METHOD OF AUTOMATICALLY ADJUSTING DETERMINATION VOLTAGE AND VOLTAGE ADJUSTING DEVICE THEREOF

• US 20130342027A1
• Filed: 09/04/2013
• Published: 12/26/2013
• 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
• Granted Patent: US 9,628,147 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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: H02M 3/01 Resonant DC/DC converters
• CPC Class Codes: H02M 3/33573 Full-bridge at primary side of an isolation transformer
• CPC Class Codes: H02M 3/33576 having at least one active switching element at the secondary side of an isolation transformer
• CPC Class Codes: H04B 5/26 using coils
• 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 method of automatically adjusting a determination voltage used in an induction type power supply system includes detecting an output voltage of a signal analysis circuit; adding a first threshold value to the output voltage to generate a first determination voltage and subtracting a second threshold value from the output voltage to generate a second determination voltage; outputting the first determination voltage as a reference voltage; and comparing a trigger signal of the signal analysis circuit and the reference voltage, in order to generate a first data code; wherein when the step of comparing the trigger signal of the signal analysis circuit and the reference voltage in order to generate the first data code fails, the method further includes outputting the second determination voltage as the reference voltage and comparing the trigger signal of the signal analysis circuit and the reference voltage, in order to generate a second data code.

Claims

1. A method of automatically adjusting a determination voltage used in an induction type power supply system, comprising:

detecting an output voltage of a signal analysis circuit;

adding a first threshold value to the output voltage to generate a first determination voltage and subtracting a second threshold value from the output voltage to generate a second determination voltage;

outputting the first determination voltage as a reference voltage; and

comparing a trigger signal of the signal analysis circuit and the reference voltage, in order to generate a first data code;

wherein when the step of comparing the trigger signal of the signal analysis circuit and the reference voltage in order to generate the first data code fails, the method further comprises;

outputting the second determination voltage instead of the first determination voltage as the reference voltage, and comparing the trigger signal of the signal analysis circuit and the reference voltage, in order to generate a second data code.

2. The method of claim 1, further comprising detecting a maximum value of the trigger signal of the signal analysis circuit, in order to obtain strength of the trigger signal.

3. The method of claim 1, wherein the step of detecting the output voltage of the signal analysis circuit is performed during a period that a power receiving device of the induction type power supply system is not transmitting signals.

4. The method of claim 1, wherein the signal analysis circuit clamps an input signal of the signal analysis circuit to a higher voltage level, in order to increase strength of the trigger signal, which in turn increases a possibility of successfully generating the first data code.

5. A determination voltage adjustment device used in an induction type power supply system, comprising:

a detector, for detecting an output voltage of a signal analysis circuit;

an adjustment microprocessor, electrically connected to the detector, for adding a first threshold value to the output voltage to generate a first determination voltage and subtracting a second threshold value from the output voltage to generate a second determination voltage;

an output device, electrically connected to the adjustment microprocessor, for outputting the first determination voltage as a reference voltage; and

a comparator, having two input terminals electrically connected to the detector and the output device respectively and an output terminal electrically connected to the adjustment microprocessor, for comparing a trigger signal of the signal analysis circuit and the reference voltage, in order to generate a first data code;

wherein when the comparator fails to generate the first data code by comparing the trigger signal of the signal analysis circuit and the reference voltage, the output device outputs the second determination voltage instead of the first determination voltage as the reference voltage, and the comparator compares the trigger signal of the signal analysis circuit and the reference voltage, in order to generate a second data code.

6. The determination voltage adjustment device of claim 5, wherein the detector further detects a maximum value of the trigger signal of the signal analysis circuit, in order to obtain strength of the trigger signal.

7. The determination voltage adjustment device of claim 5, wherein the detector detects the output voltage of the signal analysis circuit during a period that a power receiving device of the induction type power supply system is not transmitting signals.

8. The determination voltage adjustment device of claim 5, wherein the signal analysis circuit comprises a clamping circuit, for clamping an input signal of the signal analysis circuit to a higher voltage level, in order to increase strength of the trigger signal, which in turn increases a possibility of successfully generating the first data code.

9. The determination voltage adjustment device of claim 5, wherein the detector comprises an analog-to-digital converter for converting the trigger signal into a signal in digital form, in order to be outputted to the adjustment microprocessor for follow-up interpretation and processing.

10. The determination voltage adjustment device of claim 5, wherein the output device comprises a digital-to-analog converter for converting the first determination voltage or the second determination voltage outputted by the adjustment microprocessor into the reference voltage in analog form, in order to be outputted to the comparator for follow-up interpretation and processing.

11. A rectifier and signal feedback circuit used in a receiving-end module of an induction type power supply system, for rectifying power received by a receiving-end coil of the receiving-end module and modulating a feedback signal, the rectifier and signal feedback circuit comprising:

a first high-side diode and a first low-side switch, electrically connected to a first terminal of the receiving-end coil, for performing rectification;

a second high-side diode and a second low-side switch, electrically connected to a second terminal of the receiving-end coil, for performing rectification;

a first resistor and a second resistor, electrically connected to the first terminal and the second terminal of the receiving-end coil respectively, for modulating the feedback signal;

a third switch and a fourth switch, each comprising a drain electrically connected to the first resistor and the second resistor respectively, a source electrically connected to a ground terminal, and a gate electrically connected to a receiving-end microprocessor, for controlling the first resistor and the second resistor to modulate the feedback signal and controlling the first low-side switch and the second low-side switch to perform rectification;

a third resistor, electrically connected between the first terminal of the receiving-end coil and a gate of the second low-side switch, for protecting the second low-side switch in order to prevent the second low-side switch from being burnt, and providing rectification switching signals for the second low-side switch;

a fourth resistor, electrically connected between the second terminal of the receiving-end coil and a gate of the first low-side switch, for protecting the first low-side switch in order to prevent the first low-side switch from being burnt, and providing rectification switching signals for the first low-side switch;

a first zener diode, electrically connected between the gate of the first low-side switch and the ground terminal, for limiting a voltage of the gate of the first low-side switch, in order to prevent the first low-side switch from being burnt;

a second zener diode, electrically connected between the gate of the second low-side switch and the ground terminal, for limiting a voltage of the gate of the second low-side switch, in order to prevent the second low-side switch from being burnt;

a first control diode, electrically connected between the gate of the first low-side switch and the third switch, for providing a conducting path from the gate of the first low-side switch to the ground terminal, and preventing signals of other rectification cycles from flowing in reverse from the receiving-end coil to the gate of the first low-side switch; and

a second control diode, electrically connected between the gate of the second low-side switch and the fourth switch, for providing a conducting path from the gate of the second low-side switch to the ground terminal, and preventing signals of other rectification cycles from flowing in reverse from the receiving-end coil to the gate of the second low-side switch.

12. The rectifier and signal feedback circuit of claim 11, wherein the first resistor and the second resistor have a first resistance value, and the first resistance value is small enough for the first resistor and the second resistor to modulate the feedback signal when the receiving-end module has no load.

13. The rectifier and signal feedback circuit of claim 11, wherein the third resistor and the fourth resistor have a second resistance value, and the second resistance value is large enough for the third resistor and the fourth resistor to protect the first low-side switch and the second low-side switch, in order to prevent the first low-side switch and the second low-side switch from being burnt.

14. An induction type power supply system, comprising:

a supplying-end module, comprising;

a supplying-end coil, for supplying power and transmitting signals;

a power driver unit, electrically connected to the supplying-end coil, for driving the supplying-end coil;

a coil voltage detection circuit, electrically connected to the supplying-end coil, for detecting a voltage of the supplying-end coil;

a signal analysis circuit, electrically connected to the supplying-end coil, for detecting and analyzing data signals of the supplying-end coil;

a supplying-end microprocessor, electrically connected to the power driver unit and the coil voltage detection circuit, for controlling operations of the supplying-end module;

a display unit, electrically connected to the supplying-end microprocessor, for displaying an operation status of the supplying-end module;

a power supplying unit, electrically connected to the power driver unit and the supplying-end microprocessor, for receiving power from a power source in order to provide power to be transmitted by the supplying-end coil and power required for operations of the supplying-end module; and

a determination voltage adjustment device, electrically connected to the supplying-end microprocessor and the signal analysis circuit, the determination voltage adjustment device comprising;

a detector, for detecting an output voltage of the signal analysis circuit;

an adjustment microprocessor, electrically connected to the detector, for adding a first threshold value to the output voltage to generate a first determination voltage and subtracting a second threshold value from the output voltage to generate a second determination voltage;

an output device, electrically connected to the adjustment microprocessor, for outputting the first determination voltage as a reference voltage; and

a comparator, of which two input terminals are electrically connected to the detector and the output device respectively and an output terminal is electrically connected to the adjustment microprocessor, for comparing a trigger signal of the signal analysis circuit and the reference voltage, in order to generate a first data code;

wherein when the comparator fails to generate the first data code by comparing the trigger signal of the signal analysis circuit and the reference voltage, the output device outputs the second determination voltage instead of the first determination voltage as the reference voltage, and the comparator compares the trigger signal of the signal analysis circuit and the reference voltage in order to generate a second data code; and

a receiving-end module, comprising;

a receiving-end coil, for receiving power from the supplying-end coil and transmitting a feedback signal to the supplying-end module;

a voltage detection circuit, electrically connected to the receiving-end coil, for detecting a voltage of the receiving-end coil;

a receiving-end microprocessor, electrically connected to the voltage detection circuit, for controlling operations of the receiving-end module;

a rectifier and signal feedback circuit, electrically connected to the receiving-end coil and the receiving-end microprocessor, for rectifying power received by the receiving-end coil and modulating the feedback signal, the rectifier and signal feedback circuit comprising;

a first high-side diode and a first low-side switch, electrically connected to a first terminal of the receiving-end coil, for performing rectification;

a second high-side diode and a second low-side switch, electrically connected to a second terminal of the receiving-end coil, for performing rectification;

a first resistor and a second resistor, electrically connected to the first terminal and the second terminal of the receiving-end coil respectively, for modulating the feedback signal;

a third switch and a fourth switch, each comprising a drain electrically connected to the first resistor and the second resistor respectively, a source electrically connected to a ground terminal, and a gate electrically connected to the receiving-end microprocessor, for controlling the first resistor and the second resistor to modulate the feedback signal and controlling the first low-side switch and the second low-side switch to perform rectification;

a third resistor, electrically connected between the first terminal of the receiving-end coil and a gate of the second low-side switch, for protecting the second low-side switch in order to prevent the second low-side switch from being burnt, and providing rectification switching signals for the second low-side switch;

a fourth resistor, electrically connected between the second terminal of the receiving-end coil and a gate of the first low-side switch, for protecting the first low-side switch in order to prevent the first low-side switch from being burnt, and providing rectification switching signals for the first low-side switch;

a first zener diode, electrically connected between the gate of the first low-side switch and the ground terminal, for limiting a voltage of the gate of the first low-side switch, in order to prevent the first low-side switch from being burnt;

a second zener diode, electrically connected between the gate of the second low-side switch and the ground terminal, for limiting a voltage of the gate of the second low-side switch, in order to prevent the second low-side switch from being burnt;

a first control diode, electrically connected between the gate of the first low-side switch and the third switch, for providing a conducting path from the gate of the first low-side switch to the ground terminal, and preventing signals of other rectification cycles from flowing in reverse from the receiving-end coil to the gate of the first low-side switch; and

a second control diode, electrically connected between the gate of the second low-side switch and the fourth switch, for providing a conducting path from the gate of the second low-side switch to the ground terminal, and preventing signals of other rectification cycles from flowing in reverse from the receiving-end coil to the gate of the second low-side switch;

a protection circuit breaker, electrically connected to the receiving-end coil and the receiving-end microprocessor, for preventing the receiving-end module and a load element from being burnt; and

a voltage stabilizer circuit, electrically connected to the receiving-end coil, the protection circuit breaker and the receiving-end microprocessor, for receiving power from the receiving-end coil, in order to output a stable voltage to a load terminal.

15. The induction type power supply system of claim 14, wherein the detector further detects a maximum value of the trigger signal of the signal analysis circuit, in order to obtain strength of the trigger signal.

16. The induction type power supply system of claim 14, wherein the detector detects the output voltage of the signal analysis circuit during a period that the power receiving device is not transmitting signals.

17. The induction type power supply system of claim 14, wherein the signal analysis circuit comprises a clamping circuit, for clamping an input signal of the signal analysis circuit to a higher voltage level, in order to increase strength of the trigger signal, which in turn increases a possibility of successfully generating the first data code.

18. The induction type power supply system of claim 14, wherein the detector comprises an analog-to-digital converter for converting the trigger signal into a signal in digital form, in order to be outputted to the adjustment microprocessor for follow-up interpretation and processing.

19. The induction type power supply system of claim 14, wherein the output device comprises a digital-to-analog converter for converting the first determination voltage or the second determination voltage outputted by the adjustment microprocessor into the reference voltage in analog form, in order to be outputted to the comparator for follow-up interpretation and processing.

20. The induction type power supply system of claim 14, wherein the first resistor and the second resistor have a first resistance value, and the first resistance value is small enough for the first resistor and the second resistor to modulate the feedback signal when the receiving-end module has no load.

21. The induction type power supply system of claim 14, wherein the third resistor and the fourth resistor have a second resistance value, and the second resistance value is large enough for the third resistor and the fourth resistor to protect the first low-side switch and the second low-side switch, in order to prevent the first low-side switch and the second low-side switch from being burnt.