Supplying-end module for induction-type power supply system and signal analysis circuit therein

• US 9,831,687 B2
• Filed: 10/06/2015
• Issued: 11/28/2017
• Est. Priority Date: 02/01/2011
• Status: Active Grant

• Current Assignee: Fu Da Tong Technology Co., Ltd.
• Original Assignee: Fu Da Tong Technology Co., Ltd.
• Inventors: Tsai, Ming-Chiu, Chan, Chi-Che
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): Parries, Dru
• Application Number:
  US14/876,788
• Publication Number:
  US 20160028247A1
• Time in Patent Office: 784 Days
• Field of Search: 307104
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: G06F 1/266 Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02M 3/01 Resonant DC/DC converters
• CPC Class Codes: H02M 3/33576 having at least one active switching element at the secondary side of an isolation transformer
• CPC Class Codes: H02M 7/4815 Resonant converters H02M7/4811 and H02M7/4826 take precedence
• CPC Class Codes: H03F 2200/102 A non-specified detector of a signal envelope being used in an amplifying circuit
• CPC Class Codes: H03F 3/04 with semiconductor devices only
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A signal analysis circuit for a supplying-end module includes a first voltage divider circuit, for attenuating a coil signal of a supplying-end coil; a first amplifier circuit, for obtaining parts of the attenuated coil signal higher than a reference voltage to output a half-wave signal; a first envelope detector, for performing envelope extraction on the half-wave signal to obtain a DC signal; a second voltage divider circuit, for attenuating the half-wave signal; a second amplifier circuit, for obtaining parts of the attenuated half-wave signal higher than the DC signal to output an amplified half-wave signal; a second envelope detector, for performing envelope extraction on the amplified half-wave signal to generate an envelope signal; a coupling capacitor, for filtering out the DC component of the envelope signal; a third voltage divider circuit, for combining the AC component of the envelope signal with a DC voltage to retrieve a trigger signal.

Claims

1. A signal analysis circuit for a supplying-end module of an induction type power supply system for analyzing a coil signal on a supplying-end coil of the supplying-end module to retrieve a trigger signal, the signal analysis circuit comprising:

a first voltage divider circuit, coupled to the supplying-end coil, for attenuating the coil signal to generate an attenuated coil signal;

a first amplifier circuit, coupled to the first voltage divider circuit, for obtaining parts of the attenuated coil signal higher than a reference voltage to output a half-wave signal;

a first envelope detector circuit, coupled to the first amplifier circuit, for performing envelope extraction on the half-wave signal to obtain a direct current (DC) signal and outputting the DC signal;

a second voltage divider circuit, coupled to the first amplifier circuit, for attenuating the half-wave signal to generate an attenuated half-wave signal;

a second amplifier circuit, coupled to the first envelope detector circuit and the second voltage divider circuit, for obtaining parts of the attenuated half-wave signal higher than the DC signal to output an amplified half-wave signal;

a second envelope detector circuit, coupled to the second amplifier circuit, for performing envelope extraction on the amplified half-wave signal to generate an envelope signal and outputting the envelope signal;

a coupling capacitor, coupled to the second envelope detector circuit, for performing filtering on the envelope signal to filter out a DC component of the envelope signal and outputting an alternating current (AC) component of the envelope signal; and

a third voltage divider circuit, coupled to the coupling capacitor, for generating a DC voltage which is combined with the AC component of the envelope signal to output the trigger signal.

2. The signal analysis circuit of claim 1, further comprising:

a fourth voltage divider circuit, coupled to the first amplifier circuit, for generating the reference voltage and outputting the reference voltage to the first amplifier circuit; and

a voltage regulator capacitor, coupled to the fourth voltage divider circuit, for stabilizing the reference voltage.

3. The signal analysis circuit of claim 2, wherein a voltage attenuation ratio of the fourth voltage divider circuit attenuating its input voltage to generate the reference voltage is equal to a ratio of the first voltage divider circuit attenuating the coil signal.

4. The signal analysis circuit of claim 1, wherein the supplying-end module further comprises:

a resonant capacitor, coupled to the supplying-end coil, for performing resonance together with the supplying-end coil;

at least one power driver unit, coupled to the supplying-end coil and the resonant capacitor, for driving the supplying-end coil to generate power;

an external voltage source, for outputting a first power;

a power supplying unit, coupled to the external voltage source, for receiving the first power to generate a second power; and

a processor, coupled to the signal analysis circuit, for receiving the trigger signal and decoding the trigger signal to obtain a modulation data.

5. The signal analysis circuit of claim 4, wherein the first power is supplied to the at least one power driver unit and a fourth voltage divider circuit generating the reference voltage in the signal analysis circuit.

6. The signal analysis circuit of claim 4, wherein the second power is supplied to the processor, the first amplifier circuit, the second amplifier circuit and the third voltage divider circuit.

7. The signal analysis circuit of claim 4, wherein the power supplying unit comprises:

a buck regulator, for decreasing a voltage of the first power to generate the second power and outputting the second power; and

a voltage detector circuit, coupled to the processor, for outputting a power signal corresponding to the first power to the processor, allowing the processor to detect the voltage of the first power.

8. The signal analysis circuit of claim 4, wherein the processor further receives the DC signal outputted by the first envelope detector circuit to perform power adjustment.

9. The signal analysis circuit of claim 1, wherein the reference voltage is substantially equal to a lowest voltage in positive half cycles of the attenuated coil signal.

10. The signal analysis circuit of claim 1, wherein the first voltage divider circuit comprises:

at least one voltage divider resistor, for attenuating the coil signal and outputting the attenuated coil signal.

11. The signal analysis circuit of claim 1, wherein the first amplifier circuit comprises:

an operational amplifier, for amplifying the parts of the attenuated coil signal higher than the reference voltage, the operational amplifier comprising;

a first input terminal, for receiving the attenuated coil signal;

a second input terminal, for receiving the reference voltage; and

an output terminal, for outputting the half-wave signal;

an input resistor, coupled to the second input terminal of the operational amplifier; and

a feedback resistor, coupled between the second input terminal and the output terminal of the operational amplifier;

wherein resistance values of the input resistor and the feedback resistor determine an amplification ratio of amplifying the parts of the attenuated coil signal higher than the reference voltage.

12. The signal analysis circuit of claim 1, wherein the first envelope detector circuit comprises:

an envelope detector diode, for receiving the half-wave signal;

a filter capacitor, for filtering out a high frequency component of the half-wave signal;

a load resistor, coupled to the filter capacitor, for performing matching with the filter capacitor for discharging; and

a matching resistor, coupled between the envelope detector diode, the filter capacitor and the load resistor, for performing resistance matching.

13. The signal analysis circuit of claim 1, wherein the second voltage divider circuit comprises:

at least one voltage divider resistor, for attenuating the half-wave signal and outputting the attenuated half-wave signal.

14. The signal analysis circuit of claim 1, wherein the second amplifier circuit comprises:

an operational amplifier, for amplifying the parts of the attenuated half-wave signal higher than the DC signal, the operational amplifier comprising;

a first input terminal, for receiving the attenuated half-wave signal;

a second input terminal, for receiving the DC signal; and

an output terminal, for outputting the amplified half-wave signal;

an input resistor, coupled to the second input terminal of the operational amplifier; and

a feedback resistor, coupled between the second input terminal and the output terminal of the operational amplifier;

wherein resistance values of the input resistor and the feedback resistor determine an amplification ratio of amplifying the parts of the attenuated half-wave signal higher than the DC signal.

15. The signal analysis circuit of claim 1, wherein the second envelope detector circuit comprises:

an envelope detector diode, for receiving the amplified half-wave signal;

a filter capacitor, coupled to the envelope detector diode, for filtering out a high frequency component of the amplified half-wave signal; and

a load resistor, coupled to the filter capacitor and the envelope detector diode, for performing matching with the filter capacitor for discharging.

16. The signal analysis circuit of claim 1, wherein the third voltage divider circuit comprises:

at least one voltage divider resistor, for generating the DC voltage and outputting the trigger signal.

17. A supplying-end module for an induction type power supply system, comprising:

a supplying-end coil;

a resonant capacitor, coupled to the supplying-end coil, for performing resonance together with the supplying-end coil;

at least one power driver unit, coupled to the supplying-end coil and the resonant capacitor, for driving the supplying-end coil to generate power;

an external voltage source, for outputting a first power;

a power supplying unit, coupled to the external voltage source, for receiving the first power to generate a second power;

a signal analysis circuit, coupled to the supplying-end coil, for analyzing a coil signal on the supplying-end coil to retrieve a trigger signal, the signal analysis circuit comprising;

a first voltage divider circuit, coupled to the supplying-end coil, for attenuating the coil signal on the supplying-end coil to generate an attenuated coil signal;

a first amplifier circuit, coupled to the first voltage divider circuit, for obtaining parts of the attenuated coil signal higher than a reference voltage to output a half-wave signal;

a first envelope detector circuit, coupled to the first amplifier circuit, for performing envelope extraction on the half-wave signal to obtain a direct current (DC) signal and outputting the DC signal;

a second voltage divider circuit, coupled to the first amplifier circuit, for attenuating the half-wave signal to generate an attenuated half-wave signal;

a second amplifier circuit, coupled to the first envelope detector circuit and the second voltage divider circuit, for obtaining parts of the attenuated half-wave signal higher than the DC signal to output an amplified half-wave signal;

a second envelope detector circuit, coupled to the second amplifier circuit, for performing envelope extraction on the amplified half-wave signal to generate an envelope signal and outputting the envelope signal;

a coupling capacitor, coupled to the second envelope detector circuit, for performing filtering on the envelope signal to filter out a DC component of the envelope signal and outputting an alternating circuit (AC) component of the envelope signal; and

a third voltage divider circuit, coupled to the coupling capacitor, for generating a DC voltage which is combined with the AC component of the envelope signal to output the trigger signal; and

a processor, coupled to the signal analysis circuit, for receiving the trigger signal and decoding the trigger signal to obtain a modulation data.

18. The supplying-end module of claim 17, wherein the signal analysis circuit further comprises:

a fourth voltage divider circuit, coupled to the first amplifier circuit, for generating the reference voltage and outputting the reference voltage to the first amplifier circuit; and

a voltage regulator capacitor, coupled to the fourth voltage divider circuit, for stabilizing the reference voltage.

19. The supplying-end module of claim 18, wherein a voltage attenuation ratio of the fourth voltage divider circuit attenuating its input voltage to generate the reference voltage is equal to a ratio of the first voltage divider circuit attenuating the coil signal.

20. The supplying-end module of claim 19, wherein the first power is supplied to the at least one power driver unit and the fourth voltage divider circuit.

21. The supplying-end module of claim 17, wherein the second power is supplied to the processor, the first amplifier circuit, the second amplifier circuit and the third voltage divider circuit.

22. The supplying-end module of claim 17, wherein the power supplying unit comprises:

a buck regulator, for decreasing a voltage of the first power to generate the second power and outputting the second power; and

a voltage detector circuit, coupled to the processor, for outputting a power signal corresponding to the first power to the processor, allowing the processor to detect the voltage of the first power.

23. The supplying-end module of claim 17, wherein the processor further receives the DC signal outputted by the first envelope detector circuit to perform power adjustment.

24. The supplying-end module of claim 17, wherein the reference voltage is substantially equal to a lowest voltage in positive half cycles of the attenuated coil signal.

25. The supplying-end module of claim 17, wherein the first voltage divider circuit comprises:

at least one voltage divider resistor, for attenuating the coil signal and outputting the attenuated coil signal.

26. The supplying-end module of claim 17, wherein the first amplifier circuit comprises:

an operational amplifier, for amplifying the parts of the attenuated coil signal higher than the reference voltage, the operational amplifier comprising;

a first input terminal, for receiving the attenuated coil signal;

a second input terminal, for receiving the reference voltage; and

an output terminal, for outputting the half-wave signal;

an input resistor, coupled to the second input terminal of the operational amplifier; and

a feedback resistor, coupled between the second input terminal and the output terminal of the operational amplifier;

wherein resistance values of the input resistor and the feedback resistor determine an amplification ratio of amplifying the parts of the attenuated coil signal higher than the reference voltage.

27. The supplying-end module of claim 17, wherein the first envelope detector circuit comprises:

an envelope detector diode, for receiving the half-wave signal;

a filter capacitor, for filtering out a high frequency component of the half-wave signal;

a load resistor, coupled to the filter capacitor, for performing matching with the filter capacitor for discharging; and

a matching resistor, coupled between the envelope detector diode, the filter capacitor and the load resistor, for performing resistance matching.

28. The supplying-end module of claim 17, wherein the second voltage divider circuit comprises:

at least one voltage divider resistor, for attenuating the half-wave signal and outputting the attenuated half-wave signal.

29. The supplying-end module of claim 17, wherein the second amplifier circuit comprises:

an operational amplifier, for amplifying the parts of the attenuated half-wave signal higher than the DC signal, the operational amplifier comprising;

a first input terminal, for receiving the attenuated half-wave signal;

a second input terminal, for receiving the DC signal; and

an output terminal, for outputting the amplified half-wave signal;

an input resistor, coupled to the second input terminal of the operational amplifier; and

a feedback resistor, coupled between the second input terminal and the output terminal of the operational amplifier;

wherein resistance values of the input resistor and the feedback resistor determine an amplification ratio of amplifying the parts of the attenuated half-wave signal higher than the DC signal.

30. The supplying-end module of claim 17, wherein the second envelope detector circuit comprises:

an envelope detector diode, for receiving the amplified half-wave signal;

a filter capacitor, coupled to the envelope detector diode, for filtering out a high frequency component of the amplified half-wave signal; and

a load resistor, coupled to the filter capacitor and the envelope detector diode, for performing matching with the filter capacitor for discharging.

31. The supplying-end module of claim 17, wherein the third voltage divider circuit comprises:

at least one voltage divider resistor, for generating the DC voltage and outputting the trigger signal.