CN108880002B - Power supply device of induction type power supply system and radio frequency magnetic card identification method - Google Patents
Power supply device of induction type power supply system and radio frequency magnetic card identification method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10297—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
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Abstract
The invention discloses a power supply device applied to an induction type power supply system, which comprises: the device comprises a power supply coil, a reference coil, a power supply driving module, an auxiliary driving module, a resonant frequency measuring module, a voltage measuring module and a processing module. The power supply driving module drives the power supply coil. The auxiliary driving module drives the reference coil. The resonance frequency measuring module is used for measuring and judging the resonance frequency of the power supply coil according to the capacitance inductance parameter related to the power supply coil. The voltage measurement module tracks and locks onto the maximum oscillating voltage of the reference coil. And when the processing module judges that the resonant frequency is stable and the oscillation voltage drops beyond a specific proportion, the power supply driving module is in a non-working state. The invention can judge the existence of the radio frequency magnetic card and avoid the damage of the power supply signal generated by the power supply coil of the power supply device to the radio frequency magnetic card.
Description
Technical Field
The invention relates to the technical field of induction type power supplies, in particular to a power supply device applied to an induction type power supply system and a radio frequency magnetic card identification method thereof.
Background
In an inductive power supply system, a power supply device drives a power supply coil to generate resonance through a driving circuit, then electromagnetic energy is transmitted, and then the coil of the power receiving device receives the electromagnetic energy generated by the resonance of the power supply coil so as to convert the energy into direct current for power transmission.
In daily life, smart cards implemented by means of radio frequency magnetic cards may communicate by using technologies such as Near Field Communication (NFC). However, most rf magnetic cards can be driven with only a small amount of electromagnetic energy. When the radio frequency magnetic card receives excessive electromagnetic energy, the chip is damaged. If a user mistakenly inserts the radio frequency magnetic card into a power supply coil of a power supply device of the induction type power supply system, and the power supply device is not provided with a detection mechanism, the chip of the radio frequency magnetic card is easy to damage when the power supply signal is transmitted.
Therefore, how to design a new power supply device applied to the inductive power supply system and a radio frequency magnetic card identification method thereof to solve the above-mentioned disadvantages is an urgent problem to be solved in the industry.
Disclosure of Invention
The invention aims to provide a power supply device applied to an induction type power supply system and a radio frequency magnetic card identification method thereof, so as to judge the existence of the radio frequency magnetic card and avoid the damage of a power supply signal generated by a power supply coil to the radio frequency magnetic card.
The invention aims to provide a power supply device applied to an induction type power supply system, which comprises: the device comprises a power supply coil, a reference coil, a power supply driving module, an auxiliary driving module, a resonant frequency measuring module, a voltage measuring 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. The auxiliary driving module is electrically coupled to the reference coil and configured to drive the reference coil when the power supply driving module is in an off state. The resonant frequency measurement module is electrically coupled to the power supply coil and configured to measure a resonant frequency of the power supply coil according to a capacitive inductance parameter associated with the power supply coil. The voltage measurement module is electrically coupled to the reference coil and configured to track and lock a maximum oscillation voltage of the reference coil. And when the processing module judges that the resonant frequency is stable and the oscillation voltage drops beyond a specific proportion, the power supply driving module is in a non-working state.
In an embodiment, the processing module determines that the radio frequency magnetic card exists in the power supply range of the power supply coil when the resonant frequency is stable and the oscillation voltage drops by more than a specific ratio.
In one embodiment, the voltage measurement module comprises: a digital-to-analog converter and a comparator. The 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, and configured to receive the reference voltage and the oscillating voltage to track and lock the oscillating voltage.
In one embodiment, the comparator is configured to control the digital-to-analog converter to track and lock the oscillating voltage with the reference voltage by a feedback mechanism according to a comparison result between the oscillating voltage and the reference voltage.
In an embodiment, the power supply device further includes a voltage dividing module electrically coupled between the reference coil and the comparator, wherein the oscillation voltage received by the comparator is a divided voltage of the reference coil.
In an embodiment, the processing module makes the power supply driving module be in an operating state to drive the power supply coil to transmit the power supply signal when determining that the resonant frequency is unstable or the oscillation voltage drops by not exceeding a specific ratio.
In one embodiment, the processing module determines whether the resonant frequency is equal to the frequency lock value, and determines that the resonant frequency is stable when the resonant frequency is equal to the frequency lock value. And the processing module judges that the resonant frequency is unstable when the resonant frequency is not equal to the frequency locking value, and further updates the frequency locking value to the latest measured resonant frequency.
In one embodiment, the processing module determines whether the oscillating voltage is greater than the voltage-locking value, and retrieves the voltage-locking value of the specific proportion to set as a threshold value when the oscillating voltage is not greater than the voltage-locking value, further determines that the oscillating voltage drops beyond the specific proportion when the oscillating voltage is less than the threshold value, and determines that the oscillating voltage does not drop beyond the specific proportion when the oscillating voltage is not less than the threshold value. And the processing module judges that the oscillation voltage does not drop beyond a specific proportion when the oscillation voltage is greater than the voltage locking value, and further updates the voltage locking value to the latest measured oscillation voltage.
Another objective of the present invention is to provide a method for identifying a radio frequency magnetic card, which is applied to a power supply device of an inductive power supply system, and comprises: driving a power supply coil of a power supply device by a power supply driving module electrically coupled to the power supply coil; enabling a resonant frequency measurement module electrically coupled to the power supply coil to measure the resonant frequency of the power supply coil according to the capacitance parameter related to the power supply coil; when the power supply driving module is in an off state, the reference coil of the power supply device is driven by the auxiliary driving module which is electrically coupled with the reference coil; enabling a voltage measurement module electrically coupled to the reference coil to track and lock the maximum oscillation voltage of the reference coil; and enabling the processing module to enable the power supply driving module to be in a non-working state when the resonance frequency is judged to be stable and the oscillation voltage drops beyond a specific proportion.
In one embodiment, the rf magnetic card identification method further comprises: when the processing module judges that the resonant frequency is stable and the oscillation voltage drops beyond a specific proportion, the processing module judges that the radio frequency magnetic card exists in the power supply range of the power supply coil.
In one embodiment, the rf magnetic card identification method further comprises: causing a digital-to-analog converter of the voltage measurement module to generate a reference voltage; and enabling a comparator of the voltage measurement module to receive the reference voltage and the oscillating voltage related to the reference coil so as to track and lock the oscillating voltage.
In one embodiment, the rf magnetic card identification method further comprises: the comparator controls the digital-to-analog converter to track and lock the oscillating voltage by the reference voltage through a feedback mechanism according to the comparison result of the oscillating voltage and the reference voltage.
In one embodiment, the rf magnetic card identification method further comprises: the comparator receives the divided voltage of the reference coil as an oscillation voltage.
In one embodiment, the rf magnetic card identification method further comprises: and when the processing module judges that the resonant frequency is unstable or the drop of the oscillating voltage does not exceed a specific proportion, the power supply driving module is in a working state so as to drive the power supply coil to transmit a power supply signal.
In one embodiment, the rf magnetic card identification method further comprises: enabling the processing module to judge whether the resonant frequency is equal to the frequency locking value or not, and judging that the resonant frequency is stable when the resonant frequency is equal to the frequency locking value; and judging that the resonant frequency is unstable when the resonant frequency is not equal to the frequency locking value by the processing module, and further updating the frequency locking value to the latest measured resonant frequency.
In one embodiment, the rf magnetic card identification method further comprises: enabling the processing module to judge whether the oscillation voltage is greater than the voltage locking value, and when the oscillation voltage is not greater than the voltage locking value, capturing the voltage locking value of a specific proportion to set as a critical value, further when the oscillation voltage is less than the critical value, judging that the oscillation voltage is reduced by more than the specific proportion, and when the oscillation voltage is not less than the critical value, judging that the oscillation voltage is not reduced by more than the specific proportion; and enabling the processing module to judge that the oscillation voltage does not drop beyond a specific proportion when the oscillation voltage is greater than the voltage locking value, and further updating the voltage locking value to the latest measured oscillation voltage.
The power supply device has the advantages that the power supply device judges the existence of the radio frequency magnetic card by detecting the resonance frequency of the power supply coil and tracking and locking the maximum oscillation voltage in the oscillation voltage of the reference coil when the resonance frequency is stable and the oscillation voltage drops beyond a specific proportion, so that the power supply driving module does not work, and the power supply coil is prevented from transmitting the power to the radio frequency magnetic card to damage the radio frequency magnetic card.
Drawings
FIG. 1 is a block diagram of an inductive power supply system according to an embodiment of the present invention; and
fig. 2 is a flowchart of a radio frequency magnetic card identification method according to an embodiment of the present invention.
[ notation ] to show
1: the inductive power supply system 100: power supply device
102: power supply coil 104: reference coil
106: the power supply driving module 108: auxiliary driving module
110: resonant frequency measurement module 112: voltage measuring module
113A, 113B: power switch assemblies 114A, 114B: power supply resonance capacitor
115: processing modules 116A-116C: detecting resonant capacitor
118A, 118B: resistance 120: digital-to-analog converter
122: the comparator 124: voltage division module
130: the microcontroller 140: power supply
150: power receiving device 152: power receiving coil
154: the load module 160: radio frequency magnetic card
162: coil 164: chip module
170: a prompt module PS: coil signal
Vd: oscillation voltage Vr: comparison results
Vref: reference voltage 200: radio frequency magnetic card identification method
201-212: step (ii) of
Detailed Description
Please refer to fig. 1. Fig. 1 is a block diagram of an inductive power supply system 1 according to an embodiment of the invention. The inductive power supply system 1 includes a power supply device 100 and a power receiving device 150. The power supply device 100 is configured to generate power and wirelessly transmit the power to the power receiving device 150 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 drive module 106, an auxiliary drive module 108, a resonant frequency measurement module 110, a voltage measurement module 112, and a processing module 115.
In one embodiment, the power driving module 106, the auxiliary driving module 108, the resonant frequency measuring module 110, the voltage measuring module 112, and the processing module 115 may be integrated into a single microcontroller 130, and the microcontroller 130 may be electrically coupled to the power supply 140 to receive power from the power supply 140 and operate the modules included therein. However, the invention is not limited thereto.
The power driving module 106 is electrically coupled to the power coil 102 and configured to drive the power coil 102. In an embodiment, the power driving module 106 is a pulse width modulator (pwm) and outputs different oscillation frequencies to drive the power coil 102 under the control of the processing module 115.
In an embodiment, the power supply apparatus 100 further includes power supply resonant capacitors 114A and 114B and power switch elements 113A and 113B electrically coupled between one of two ends of the power supply coil 102 and the power supply driving module 106, respectively.
When the power supply driving module 106 is in the operating state, the power supply coil 102 is driven to supply power to the power receiving device 150. In one embodiment, the power receiving device 150 includes a power receiving coil 152 and a load module 154. The power receiving coil 152 is configured to receive power from the power supplying coil 102 and is switched by the load module 154.
When the power supply driving module 106 is in the inactive state, the driving of the power supply coil 102 is stopped to further stop the power supply to the power receiving device 150.
The auxiliary driving module 108 is electrically coupled to the reference coil 104 and configured to drive the reference coil 104 when the power driving module 106 is in an inactive state. In one embodiment, the auxiliary driving module 108 is a bandwidth modulation unit, and outputs different oscillation frequencies to drive the reference coil 104 under the control of the processing module 115.
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 resonant capacitor 116A and the detection resonant capacitor 116B between one of the two ends of the reference coil 104 and the auxiliary driving module 108, and configured to limit the driving current at the port of the auxiliary driving module 108, so as to provide a protection effect.
In one embodiment, the power coil 102 operates at approximately 100 kHz and the reference coil 104 operates at approximately 13.56 MHz or 6.78 MHz. Therefore, the operating frequency band of the reference coil 104 is high compared to the operating frequency band of the supply coil 102.
The resonant frequency measurement module 110 is electrically coupled to the power supply coil 102 and configured to determine a resonant frequency of the power supply coil 102 according to a capacitance parameter measurement associated with the power supply coil 102.
In one embodiment, the capacitive sensing parameter associated with power coil 102 includes a combination of the inductance of power coil 102 and the capacitance of power resonant capacitors 114A and 114B.
The voltage measurement module 112 is electrically coupled to the reference coil 104 and configured to track and lock the maximum oscillation voltage Vd of the reference coil 104. In one embodiment, the voltage measurement module 112 includes a digital-to-analog converter 120 and a comparator 122.
The digital-to-analog converter 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, and configured to receive the reference voltage Vref and the oscillation voltage Vd of the reference coil 104, so as to track and lock the maximum oscillation voltage Vd by a comparison result Vr between the reference voltage Vref and the oscillation voltage Vd.
In one embodiment, the power supply apparatus 100 may optionally include a voltage divider module 124 electrically coupled between the reference coil 104 and the comparator 122. The oscillation voltage Vd received by the comparator 122 is a divided voltage of the reference coil 104. It should be noted, however, that the components of the voltage measurement module 112, such as the voltage measurement module, may also receive the voltage of the reference coil 104 directly for comparison with the reference voltage Vref without passing through the voltage division module 124.
The processing module 115 determines whether the resonant frequency is stable and the oscillating voltage Vd drops beyond a certain ratio to determine whether a radio frequency magnetic card 160, such as but not limited to the one illustrated in fig. 1, exists in the power supply range of the power supply coil 102. It should be noted that although the rf magnetic card 160 is illustrated together with other components in the inductive power supply system 1 in fig. 1, the rf magnetic card 160 is not part of the inductive power supply system 1 in practice.
In one embodiment, the rf magnetic card 160 may be, for example, but not limited to, a smart card module that communicates via nfc technology. In one embodiment, the rf magnetic card 160 may include a coil 162 and a chip module 164. When the auxiliary driving module 108 drives the reference coil 104, the coil 162 receives the signal of the reference coil 104 and provides a small power to the rf magnetic card 160, so as to drive the chip module 164 in the rf magnetic card 160 to generate a modulated signal to the coil 162 and reflect the modulated signal to the reference coil 104 through the coil 162.
The determination mechanism of the processing module 115 will be described in more detail below.
First, the processing module 115 determines whether the resonant frequency is equal to a frequency locking value according to the resonant frequency detected by the resonant frequency measuring module 110. In one embodiment, the frequency lock value is a recorded lock value of the resonant frequency of the power coil 102.
In more detail, when the resonant frequency is not equal to the frequency locking value, the processing module 115 determines that the power supply coil 102 is close to a different object, which causes the resonant frequency to change and become unstable, and further updates the frequency locking value to the latest measured resonant frequency. When the resonant frequency is equal to the frequency locking value, the processing module 115 determines that the resonant frequency is stable.
It should be noted that the "equal" does not necessarily need to be 100% equal. The resonant frequency and the frequency locking value can have a reasonable range of error, and when the resonant frequency and the frequency locking value are very close, i.e. the difference is less than a specific range, the resonant frequency and the frequency locking value can be judged to be "equal".
Further, at the same resonant frequency, the processing module 115 determines whether the oscillating voltage Vd is greater than a voltage locking value by the oscillating voltage Vd detected by the voltage measuring module 112.
In one embodiment, the voltage locking value is the maximum oscillation voltage Vd captured when the power coil 102 is at the same resonant frequency. Therefore, the voltage lock value corresponds to the oscillation voltage Vd measured in the previous time with respect to the oscillation voltage Vd measured at present.
More specifically, when the oscillation voltage Vd is greater than the voltage lock value (i.e., the oscillation voltage Vd measured this time is greater than the oscillation voltage Vd measured last time), the processing module 115 determines that the oscillation voltage Vd does not decrease by more than a specific ratio, and further updates the voltage lock value to the latest oscillation voltage Vd measured.
When the oscillation voltage Vd is not greater than the voltage-locked value (i.e., the measured oscillation voltage Vd is not greater than the previously measured oscillation voltage Vd), the processing module 115 retrieves a certain percentage (e.g., but not limited to 75%) of the voltage-locked value to set the voltage-locked value as the threshold.
The processing module 115 further determines that the oscillation voltage Vd decreases beyond a specific ratio when the oscillation voltage Vd is less than the threshold, and determines that the oscillation voltage Vd does not decrease beyond the specific ratio when the oscillation voltage Vd is not less than the threshold.
Therefore, when the processing module 115 determines that the resonant frequency is stable and the oscillating voltage Vd drops beyond a certain ratio, it is determined that the rf magnetic card 160 exists within the power supply range of the power supply coil 102. At this time, the processing module 115 will make the power supply driving module 106 in an inoperative state to prevent the power supply generated by the power supply driving module 106 driving the power supply coil 102 from damaging the radio frequency magnetic card 160.
In one embodiment, the power supply device 100 may optionally include a prompt module 170. The processing module 115 may control the prompting module 170 to prompt the user to remove the rf magnetic card 160 by, for example, but not limited to, a display lamp, a buzzer, a speaker, a screen display, or a combination thereof, when determining that the rf magnetic card 160 is detected.
In one embodiment, the magnetic carrier of the RF magnetic card 160 absorbs energy from the high frequency oscillations on the reference coil 104, but does not affect the resonant frequency of the power coil 102. When there are other metal objects, they will affect the resonant frequency of the power coil 102 and absorb the energy of the high frequency oscillation on the reference coil 104. Therefore, the above-mentioned measuring and determining method can determine that there is no variation in the resonant frequency of the power supply coil 102, and then can eliminate the possibility of other metal objects, and further determine whether there is the rf magnetic card 160 according to the oscillating voltage Vd of the reference coil 104.
The power supply device 100 of the present invention detects the resonant frequency of the power supply coil 110 and tracks and locks the maximum oscillation voltage Vd of the reference coil 112, so as to determine the existence of the rf magnetic card 160 when the resonant frequency is stable and the oscillation voltage Vd drops beyond a specific ratio, and further make the power supply driving module 106 not work, thereby preventing the power supply coil 102 from transmitting power to damage the rf magnetic card 160.
Please refer to fig. 2. Fig. 2 is a flowchart of a method 200 for radio frequency magnetic card identification according to an embodiment of the present invention. The rf magnetic card identification method 200 can be applied to the power supply device 100 of the inductive power supply system 1 shown in fig. 1. The method 200 for radio frequency magnetic card identification comprises the following steps (it should be understood that the steps mentioned in the present embodiment, except for the sequence specifically mentioned, can be performed simultaneously or partially simultaneously according to the actual requirement.
In step 201, detection is started.
In step 202, the power supply coil 102 is driven by the power supply driving module 106, so that the resonant frequency measuring module 110 measures the resonant frequency of the power supply coil 102 according to the capacitive inductance parameter related to the power supply coil 102.
In one embodiment, the capacitive sensing parameter associated with power coil 102 includes a combination of the inductance of power coil 102 and the capacitance of power resonant capacitors 114A and 114B.
In step 203, the reference coil 104 is driven by the auxiliary driving module 108 when the power driving module 106 is in the off state, so that the voltage measuring module 112 tracks and locks the maximum oscillating voltage Vd of the reference coil 104.
In step 204, the processing module 115 determines whether the resonant frequency is equal to the frequency lock value. In one embodiment, the frequency lock value is a recorded lock value of the resonant frequency of the power coil 102.
When the resonant frequency is not equal to the frequency locking value, in step 205, the processing module 115 determines that there is a different object approaching the power supply coil 102, which causes the resonant frequency to change and become unstable, and further updates the frequency locking value to the latest measured resonant frequency.
Then, the processing module 115 ends the detection. In one embodiment, after step 205, the process returns to step 201 to achieve the purpose of continuous detection in a polling manner.
When the resonant frequency is equal to the frequency locking value, the processing module 115 determines that the resonant frequency is stable. It should be noted that the "equal" does not necessarily need to be 100% equal. The resonant frequency and the frequency locking value can have a reasonable range of error, and when the resonant frequency and the frequency locking value are very close, i.e. the difference is less than a specific range, the resonant frequency and the frequency locking value can be judged to be "equal". Therefore, when the processing module 115 determines that the resonant frequency is equal to the frequency lock value, it will be further determined whether the maximum oscillating voltage Vd of the reference coil 104 is greater than the voltage lock value in step 207.
In one embodiment, the voltage locking value is the maximum oscillation voltage Vd captured when the power coil 102 is at the same resonant frequency. Therefore, the voltage lock value corresponds to the oscillation voltage Vd measured in the previous time with respect to the oscillation voltage Vd measured at present.
When the oscillation voltage Vd is greater than the voltage lock value (i.e., the measured oscillation voltage Vd is greater than the previous measured oscillation voltage Vd), in step 208, the processing module 115 updates the voltage lock value to the latest measured oscillation voltage Vd.
Then, the processing module 115 ends the detection. In one embodiment, after step 205, the process returns to step 201 to achieve the purpose of continuous detection in a polling manner.
When the oscillation voltage Vd is not greater than the voltage-locked value (i.e., the measured oscillation voltage Vd is not greater than the previously measured oscillation voltage Vd), in step 209, the processing module 115 retrieves a certain percentage (e.g., but not limited to 75%) of the voltage-locked value to set the voltage-locked value as a threshold.
In step 210, the processing module 115 determines whether the oscillation voltage Vd is not less than a threshold value.
When the processing module 115 determines that the oscillation voltage Vd is not less than the threshold, it is determined that the oscillation voltage Vd does not decrease beyond a specific ratio, and it is determined in step 206 that the rf magnetic card 160 does not exist within the power supply range of the power supply coil 102, so as to end the present detection. In one embodiment, after step 206, the process returns to step 201 to achieve the purpose of continuous detection in a polling manner.
When the processing module 115 determines that the oscillation voltage Vd is smaller than the threshold, it is determined that the oscillation voltage Vd is decreased by more than a specific ratio, so that it is determined in step 211 that the rf magnetic card 160 exists within the power supply range of the power supply coil 102, and the power supply driving module 106 is in the non-operating state, so as to prevent the rf magnetic card 160 from being damaged by the power generated by the power supply driving module 106 driving the power supply coil 102.
At step 212, the processing module 115 controls the prompting module 170 to prompt the user to remove the rf magnetic card 160.
In one embodiment, after the end of step 212, the process can return to step 201 to perform detection again, so as to achieve the purpose of continuous detection in a polling manner.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (16)
1. A power supply device applied to an inductive power supply system is characterized by comprising:
a power supply coil;
a reference coil;
a power supply driving module electrically coupled to the power supply coil and configured to drive the power supply coil;
an auxiliary driving module electrically coupled to the reference coil and configured to drive the reference coil when the power supply driving module is in an off state;
a resonant frequency measurement module electrically coupled to the power supply coil and configured to measure a resonant frequency of the power supply coil according to a capacitive inductance parameter associated with the power supply coil;
a voltage measurement module electrically coupled to the reference coil and configured to track and lock a maximum oscillation voltage of the reference coil; and
and the processing module is used for enabling the power supply driving module to be in the non-working state when the resonance frequency is judged to be stable and the oscillation voltage drops by more than a specific proportion.
2. The power supply apparatus as claimed in claim 1, wherein the processing module determines that a radio frequency magnetic card exists in a power supply range of the power supply coil when the resonant frequency is stable and the oscillating voltage drops beyond the specific ratio.
3. The power supply apparatus as claimed in claim 1, wherein the voltage measuring module comprises:
a digital-to-analog converter configured to generate a reference voltage; and
a comparator electrically coupled to the digital-to-analog converter and the reference coil, configured to receive the reference voltage and the oscillating voltage, and track and lock the oscillating voltage.
4. The power supply apparatus as claimed in claim 3, wherein the comparator is configured to control the digital-to-analog converter to track and lock the oscillating voltage with the reference voltage in a feedback mechanism according to the comparison result between the oscillating voltage and the reference voltage.
5. The power supply apparatus as claimed in claim 4, further comprising a voltage divider module electrically coupled between the reference coil and the comparator, wherein the oscillating voltage received by the comparator is a divided voltage of the reference coil.
6. The power supply device as claimed in claim 1, wherein the processing module is configured to enable the power driving module to be in an operating state to drive the power coil to transmit the power signal when it is determined that the resonant frequency is unstable or the oscillating voltage drops by less than the specific ratio.
7. The power supply apparatus as claimed in claim 1, wherein the processing module determines whether the resonant frequency is equal to a frequency locking value, and determines that the resonant frequency is stable when the resonant frequency is equal to the frequency locking value;
and the processing module judges that the resonant frequency is unstable when the resonant frequency is not equal to the frequency locking value, and further updates the frequency locking value to the latest measured resonant frequency.
8. The power supply apparatus as claimed in claim 1, wherein the processing module determines whether the oscillating voltage is greater than a voltage-locking value, and retrieves the voltage-locking value of the specific proportion to set as a threshold value when the oscillating voltage is not greater than the voltage-locking value, further determines that the oscillating voltage drops beyond the specific proportion when the oscillating voltage is less than the threshold value, and determines that the oscillating voltage does not drop beyond the specific proportion when the oscillating voltage is not less than the threshold value, wherein the voltage-locking value is an oscillating voltage of the reference coil measured at a previous time;
the processing module judges that the oscillating voltage does not drop beyond the specific proportion when the oscillating voltage is greater than the voltage locking value, and further updates the voltage locking value to the latest measured oscillating voltage.
9. A radio frequency magnetic card identification method is applied to a power supply device of an induction type power supply system, and is characterized by comprising the following steps:
driving a power supply coil of the power supply device by a power supply driving module electrically coupled to the power supply coil;
causing a resonant frequency measurement module electrically coupled to the power supply coil to measure a resonant frequency of the power supply coil according to a capacitive inductance parameter associated with the power supply coil;
enabling a reference coil of the power supply device to be driven by an auxiliary driving module electrically coupled to the reference coil when the power supply driving module is in an inoperative state;
causing a voltage measurement module electrically coupled to the reference coil to track and lock onto a maximum oscillating voltage of the reference coil; and
and the processing module is used for enabling the power supply driving module to be in a non-working state when the resonance frequency is judged to be stable and the oscillation voltage drops by more than a specific proportion.
10. The rf magnetic card identification method according to claim 9, further comprising:
and when the processing module judges that the resonant frequency is stable and the oscillation voltage drops beyond the specific proportion, judging that a radio frequency magnetic card exists in the power supply range of the power supply coil.
11. The rf magnetic card identification method according to claim 9, further comprising:
causing a digital-to-analog converter of the voltage measurement module to generate a reference voltage; and
causing a comparator of the voltage measurement module to receive the reference voltage and an oscillating voltage related to the reference coil to track and lock on to the oscillating voltage.
12. The rf magnetic card identification method according to claim 11, further comprising:
and enabling the comparator to control the digital-to-analog converter to track and lock the oscillating voltage by the reference voltage through a feedback mechanism according to the comparison result of the oscillating voltage and the reference voltage.
13. The rf magnetic card identification method according to claim 12, further comprising:
and enabling the comparator to receive the divided voltage of the reference coil as the oscillation voltage.
14. The rf magnetic card identification method according to claim 9, further comprising:
and when the processing module judges that the resonant frequency is unstable or the drop of the oscillating voltage does not exceed the specific proportion, the power supply driving module is in a working state so as to drive the power supply coil to transmit a power supply signal.
15. The rf magnetic card identification method according to claim 9, further comprising:
enabling the processing module to judge whether the resonant frequency is equal to a frequency locking value or not, and judging that the resonant frequency is stable when the resonant frequency is equal to the frequency locking value; and
and when the resonant frequency is not equal to the frequency locking value, the processing module judges that the resonant frequency is unstable, and further updates the frequency locking value to the latest measured resonant frequency.
16. The rf magnetic card identification method according to claim 9, further comprising:
enabling the processing module to determine whether the oscillating voltage is greater than a voltage locking value, and when the oscillating voltage is not greater than the voltage locking value, retrieve the voltage locking value of the specific proportion to set as a threshold value, further when the oscillating voltage is less than the threshold value, determine that the oscillating voltage drops beyond the specific proportion, and when the oscillating voltage is not less than the threshold value, determine that the oscillating voltage does not drop beyond the specific proportion, wherein the voltage locking value is an oscillating voltage of the reference coil measured at a previous time; and
and enabling the processing module to judge that the oscillation voltage does not drop beyond the specific proportion when the oscillation voltage is greater than the voltage locking value, and further updating the voltage locking value to the latest measured oscillation voltage.
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|---|---|---|---|
| TW107124689 | 2018-07-17 | ||
| TW107124689A TWI661445B (en) | 2018-07-17 | 2018-07-17 | Power-supply device of induction type power supply system and rf magnetic card identification method of the same |
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| CN108880002A CN108880002A (en) | 2018-11-23 |
| CN108880002B true CN108880002B (en) | 2021-09-10 |
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| CN116526657B (en) * | 2023-06-29 | 2023-10-31 | 厦门普为光电科技有限公司 | Lighting device power supply system with switching mechanism |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010097869A1 (en) * | 2009-02-26 | 2010-09-02 | パナソニック株式会社 | Charger, electronic apparatus, and system for charging electronic apparatus |
| CN102457109A (en) * | 2010-11-04 | 2012-05-16 | 翰林Postech株式会社 | Device and method for controlling wireless power signal in wireless power transmission device |
| CN104065172A (en) * | 2013-03-22 | 2014-09-24 | 株式会社东芝 | Wireless Power Supply System, Power Reception Controlling Apparatus And Power Transmission Controlling Apparatus |
| CN104143862A (en) * | 2013-05-09 | 2014-11-12 | 佳能株式会社 | Power supply apparatus, power supply method, electronic apparatus, and power receiving method |
| CN106094041A (en) * | 2016-05-13 | 2016-11-09 | 富达通科技股份有限公司 | Induction type power supply and metal foreign matter detection method thereof |
| CN106612076A (en) * | 2015-10-22 | 2017-05-03 | 产晶积体电路股份有限公司 | A multifunctional power converter |
| WO2017194338A1 (en) * | 2016-05-10 | 2017-11-16 | Koninklijke Philips N.V. | Foreign object detection in a wireless power transfer system |
| CN107591898A (en) * | 2016-07-07 | 2018-01-16 | 立锜科技股份有限公司 | Resonance type wireless power supply transtation mission circuit and its control method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9059590B2 (en) * | 2013-02-26 | 2015-06-16 | Bby Solutions, Inc. | Universal battery charger system and method |
| JP6087434B2 (en) * | 2013-06-19 | 2017-03-01 | ルネサスエレクトロニクス株式会社 | Power transmission device, non-contact power feeding system, and control method |
-
2018
- 2018-07-17 TW TW107124689A patent/TWI661445B/en active
- 2018-08-09 CN CN201810902936.1A patent/CN108880002B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010097869A1 (en) * | 2009-02-26 | 2010-09-02 | パナソニック株式会社 | Charger, electronic apparatus, and system for charging electronic apparatus |
| CN102457109A (en) * | 2010-11-04 | 2012-05-16 | 翰林Postech株式会社 | Device and method for controlling wireless power signal in wireless power transmission device |
| CN104065172A (en) * | 2013-03-22 | 2014-09-24 | 株式会社东芝 | Wireless Power Supply System, Power Reception Controlling Apparatus And Power Transmission Controlling Apparatus |
| CN104143862A (en) * | 2013-05-09 | 2014-11-12 | 佳能株式会社 | Power supply apparatus, power supply method, electronic apparatus, and power receiving method |
| CN106612076A (en) * | 2015-10-22 | 2017-05-03 | 产晶积体电路股份有限公司 | A multifunctional power converter |
| WO2017194338A1 (en) * | 2016-05-10 | 2017-11-16 | Koninklijke Philips N.V. | Foreign object detection in a wireless power transfer system |
| CN106094041A (en) * | 2016-05-13 | 2016-11-09 | 富达通科技股份有限公司 | Induction type power supply and metal foreign matter detection method thereof |
| CN107591898A (en) * | 2016-07-07 | 2018-01-16 | 立锜科技股份有限公司 | Resonance type wireless power supply transtation mission circuit and its control method |
Non-Patent Citations (2)
| Title |
|---|
| Performance Analysis of Polymer based Antenna-Coils for RFID;S. Cicho等;《2nd International IEEE Conference on Polymers and Adhesives in Microelectronics and Photonics. POLYTRONIC 2002. Conference Proceedings (Cat. No.02EX599)》;20020807;第120-124页 * |
| 小功率磁耦合谐振式无线电能传输装置研究;周俊巍等;《电工技术学报》;20151231;第30卷;第175-180页 * |
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|---|---|
| TWI661445B (en) | 2019-06-01 |
| CN108880002A (en) | 2018-11-23 |
| TW201839786A (en) | 2018-11-01 |
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