KR102115459B1 - Apparatus and method for wireless charge - Google Patents

Abstract

An embodiment of the present invention relates to a wireless charging method, the process of receiving required power from a second wireless power receiver during power supply to at least one first wireless power receiver, the at least one first wireless power receiver and a second Calculating the required power of all the wireless power receivers including the wireless power receiver, and transmitting the insufficient power information to each of the wireless power receivers if the maximum power available is not greater than the required power of the wireless power receivers It may include. In addition, various embodiments are possible.

Description

Wireless charging device and method{APPARATUS AND METHOD FOR WIRELESS CHARGE}

An embodiment of the present invention relates to a wireless charging technology.

A mobile terminal such as a mobile phone or a PDA (PersoNal Digital AssistaNts) is driven by a rechargeable battery due to its characteristics. In order to charge such a battery, a separate charging device is used to supply electric energy to the battery of the mobile terminal. Usually, separate contact terminals are provided on the outside of the charging device and the battery, so that the charging device and the battery are electrically connected by contacting them.

However, in this type of contact charging, since the contact terminal protrudes to the outside, contamination by foreign matter is easy and for this reason, a problem of battery charging is not performed correctly. In addition, charging is not performed properly even when the contact terminals are exposed to moisture.

In order to solve this problem, wireless charging or contactless charging technology has been developed in recent years and has been utilized in many electronic devices.

This wireless charging technology uses wireless power transmission and reception, and is a system that can automatically charge a battery by simply placing a mobile phone on a charging pad without connecting by a separate charging connector, for example. Generally, the wireless charging technology is applied to a wireless electric toothbrush or a wireless electric shaver, and is known to the public. This wireless charging technology has the advantage of increasing the waterproof function by charging the electronic products wirelessly, and has the advantage of increasing the portability of electronic devices since a wired charger is not required, and related technologies are expected to greatly develop in the coming electric vehicle era. .

The wireless charging technology includes a magnetic induction method using a coil, a resonance method using resonance (ResoNaNce), and a radio wave radiation (RF/Micro Wave RadiatioN) method that converts and transmits electrical energy into microwaves.

Until now, the method using electromagnetic induction has become the mainstream, but recently, at home and abroad, it has succeeded in experiments to transmit power wirelessly at a distance of several tens of meters using microwaves. It seems that the world will be opened.

The method of transmitting power by electromagnetic induction is a method of transmitting power between the primary coil and the secondary coil. When a magnet is moved in a coil, an induced current is generated. Using this, a magnetic field is generated at a transmitting end and a current is induced according to a change in a magnetic field at the receiving end to generate energy. This phenomenon is called a magnetic induction phenomenon, and the power transmission method using the phenomenon has excellent energy transmission efficiency.

The resonance method was announced in 2005 as "Coupled Mode Theory" by MIT professor "Soljacic". It is a system in which electricity is transmitted wirelessly even a few meters (m) away from the charging device using the resonance method power transmission principle. The MIT team's wireless charging system is based on the concept of physics, where the sound of a resonator (resoNaNce) sounds and the wine glasses next to it sound at the same frequency. Instead of resonating the sound, the researchers resonated electromagnetic waves containing electrical energy. Resonant electric energy is transmitted directly only when a device with a resonance frequency is present, and since unused parts are absorbed into an electric field instead of spreading into the air, unlike other electromagnetic waves, it is not expected to affect surrounding machinery or the body. .

For example, when the above-described wireless power transmission technology is used in a wireless charging system, the wireless charging system may be configured with a wireless power transmitter that transmits power and a wireless power receiver that receives power to charge power to the battery. have. The wireless power transmitter supplies power to the object by transmitting power required for charging. The wireless power receiver may perform charging using the transmitted power. Recently, a multi-charging system in which a plurality of wireless power receivers receive and charge power from one wireless power transmitter has been developed and used.

However, in the case of the existing wireless charging system, the amount of power required is variable depending on the number of wireless power receivers. However, since the amount of power supplied from the wireless power transmitter is fixed at a constant amount of power, there is a problem in that efficient power supply is not provided.

For example, the wireless power transmitter of the conventional wireless charging system has a problem in that efficient power supply is not provided when the maximum transmission power is determined by using a single antenna (TA).

In addition, if the wireless power transmitter uses the power tracking function (Power TrackiNg), the maximum power of the wireless power transmitter cannot be changed. Therefore, a problem may occur when the number of wireless power receivers increases.

Accordingly, an object of the present invention is to provide a wireless charging apparatus and method capable of efficient charging even when the number of wireless power receivers increases.

According to an embodiment of the present invention, in a wireless charging method, a process of receiving required power from a second wireless power receiver during power supply to at least one first wireless power receiver, the at least one first wireless power receiver and the 2 The process of calculating the required power of all the wireless power receivers including the wireless power receiver. If the maximum power available is not greater than the required power of the entire wireless power receivers, the insufficient power information is transmitted to each of the wireless power receivers. Process.

According to another embodiment of the present invention, in a wireless charging method, in a wireless charging method, a process of transmitting required power to a wireless power transmitter, a process of receiving insufficient power information from the wireless power transmitter, and the insufficient power information It may include a process of varying the charging current value using.

According to another embodiment of the present invention, in a wireless power transmitter, a power transmission unit for transmitting wireless power, a communication unit for receiving the required power from the second wireless power receiver during power transmission to the at least one first wireless power receiver, the Calculate the required power of all the wireless power receivers including at least one first wireless power receiver and the second wireless power receiver, and if the maximum power available is not greater than the required power of the entire wireless power receivers, the insufficient power amount information is It may include a control unit for controlling to transmit to each of the entire wireless power receiver.

In addition, according to another embodiment of the present invention, in a wireless power receiver, a power receiving unit for receiving power and receiving charging to receive wireless power from a wireless power transmitter, a communication unit for transmitting and receiving the wireless power transmitter, wireless power required power It may include a control unit that controls to transmit to the transmitter, and controls to vary the charging current value of the power receiving unit by using the insufficient amount of power information when insufficient information is received from the wireless power transmitter.

According to an embodiment of the present invention, when charging is performed by transmitting power to a plurality of wireless power receivers using a wireless power transmitter, efficiency of wireless charging may be improved.

In addition, according to an embodiment of the present invention, when the wireless power transmitter desires to provide additional power to a new wireless power receiver during power supply to a plurality of wireless power receivers, it is possible to provide an efficient power supply.

1 is a conceptual diagram of a wireless charging system according to an embodiment of the present invention.
2 is a flowchart illustrating an overall operation of the wireless charging system according to an embodiment of the present invention.
3 is a block diagram of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.
4 is a detailed block diagram of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.
5 is an operation flowchart of a wireless power transmitter according to an embodiment of the present invention.
6 is a flowchart illustrating an operation of a wireless power receiver according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail. It should be noted that the same components in the drawings are indicated by the same reference numerals wherever possible. In the following description and accompanying drawings, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention are omitted.

1 is a conceptual diagram of a wireless charging system according to an embodiment of the present invention. 1, the wireless charging system may include a wireless power transmitter 100 and at least one wireless power receiver (110-1, 110-2, ..., 110-N, 110-N+1). have.

The wireless power transmitter 100 wirelessly powers at least one wireless power receiver 110-1, 110-2, ..., 110-N, 110-N+1, respectively. 1-N, 1-N+1) can be transmitted. In more detail, the wireless power transmitter 100 wirelessly powers (1-1, 1-2, …, 1-N, 1-N+1) to an authenticated wireless power receiver that has performed a predetermined authentication procedure. Can be sent.

The wireless power transmitter 100 may form an electrical connection with wireless power receivers 110-1, 110-2, ..., 110-N, 110-N+1. For example, the wireless power transmitter 100 may transmit wireless power in the form of electromagnetic waves to the wireless power receivers 110-1, 110-2, ..., 110-N, 110-N+1.

Meanwhile, the wireless power transmitter 100 may perform two-way communication with the wireless power receivers 110-1, 110-2, ..., 110-N, 110-N+1. Here, the wireless power transmitter 100 and the wireless power receivers 110-1, 110-2, ..., 110-N, 110-N+1 are packets (2-1, 2-2, ...) composed of predetermined frames. , 2-N, 2-N+1). In particular, the wireless power receiver may be implemented as a mobile communication terminal, PDA, PMP, smartphone, or the like.

The wireless power transmitter 100 may wirelessly provide power to a plurality of wireless power receivers 110-1, 110-2, ..., 110-N, 110-N+1. For example, the wireless power transmitter 100 may transmit power to a plurality of wireless power receivers 110-1, 110-2, ..., 110-N, 110-N+1 through a resonance method. When the wireless power transmitter 100 adopts the resonance method, the distance between the wireless power transmitter 100 and a plurality of wireless power receivers 110-1, 110-2, ..., 110-N, 110-N+1 is preferable. It can be less than 30m. In addition, when the wireless power transmitter 100 adopts an electromagnetic induction method, between the wireless power transmitter 100 and a plurality of wireless power receivers 110-1, 110-2, ..., 110-N, 110-N+1 The distance may preferably be 10 cm or less.

The wireless power receivers 110-1, 110-2, ..., 110-N, 110-N+1 may receive wireless power from the wireless power transmitter 100 to perform charging of a battery provided therein. In addition, the wireless power receiver (110-1, 110-2, ..., 110-N, 110-N+1) is a signal for requesting wireless power transmission, information required for wireless power reception, wireless power receiver status information, or wireless power The transmitter 100 may transmit control information or the like to the wireless power transmitter 100.

In addition, the wireless power receivers 110-1, 110-2, ..., 110-N, 110-N+1 may transmit a message indicating each charging state to the wireless power transmitter 100.

The wireless power transmitter 100 may include display means such as a display, and based on messages received from each of the wireless power receivers 110-1, 110-2, ..., 110-N, 110-N+1. Each of the wireless power receivers 110-1, 110-2, ..., 110-N, 110-N+1 may be displayed. In addition, the wireless power transmitter 100 may also display the estimated time until charging of each wireless power receiver 110-1, 110-2, ..., 110-N, 110-N+1 is completed. .

The wireless power transmitter 100 may transmit a control signal to disable the wireless charging function to each of the wireless power receivers 110-1, 110-2, ..., 110-N, 110-N+1. have. The wireless power receiver receiving the disable control signal of the wireless charging function from the wireless power transmitter 100 may disable the wireless charging function.

According to an embodiment of the present invention, the amount of power required in the wireless charging system as described above may vary depending on the number of wireless power receivers. On the other hand, when the amount of power supplied to each of the wireless power receivers in the wireless power transmitter 100 is fixed at a constant amount of power, efficient power supply may not be provided. For example, if the wireless power transmitter 100 is configured to supply power with a constant amount of power to up to N wireless power receivers 110-1, 110-2, ..., 110-N, an additional new N+1 th When charging is requested from the wireless power receiver 110-N+1 of, power may not be supplied to the N+1 th wireless power receiver 110-N+1.

Accordingly, in the embodiment of the present invention, while the wireless power transmitter 100 supplies power to the N wireless power receivers 110-1, 110-2, ..., 110-N, additional new wireless power receivers 110- N+1), when charging is requested, adjusts the amount of power supplied to each of the N wireless power receivers 110-1, 110-2, ..., 110-N, and also applies to the new wireless power receiver 110-N+1. An object of the present invention is to provide a wireless charging device and method capable of supplying power.

2 is a flowchart illustrating the overall operation of the wireless charging system according to an embodiment of the present invention. Referring to FIG. 2, the wireless power transmitter 100 is a new wireless power receiver 110-N+1 in operation 204 during charging N wireless power receivers 110-1 to 110-N (RX) in operation 202. When (New RX) is added, the amount of power required by the new wireless power receiver 110-N+1 (New RX) in operation 206 may be transmitted to the wireless power transmitter 100 (Power TX).

The wireless power transmitter 100 determines whether the maximum power (TX max Power) that can be provided in operation 208 is greater than the required power of N+1 wireless power receivers 110-1 to 110-N+1. Can be.

If the maximum power (TX max Power) that can be provided to the wireless power transmitter 100 is greater than the required power (N+1 Power amount) of N+1 wireless power receivers 110-1 to 110-N+1 In operation 210, transmission power (TX power) may be increased according to the required power of N+1 wireless power receivers 110-1 to 110-N+1 in operation 210. Accordingly, the N+1 wireless power receivers 110-1 to 110-N+1 may charge the N+1 wireless power receiver by receiving power in operation 212.

On the other hand, if the maximum power that the wireless power transmitter 100 can provide (TX max Power) is not greater than the required power of the N+1 wireless power receivers 110-1 to 110-N+1, in operation 222 The insufficient amount of power may be reported to all wireless power receivers, for example, N+1 wireless power receivers 110-1 to 110-N+1.

The N+1 wireless power receivers 110-1 to 110-N+1 may vary (reduce) the charging current value of the Rx Charger according to the insufficient amount of power in operation 224, respectively. In addition, the N+1 wireless power receivers 110-1 to 110-N+1 may transmit the required amount of power to the wireless power transmitter 100 according to the variable charging power value in operation 226.

The wireless power transmitter 100 has a maximum power (TX max power) that can be provided in operation 228 and requires power of N+1 wireless power receivers 110-1 to 110-N+1 (variable power required). It can be judged whether it is larger.

If the maximum power (TX max Power) that can be provided by the wireless power transmitter 100 is greater than the required power (variable required power) of the N+1 wireless power receivers 110-1 to 110-N+1, In operation 230, transmit power (TX Power) may be increased according to the required power (variable required power) of the N+1 wireless power receivers 110-1 to 110-N+1. Accordingly, the N+1 wireless power receivers 110-1 to 110-N+1 may receive power from the wireless power transmitter 100 in operation 232 to perform charging.

Meanwhile, the maximum power (TX max Power) that can be provided in the wireless power transmitter 100 is greater than the required power (variable required power) of N+1 wireless power receivers 110-1 to 110-N+1. If not, return to operation 222 to inform all wireless power receivers, such as N+1 wireless power receivers 110-1 to 110-N+1, of insufficient power, and provide the maximum power (TX max Power) that can be provided. Operations 222 to 228 may be repeatedly performed until the required power (variable required power) of the N+1 wireless power receivers 110-1 to 110-N+1 is greater.

In the wireless charging system according to the embodiment of the present invention, the wireless power transmitter 100 is added to a new power receiver 110-N+1 while supplying power to the N power receivers 110-1 to 110-N. If it is desired to provide electric power, an efficient power supply can be provided.

Hereinafter, a configuration of a wireless power transmitter and a wireless power receiver in a wireless charging system according to an embodiment of the present invention as described above will be described in more detail by way of example.

3 is a block diagram of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.

Referring to FIG. 3, the wireless power transmitter 300 may include a power transmission unit 311, a control unit 312 and a communication unit 313. In addition, the wireless power receiver 350 may include a power receiving unit 351, a control unit 352, and a communication unit 353.

The power transmitter 311 may provide power required by the wireless power transmitter 300 and wirelessly provide power to the wireless power receiver 350. Here, the power transmission unit 311 may supply power in the form of an AC waveform, and while supplying power in the form of an AC waveform, it may be converted into an AC waveform using an inverter and supplied in the form of an AC waveform. The power transmitter 311 may be implemented in the form of a built-in battery, or may be implemented in the form of a power receiving interface to receive power from the outside and supply it to other components. It will be readily understood by those skilled in the art that the power transmitter 311 is not limited as long as it is a means capable of providing power having a constant AC waveform.

In addition, the power transmission unit 311 may provide the AC power in the form of electromagnetic waves to the wireless power receiver 350. The power transmitter 311 may further include a resonant circuit, and accordingly, may transmit or receive a predetermined electromagnetic wave. When the power transmission unit 311 is implemented as a resonance circuit, the inductance L of the loop coil of the resonance circuit may be changeable. Meanwhile, those skilled in the art will readily understand that the power transmitter 311 is not limited as long as it is a means for transmitting and receiving electromagnetic waves.

The control unit 312 may control the overall operation of the wireless power transmitter 300. The control unit 312 may control the overall operation of the wireless power transmitter 300 by using an algorithm, program, or application required for control read from a storage unit (not shown). The control unit 312 may be implemented in the form of a CPU, microprocessor, mini computer.

For example, the control unit 312 when the required power is received from the new wireless power receiver (N+1) during power supply to the at least one wireless power receiver (N), the at least one wireless power receiver (N) and a new wireless power receiver The required power of the entire wireless power receiver including (N+1) may be calculated. At this time, if the maximum power that can be provided is greater than the required power of the entire wireless power receiver, the controller 312 may control to transmit power according to the required power of the entire wireless power receiver. In addition, the control unit 312 may control to transmit insufficient power information to each of the entire wireless power receivers when the maximum power that can be provided is not greater than the required power of the entire wireless power receivers. The control unit 312 may control to transmit power according to the variable required power of each of the entire wireless power receivers when variable required power is received from each of the entire wireless power receivers according to the insufficient power amount information.

The communication unit 313 may communicate with the wireless power receiver 350 in a predetermined manner. The communication unit 313 communicates with the communication unit 353 of the wireless power receiver 350 using Near Field CommuNicatioN (NFC), Zigbee communication, infrared communication, visible light communication, Bluetooth communication, and Bluetooth low eNergy (BLE) method. It can be done. The communication unit 313 may use a CSMA/CA algorithm. On the other hand, the above-described communication method is merely exemplary, and embodiments of the present invention are not limited to the scope of the right as a specific communication method performed by the communication unit 313.

Meanwhile, the communication unit 313 may transmit a signal for information of the wireless power transmitter 300. Here, the communication unit 313 may unicast (uNicast), multicast (multicast) or broadcast (broadcast) the signal.

Also, the communication unit 313 may receive required power information or variable required power information from the wireless power receiver 350. Here, the power information may include at least one of a charging current value, a capacity, a battery remaining amount, a charging number, a usage amount, a battery capacity, and a battery ratio of the wireless power receiver 350.

In addition, the communication unit 313 may transmit a charging function control signal that controls the charging function of the wireless power receiver 350. The charging function control signal may be a control signal that enables the charging function to be enabled (eNabled) or disabled by controlling the wireless power receiving unit 351 of the specific wireless power receiver 350.

The communication unit 313 may receive signals from other wireless power transmitters (not shown) as well as the wireless power receiver 350. For example, the communication unit 313 may receive a notice signal from another wireless power transmitter.

Meanwhile, in FIG. 3, although the power transmission unit 311 and the communication unit 313 are configured with different hardware, the wireless power transmitter 300 is illustrated as being communicated in an out-baNd format, but this is exemplary. In the present invention, the power transmission unit 311 and the communication unit 313 are implemented with one hardware, so that the wireless power transmitter 300 may perform communication in an in-band (iN-baNd) format.

The wireless power transmitter 300 and the wireless power receiver 350 can transmit and receive various signals, and accordingly, the wireless power receiver 350 joins the wireless power receiver 350 and the wireless power transmission/reception by the wireless power transmitter 300 The charging process through can be performed.

4 is a detailed block diagram of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.

As illustrated in FIG. 4, the wireless power transmitter 300 may include a power transmission unit 311, a control unit and communication units 312, 313, a driving unit 314, an amplification unit 315, and a matching unit 316. have. The wireless power receiver 350 may include a power receiving unit 351, a control unit and communication units 352 and 353, a rectifying unit 354, a DC/DC converter unit 355, a switch unit 356, and a load unit 357. Can be.

The driving unit 314 may output DC power having a predetermined voltage value. The voltage value of the DC power output from the driving unit 314 may be controlled by the control unit and communication units 312 and 313.

The direct current output from the driving unit 314 may be output to the amplifying unit 315. The amplifying unit 315 may amplify the direct current with a predetermined gain. In addition, DC power may be converted to AC based on signals input from the control unit and the communication units 312 and 313. Accordingly, the amplifying unit 315 may output AC power.

The matching unit 316 may perform impedance matching. For example, the impedance viewed from the matching unit 316 may be adjusted to control the output power to be high efficiency or high output. The matching unit 316 may adjust the impedance based on the control of the control unit and the communication units 312 and 313. Matching unit 316 may include at least one of a coil and a capacitor. The control unit and the communication units 312 and 313 may control a connection state with at least one of the coil and the capacitor, and thus perform impedance matching.

The power transmitter 311 may transmit the input AC power to the power receiver 351. The power transmitting unit 311 and the power receiving unit 351 may be implemented as a resonance circuit having the same resonance frequency. For example, the resonance frequency can be determined to be 6.78 MHz. The power receiving unit 351 may receive charging power.

Meanwhile, the control unit and the communication units 312 and 313 may communicate with the control unit and communication units 352 and 353 on the wireless power receiver 350 side, for example, communication using a bidirectional 2.4 GHz frequency (WiFi, ZigBee, BT/BLE) ).

For example, the control unit 352 may control required power to be transmitted to the wireless power transmitter 300. The control unit 352 may receive the charging power transmitted from the power transmitter 300 and perform control necessary to perform charging. In addition, when insufficient power amount information is received from the wireless power transmitter 300, the control unit 352 may control the charging current value of the charging unit Rx Charger to be variable using the insufficient power amount information (for example, charging current). It can be controlled to lower the value to a lower value). In addition, the control unit 352 may control to transmit the required variable power according to the variable charging current value to the wireless power transmitter 300.

The rectifying unit 354 may rectify the wireless power received by the power receiving unit 351 in a DC form, and may be implemented in the form of a bridge diode, for example. The DC/DC converter unit 355 may convert rectified power to a predetermined gain. For example, the DC/DC converter unit 355 may convert rectified power so that the voltage of the output terminal 359 becomes 5V. Meanwhile, the minimum and maximum values of the voltage that can be applied may be preset at the front end 358 of the DC/DC converter unit 355.

The switch unit 356 may connect the DC/DC converter unit 355 and the load unit 357. The switch unit 356 may maintain an on (oN)/off (off) state under the control of the control unit 352. The load unit 357 may store the converted power input from the DC/DC converter unit 355 when the switch unit 356 is turned on.

Hereinafter, the operation of the wireless power transmitter 300 and the wireless power receiver 350 configured as described above will be described as an example.

First, FIG. 5 is an operation flowchart of a wireless power transmitter 300 according to an embodiment of the present invention. Referring to FIG. 5, the wireless power transmitter 300 may receive required power from a new wireless power receiver N+1 during power supply to at least one wireless power receiver N in operation 510.

When the required power is received from the new wireless power receiver (N+1) while power is being supplied to the at least one wireless power receiver (N), the wireless power transmitter 300 may perform a new operation with the at least one wireless power receiver (N) in operation 520. The required power of the entire wireless power receiver including the wireless power receiver N+1 may be calculated.

The wireless power transmitter 300 may determine whether the maximum power available in operation 530 is greater than the power required of the entire wireless power receiver.

If the maximum power that can be provided is greater than the required power of the entire wireless power receiver, the wireless power transmitter 300 may transmit power according to the required power of the entire wireless power receiver in operation 540.

If the maximum power that can be provided is not greater than the required power of the entire wireless power receiver, the wireless power transmitter 300 may transmit insufficient power information in operation 550 to each of the entire wireless power receivers.

Each wireless power receiver may vary the charging current value of the charging unit (Rx Charger) using insufficient power information (for example, the charging current value may be lowered to a low value). In addition, each of the entire wireless power receivers may transmit the changed required power according to the variable charging current value back to the wireless power transmitter 300.

The wireless power transmitter 300 may receive variable power required from each of the entire wireless power receivers and transmit power to each of the entire wireless power receivers.

Meanwhile, FIG. 6 is a flowchart illustrating an operation of the wireless power receiver 350 according to an embodiment of the present invention. Referring to FIG. 6, the wireless power receiver 350 may transmit power required in operation 610 to the wireless power transmitter 300.

In operation 620, the wireless power receiver 350 may determine whether insufficient power amount information is received from the wireless power transmitter 300.

When insufficient power amount information is received from the wireless power transmitter 300, the wireless power receiver 350 may vary the charging current value of the charging unit (Rx Charger) using the insufficient power amount information in operation 630 (for example, charging current). You can lower the value to a lower value). In addition, the wireless power receiver 350 may transmit the variable required power according to the variable charging current value to the wireless power transmitter 300.

If the insufficient amount of power information is not received from the wireless power transmitter 300, the wireless power receiver 350 may receive the power transmitted from the wireless power transmitter 300 in operation 640 to perform charging.

In the above, preferred embodiments of the present invention have been illustrated and described, but any person having ordinary knowledge in the technical field to which the present invention belongs, preferred embodiments of the present invention within the scope not departing from the technical spirit and scope of the present invention It goes without saying that the examples can be varied. Therefore, the present invention may be implemented in various modifications without departing from the gist of the present invention as claimed in the claims, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

Claims (12)

In the wireless charging method in the wireless power transmitter,
A process of receiving a power request signal from the second wireless power receiver while supplying power to the first wireless power receiver,
Calculating a first required power amount of the first wireless power receiver and a second required power amount of the second wireless power receiver,
In response to the maximum amount of power that can be provided by the wireless power transmitter being smaller than the amount of power required corresponding to the sum of the first amount of power and the second amount of power required, the first wireless power receiver receives insufficient power amount information associated with the required amount of power. And transmitting to each of the second wireless power receivers.
Receiving a first variable required power amount less than the first required power amount from the first wireless power receiver and a second variable required power amount less than the second required power amount from the second wireless power receiver, and
Supplying power to the first wireless power receiver and the second wireless power receiver, respectively, in response to the maximum amount of power available from the wireless power transmitter being greater than the first variable required power amount and the second variable required power amount, respectively. Wireless charging method comprising a.
According to claim 1,
The first wireless power receiver and the second wireless power receiver are respectively powered in response to the maximum amount of power that can be provided by the wireless power transmitter being greater than the required amount of power corresponding to the sum of the first required power amount and the second required power amount. Wireless charging method characterized in that it further comprises a process of supplying.
delete In the wireless charging method in the wireless power receiver,
The process of transmitting the required first amount of power to the wireless power transmitter,
Receiving a first insufficient amount of power information from the wireless power transmitter,
Changing a charging current value based on a second power amount smaller than the first power amount using the first insufficient power amount information, and transmitting the second power amount to the wireless power transmitter,
Receiving the second insufficient power amount information based on the second power amount from the wireless power transmitter, and
And charging the current value based on a third power amount smaller than the second power amount and transmitting the third power amount to the wireless power transmitter using the second insufficient power amount information. Way.
delete The method of claim 4,
And receiving power received from the wireless power transmitter and performing charging based on the second power amount or the third power amount.
In a wireless power transmitter,
Power transmission unit for transmitting wireless power,
A communication unit communicating with the first wireless power receiver and the second wireless power receiver, and
It includes a control unit,
When the power request signal is received from the second wireless power receiver through the communication unit during power supply to the first wireless power receiver, the control unit may include a first required power amount of the first wireless power receiver and a second wireless power receiver. 2 Calculate the required power amount, and provide the first wireless power with insufficient power amount information associated with the required power amount in response to a maximum amount of power that can be provided is less than the required power amount corresponding to the sum of the first required power amount and the second required power amount. A first variable required power amount less than the first required power amount from the first wireless power receiver and a second variable less than the second required power amount from the second wireless power receiver, transmitted to each of the receiver and the second wireless power receiver Receiving the required amount of power, and supplying power to the first wireless power receiver and the second wireless power receiver, respectively, in response to the maximum amount of power that can be provided is greater than the sum of the first variable required power amount and the second variable required power amount Wireless power transmitter, characterized in that for controlling the power transmitter to supply.
The method of claim 7,
Wherein the controller controls the power transmitter to supply power to the first wireless power receiver and the second wireless power receiver in response to the maximum amount of power that can be provided is greater than the required amount of power. .
delete In the wireless power receiver,
Power receiving unit for receiving power and charging by receiving wireless power from a wireless power transmitter,
Communication unit for performing communication with the wireless power transmitter, and
Transmit the required first power amount to the wireless power transmitter through the communication unit, receive first insufficient power amount information from the wireless power transmitter, and use the first insufficient power amount information to generate a second power amount smaller than the first power amount. Change the charging current value based on, transmit the second power amount to the wireless power transmitter, receive the second insufficient power amount information based on the second power amount from the wireless power transmitter, and use the second insufficient power amount information And a control unit configured to control a charging current value based on a third power amount smaller than the second power amount and to control the third power amount to be transmitted to the wireless power transmitter.
delete The method of claim 10,
The control unit controls the wireless power receiver to perform charging by receiving power received from the wireless power transmitter based on the second power amount or the third power amount.

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