, for example, on behalf of the main processor 1321 while the main processor 1321 is in an inactive (eg, sleep) state, or the main processor 1321 is active (eg, executing an application). ), together with the main processor 1321, at least one of the components of the electronic device 1301 (eg, the display module 1360, the sensor module 1376, or the communication module 1390) It is possible to control at least some of the related functions or states. According to one embodiment, the coprocessor 1323 (eg, image signal processor or communication processor) may be implemented as part of another functionally related component (eg, camera module 1380 or communication module 1390). have. According to an embodiment, the auxiliary processor 1323 (eg, a neural network processing unit) may include a hardware structure specialized for processing an artificial intelligence model. Artificial intelligence models can be created through machine learning. Such learning may be performed, for example, in the electronic device 1301 itself on which artificial intelligence is performed, or may be performed through a separate server (eg, the server 1308). The learning algorithm may include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but in the above example not limited The artificial intelligence model may include a plurality of artificial neural network layers. Artificial neural networks include deep neural networks (DNNs), convolutional neural networks (CNNs), recurrent neural networks (RNNs), restricted boltzmann machines (RBMs), deep belief networks (DBNs), bidirectional recurrent deep neural networks (BRDNNs), It may be one of deep Q-networks or a combination of two or more of the above, but is not limited to the above example. The AI model may include, in addition to, or alternatively, a software structure in addition to the hardware structure.

The memory 1330 may store various data used by at least one component of the electronic device 1301 (eg, the processor 1320 or the sensor module 1376 ). The data may include, for example, input data or output data for software (eg, the program 1340 ) and commands related thereto. The memory 1330 may include a volatile memory 1332 or a non-volatile memory 1334 .

The program 1340 may be stored as software in the memory 1330 , and may include, for example, an operating system 1342 , middleware 1344 , or an application 1346 .

The input module 1350 may receive a command or data to be used by a component (eg, the processor 1320 ) of the electronic device 1301 from the outside (eg, a user) of the electronic device 1301 . The input module 1350 may include, for example, a microphone, a mouse, a keyboard, a key (eg, a button), or a digital pen (eg, a stylus pen).

The sound output module 1355 may output a sound signal to the outside of the electronic device 1301 . The sound output module 1355 may include, for example, a speaker or a receiver. The speaker can be used for general purposes such as multimedia playback or recording playback. The receiver can be used to receive incoming calls. According to one embodiment, the receiver may be implemented separately from or as part of the speaker.

The display module 1360 may visually provide information to the outside (eg, a user) of the electronic device 1301 . The display module 1360 may include, for example, a display, a hologram device, or a projector and a control circuit for controlling the corresponding device. According to an embodiment, the display module 1360 may include a touch sensor configured to sense a touch or a pressure sensor configured to measure the intensity of a force generated by the touch.

The audio module 1370 may convert a sound into an electric signal or, conversely, convert an electric signal into a sound. According to an embodiment, the audio module 1370 obtains a sound through the input module 1350 or an external electronic device (eg, a sound output module 1355 ) directly or wirelessly connected to the electronic device 1301 . The electronic device 1302) (eg, a speaker or headphones) may output a sound.

The sensor module 1376 detects an operating state (eg, power or temperature) of the electronic device 1301 or an external environmental state (eg, a user state), and generates an electrical signal or data value corresponding to the sensed state. can do. According to one embodiment, the sensor module 1376 may include, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, It may include a temperature sensor, a humidity sensor, or an illuminance sensor.

The interface 1377 may support one or more specified protocols that may be used by the electronic device 1301 to directly or wirelessly connect with an external electronic device (eg, the electronic device 1302 ). According to an embodiment, the interface 1377 may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

The connection terminal 1378 may include a connector through which the electronic device 1301 can be physically connected to an external electronic device (eg, the electronic device 1302 ). According to an embodiment, the connection terminal 1378 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (eg, a headphone connector).

The haptic module 1379 may convert an electrical signal into a mechanical stimulus (eg, vibration or movement) or an electrical stimulus that the user can perceive through tactile or kinesthetic sense. According to an embodiment, the haptic module 1379 may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

The camera module 1380 may capture still images and moving images. According to an embodiment, the camera module 1380 may include one or more lenses, image sensors, image signal processors, or flashes.

The power management module 1388 may manage power supplied to the electronic device 1301 . According to an embodiment, the power management module 1388 may be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

The battery 1389 may supply power to at least one component of the electronic device 1301 . According to one embodiment, battery 1389 may include, for example, a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell.

The communication module 1390 is a direct (eg, wired) communication channel or a wireless communication channel between the electronic device 1301 and an external electronic device (eg, the electronic device 1302 , the electronic device 1304 , or the server 1308 ). It can support establishment and communication through the established communication channel. The communication module 1390 may include one or more communication processors that operate independently of the processor 1320 (eg, an application processor) and support direct (eg, wired) communication or wireless communication. According to one embodiment, the communication module 1390 is a wireless communication module 1392 (eg, a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 1394 (eg, : LAN (local area network) communication module, or a power line communication module) may be included. A corresponding communication module among these communication modules is a first network 1398 (eg, a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network 1399 (eg, legacy). It may communicate with the external electronic device 1304 through a cellular network, a 5G network, a next-generation communication network, the Internet, or a telecommunication network such as a computer network (eg, LAN or WAN). These various types of communication modules may be integrated into one component (eg, a single chip) or may be implemented as a plurality of components (eg, multiple chips) separate from each other. The wireless communication module 1392 uses subscriber information (eg, International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module 1396 within a communication network, such as the first network 1398 or the second network 1399 . The electronic device 1301 may be identified or authenticated.

The wireless communication module 1392 may support a 5G network after a 4G network and a next-generation communication technology, for example, a new radio access technology (NR). NR access technology includes high-speed transmission of high-capacity data (eMBB (enhanced mobile broadband)), minimization of terminal power and access to multiple terminals (mMTC (massive machine type communications)), or high reliability and low latency (URLLC (ultra-reliable and low-latency) -latency communications)). The wireless communication module 1392 may support a high frequency band (eg, mmWave band) to achieve a high data rate. The wireless communication module 1392 uses various techniques for securing performance in a high frequency band, for example, beamforming, massive multiple-input and multiple-output (MIMO), all-dimensional multiplexing. It may support technologies such as full dimensional MIMO (FD-MIMO), an array antenna, analog beam-forming, or a large scale antenna. The wireless communication module 1392 may support various requirements defined in the electronic device 1301 , an external electronic device (eg, the electronic device 1304 ), or a network system (eg, the second network 1399 ). According to an embodiment, the wireless communication module 1392 includes a peak data rate (eg, 20 Gbps or more) for realization of eMBB, loss coverage (eg, 164 dB or less) for realization of mMTC, or U-plane latency (for URLLC realization) ( Example: downlink (DL) and uplink (UL) each 0.5 ms or less, or round trip 1 ms or less) may be supported.

The antenna module 1397 may transmit or receive a signal or power to the outside (eg, an external electronic device). According to an embodiment, the antenna module 1397 may include an antenna including a conductor formed on a substrate (eg, a PCB) or a radiator formed of a conductive pattern. According to an embodiment, the antenna module 1397 may include a plurality of antennas (eg, an array antenna). In this case, at least one antenna suitable for a communication scheme used in a communication network such as the first network 1398 or the second network 1399 is connected from the plurality of antennas by, for example, the communication module 1390 . can be selected. A signal or power may be transmitted or received between the communication module 1390 and an external electronic device through the selected at least one antenna. According to some embodiments, other components (eg, a radio frequency integrated circuit (RFIC)) other than the radiator may be additionally formed as a part of the antenna module 1397 .

According to various embodiments, the antenna module 1397 may form a mmWave antenna module. According to one embodiment, the mmWave antenna module comprises a printed circuit board, an RFIC disposed on or adjacent to a first side (eg, bottom side) of the printed circuit board and capable of supporting a designated high frequency band (eg, mmWave band); and a plurality of antennas (eg, an array antenna) disposed on or adjacent to a second side (eg, top or side surface) of the printed circuit board and capable of transmitting or receiving signals of the designated high frequency band. can do.

At least some of the components are connected to each other through a communication method between peripheral devices (eg, a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)) and a signal ( e.g. commands or data) can be exchanged with each other.

According to an embodiment, the command or data may be transmitted or received between the electronic device 1301 and the external electronic device 1304 through the server 1308 connected to the second network 1399 . Each of the external electronic devices 1302 or 1704 may be the same or a different type of the electronic device 1301 . According to an embodiment, all or a part of operations executed in the electronic device 1301 may be executed in one or more external electronic devices 1302 , 1704 , or 1708 . For example, when the electronic device 1301 needs to perform a function or service automatically or in response to a request from a user or other device, the electronic device 1301 may instead of executing the function or service itself. Alternatively or additionally, one or more external electronic devices may be requested to perform at least a part of the function or the service. One or more external electronic devices that have received the request may execute at least a part of the requested function or service, or an additional function or service related to the request, and transmit a result of the execution to the electronic device 1301 . The electronic device 1301 may process the result as it is or additionally and provide it as at least a part of a response to the request. For this, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used. The electronic device 1301 may provide an ultra-low latency service using, for example, distributed computing or mobile edge computing. In another embodiment, the external electronic device 1304 may include an Internet of things (IoT) device. The server 1308 may be an intelligent server using machine learning and/or neural networks. According to an embodiment, the external electronic device 1304 or the server 1308 may be included in the second network 1399 . The electronic device 1301 may be applied to an intelligent service (eg, smart home, smart city, smart car, or health care) based on 5G communication technology and IoT-related technology.

According to various embodiments, an electronic device (eg, the electronic device 101 ) transmits power to a wireless power receiver (eg, the wireless power receiver 195 ) a power transmission circuit (eg, a power transmission circuit ( 311)), a communication circuit (eg, a communication circuit 313a and/or a communication circuit 313b) configured to perform communication with the wireless power receiver, and a control circuit (eg, a control circuit 312); and , the control circuit (eg, the control circuit 312) transmits the power so that the first power is applied to a coil (eg, the transmission coil 311L) of the power transmission circuit (eg, the power transmission circuit 311) The power transmission circuit controls a circuit (eg, the power transmission circuit 311 ), stops the application of the first power, and prevents power from being applied to the coil (eg, the transmission coil 311L) for a first period At least one parameter used to control (eg, the power transmission circuit 311 ), to check a first Q-factor during the first period, and to determine a power loss in power transmission after the first period Controls the power transmission circuit (eg, the power transmission circuit 311) so that at least one power is applied to the coil (eg, the transmission coil 311L) based on a calibration operation for confirming, and the at least one power stops the application of the last power, controls the power transmission circuit (eg, the power transmission circuit 311) so that power is not applied to the coil (eg, the transmission coil 311L) for a second period, and and check a second Q-factor for two periods, and check validity of the at least one parameter based on the first Q-factor and/or the second Q-factor.

According to various embodiments, when it is determined that the at least one parameter is valid, the control circuit (eg, the control circuit 312 ) transmits power for charging the wireless power receiver to the coil (eg, a transmission coil). control the power transmission circuit (eg, the power transmission circuit 311) to apply to (311L)), and during the application of power for the charging, the communication circuit (eg, the communication circuit 313a) and/or the communication circuit Using (313b)), receive a data packet including a received power level from the wireless power receiving device, and based on the level of power for charging, the received power level, and the at least one parameter, the loss It may be further set to check whether the power satisfies a specified condition, and to determine that a foreign object is disposed on the electronic device (eg, the electronic device 101) based on whether the power loss satisfies the specified condition. can

According to various embodiments, the control circuit (eg, the control circuit 312 ) stops the application of the first power, and power is applied to the coil (eg, the transmission coil 311L) for the first period. As at least part of the operation of controlling the power transmission circuit (eg, the power transmission circuit 311) so as not to Check the first received power packet from the power receiving device, and transmit the power so that power is not applied to the coil (eg, the transmitting coil 311L) for the first period included in the first received power packet It may be set to control a circuit (eg, the power transmission circuit 311 ).

According to various embodiments, the first received power packet is an RP 1 packet of the Qi standard, and the first period may be identified based on a bit in a slot time field.

According to various embodiments, the control circuit (eg, the control circuit 312 ) checks a first settling time included in the first received power packet, and starts from a reception time of the first received power packet. It may be further configured to control the communication circuit (eg, the communication circuit 313a and/or the communication circuit 313b) to transmit a response to the first received power packet after the first settling time.

According to various embodiments, the control circuit (eg, the control circuit 312 ) is further configured to check the at least one parameter using a level of a first received power included in the first received power packet, and , the wireless power receiver may transmit the first received power packet including the level of the first received power to the electronic device (eg, the electronic device 101 ) in a first load state.

According to various embodiments, the control circuit (eg, the control circuit 312 ) stops the application of the last power among the at least one power, and during the second period, the coil (eg, the transmission coil 311L) ) as at least part of the operation of controlling the power transmission circuit (eg, the power transmission circuit 311) so that power is not applied to the communication circuit (eg, the communication circuit 313a and/or the communication circuit 313b). using, check the second received power packet from the wireless power receiver, and apply power to the coil (eg, the transmitting coil 311L) during the second period included in the second received power packet It may be set to control the power transmission circuit (eg, the power transmission circuit 311 ) to prevent it from happening.

According to various embodiments, the second received power packet is an RP 2 packet of the Qi standard, and the second period may be identified based on a bit in a slot time field.

According to various embodiments, the control circuit (eg, the control circuit 312 ) is further configured to check the at least one parameter using a level of a second received power included in the second received power packet, and , the wireless power receiver may transmit the second received power packet including the second received power level to the electronic device (eg, the electronic device 101 ) in a second load state.

According to various embodiments, the control circuit (eg, the control circuit 312 ) checks the validity of the at least one parameter based on the first Q-factor and/or the second Q-factor as at least a part of, if a difference between the first Q-factor and the second Q-factor is greater than or equal to a threshold difference, it is determined that the at least one parameter is invalid, and the first Q-factor and the second When the difference between Q-factors is less than the threshold difference, it may be configured to determine that the at least one parameter is valid.

According to various embodiments, the control circuit (eg, the control circuit 312 ) checks the validity of the at least one parameter based on the first Q-factor and/or the second Q-factor when a first difference between the first Q-factor and a reference Q-factor, and/or a second difference between the second Q-factor and the reference Q-factor, is greater than or equal to a threshold difference, the at least and determine that one parameter is invalid, and when the first difference and/or the second difference are less than the threshold difference, determine that the at least one parameter is valid.

According to various embodiments, the control circuit (eg, the control circuit 312 ), while the first power is applied to the coil (eg, the transmission coil 311L), in the negotiation step with the wireless power receiver It may be further set to perform a set operation.

According to various embodiments, the control circuit (eg, the control circuit 312 ) is further configured to confirm the at least one parameter based on a plurality of calibration data points obtained after performing the operation set in the negotiation step. is set, and each of the plurality of calibration data points includes a plurality of received power levels corresponding to each of a plurality of load states of the wireless power receiver, and a plurality of transmission power levels corresponding to the plurality of received power levels. may include.

According to various embodiments, the control circuit (eg, the control circuit 312 ) transmits power for charging of the wireless power receiving device to the coil (eg, a transmitting coil ( 311L)), it may be further configured to control the power transmission circuit (eg, the power transmission circuit 311).

According to various embodiments, the wireless power receiving device (eg, the wireless power receiving device 195 ) includes a coil (eg, the receiving coil 321L) for receiving power from the electronic device (eg, the electronic device 101 ). ), a rectifier (eg, rectifier circuit 321b) for rectifying AC power output from the coil (eg, receiving coil 321L) into DC power, a processor (eg, processor 322), and a communication circuit (eg, : a first communication circuit 323a and/or a second communication circuit 323b), wherein the processor (eg, the processor 322), through the coil (eg, the receiving coil 321L), the communication circuit (eg, the first communication circuit 323a) to transmit a first data packet requesting cessation of application of the first power and maintaining the cessation of application of power for a first period while 1 power is received; and / or the second communication circuit 323b) and the last power among at least one power based on a calibration operation for checking at least one parameter used for checking power loss during power transmission is determined by the coil (eg: While being received via the receiving coil 321L), the communication circuitry (eg, the first communication circuitry) transmits a first data packet requesting cessation of application of the last power and cessation of application of power for a second period. 323a and/or the second communication circuit 323b).

According to various embodiments, the first data packet is an RP 1 packet of the Qi standard, the first period is set based on a bit in a slot time field, the second data packet is an RP 2 packet of the Qi standard, The second period may be set based on a bit in the slot time field.

According to various embodiments, the first data packet may further include a first settling time, and the second data packet may further include a second settling time.

According to various embodiments, the processor (eg, the processor 322) may determine the level of the first received power measured in a first load state of the wireless power receiving apparatus (eg, the wireless power receiving apparatus 195). Included in the first data packet, and further configured to include in the second data packet the level of the second received power measured in the second load state of the wireless power receiver (eg, the wireless power receiver 195) can be

According to various embodiments, the processor (eg, the processor 322) checks the output voltage of the rectifier (eg, the rectifier circuit 321b), and the output voltage of the rectifier (eg, the rectifier circuit 321b)) Based on , it may be further configured to confirm the first period and/or the second period.

According to various embodiments, the processor (eg, the processor 322 ) checks the magnitude of a current input to a load of the wireless power receiving device (eg, the wireless power receiving device 195 ), and inputs it to the load. It may be further configured to identify the first period and/or the second period based on the current.

The electronic device according to various embodiments disclosed in this document may have various types of devices. The electronic device may include, for example, a portable communication device (eg, a smart phone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance device. The electronic device according to the embodiment of the present document is not limited to the above-described devices.

It should be understood that the various embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and include various modifications, equivalents, or substitutions of the embodiments. In connection with the description of the drawings, like reference numerals may be used for similar or related components. The singular form of the noun corresponding to the item may include one or more of the item, unless the relevant context clearly dictates otherwise. As used herein, "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "A , B, or C" each may include any one of the items listed together in the corresponding one of the phrases, or all possible combinations thereof. Terms such as “first”, “second”, or “first” or “second” may simply be used to distinguish the component from other components in question, and may refer to components in other aspects (e.g., importance or order) is not limited. It is said that one (eg, first) component is "coupled" or "connected" to another (eg, second) component, with or without the terms "functionally" or "communicatively". When mentioned, it means that one component can be connected to the other component directly (eg by wire), wirelessly, or through a third component.

The term "module" used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and is interchangeable with terms such as, for example, logic, logic block, component, or circuit. can be used as A module may be an integrally formed part or a minimum unit or a part of the part that performs one or more functions. For example, according to an embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

Various embodiments of the present document are stored in a storage medium (eg, internal memory or external memory) readable by a machine (eg, the electronic device 101 and/or the wireless power receiver 195). It may be implemented as software (eg, a program) including one or more stored instructions. For example, the processor of the device (eg, the electronic device 101 and/or the wireless power receiving device 195 ) may call at least one command among one or more commands stored from a storage medium and execute it. This makes it possible for the device to be operated to perform at least one function according to the at least one command called. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' only means that the storage medium is a tangible device and does not contain a signal (eg, electromagnetic wave), and this term refers to the case where data is semi-permanently stored in the storage medium and It does not distinguish between temporary storage cases.

According to one embodiment, the method according to various embodiments disclosed in this document may be provided as included in a computer program product. Computer program products may be traded between sellers and buyers as commodities. The computer program product is distributed in the form of a machine-readable storage medium (eg compact disc read only memory (CD-ROM)), or via an application store (eg Play Store™) or on two user devices ( It can be distributed (eg downloaded or uploaded) directly or online between smartphones (eg: smartphones). In the case of online distribution, at least a part of the computer program product may be temporarily stored or temporarily created in a machine-readable storage medium such as a memory of a server of a manufacturer, a server of an application store, or a relay server.

According to various embodiments, each component (eg, a module or a program) of the above-described components may include a singular or a plurality of entities, and some of the plurality of entities may be separately disposed in other components. have. According to various embodiments, one or more components or operations among the above-described corresponding components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (eg, a module or a program) may be integrated into one component. In this case, the integrated component may perform one or more functions of each component of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. . According to various embodiments, operations performed by a module, program, or other component are executed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations are executed in a different order, or omitted. or one or more other operations may be added.

101: electronic device
195: wireless power receiver
311: power transmission circuit
312: control circuit
313: communication circuit
314: sensing circuit
321: power receiving circuit
322: processor
323: communication circuit
324: sensors
325: display

Claims (20)

In an electronic device,
a power transmission circuit for transmitting power to a wireless power receiving device;
a communication circuit configured to communicate with the wireless power receiver; and
A control circuit comprising:
controlling the power transmission circuit so that a first power is applied to the coil of the power transmission circuit,
stop the application of the first power, and control the power transmission circuit so that no power is applied to the coil for a first period;
identifying a first Q-factor for the first period,
After the first period, control the power transmission circuit so that at least one power is applied to the coil based on a calibration operation for checking at least one parameter used for checking power loss during power transmission,
stopping the application of the last power among the at least one power, and controlling the power transmission circuit so that no power is applied to the coil for a second period;
identifying a second Q-factor for the second period,
The electronic device is configured to check validity of the at least one parameter based on the first Q-factor and/or the second Q-factor. The method of claim 1,
The control circuit is configured to: when it is determined that the at least one parameter is valid:
controlling the power transmission circuit to apply power for charging the wireless power receiving device to the coil,
receiving a data packet including a received power level from the wireless power receiving device using the communication circuit during the application of power for the charging;
Based on the level of power for the charging, the received power level, and the at least one parameter, it is checked whether the power loss satisfies a specified condition,
An electronic device further configured to determine that a foreign material is disposed on the electronic device based on the loss of power satisfying the specified condition. The method of claim 1,
The control circuit, as at least part of the operation of stopping the application of the first power and controlling the power transmission circuit so that no power is applied to the coil for the first period,
using the communication circuit to check the first received power packet from the wireless power receiver;
an electronic device configured to control the power transmission circuit such that power is not applied to the coil during the first period included in the first received power packet. 4. The method of claim 3,
The first received power packet is an RP 1 packet of a Qi standard, and the first period is identified based on a bit in a slot time field. 4. The method of claim 3,
The control circuit is
Checking a first settling time included in the first received power packet,
The electronic device further configured to control the communication circuit to transmit a response to the first received power packet after the first settling time from the reception time of the first received power packet. 4. The method of claim 3,
The control circuit is
further configured to check the at least one parameter using a level of a first received power included in the first received power packet,
The wireless power receiver is configured to transmit the first received power packet including the level of the first received power to the electronic device in a first load state. The method of claim 1,
the control circuit, as at least part of the operation of stopping the application of the last power among the at least one power, and controlling the power transmission circuit so that no power is applied to the coil during the second period;
using the communication circuit to check the second received power packet from the wireless power receiver;
an electronic device configured to control the power transmission circuit such that power is not applied to the coil during the second period included in the second received power packet. 8. The method of claim 7,
The second received power packet is an RP 2 packet of a Qi standard, and the second period is identified based on a bit in a slot time field. 8. The method of claim 7,
The control circuit is
further configured to check the at least one parameter using a level of a second received power included in the second received power packet,
The wireless power receiver is configured to transmit the second received power packet including the level of the second received power to the electronic device in a second load state. The method of claim 1,
the control circuit, as at least part of the operation of verifying the validity of the at least one parameter based on the first Q-factor and/or the second Q-factor,
if the difference between the first Q-factor and the second Q-factor is greater than or equal to a threshold difference, it is determined that the at least one parameter is invalid;
the electronic device configured to determine that the at least one parameter is valid when the difference between the first Q-factor and the second Q-factor is less than the threshold difference. The method of claim 1,
the control circuit, as at least part of the operation of verifying the validity of the at least one parameter based on the first Q-factor and/or the second Q-factor,
If the first difference between the first Q-factor and the reference Q-factor, and/or the second difference between the second Q-factor and the reference Q-factor, is greater than or equal to a threshold difference, the at least one parameter is judged to be invalid,
The electronic device is configured to determine that the at least one parameter is valid when the first difference and/or the second difference is less than the threshold difference. The method of claim 1,
The control circuit is
An electronic device further configured to perform an operation set in a negotiation step with the wireless power receiver while the first power is applied to the coil. 13. The method of claim 12,
the control circuit is further configured to check the at least one parameter based on a plurality of calibration data points obtained after performing the operation set in the negotiation step;
Each of the plurality of calibration data points includes a plurality of received power levels corresponding to a plurality of load states of the wireless power receiver, respectively, and a plurality of transmit power levels corresponding to the plurality of received power levels. electronic device. 14. The method of claim 13,
The control circuit is further configured to control the power transmission circuit to apply power for charging the wireless power receiver to the coil based on whether the at least one parameter is valid. A wireless power receiver comprising:
a coil for receiving power from the electronic device;
a rectifier for rectifying AC power output from the coil into DC power;
processor, and
communication circuitry;
The processor is
control the communication circuitry to transmit, via the coil, a first data packet requesting, while the first power is received, cessation of the application of the first power and the maintenance of the cessation of the application of the power for a first period;
Interruption of application of the last power and a second period while the last power of at least one power is received through the coil based on a calibration operation for checking at least one parameter used for checking power loss in power transmission A wireless power receiving apparatus configured to control the communication circuit to transmit a first data packet requesting to maintain interruption of power application during a period of time. 16. The method of claim 15,
the first data packet is a RP 1 packet of the Qi standard, the first period is set based on a bit in the slot time field,
The second data packet is a Qi standard RP 2 packet, and the second period is set based on a bit in a slot time field. 16. The method of claim 15,
The first data packet further includes a first settling time, and the second data packet further includes a second settling time. 16. The method of claim 15,
The processor is
including the level of the first received power measured in the first load state of the wireless power receiver in the first data packet,
The wireless power receiver is further configured to include in the second data packet the level of the second received power measured in the second load state of the wireless power receiver. 16. The method of claim 15,
The processor is
Check the output voltage of the rectifier,
Based on the output voltage of the rectifier, the wireless power receiver further configured to check the first period and / or the second period. 16. The method of claim 15,
The processor is
Check the magnitude of the current input to the load of the wireless power receiver,
A wireless power receiver further configured to check the first period and/or the second period based on the current input to the load.

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