CN108879985A - Power supply device of induction type power supply system and near field communication device identification method - Google Patents

Abstract

The invention discloses a power supply device used in an inductive power supply system, which includes: a power supply coil, a reference coil, a power supply drive module, an auxiliary drive module, a signal detection module and a processing module. The power supply driving module drives the power supply coil to transmit the power signal. When the power supply driving module is in an inoperative state, the auxiliary driving module drives the reference coil to transmit the detection signal, and drives the reference coil to transmit the data request signal. The signal detection module detects the reflected signal corresponding to the data request signal on the reference coil after the data request signal. When the processing module determines that the signal detection module detects a reflected signal with data characteristics, the power supply driving module continues to be in an inoperative state. The power supply device of the present invention determines the presence of a smart card to prevent the power supply coil from transmitting a power signal and damaging the smart card.

Description

Power supply device and near-field communication device identification method for inductive power supply system

technical field

The present invention relates to the technical field of inductive power supply, in particular to a power supply device applied to an inductive power supply system and a method for identifying a near-field communication device.

Background technique

In the inductive power supply system, the power supply device uses the drive circuit to drive the power supply coil to generate resonance and then transmits electromagnetic energy, and then receives the electromagnetic energy generated by the power supply coil through resonance through the coil of the power receiving device to convert the energy into direct current. Perform power transmission.

In daily life, smart cards can communicate using technologies such as near field communication (NFC). However, most smart cards only need to receive a small amount of electromagnetic energy to actuate. When the smart card receives excessive electromagnetic energy, the chip will be damaged. If the user mistakenly inserts the smart card into the power supply coil of the power supply device of the inductive power supply system, and the power supply device is not equipped with a detection mechanism, it will easily damage the chip of the smart card when transmitting the power signal.

Therefore, how to design a new power supply device applied in an inductive power supply system and a method for identifying a near-field communication device thereof, so as to solve the above-mentioned deficiency, has become an urgent problem to be solved in the industry.

Contents of the invention

The purpose of the present invention is to prevent the smart card from being damaged by the power supply signal transmitted by the power supply coil by the power supply device judging the existence of the smart card.

Therefore, the object of the present invention is to provide a power supply device for an inductive power supply system, including: a power supply coil, a reference coil, a power supply drive module, an auxiliary drive module, a signal detection module and a processing module. The power supply driving module is electrically coupled to the power supply coil and configured to drive the power supply coil to transmit power signals. The auxiliary driving module is electrically coupled to the reference coil, and is configured to drive the reference coil to transmit a detection signal with a frequency higher than the power signal at the first time when the power supply driving module is in a non-working state, and to drive the reference coil to transmit a detection signal with a frequency higher than the power signal at the first time, and to transmit a detection signal at a second time after the first time. The time-driven reference coil transmits the data request signal. The signal detection module is electrically coupled to the reference coil and configured to detect a reflected signal on the reference coil corresponding to the data request signal at a third time after the second time of transmitting the data request signal. The processing module judges whether the signal detection module detects a reflected signal with data characteristics, and further makes the power supply driving module continue to be in an inactive state when it is judged that the signal detection module detects a reflected signal with data characteristics.

In one embodiment, the processing module determines that there is a smart card within the power supply range of the power supply coil when the signal detection module detects a reflected signal with data characteristics.

In one embodiment, the processing module does not decode the reflected signal.

In one embodiment, the signal detection module includes: a digital-to-analog converter and a comparator. A digital-to-analog converter is configured to generate a reference voltage. The comparator is electrically coupled to the digital-to-analog converter and the reference coil, configured to receive the reference voltage and the detection voltage relative to the reference coil to detect the reflected signal.

In one embodiment, the comparator is configured to control the DAC to track and lock the peak voltage with the reference voltage according to the first comparison result of the detected voltage and the reference voltage at the first time, and the DAC At the third time, the reference voltage is fine-tuned by the interval value, so that the comparator detects the reflected signal according to the second comparison result of the detection voltage and the fine-tuned reference voltage.

In one embodiment, the digital-to-analog converter fine-tunes the reference voltage upwards by a pitch value at a third time, when the second comparison result includes a portion where the detected voltage is greater than the fine-tuned reference voltage, the reflected signal has data characteristics, and when the second When the comparison result does not contain the portion whose detected voltage is greater than the trimmed reference voltage, the reflected signal does not have data characteristics.

In one embodiment, the digital-to-analog converter fine-tunes the reference voltage downwards by a pitch value at a third time, when the second comparison result includes a portion where the detected voltage is smaller than the fine-tuned reference voltage, the reflected signal has a data characteristic, and when the second comparison result 2. When the comparison result does not include the portion where the detected voltage is lower than the trimming reference voltage, the reflected signal does not have data characteristics.

In one embodiment, the power supply device further includes a voltage dividing module electrically coupled between the reference coil and the comparator, and the detection voltage received by the comparator is a divided voltage of the voltage of the reference coil.

In one embodiment, the auxiliary driving module generates the data request signal by interleaving stopping driving and starting driving the reference coil multiple times.

In one embodiment, when the processing module determines that the signal detection module does not detect the reflected signal with data characteristics, the power supply driving module is in the working state to drive the power supply coil to transmit the power signal.

Another object of the present invention is to provide a near-field communication device identification method applied to a power supply device of an inductive power supply system, including: making the auxiliary drive module electrically coupled to the reference coil electrically coupled to the power supply When the power supply driving module of the coil is in the non-working state, the reference coil is driven to transmit a detection signal with a frequency higher than the power signal at the first time, and the reference coil is driven to transmit a data request signal at a second time after the first time; the signal detection The detection module detects the reflection signal corresponding to the data request signal on the reference coil at the third time after the second time of transmitting the data request signal; and makes the processing module judge whether the signal detection module detects the reflection signal with data characteristics; and The processing module makes the power supply drive module continue to be in the non-working state when the judging signal detection module detects a reflected signal with data characteristics.

In an embodiment, the method for identifying a near field communication device further includes: making the processing module determine that there is a smart card within the power supply range of the power supply coil when it is determined that the auxiliary driving module receives a reflected signal through the reference coil.

In an embodiment, the method for identifying a near field communication device further includes: causing the processing module not to decode the reflected signal.

In one embodiment, the method for identifying a near field communication device further includes: enabling the digital-to-analog converter of the signal detection module to generate a reference voltage; and enabling the comparator of the signal detection module to receive the reference voltage and the detection voltage related to the reference coil , to detect reflected signals.

In one embodiment, the method for identifying a near field communication device further includes: enabling the comparator to control the digital-to-analog converter to track and lock the reference voltage with a feedback mechanism according to the first comparison result of the detection voltage and the reference voltage at the first time peak voltage; and causing the digital-to-analog converter to fine-tune the reference voltage at a third time, so that the comparator detects the reflected signal according to the second comparison result of the detection voltage and the fine-tuned reference voltage.

In one embodiment, the digital-to-analog converter fine-tunes the reference voltage upwards by a pitch value at a third time, when the second comparison result includes a portion where the detected voltage is greater than the fine-tuned reference voltage, the reflected signal has data characteristics, and when the second When the comparison result does not contain the portion whose detected voltage is greater than the trimmed reference voltage, the reflected signal does not have data characteristics.

In one embodiment, the digital-to-analog converter fine-tunes the reference voltage downwards by a pitch value at a third time, when the second comparison result includes a portion where the detected voltage is smaller than the fine-tuned reference voltage, the reflected signal has a data characteristic, and when the second comparison result 2. When the comparison result does not include the portion where the detected voltage is lower than the trimming reference voltage, the reflected signal does not have data characteristics.

In an embodiment, the method for identifying a near field communication device further includes: enabling the comparator to receive a divided voltage of the voltage of the reference coil as the detection voltage.

In an embodiment, the method for identifying a near field communication device further includes: causing the auxiliary driving module to alternately stop driving and start driving the reference coil multiple times to generate a data request signal.

In one embodiment, the method for identifying a near-field communication device further includes: enabling the processing module to enable the power supply driving module to be in the working state to drive the power supply coil to transmit power signal.

The advantage of applying the present invention is that the power supply device uses the auxiliary drive module to transmit high-frequency detection signals and data request signals through the reference coil, so as to determine the status of the smart card when the processing module judges that the signal detection module detects a reflected signal with data characteristics. Existence, further make the power supply drive module not work, and prevent the smart card from being damaged by the power supply signal transmitted by the power supply coil.

Description of drawings

Fig. 1 is a block diagram of an inductive power supply system in an embodiment of the present invention;

FIG. 2 is a waveform of a detection voltage received by a comparator in an embodiment of the present invention;

FIG. 3A is an enlarged waveform diagram of the detected voltage and the comparison result during T3 in one embodiment of the present invention;

Fig. 3B is another embodiment of the present invention, the detected voltage and the enlarged waveform diagram of the comparison result during T3; and

FIG. 4 is a flow chart of a method for identifying a near field communication device in an embodiment of the present invention.

【Symbol Description】

1: Inductive power supply system 100: Power supply device

102: Power supply coil 104: Reference coil

106: Power supply drive module 108: Auxiliary drive module

110: Signal detection module 112: Processing module

113A, 113B: power switch components 114A, 114B: power supply resonant capacitor

116A-116C: Detection resonance capacitor 118A, 118B: Resistor

120: Digital to Analog Converter 122: Comparator

124: Voltage divider module 130: Microcontroller

140: Power supply unit 150: Power receiving device

152: Power receiving coil 154: Load module

160: smart card 162: coil

164: Chip module 170: Prompt module

DR: Data request signal DS: Detection signal

PS: Power signal RS: Reflected signal

T1: first time T2: second time

T3: third time V1: peak voltage

V2: reference voltage after upward fine-tuning Vd: detection voltage

V3: Reference voltage after trimming down Vref: Reference voltage

Vr: Comparison Result 302: Section

300: Sections 401-411: Steps

400: Near Field Communication Device Identification Method

Detailed ways

Please refer to Figure 1. FIG. 1 is a block diagram of an inductive power supply system 1 according to an embodiment of the present invention. The inductive power supply system 1 includes a power supply device 100 and a power receiving device 150 . Wherein, the power supply device 100 is configured to generate a power signal PS, and wirelessly transmit the power signal PS to the power receiving device 150 , so as to supply power to the power receiving device 150 .

The power supply device 100 includes: a power supply coil 102 , a reference coil 104 , a power supply driving module 106 , an auxiliary driving module 108 , a signal detection module 110 and a processing module 112 .

In one embodiment, the power supply driving module 106 , the auxiliary driving module 108 , the signal detection module 110 and the processing module 112 can be integrated into a single microcontroller 130 , and the microcontroller 130 can be electrically coupled to the power supply 140 , so as to receive power from the power supply 140 and enable the internal modules to operate. However, the present invention is not limited thereto.

The power supply driving module 106 is electrically coupled to the power supply coil 102 and configured to drive the power supply coil 102 to transmit the power signal PS. In one embodiment, the power supply driving module 106 is a pulse width modulator, and outputs different oscillation frequencies under the control of the processing module 112 to drive the power supply coil 102 .

In one embodiment, the power supply device 100 further includes power supply resonant capacitors 114A and 114B and power switch components 113A and 113B, which are respectively electrically coupled between one end of the two ends of the power supply coil 102 and the power supply driving module 106 .

When the power supply driving module 106 is in the working state, it will transmit the power signal PS to the power receiving device 150 in the above manner. In one embodiment, the power receiving device 150 includes a power receiving coil 152 and a load module 154 . The receiving coil 152 is configured to receive the power signal PS and be converted by the load module 154 .

When the power supply driving module 106 is in the non-working state, it stops driving the power supply coil 102 to further stop transmitting the power signal PS to the power receiving device 150 .

The auxiliary driving module 108 is electrically coupled to the reference coil 104 and is configured to drive the reference coil 104 to transmit the detection signal DS at a first time when the power supply driving module 106 is in a non-working state, and at a second time after the first time A data request signal DR is transmitted. In one embodiment, the auxiliary driving module 108 is a pulse width modulator, and outputs different oscillation frequencies under the control of the processing module 112 to drive the reference coil 104 .

In one embodiment, the power supply device 100 further includes detection resonant capacitors 116A- 116C. The detection resonant capacitors 116A and 116B are electrically coupled between one of the two ends of the reference coil 104 and the auxiliary driving module 108 respectively, and the detection resonant capacitor 116C is electrically coupled between the detection resonant capacitors 116A and 116B. The detection resonant capacitors 116A- 116C are configured to resonate with the reference coil 104 when the auxiliary driving module 108 is driven.

In one embodiment, the power supply device 100 may optionally include a resistor 118A and a resistor 118B, which are respectively connected in series with the detection resonance capacitor 116A and the detection resonance capacitor 116B to one of the two ends of the reference coil 104 and the auxiliary driving module 108 It is configured to limit the driving current of the port of the auxiliary driving module 108 to provide protection.

In one embodiment, the power signal PS generated by the power supply driving module 106 driving the power supply coil 102 works at about 100 kHz, and the detection signal DS and the data request signal DR generated by the auxiliary driving module 108 driving the reference coil 104 are about 100 kHz. Works at 13.56 MHz or 6.78 MHz. Therefore, the working frequency band of the reference coil 104 is higher than that of the power supply coil 102 .

The signal detection module 110 is configured to detect the reflected signal RS corresponding to the data request signal DR on the reference coil 104 at a third time after the second time. The reference coil 104 overlaps the power supply coil 102 to facilitate detection of the power supply range of the power supply coil 102 . In one embodiment, the signal detection module 110 includes a digital-to-analog converter 120 and a comparator 122 .

The DAC 120 is configured to generate a reference voltage Vref. The comparator is electrically coupled to the digital-to-analog converter 120 and the reference coil 104, configured to receive the reference voltage Vref and the detection voltage Vd related to the reference coil 104, so as to use the comparison result Vr of the reference voltage Vref and the detection voltage Vd The reflected signal RS is detected.

In one embodiment, the power supply device 100 may optionally include a voltage divider module 124 electrically coupled between the reference coil 104 and the comparator 122 . The detection voltage Vd received by the comparator 122 is a divided voltage of the voltage of the reference coil 104 . However, it should be noted that, if each component of the signal detection module 110 has sufficient withstand voltage, it can also directly receive the voltage of the reference coil 104 for comparison with the reference voltage Vref without going through the voltage dividing module 124 .

The processing module 112 determines whether the signal detection module 110 detects the reflected signal RS with data characteristics, so as to determine whether there is, for example but not limited to, the smart card 160 shown in FIG. 1 within the power supply range of the power supply coil 102 . It should be noted that although in FIG. 1 , the smart card 160 is shown together with other components in the inductive power supply system 1 , actually the smart card 160 is not a part of the inductive power supply system 1 .

In one embodiment, the smart card 160 can be, for example, but not limited to, a module that communicates via near field communication technology. In one embodiment, the smart card 160 may include a coil 162 and a chip module 164 . Wherein, when the auxiliary driving module 108 drives the reference coil 104 to transmit the detection signal DS and is received by the coil 162 of the smart card 160, it will provide the smart card 160 with tiny power to drive the chip module 164 in the smart card 160, further enabling the smart card 160 to After the coil 162 receives the data request signal DR, the chip module 164 generates a modulated signal to the coil 162 according to the data request signal DR, and is reflected by the coil 162 to reflect on the reference coil 104 in the form of a reflected signal RS.

When the processing module 112 judges that the signal detection module 110 detects the reflected signal RS with data characteristics, it will keep the power supply driving module 106 in the non-working state, so as to avoid the power supply signal PS generated by the power supply driving module 106 driving the power supply coil 102 Damage to smart card 160 is caused.

In one embodiment, the power supply device 100 may optionally include a prompt module 170 . The processing module 112 can control the prompt module 170 by, for example, but not limited to displaying lights, buzzers, horns, screen displays or combinations thereof when it is determined that the signal detection module 110 detects a reflected signal RS with data characteristics. The user is prompted to remove the smart card 160 .

And when the processing module 112 judges that the signal detection module 110 has not detected the reflected signal RS with data characteristics, it will make the power supply drive module 106 in the working state to drive the power supply coil 102 to generate a power signal PS, and to the power receiving device 150 power supply.

It should be noted that, in one embodiment, since the purpose of the processing module 112 is to provide a mechanism to prevent damage to the smart card 160, it is only necessary to use the signal detection module 110 to determine whether the reflected signal RS has data characteristics, and does not The reflected signal RS needs to be decoded.

Please refer to Figure 2. FIG. 2 is a waveform of the detection voltage Vd received by the comparator 122 in an embodiment of the present invention.

The detection mechanism of the signal detection module 110 will be described in detail below with reference to FIG. 1 and FIG. 2 .

As shown in FIG. 2, in the first time T1, the auxiliary driving module 108 drives the reference coil 104 to transmit the detection signal DS, so that the comparator 122 of the signal detection module 110 can compare the detection voltage Vd and the reference voltage Vref according to the comparison result. , the digital-to-analog converter 120 is controlled by a feedback mechanism to track and lock the peak voltage V1 of the detection voltage Vd with the reference voltage Vref.

During the second time T2, the auxiliary driving module 108 drives the reference coil 104 to transmit the data request signal DR. In one embodiment, the data request signal DR is generated by interleaving stopping driving and starting driving the reference coil 104 multiple times. The data request signal DR will also be reflected in the detection voltage Vd received by the comparator 122 .

When the smart card 160 exists, as previously mentioned, the coil 162 will receive the tiny power of the detection signal to drive the chip module 164 inside the smart card 160, and further make the chip module 164 modulate on the coil 162 to pass the load reflection. In this way, the modulated signal is reflected on the reference coil 104 to form a reflected signal RS, which is reflected on the detection voltage Vd.

In more detail, the reflection signal RS will generate modulation on the amplitude of the detection voltage Vd during the third time T3, so that the detection voltage Vd will appear in a section where the amplitude rises or falls. Therefore, in the third time T3, the digital-to-analog converter 120 fine-tunes the reference voltage Vref upwards and downwards by a pitch value, so that the comparator 122 can perform the operation according to the comparison result between the detection voltage Vd and the fine-tuned reference voltage Vref. It is detected whether the reflected signal RS has data characteristics.

In one embodiment, the value of the reference voltage Vref after trimming up is V2, and the value of the reference voltage Vref after trimming down is V3.

In one embodiment, due to the difference in the location and distance of the smart card 160 , the amplitude of the detection voltage Vd may increase, or the amplitude of the detection voltage Vd may decrease. Therefore, the digital-to-analog converter 120 can fine-tune the reference voltage Vref up and down successively, or selectively set two sets of signal detection modules 110 to fine-tune one of the reference voltages Vref upwards at the same time, And let the reference voltage Vref of the other group be fine-tuned downward, so that the detection process can be accelerated.

Please refer to Figure 3A. FIG. 3A is an enlarged waveform diagram of the detection voltage Vd and the comparison result Vr during the time T3 in one embodiment of the present invention. Wherein, the detection voltage Vd is shown in lighter gray, and the comparison result Vr is shown in darker gray.

As shown in FIG. 3A , the digital-to-analog converter 120 fine-tunes the value of the reference voltage Vref up to V2 first. When there is an upward convex signal, the segment where accidental triggering occurs (ie, the comparison result of the comparator 122 includes a portion where the detection voltage Vd is greater than the reference voltage Vref) can be regarded as having data characteristics. If the entire segment is not triggered (that is, the comparison result of the comparator 122 does not include the portion where the detection voltage Vd is greater than the reference voltage Vref), it means that there is no data feature.

Therefore, in the section of FIG. 3A corresponding to the reference voltage Vref being V2, since the amplitude of the detection voltage Vd is completely smaller than V2, the existence of the reflected signal RS is not detected.

Next, the digital-to-analog converter 120 fine-tunes the value of the reference voltage Vref down to V3. When there is a concave signal, there will be occasional untriggered segments (that is, the comparison result of the comparator 122 includes a portion where the detection voltage Vd is smaller than the reference voltage Vref), which can be regarded as having data characteristics. If the entire segment is triggered (that is, the comparison result of the comparator 122 does not include the part where the detection voltage Vd is lower than the reference voltage Vref), it means that there is no data feature.

Therefore, in the section corresponding to the reference voltage Vref of V3 in FIG. 3A , the amplitude of part of the detection voltage Vd will be smaller than V3, and thus there will be part of the section 300 that is not triggered. The processing module 112 judges that the signal detection module 110 detects the reflected signal RS according to the comparison result, and further judges that the smart card 160 exists.

Please refer to Figure 3B. FIG. 3B is an amplified waveform diagram of the detection voltage Vd during the time T3 in another embodiment of the present invention. Wherein, the detection voltage Vd is shown in lighter gray, and the comparison result Vr is shown in darker gray.

As shown in FIG. 3 , the digital-to-analog converter 120 fine-tunes the value of the reference voltage Vref down to V3 first. When there is a concave signal, there will be occasional untriggered segments (that is, the comparison result of the comparator 122 includes a portion where the detection voltage Vd is smaller than the reference voltage Vref), which can be regarded as having data characteristics. If the entire segment is triggered (that is, the comparison result of the comparator 122 does not include the part where the detection voltage Vd is lower than the reference voltage Vref), it means that there is no data feature.

Therefore, in the section of FIG. 3B corresponding to the reference voltage Vref being V3, since the amplitude of the detection voltage Vd is completely larger than V3, the existence of the reflected signal RS is not detected.

Next, the digital-to-analog converter 120 fine-tunes the value of the reference voltage Vref up to V2. When there is an upward convex signal, the segment where accidental triggering occurs (ie, the comparison result of the comparator 122 includes a portion where the detection voltage Vd is greater than the reference voltage Vref) can be regarded as having data characteristics. If the entire segment is not triggered (that is, the comparison result of the comparator 122 does not include the portion where the detection voltage Vd is greater than the reference voltage Vref), it means that there is no data feature.

Therefore, in the section corresponding to the reference voltage Vref of V2 in FIG. 3B , the amplitude of part of the detection voltage Vd is greater than V2, and thus there is a section 302 that is partially triggered. The processing module 112 judges that the signal detection module 110 detects the reflected signal RS according to the comparison result, and further judges that the smart card 160 exists.

The power supply device 100 of the present invention uses the auxiliary drive module 108 to transmit the high-frequency detection signal DS and the data request signal DR through the reference coil 104, and uses the above method to fine-tune the reference voltage Vref up and down to compare with the detection voltage Vd , to achieve the function of judging whether the signal detection module 110 detects the reflected signal RS with data characteristics. When the processing module 112 judges that the signal detection module 110 detects the reflected signal RS with data characteristics, the power supply driving module 106 can be further disabled to prevent the low frequency power signal PS generated by the power supply coil 102 from damaging the smart card 160 .

Furthermore, since the data request signal DR only needs to be generated in a simulated manner, and no module for actually decoding the reflected signal RS is required, a simple circuit structure can be designed and implemented at a relatively low cost.

Please refer to Figure 4. FIG. 4 is a flow chart of a method 400 for identifying a near field communication device in an embodiment of the present invention. The near field communication device identification method 400 can be applied to the power supply device 100 applied to the inductive power supply system 1 shown in FIG. 1 . The near field communication device identification method 400 includes the following steps (it should be understood that, unless the order of the steps mentioned in this embodiment is specifically stated, the order of the steps can be adjusted according to actual needs, or even simultaneously or partially executed simultaneously).

Step 401, start detection.

Step 402 , make the auxiliary driving module 108 drive the reference coil 104 to transmit the detection signal DS with a frequency higher than the power signal PS at the first time when the power supply driving module 106 is in the non-working state.

Step 403 , make the signal detection module 110 track and lock the peak voltage V1 relative to the detection voltage Vd of the reference coil 104 according to the reference voltage Vref.

Step 404, make the auxiliary driving module 108 drive the reference coil 104 to transmit the data request signal DR at a second time.

In step 405 , the digital-to-analog converter 120 fine-tunes the value of the reference voltage Vref downward from V1 to V3 , and the signal detection module 110 compares the reference voltage Vref and the detection voltage Vd at a third time.

In step 406, the processing module 112 determines whether a reflected signal RS with data characteristics is detected. When there is a concave signal, there will be occasional untriggered segments (that is, the comparison result of the comparator 122 includes a portion where the detection voltage Vd is smaller than the reference voltage Vref), which can be regarded as having data characteristics. If the entire segment is triggered (that is, the comparison result of the comparator 122 does not include the part where the detection voltage Vd is lower than the reference voltage Vref), it means that there is no data feature.

When the reflected signal RS is not detected, in step 407, the digital-to-analog converter 120 fine-tunes the value of the reference voltage Vref upwards from V1 to V2, and the signal detection module 110 compares the reference voltage Vref with the detection signal at a third time. Measure the voltage Vd.

In step 408 , the processing module 112 determines whether a reflection signal RS with data characteristics is detected. When there is an upward convex signal, the segment where accidental triggering occurs (ie, the comparison result of the comparator 122 includes a portion where the detection voltage Vd is greater than the reference voltage Vref) can be regarded as having data characteristics. If the entire segment is not triggered (that is, the comparison result of the comparator 122 does not include the portion where the detection voltage Vd is greater than the reference voltage Vref), it means that there is no data feature.

When the processing module 112 determines that the reflected signal RS is not detected, in step 409 , the processing module 112 determines that the smart card 160 is not detected. At this time, the processing module 112 can make the power supply driving module 106 in the working state to drive the power supply coil 102 to generate the power signal PS to supply power to the power receiving device 150 .

In step 406 or step 408, when the processing module 112 determines that the reflected signal RS is detected, in step 410, the processing module 112 determines that the smart card 160 is detected, and keeps the power supply driving module 106 in the non-working state. Step 411 , the processing module 112 controls the prompt module 170 to prompt the user to remove the smart card 160 .

In one embodiment, after step 411 is completed, the process may return to step 401 to detect again, and achieve the purpose of continuous detection in a polling manner.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements within the principles of the present invention shall be included within the protection scope of the present invention.

Claims (20)

1. A power supply device applied to an inductive power supply system, characterized in that it comprises: power supply coil; reference coil; a power supply drive module, electrically coupled to the power supply coil, configured to drive the power supply coil to transmit a power signal; An auxiliary driving module, electrically coupled to the reference coil, configured to drive the reference coil to transmit a detection signal at a first time when the power supply driving module is in a non-working state, and after the first time driving the reference coil to transmit a data request signal at the second time; A signal detection module, electrically coupled to the reference coil, configured to detect a reflection corresponding to the data request signal on the reference coil at a third time after the second time of transmitting the data request signal signal; and A processing module, judging whether the signal detection module has detected the reflected signal with data characteristics, and further making the signal detection module detect the reflected signal with the data characteristics The power supply driving module continues to be in the non-working state. 2. The power supply device applied to an inductive power supply system according to claim 1, wherein when the processing module judges that the signal detection module detects the reflected signal having the data characteristic , judging that there is a smart card within the power supply range of the power supply coil. 3. The power supply device applied to an inductive power supply system according to claim 1, wherein the processing module does not decode the reflected signal. 4. The power supply device applied to an inductive power supply system according to claim 1, wherein the signal detection module comprises: a digital-to-analog converter configured to generate a reference voltage; and The comparator is electrically coupled to the digital-to-analog converter and the reference coil, configured to receive the reference voltage and a detection voltage related to the reference coil to detect the reflected signal. 5. The power supply device applied to an inductive power supply system according to claim 4, wherein the comparator is used to compare the detected voltage with the reference voltage at the first time As a result, the DAC is controlled by a feedback mechanism to track and lock the peak voltage with the reference voltage, and the DAC trims the reference voltage with a pitch value at the third time, so that the The comparator detects the reflection signal according to a second comparison result of the detection voltage and the trimmed reference voltage. 6. The power supply device applied to an inductive power supply system according to claim 5, wherein the digital-to-analog converter fine-tunes the reference voltage upwards at the third time at the interval value, when the When the second comparison result includes a part where the detection voltage is greater than the reference voltage of trimming, the reflected signal has the data characteristic, and when the second comparison result does not include the portion where the detection voltage is greater than the reference voltage of trimming When part of the reference voltage, the reflected signal does not have the data characteristic. 7. The power supply device applied to an inductive power supply system according to claim 5, wherein the digital-to-analog converter fine-tunes the reference voltage downward at the third time at the interval value, when When the second comparison result includes a part where the detection voltage is less than the reference voltage of trimming, the reflected signal has the data characteristic, and when the second comparison result does not include the portion where the detection voltage is less than the reference voltage of trimming When part of the reference voltage, the reflected signal does not have the data characteristic. 8. The power supply device applied to an inductive power supply system according to claim 4, wherein the power supply device further comprises: a voltage divider module electrically coupled between the reference coil and the comparator , the detection voltage received by the comparator is a divided voltage of the voltage of the reference coil. 9. The power supply device applied to an inductive power supply system according to claim 1, wherein the auxiliary driving module generates the data by interleaving multiple times of stopping driving and starting driving the reference coil request signal. 10. The power supply device applied to an inductive power supply system according to claim 1, wherein the processing module determines that the signal detection module has not detected the reflection with the data characteristic When the signal is activated, the power supply drive module is put in the working state to drive the power supply coil to transmit the power signal. 11. A near-field communication device identification method applied to a power supply device of an inductive power supply system, characterized in that it comprises: Make the auxiliary driving module electrically coupled to the reference coil, when the power supply driving module electrically coupled to the power supply coil is in a non-working state, drive the reference coil to transmit a detection signal with a frequency higher than that of the power supply signal at the first time , and driving the reference coil to transmit a data request signal at a second time after the first time; enabling the signal detection module to detect a reflected signal corresponding to the data request signal on the reference coil at a third time after the second time of transmitting the data request signal; and making the processing module determine whether the signal detection module detects the reflected signal with data characteristics; and When the processing module determines that the signal detection module detects the reflected signal with the data characteristic, the power supply driving module continues to be in the non-working state. 12. The near field communication device identification method according to claim 11, wherein the near field communication device identification method further comprises: When the processing module determines that the auxiliary driving module receives the reflected signal through the reference coil, it is determined that there is a smart card within the power supply range of the power supply coil. 13. The near field communication device identification method according to claim 11, wherein the near field communication device identification method further comprises: Make the processing module not decode the reflection signal. 14. The near field communication device identification method according to claim 11, wherein the near field communication device identification method further comprises: making the digital-to-analog converter of the signal detection module generate a reference voltage; and The comparator of the signal detection module receives the reference voltage and the detection voltage related to the reference coil to detect the reflected signal. 15. The near field communication device identification method according to claim 14, wherein the near field communication device identification method further comprises: making the comparator use a feedback mechanism to control the digital-to-analog converter to track and lock the peak voltage with the reference voltage according to a first comparison result between the detection voltage and the reference voltage at the first time; as well as The digital-to-analog converter fine-tunes the reference voltage at the third time, so that the comparator detects the reflected signal according to a second comparison result of the detected voltage and the fine-tuned reference voltage. 16. The method for identifying a near-field communication device according to claim 15, wherein the digital-to-analog converter fine-tunes the reference voltage upwards with a pitch value at the third time, when the second comparison result includes When the detection voltage is greater than the part of the reference voltage of trimming, the reflected signal has the data characteristic, and when the second comparison result does not include the part of the detection voltage greater than the reference voltage of trimming , the reflected signal does not have the data feature. 17. The method for identifying a near field communication device according to claim 15, wherein the digital-to-analog converter fine-tunes the reference voltage downwards at the third time with the distance value, when the second When the comparison result includes a portion where the detection voltage is less than the reference voltage for trimming, the reflected signal has the data characteristic, and when the second comparison result does not include a portion where the detection voltage is less than the reference voltage for trimming part of the voltage, the reflected signal does not have the data characteristics. 18. The near field communication device identification method according to claim 11, wherein the near field communication device identification method further comprises: The comparator is made to receive the divided voltage of the voltage of the reference coil as the detection voltage. 19. The near field communication device identification method according to claim 11, wherein the near field communication device identification method further comprises: The auxiliary driving module is interleaved to stop driving and start driving the reference coil multiple times to generate the data request signal. 20. The near field communication device identification method according to claim 11, wherein the near field communication device identification method further comprises: When the processing module judges that the signal detection module has not detected the reflected signal with the data characteristics, the power supply driving module is in the working state to drive the power supply coil to transmit the power Signal.