TWI472897B - Method and Device of Automatically Adjusting Determination Voltage And Induction Type Power Supply System Thereof - Google Patents

Description

Method and device for automatically adjusting voltage level and inductive power supply thereof

The invention relates to a method for automatically adjusting voltage level of an inductive power supply and a voltage level adjusting device thereof, in particular to amplifying a feedback signal intensity in an inductive power supply to improve signal discrimination sensitivity The automatic voltage regulation method and its voltage level adjustment device.

In the inductive power supply, in order to operate safely, it is necessary to confirm that the power supply coil is the correct power receiving device at the supply end, and the power transmission is performed only when the power can be received, in order to recognize whether the power is correctly received at the power supply end. The device needs to be identified by data transmission. The transmission of the data code is generated by the power supply terminal driving the power supply coil to generate resonance, transmitting electromagnetic energy to the power receiving end for power transmission, and when receiving power at the power receiving end, the impedance state on the receiving coil can be changed by the signal modulation technique, and then The carrier amplitude variation on the power supply coil is changed by feedback. Then, through the circuit processing, the signal change on the power supply coil can be converted into digital information and transmitted to the power supply terminal microprocessor for interpretation. However, the variation in carrier amplitude on the power supply coil is rather weak and susceptible to noise, and is not easily removed and converted into accurate digital logic signals. In the prior art, the industry proposed to use a multi-layer operational amplifier combined into an active band pass filter, a cross-connect coupler, and a voltage comparator for signal conversion, which is complicated in design and difficult to produce. In the Republic of China Patent Publication No. 201134053, a simple filter circuit is realized which combines a resistor and a capacitor, and can input a signal to a voltage comparator, compare it with a predetermined level voltage, and then convert and output a digital signal. This is a A circuit that is simple and easy to produce.

However, the prior art still has shortcomings: First, the carrier signal on the power supply coil is transmitted to the signal analysis circuit for half-wave rectification processing, that is, the signal variation has been attenuated by half, and in the circuit without signal amplification, The small signal recognition capability is poor. Second, the reference voltage of the comparator is the reference voltage level generated by the two voltage dividing resistors connected to the power supply terminal and the ground terminal, and the resistance component itself has an error during production, which may cause setting discrimination. The accuracy of the level is deviated. Under the consideration of production yield, the reference voltage and the normal voltage of the signal cannot be set too close to avoid the signal error output due to component error, and the reference voltage cannot be set close to The normal voltage causes the signal discrimination sensitivity to be poor. Third, in the prior art, in order to trigger the discrimination in the positive phase and the reverse phase of the signal, two comparators are needed and two reference voltages are set for the up and down triggering of the signal. And because of the error of the component, it is more difficult to produce and set; Fourth, in the prior art, it can only be judged from the receiving end. The signal is triggered and parsed into a digital data code, but the data signal strength cannot be interpreted. In the case of weak data signals, the energy cannot be increased in time to improve the signal strength. In the case where the coil coupling is not good, the signal transmission capability is easily lost. . In view of this, the prior art has been improved.

Therefore, the main object of the present invention is to provide an automatic adjustment voltage capable of amplifying the feedback signal strength in an inductive power supply and transmitting a reference voltage of the comparator through a highly accurate circuit architecture to improve signal discrimination sensitivity. Level method and its voltage level adjusting device. The automatic adjustment voltage level method and the voltage level adjustment device can automatically adjust the comparator to use the positive or negative phase trigger signal for interpretation, and can adjust the magnitude of the reference voltage.

The invention discloses a method for automatically adjusting a voltage level for an inductive power supply. The method includes detecting an output voltage of a signal analysis circuit; adding a first threshold to the output voltage to generate a first discrimination level, and subtracting the output voltage from a second threshold to generate a a second discriminating level; outputting the first discriminating level as a reference voltage; and comparing the signal One of the analytic circuits triggers the signal and the reference voltage to generate a first data code; wherein, when the step of comparing the trigger signal of the signal analysis circuit and the reference voltage to generate the first data code fails, The method further includes outputting the second discrimination level as the reference voltage, and comparing the trigger signal of the signal analysis circuit and the reference voltage to generate a second data code.

The invention further discloses a voltage level adjusting device for an inductive power supply. The voltage level adjusting device includes a detecting device for detecting an output voltage of a signal analyzing circuit, and an adjusting microprocessor electrically connected to the detecting device for adding the output voltage to the first a threshold value to generate a first discrimination level, and subtracting a second threshold value from the output voltage to generate a second discrimination level; an output device electrically connected to the adjustment microprocessor for outputting The first discriminating level is used as a reference voltage; and a comparator includes two input terminals electrically connected to the detecting device and the output device, and an output terminal electrically connected to the adjusting microprocessor. And comparing the trigger signal and the reference voltage of the signal analysis circuit to generate a first data code; wherein, when the comparator is unable to compare the trigger signal of the signal analysis circuit and the reference voltage, the first When the data code is used, the output device outputs the second discrimination level as the reference voltage, and the comparator compares the trigger signal of the signal analysis circuit with the reference voltage to generate a second Bin code.

The present invention further discloses a rectification and signal feedback circuit for a power receiving module of an inductive power supply for rectifying and modulating a power supply received by a power receiving coil of the power receiving module. The rectifying and signal feedback circuit includes a first upper bridge diode and a first lower bridge switching element electrically connected to one of the first ends of the power receiving coil for rectification; and a second upper bridge diode And a second lower bridge switching element electrically connected to one of the second ends of the power receiving coil for rectification; a first resistor and a second resistor are electrically connected to the first end of the power receiving coil And the second end is configured to modulate the feedback signal; a third switching element and a fourth switching element each include a drain electrically connected to the first resistor and the second resistor, a source electrical Connected to a ground end, and a gate is electrically connected to a powered microprocessor for controlling the first resistor and the second resistor to modulate the feedback signal, and controlling the first lower bridge switching element and the second The lower bridge switching element is rectified; a third resistor is electrically connected between the first end of the power receiving coil and one of the gates of the second lower bridge switching element for protecting the second lower bridge switching element Avoiding burning, and providing a rectification switching signal to the second lower bridge switching element; a fourth resistor electrically connected between the second end of the power receiving coil and one of the gates of the first lower bridge switching element, The first lower bridge switching element is used to protect the first lower bridge switching element from the first lower bridge switching element; and the first Zener diode is electrically connected to the first lower bridge switching element. The gate and the ground end are used to limit the voltage of the gate of the first lower bridge switching element to avoid burning thereof; a second Zener diode is electrically connected to the second lower bridge Between the gate of the switching element and the ground end, used to limit the a voltage of the gate of the lower switching element to avoid burning thereof; a first control diode electrically connected between the gate of the first lower bridge switching element and the third switching element Providing a conduction path of the gate of the first lower bridge switching element to the ground end, and preventing another rectification period signal from being poured back by the power receiving coil to the gate of the first lower bridge switching element; and a second control a pole body electrically connected between the gate of the second lower bridge switching element and the fourth switching element for providing a conduction path of the gate of the second lower bridge switching element to the ground end and preventing Another rectification period signal is inverted by the power receiving coil back to the gate of the second lower bridge switching element.

The invention further discloses an inductive power supply device comprising a power supply module and a power receiving module. The power supply module includes a power supply coil for transmitting power and transmitting signals; a power supply driving unit electrically connected to the power supply coil for driving the power supply coil; and a voltage detecting circuit electrically connected to the power supply a coil for detecting the voltage of the power supply coil; a signal analysis circuit electrically connected to the power supply coil for detecting and analyzing the data signal on the power supply coil; and a power supply microprocessor electrically connected to the The power supply driving unit and the voltage detecting circuit are used to control various operations of the power supply module; a display unit is electrically connected to the power supply microprocessor for displaying the operating state of the power supply module; Electrically connected to the power supply driving unit and the supply An electric microprocessor for receiving an external voltage source to provide a power source sent by the power supply coil and providing a power source required for the power supply module to operate; and a voltage level adjusting device electrically connected to the power supply Microprocessor and the signal analysis circuit. The voltage level adjusting device includes a detecting device for detecting an output voltage of a signal analyzing circuit, and an adjusting microprocessor electrically connected to the detecting device for adding the output voltage to the first a threshold value to generate a first discrimination level, and subtracting a second threshold value from the output voltage to generate a second discrimination level; an output device electrically connected to the adjustment microprocessor for outputting The first discriminating level is used as a reference voltage; and a comparator includes two input terminals electrically connected to the detecting device and the output device, and an output terminal electrically connected to the adjusting microprocessor. And comparing the trigger signal and the reference voltage of the signal analysis circuit to generate a first data code; wherein, when the comparator is unable to compare the trigger signal of the signal analysis circuit and the reference voltage, the first When the data code is used, the output device outputs the second discrimination level as the reference voltage, and the comparator compares the trigger signal of the signal analysis circuit with the reference voltage to generate a second Bin code. The power receiving module includes a power receiving coil for receiving power from the power feeding coil and generating a feedback signal to the power supply module. A voltage detecting circuit is electrically connected to the power receiving coil for detecting the power receiving coil. a voltage-receiving microprocessor electrically connected to the voltage detecting circuit for controlling various operations of the power receiving module; a rectifying and signal feedback circuit electrically connected to the power receiving coil and the power receiving micro-processing The device is configured to rectify and modulate the power supply received by the power receiving coil; and a circuit breaker protection circuit electrically connected to the power receiving coil and the power receiving microprocessor to prevent the power receiving module and the load component from being burnt And a voltage stabilizing circuit electrically connected to the power receiving coil, the circuit breaker protection circuit and the power receiving microprocessor, for receiving power from the power receiving coil to output a stable voltage to a load end. The rectifying and signal feedback circuit includes a first upper bridge diode and a first lower bridge switching element electrically connected to one of the first ends of the power receiving coil for rectification; and a second upper bridge The pole body and a second lower bridge switching element are electrically connected to one of the second ends of the power receiving coil for rectification; a first resistor and a second resistor are electrically connected to the power receiving coil One end and the second end are used to modulate the feedback signal; a third switching element and a fourth switching element, each The self-contained one is electrically connected to the first resistor and the second resistor, the source is electrically connected to a ground, and a gate is electrically connected to the powered microprocessor to control the first a resistor and the second resistor modulate the feedback signal, and control the first lower bridge switching element and the second lower bridge switching element to perform rectification; a third resistor electrically connected to the first end of the power receiving coil and Between the gates of the second lower-bridge switching element, the second lower-bridge switching element is used to protect the second lower-bridge switching element from burning and providing a switching rectifier switching signal; a fourth resistor electrically connected to the power-receiving coil The second end and the gate of one of the first lower bridge switching elements are used to protect the first lower bridge switching element from burning and provide a switching rectifier switching signal; a first Zener diode, electrically connected Between the gate of the first lower bridge switching element and the ground end, used to limit the voltage of the gate of the first lower bridge switching element to avoid burning thereof; a second Zener diode, Electrically connected to the gate of the second lower bridge switching element and Between the ground ends, the voltage of the gate of the second lower bridge switching element is limited to avoid burning; a first control diode is electrically connected to the gate of the first lower bridge switching element And the third switching element is configured to provide a conduction path of the gate of the first lower bridge switching element to the ground end, and prevent another rectification period signal from being poured back by the power receiving coil to the second lower bridge switching element And the second control diode is electrically connected between the gate of the second lower bridge switching element and the fourth switching element for providing the second lower bridge switching element The gate conducts a path to the ground and prevents another rectification period signal from being poured back by the power receiving coil to the gate of the second lower bridge switching element.

10‧‧‧Power supply module

11‧‧‧Powered microprocessor

12A, 12B‧‧‧Power supply unit

121A, 121B‧‧‧ drive

123A, 123B‧‧‧Upper bridge switching components

124A, 124B‧‧‧ lower bridge switching components

13‧‧‧Signal analysis circuit

131‧‧‧Clamp circuit

R1~R6‧‧‧ resistor

C1~C5‧‧‧ capacitor

D1, D2‧‧‧ diode

14‧‧‧Voltage detection circuit

15‧‧‧Display unit

16‧‧‧Power supply unit

161‧‧‧External voltage source

162, 163‧‧ ‧ voltage divider resistor

164‧‧‧DC buck

17‧‧‧Resonance capacitor

171‧‧‧Power supply coil

18‧‧‧Voltage level adjustment device

181‧‧‧ Output device

182‧‧‧ comparator

183‧‧‧Detection device

184‧‧‧Adjusting the microprocessor

20‧‧‧Power receiving module

21‧‧‧Powered microprocessor

22‧‧‧Voltage detection circuit

221A, 221B‧‧‧ resistance

23‧‧‧Rectification and signal feedback circuit

A1, B1‧‧‧ protective resistor

A2, B2‧‧‧ lower bridge switching components

A3, B3‧‧‧ signal modulation resistor

A4, B4‧‧‧ control diode

A5, B5‧‧‧ Zener diode

A6, B6‧‧‧ switching components

A7, B7‧‧‧ upper bridge diode

239‧‧‧ Capacitance

24‧‧‧Circuit protection circuit

241‧‧‧resistance

242, 243‧‧‧ Switching components

25‧‧‧ Voltage regulator circuit

251‧‧‧Stabilized capacitor

252‧‧‧DC buck

253‧‧‧electric output

26‧‧‧DC buck

27‧‧‧Resonance Capacitor

271‧‧‧Acoustic coil

V0‧‧‧Normal voltage

V1‧‧‧ high discriminating level

V2‧‧‧ low discriminating level

W3, W4, W6, W7‧‧‧ waveforms

W81, W82, W83‧‧‧ waveform

90‧‧‧ Process

900~918‧‧‧Steps

FIG. 1 is a schematic diagram of a power supply module of an inductive power supply according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a power receiving module of an inductive power supply according to an embodiment of the present invention.

Figure 3 is a schematic diagram of the output signal waveform of the signal analysis circuit during the detection phase.

Figure 4 is a schematic diagram of the output signal waveform of the signal analysis circuit during the power supply phase.

Fig. 5 is a schematic diagram showing the waveform enlargement of Fig. 4.

FIG. 6 is a schematic diagram showing the output signal waveform of the signal analysis circuit when the load on the power receiving output of the power receiving module is increased according to the embodiment of the present invention.

FIG. 7 is a schematic diagram of a waveform of a feedback trigger signal that cannot generate a positive phase when the impedance of the power receiving output of the power receiving module is smaller than the signal modulation resistor according to the embodiment of the present invention.

Figure 8 is a waveform diagram of the clamp circuit clamped to generate a trigger signal.

FIG. 9 is a schematic diagram of a process of automatically adjusting a voltage level according to an embodiment of the present invention.

Please refer to FIG. 1 . FIG. 1 is a schematic diagram of a power supply module 10 of an inductive power supply according to an embodiment of the present invention. As shown in FIG. 1 , the power supply module 10 includes a power supply microprocessor 11 , power supply driving units 12A and 12B , a signal analysis circuit 13 , a voltage detection circuit 14 , a display unit 15 , a power supply unit 16 , and a resonance The capacitor 17, a power supply coil 171 and a voltage level adjusting device 18. The power supply microprocessor 11 is electrically connected to the power supply driving units 12A and 12B, the voltage detecting circuit 14, the display unit 15, the power supply unit 16, and the voltage level adjusting device 18 for controlling various operations of the power supply module 10. The power supply driving unit 12A includes a driving device 121A, an upper bridge switching element 123A and a lower bridge switching element 124A, and the power supply driving unit 12B includes a driving device 121B, an upper bridge switching element 123B and a lower bridge switching element 124B. The power supply driving units 12A and 12B have the same structure and are electrically connected to the power supply coil 171 for driving the operation of the power supply coil 171. When the power supply driving units 12A and 12B operate simultaneously, full bridge driving can be performed. In some embodiments, only one of the power supply driving units 12A and 12B may be turned on, or only one power supply driving unit 12A or 12B may be configured to perform half bridge driving. The signal analysis circuit 13 includes a filter composed of resistors R1 R R6 and capacitors C1 C C4 , and is electrically connected to the power supply coil 171 and the voltage level adjusting device 18 for detecting and analyzing the data signals on the power supply coil 171. The signal analysis result is transmitted to the voltage level adjusting device 18 for subsequent interpretation and processing. In order to improve the strength of the signal, the signal analysis circuit 13 can include a clamp circuit 131 for clamping the input signal of the signal analysis circuit 13 to a higher potential to increase the strength of the trigger signal, thereby improving the back end. to make The probability of reading the data code. The clamp circuit 131 can be composed of diodes D1 and D2 and a capacitor C5.

Please continue to refer to Figure 1. The voltage detecting circuit 14 is a circuit composed of a resistor, a capacitor and a diode, and is electrically connected to the power feeding coil 171 and the power supply microprocessor 11 for detecting the voltage of the power feeding coil 171 and supplying the voltage information to the power supply. The microprocessor 11 performs subsequent interpretation and processing. The display unit 15 is electrically connected to the power supply microprocessor 11 for displaying the operating state of the power supply module 10. The power supply unit 16 is composed of a voltage dividing resistor 162, 163 and a DC buck 164. The power supply unit 16 is electrically connected to the power supply driving units 12A and 12B and the power supply microprocessor 11 for receiving an external voltage source 161 to provide a power supply coil. The power source driven by the 171 and provides the power required for the power module 10 to operate. The resonant capacitor 17 is electrically connected to the power supply coil 171 for assisting the power supply coil 171 to resonate to generate AC electromagnetic energy transmission. The power supply coil 171 is electrically connected to the resonant capacitor 17, the power supply driving units 12A and 12B, the signal analyzing circuit 13 and the voltage detecting circuit 14, for transmitting energy to the power receiving end, and receiving the feedback signal from the power receiving end for transmission to the signal analysis. The circuit 13 performs an analysis process. The voltage level adjusting device 18 includes a detecting device 183, an adjusting microprocessor 184, an output device 181, and a comparator 182. The detecting device 183 is electrically connected to the signal analyzing circuit 13 and the adjusting microprocessor 184, and can be used to detect the output voltage and signal of the signal analyzing circuit 13 for output to the adjusting microprocessor 184. In some embodiments, the detecting device 183 includes an analog-to-digital converter (ADC) for converting the analog signal outputted by the signal analyzing circuit 13 into a digital signal for output to the regulating microprocessor 184. Subsequent interpretation and processing. The adjusting microprocessor 184 is electrically connected to the detecting device 183 and the output device 181 for receiving the output voltage from the detecting device 183, and generating a high discriminating level and a low discriminating level according to the output voltage, and then selecting The high discrimination level or the low discrimination level is output to the output device 181. The output device 181 is electrically connected to the adjustment microprocessor 184 and the comparator 182, and can be used to receive the level signal from the adjustment microprocessor 184 for output to the comparator 182 as a reference voltage. In some embodiments, the output device 181 includes a digital analog converter (DAC) for adjusting the digital form output by the microprocessor 184. The high discrimination level or low discrimination level signal is converted to an analog voltage reference voltage to be supplied to the comparator 182 for subsequent interpretation and processing. One input end of the comparator 182 is electrically connected to the detecting device 183 for receiving the trigger signal from the signal analyzing circuit 13, and the other input terminal is electrically connected to the output device 181 for receiving the reference voltage, and the output end thereof is electrically The comparator 182 is coupled to the adjustment microprocessor 184; the comparator 182 compares the trigger signal with the reference voltage to generate a data code output to the adjustment microprocessor 184. It should be noted that the adjustment microprocessor 184 is separately provided in the voltage level adjustment device 18, and in some embodiments, the adjustment microprocessor 184 can also be integrated into the power supply microprocessor 11, or Other forms are implemented in the power supply module 10 without being limited thereto.

Please refer to FIG. 2, which is a schematic diagram of a power receiving module 20 of an inductive power supply according to an embodiment of the present invention. As shown in FIG. 2, the power receiving module 20 includes a powered microprocessor 21, a voltage detecting circuit 22, a rectifying and signal feedback circuit 23, a circuit breaker circuit 24, a voltage stabilizing circuit 25, and a constant voltage step-down. The device 26 has a resonant capacitor 27 and a power receiving coil 271. The power receiving microprocessor 21 is electrically connected to the voltage detecting circuit 22, the rectifying and signal feedback circuit 23, the circuit breaking protection circuit 24, the voltage stabilizing circuit 25 and the DC bucker 26 for controlling the operations of the power receiving module 20. The voltage detecting circuit 22 includes resistors 221A and 221B electrically connected to the power receiving coil 271 and the power receiving microprocessor 21 for detecting the voltage of the power receiving coil 271 for output to the power receiving microprocessor 21 for subsequent interpretation and processing. The rectifying and signal feedback circuit 23 is electrically connected to the power receiving coil 271 and the power receiving microprocessor 21 for rectifying and modulating the feedback signal received by the power receiving coil 271. The circuit breaker protection circuit 24 includes a resistor 241 and switching elements 242 and 243 electrically connected between the power receiving coil 271 and the power receiving microprocessor 21 and the voltage stabilizing circuit 25 for avoiding the power receiving module 20 and a power receiving output terminal 253. The load components are burned. The voltage stabilizing circuit 25 includes a voltage stabilizing capacitor 251 and a DC follower 252 electrically connected to the power receiving coil 271 and the power receiving microprocessor 21. Controlled by the powered microprocessor 21, the voltage stabilizing circuit 25 can receive the power from the power receiving coil 271 to output a stable voltage to the power receiving output 253. The DC buck 26 is electrically connected to the power receiving coil 271 and the power receiving microprocessor 21, and can receive power from the power receiving coil 271 to be supplied to the power receiving microprocessor 21. Harmonic The vibration capacitor 27 is electrically connected to the power receiving coil 271 for assisting the power receiving coil 271 to resonate to transmit AC power and signals. The power receiving coil 271 is electrically connected to the rectifying and signal feedback circuit 23 and the voltage stabilizing circuit 25 for receiving the power supply of the power supply coil 17 for transmitting the power supply to the output terminal through the voltage stabilizing circuit 25; on the other hand, the rectifying and signal feedback circuit The feedback signal generated by 23 is transmitted to the power supply module 10 by the power receiving coil 271.

Please continue to refer to FIG. 2, and the detailed architecture of the rectification and signal feedback circuit 23 is also shown in FIG. As shown in FIG. 2, the rectification and signal feedback circuit 23 includes upper bridge diodes A7 and B7, lower bridge switching elements A2 and B2, protection resistors A1 and B1, signal modulation resistors A3 and B3, and control diode A4. B4, Zener diodes A5 and B5, and switching elements A6 and B6. The upper bridge diode A7 and the lower bridge switching element A2 are electrically connected to one end N1 of the power receiving coil 271, and can be used for rectification. The upper bridge diode B7 and the lower bridge switching element B2 are electrically connected to the other end point N2 of the power receiving coil 271, and can also be used for rectification. The signal modulation resistors A3 and B3 are electrically connected to the terminals N1 and N2 of the power receiving coil 271, respectively, and can be used to modulate the feedback signal. In general, the signal modulation resistors A3 and B3 need to use a resistor with a small resistance value, and the resistance is sufficient to modulate the feedback signal when the power receiving module 20 is idling. Each of the switching elements A6 and B6 includes a drain (D) electrically connected to the signal modulation resistors A3 and B3, a source (S) electrically connected to a ground end, and a gate (G) electrically connected to the gate The powered microprocessor 21 can be used to control the signal modulation resistors A3 and B3 to modulate the feedback signal, and to control the lower bridge switching elements A2 and B2 for rectification. The protection resistor A1 is electrically connected between the terminal N1 of the power receiving coil 271 and one of the gates of the lower bridge switching element B2, and can be used to provide a switching rectifier switch signal and protect the lower bridge switching element B2 from burning. The protection resistor B1 is electrically connected between the terminal N2 of the power receiving coil 271 and one of the gates of the lower bridge switching element A2, and can be used to provide a switching rectifier switch signal and protect the lower bridge switching element A2 from burning. In general, the protection resistors A1 and B1 need to use a resistor with a large resistance value, and the resistance is sufficient to protect the lower bridge switching elements A2 and B2 from burning. The Zener diode A5 is electrically connected between the gate of the lower bridge switching element A2 and the ground terminal, and can be used to limit the gate voltage of the lower bridge switching element A2 to prevent it from being burnt. Zener diode B5 is electrically connected to the lower The gate of the bridge switching element B2 and the ground terminal can be used to limit the gate voltage of the lower bridge switching element B2 to avoid burning. The control diode A4 is electrically connected between the gate of the lower bridge switching element A2 and one of the drains of the switching element A6, and can be used to provide a conduction path of the gate of the lower switching element A2 to the ground. The control diode B4 is electrically connected between the gate of the lower bridge switching element B2 and one of the drains of the switching element B6, and can be used to provide a conduction path of the gate of the lower bridge switching element B2 to the ground. In some embodiments, the rectification and signal feedback circuit 23 can include a capacitor 239 for voltage regulation.

In actual operation, the powered microprocessor 21 can respectively control the switching elements A6 and B6 to be turned on or off to control the lower bridge switching elements A2 and B2 to perform half-bridge synchronous rectification or stop rectification, and control the signal modulation resistors A3 and B3 to be fully modulated. The detailed operation mode of the wave feedback signal or the half-wave feedback signal has been disclosed in the Republic of China Patent Publication No. 201236304, and will not be described herein. The main difference between the rectifying and signal feedback circuit of the present invention and the rectifying and signal feedback circuit of the Republic of China Patent Publication No. 201236304 is that the rectifying and signal feedback circuit of the present invention uses different resistors to modulate the feedback signal and protect the lower bridge switching element. In the rectification and signal feedback circuit 23, the signal modulation resistors A3 and B3 are used to modulate the feedback signal, and the protection resistors A1 and B1 are used to protect the lower bridge switching elements A2 and B2. For Metal-Oxide Semiconductor Field-Effect Transistors (MOSFETs), the drain and the source can withstand higher voltage differences, and the voltage difference between the gate and the other terminals can withstand It is low, and when the gate exceeds the withstand voltage limit, the switching element formed by the field effect transistor is burnt. Therefore, under the architecture of the rectification and signal feedback circuit 23, the protection resistors A1 and B1 are generally designed as resistors having a large resistance value to avoid large voltage variations of the terminals N1 and N2 when the power receiving coil 271 is receiving power. The gate to the lower switching element A2 or B2 causes an instantaneous large current to flow to the gate of the downstream switching element A2 or B2, causing the lower switching element A2 or B2 to burn. The gates of the lower bridge switching elements A2 and B2 are separately provided with Zener diodes A5 and B5 to absorb excessive voltage. The control diodes A4 and B4 are used to provide a conduction path and prevent the AC signal from being poured back to the gate of the lower bridge switching element A2 or B2. As a result, the disadvantage that the lower bridge switching element is easily burned out in the Republic of China Patent Publication No. 201236304 can be improved.

On the other hand, the signal modulation resistors A3 and B3 are usually designed as resistors with a small resistance value. When the power receiving output terminal 253 is unloaded, the signal modulation resistors A3 and B3 are connected to the ground through the switching elements A6 and B6. In order to generate a load on the power receiving coil 271, since the signal modulation resistors A3 and B3 have low resistance values, power is received during signal modulation. Therefore, the signal can be modulated by the signal modulation resistors A3 and B3 only when the power receiving output 253 is unloaded.

In detail, the output signal waveform of the signal analysis circuit 13 in the power supply module 10 can be referred to the third and fourth figures. FIG. 3 is a schematic diagram of the output signal waveform W3 of the signal analysis circuit 13 during the detection phase. As shown in FIG. 3, the signal source of the waveform W3 is an alternating current signal in which the power supply coil 171 and the resonant capacitor 17 resonate, and is analyzed by the rectification and low-pass filtering of the signal analyzing circuit 13. When the voltage on the coil changes, it is converted into a pulse signal by the processing of the signal analysis circuit 13, and these pulse signals constitute an element of data transmission. In the comparator 182, when the input signal is higher than a high discrimination level V1 or lower than a low discrimination level V2, the output logic state may be changed, and the adjustment microprocessor 184 interprets the logic state change to decode the trigger signal. For complete information. In the signal outputted to the comparator 182 by the signal analysis circuit 13, the normal voltage V0 is connected to the external voltage source 161 by the signal analysis circuit 13 and the DC level generated by a resistor pull-up before any signal input is performed. . This DC level is not accurate because of the drift of the part and power supply error. The waveform W3 shows a detection phase. In the standby state, the power supply terminal 10 that transmits power transmits a detection signal at intervals to identify whether a power receiving device exists (such as point B). Before sending the detection signal, the program can be arranged to first capture the normal voltage V0 (such as point A) received by the detecting device 183, and then obtain the voltage value and then add and subtract the threshold to generate a high discriminating level. V1 and the low discrimination level V2, and the set discrimination level is generated by the output device 181 to be output to the comparator 182 for processing. The height of the discrimination level can be arbitrarily set. The closer to the normal voltage V0, the greater the sensitivity, and the threshold can be increased, so that the noise in the signal is not easily touched by the system. In the detection phase, only high discrimination levels are used. V1, there will be no inverted signal at this stage.

Please refer to FIG. 4, which is a schematic diagram of the output signal waveform W4 of the signal analysis circuit 13 during the power supply phase. As shown in Figure 4, during the power supply phase, the coil will continue to resonate and send a signal, so the normal voltage V0 needs to be detected between the data-triggered slots (such as point C and point D). In some embodiments, since the data transmission uses the "timing synchronization type data transmission", the normal voltage V0 can be accurately selected in the neutral state, and the converted value is further adjusted by the program of the microprocessor 184 to increase or decrease the threshold value. Generate a reference voltage. In some embodiments, since the signal carries noise, after the detecting device 183 converts the detected voltage into a signal, the adjusting microprocessor 184 performs a high discrimination level V1 according to the average value of the previous detections. And the setting of the low discrimination level V2.

Please refer to FIG. 5, and FIG. 5 enlarges the waveform W4 shown in FIG. 4 to facilitate observation. As shown in FIG. 5, the signal on the power supply coil 171 generates a voltage change due to the signal modulation received by the power receiving module 20, and is processed by the signal analysis circuit 13 to generate a waveform W4. In the trigger signal of the normal voltage V0, when the high level V1 is higher than the high level V1, the trigger signal of the trigger comparator 182 (such as point E) is generated, so that the adjustment microprocessor 184 performs the relevant decoding operation. In some embodiments, the adjustment microprocessor 184 can also read the maximum value of the signal to obtain the strength of the trigger signal (such as point F) as the interpretation information for the power supply microprocessor 11 to adjust the power supply output.

Please refer to FIG. 6. FIG. 6 is a schematic diagram of the output signal waveform W6 of the signal analysis circuit 13 when the power receiving output 253 of the power receiving module 20 is loaded and weighted according to the embodiment of the present invention. The modulation of the original signal feedback is a change in the load generated by the signal modulation resistors A3 and B3 in the rectification and signal feedback circuit 23, and is fed back to the power supply coil 17. However, as shown in FIG. 6, when the load of the power receiving module 20 is increased, that is, the load resistance behind the power receiving output 253 becomes smaller, the signal change caused during the signal modulation becomes smaller (feedback signal modulation principle). The signal is reflected by the amount of change in the load. If the load resistance at the back end becomes small, the modulation effect of the signal modulation resistors A3 and B3 If it will get worse). Although the signal is degraded in Figure 6, this is a state that can be triggered. In addition, it can be seen that when the threshold value is smaller, the reference voltage will be closer to the level of the normal voltage V0, and a small trigger signal can be detected. At this time, the intensity of the signal can be interpreted after the trigger, and the adjustment microprocessor 184 can detect that the signal strength has deteriorated, and then adjust through the software.

Please refer to FIG. 7. FIG. 7 is a schematic diagram of a waveform W7 of a feedback trigger signal that cannot generate a positive phase when the impedance of the power receiving output 253 of the power receiving module 20 is smaller than the signal modulation resistors A3 and B3 according to the embodiment of the present invention. In this case, the voltage level adjustment device 18 can use the inverted trigger signal for interpretation. According to the invention of the Republic of China Patent Publication No. 201236304, it can be seen that when the power receiving end has a high power output, the rectification and signal feedback circuit 23 is turned off during the modulation signal, so that the coil resonance voltage is idling in a short time and the amplitude is reduced. Then, the signal analysis circuit 13 analyzes the inverted trigger signal. At this time, the previously established low discrimination level V2 can be used as the reference voltage to detect the trigger signal, so that the comparator 182 can output the transition logic signal when the trigger is triggered, thereby performing signal interpretation to generate the data code.

It is to be noted that, in order to compensate for the slight change of the voltage on the power supply coil 171, in order to improve the probability of successfully reading the data code, in some embodiments, the clamp circuit 131 may be added to the front end of the signal analysis circuit 13. In the Republic of China Patent Publication No. 201134053, the signal source of the signal analysis circuit 13 is the AC signal on the power supply coil 17, which is taken out after rectification, low-pass filtering, and the like. The Republic of China Patent Publication No. 201134053 processes the signal on the coil through a diode half-wave rectification, which also cuts the signal variation by half. The present invention utilizes the clamp circuit 131 to cause the signal to pass through a capacitor C5 and then clamped with two diodes D1 and D2, the signal of which is shown in FIG. The waveform of the original signal is W83. After clamping, the variation of the upper and lower sides of the AC signal on the coil is raised upwards, and then the waveform W82 is generated, and then the low-pass filtering can be used to obtain better signal strength. Is for waveform W81.

The above operation mode of the voltage level adjusting device 18 can be summarized as an automatic adjusting voltage level process 90, as shown in FIG. The auto-regulation voltage level process 90 includes the following steps:

Step 900: Start.

Step 902: The detecting device 183 detects an output voltage of one of the signal analyzing circuits 13.

Step 904: The adjustment microprocessor 184 adds a first threshold to the output voltage to generate a high discrimination level V1, and subtracts a second threshold from the output voltage to generate a low discrimination level V2.

Step 906: The output device 181 outputs a high discrimination level V1 as a reference voltage.

Step 908: The comparator 182 compares the trigger signal and the reference voltage of the signal analysis circuit 13 to generate a first data code.

Step 910: The adjustment microprocessor 184 determines whether the first data code cannot be triggered and generated because the trigger signal strength is too weak or other reasons. If yes, go to step 912; if no, go to step 902.

Step 912: The output device 181 instead outputs a low discrimination level V2 as a reference voltage.

Step 914: The comparator 182 compares the trigger signal and the reference voltage of the signal analysis circuit 13 to generate a second data code.

Step 916: The adjustment microprocessor 184 determines whether the second data code can be correctly obtained. If yes, go to step 912; if no, go to step 902.

Step 918: End.

It should be noted that the present invention provides an automatic adjustment voltage standard that can amplify the feedback signal strength in the inductive power supply and transmit the reference voltage of the comparator through a highly accurate circuit architecture to improve the signal discrimination sensitivity. Bit method and its voltage level adjustment device. The automatic adjustment voltage level method and the voltage level adjustment device can automatically adjust the comparator to use positive phase or reverse phase The trigger signal is used for interpretation and the reference voltage can be adjusted. Those skilled in the art will be able to devise or vary, and are not limited thereto. For example, the switching element formed by the field effect transistor used in the above embodiment is only one of many embodiments, and the field effect transistor of the N type or the P type can be used according to system requirements, without being limited thereto. In other embodiments, the architecture of the power supply module 10 and the power receiving module 20 can also be implemented using other types of switching elements. In addition, the above-described power supply driving units 12A and 12B, the power supply unit 16, the voltage detecting circuit 22, the open circuit protection circuit 24, the voltage stabilizing circuit 25, and the DC bucks 164, 26 and 252 are common circuits having a specific purpose. The implementation of these modules is not limited to the structures in FIGS. 1 and 2, and may be implemented by other circuit configurations, and only needs to achieve its specific purpose or use.

In summary, the inductive power supply of the present invention has a voltage level adjustment device that provides a method of automatically adjusting the voltage level. The method and device can automatically adjust the comparator to use the positive or negative trigger signal for interpretation, and can adjust the size of the reference voltage. When it is necessary to avoid noise interference, the distance between the reference voltage and the normal voltage can be increased; when the signal discrimination sensitivity needs to be improved, the distance between the reference voltage and the normal voltage can be reduced. The rectification and signal feedback circuit has a well-modulated feedback signal and provides good protection of the switching elements. The signal analysis circuit can amplify the strength of the feedback signal to increase the probability of successfully reading the data code. The voltage level adjustment device is realized by a circuit structure with high accuracy, which can improve the accuracy and sensitivity of signal discrimination.

10‧‧‧Power supply module

11‧‧‧Powered microprocessor

12A, 12B‧‧‧Power supply unit

121A, 121B‧‧‧ drive

123A, 123B‧‧‧Upper bridge switching components

124A, 124B‧‧‧ lower bridge switching components

13‧‧‧Signal analysis circuit

131‧‧‧Clamp circuit

R1~R6‧‧‧ resistor

C1~C5‧‧‧ capacitor

D1, D2‧‧‧ diode

14‧‧‧Voltage detection circuit

15‧‧‧Display unit

16‧‧‧Power supply unit

161‧‧‧External voltage source

162, 163‧‧ ‧ voltage divider resistor

164‧‧‧DC buck

17‧‧‧Resonance capacitor

171‧‧‧Power supply coil

18‧‧‧Voltage level adjustment device

181‧‧‧ Output device

182‧‧‧ comparator

183‧‧‧Detection device

184‧‧‧Adjusting the microprocessor

Claims (18)

A method for automatically adjusting a voltage level for an inductive power supply, the method comprising: detecting an output voltage of a signal analysis circuit; adding a first threshold to the output voltage to generate a first Determining the level, and subtracting a second threshold from the output voltage to generate a second discriminating level; outputting the first discriminating level as a reference voltage; and comparing one of the signal dissipating circuits to the trigger signal and The reference voltage is generated to generate a first data code. When the step of comparing the trigger signal of the signal analysis circuit and the reference voltage to generate the first data code fails, the method further includes: changing The second discrimination level is outputted as the reference voltage, and the trigger signal of the signal analysis circuit and the reference voltage are compared to generate a second data code. The method of claim 1, further comprising detecting a maximum value of the trigger signal of the signal analysis circuit to obtain a signal strength. The method of claim 1, wherein the step of detecting the output voltage of the signal analysis circuit is performed in a neutral state in which the power receiving device of the inductive power supply does not transmit a signal. The method of claim 1, wherein the signal analysis circuit clamps an input signal to a higher potential to increase the strength of the trigger signal, thereby increasing the probability of successfully generating the first data code. A voltage level adjusting device is used for an inductive power supply device. The voltage level adjusting device comprises: a detecting device for detecting an output voltage of a signal analyzing circuit; An adjustment microprocessor electrically connected to the detecting device for adding a first threshold value to the output voltage to generate a first discrimination level, and subtracting the output voltage from a second threshold value Generating a second discriminating level; an output device electrically connected to the adjusting microprocessor for outputting the first discriminating level as a reference voltage; and a comparator comprising two input terminals respectively Connected to the detecting device and the output device, and an output terminal electrically connected to the adjusting microprocessor for comparing a trigger signal of the signal analyzing circuit and the reference voltage to generate a first data code; When the comparator is unable 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 discrimination level as the reference voltage, the comparison The device compares the trigger signal of the signal analysis circuit with the reference voltage to generate a second data code. The voltage level adjusting device of claim 5, wherein the detecting device further detects a maximum value of the trigger signal of the signal analyzing circuit to obtain a signal strength. The voltage level adjusting device according to claim 5, wherein the detecting device detects the output voltage of the signal analyzing circuit in a neutral state in which the power receiving device of the inductive power supply device does not transmit a signal. The voltage level adjusting device of claim 5, wherein the signal analyzing circuit comprises a clamping circuit for clamping an input signal of the signal analyzing circuit to a higher potential to increase the intensity of the trigger signal. In turn, the probability of successfully generating the first data code is improved. The voltage level adjusting device of claim 5, wherein the detecting device comprises an analog-to-digital converter for converting the trigger signal into a digital form signal for outputting to the adjusting The microprocessor performs subsequent interpretation and processing. The voltage level adjusting device of claim 5, wherein the output device comprises a digital analog converter for converting the first determining level or the second determining level output by the adjusting microprocessor to The reference voltage of the analog form is input to the comparator for subsequent interpretation and processing. An inductive power supply includes: a power supply module, comprising: a power supply coil for transmitting power and transmitting signals; and a power supply driving unit electrically connected to the power supply coil for driving the power supply coil a voltage detecting circuit electrically connected to the power supply coil for detecting the voltage of the power supply coil; a signal analysis circuit electrically connected to the power supply coil for detecting and analyzing data on the power supply coil a power supply microprocessor electrically connected to the power supply driving unit and the voltage detecting circuit for controlling various operations of the power supply module; a display unit electrically connected to the power supply microprocessor for Displaying an operating state of the power supply module; a power supply unit electrically connected to the power supply driving unit and the power supply microprocessor for receiving an external voltage source to provide power supply by the power supply coil and providing the power supply a power supply required for the operation of the module; and a voltage level adjustment device electrically connected to the power supply microprocessor and the signal analysis circuit, the voltage level adjustment Apparatus comprising: a detection means for detecting one of a signal analysis circuit output voltage; An adjustment microprocessor electrically connected to the detecting device for adding a first threshold value to the output voltage to generate a first discrimination level, and subtracting the output voltage from a second threshold value Generating a second discriminating level; an output device electrically connected to the adjusting microprocessor for outputting the first discriminating level as a reference voltage; and a comparator comprising two input terminals respectively Connected to the detecting device and the output device, and an output terminal electrically connected to the adjusting microprocessor for comparing a trigger signal of the signal analyzing circuit and the reference voltage to generate a first data code; When the comparator is unable 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 discrimination level as the reference voltage, the comparison Comparing the trigger signal and the reference voltage of the signal analysis circuit to generate a second data code; and a power receiving module, comprising: a power receiving coil, configured to receive power supply of the power supply coil, and Sending a feedback signal to the power supply module; a voltage detecting circuit electrically connected to the power receiving coil for detecting the voltage of the power receiving coil; and a power receiving microprocessor electrically connected to the voltage detecting circuit For controlling the operation of the power receiving module; a rectifying and signal feedback circuit electrically connected to the power receiving coil and the power receiving microprocessor for rectifying and modulating the power received by the power receiving coil The rectifying and signal feedback circuit includes: a first upper bridge diode and a first lower bridge switching element electrically connected to one of the first ends of the power receiving coil for rectification; and a second upper bridge a diode and a second lower bridge switching element electrically connected to the power receiving a second end of the coil is used for rectification; a first resistor and a second resistor are electrically connected to the first end and the second end of the power receiving coil, respectively, for modulating the feedback signal; The third switching element and the fourth switching element each include a drain electrically connected to the first resistor and the second resistor, a source electrically connected to a ground, and a gate electrically connected to the gate The power receiving microprocessor is configured to control the first resistor and the second resistor to modulate the feedback signal, and control the first lower bridge switching component and the second lower bridge switching component to perform rectification; and a third resistor electrically connected Between the first end of the power receiving coil and one of the gates of the second lower bridge switching element, the second lower bridge switching element is protected from burning, and a rectification switching signal is provided to the second lower bridge. a switching element; a fourth resistor electrically connected between the second end of the power receiving coil and one of the gates of the first lower bridge switching element for protecting the first lower bridge switching element from burning And providing a rectification switching signal to the first lower bridge a first Zener diode electrically connected between the gate of the first lower bridge switching element and the ground terminal for limiting the voltage of the gate of the first lower bridge switching element a second Zener diode electrically connected between the gate of the second lower bridge switching element and the ground end for limiting the gate of the second lower bridge switching element a voltage of the pole to avoid burning thereof; a first control diode electrically connected between the gate of the first lower bridge switching element and the third switching element for providing the first lower bridge switch a conducting path of the gate to the ground end of the component, and preventing a signal of another rectification cycle from being poured back by the power receiving coil to the gate of the first lower bridge switching element; and a second control diode electrically connected Providing the second lower bridge switching element between the gate of the second lower bridge switching element and the fourth switching element a gate conducting path to the ground end, and preventing a signal of another rectification period from being poured back by the power receiving coil to the gate of the second lower bridge switching element; a circuit breaker protection circuit electrically connected to the power receiving coil and the gate a power receiving microprocessor for preventing the power receiving module and the load component from being burned; and a voltage stabilizing circuit electrically connected to the power receiving coil, the circuit breaker protection circuit and the power receiving microprocessor for receiving the power receiving coil The power supply outputs a stable voltage to a load terminal. The inductive power supply of claim 11, wherein the detecting device detects the maximum value of the trigger signal of the signal analyzing circuit to obtain a signal strength. The inductive power supply according to claim 11, wherein the detecting device detects the output voltage of the signal analyzing circuit in a neutral state in which the power receiving device does not transmit a signal. The inductive power supply of claim 11, wherein the signal analysis circuit comprises a clamp circuit for clamping an input signal of the signal analysis circuit to a higher potential to increase the intensity of the trigger signal. In turn, the probability of successfully generating the first data code is improved. The inductive power supply according to claim 11, wherein the detecting device comprises an analog-to-digital converter for converting the trigger signal into a digital form signal for output to the adjusting microprocessor for subsequent interpretation. And processing. The inductive power supply of claim 11, wherein the output device comprises a digital analog converter for converting the first discrimination level or the second determination level output by the adjustment microprocessor to The reference voltage of the analog form is input to the comparator for subsequent interpretation and processing. The inductive power supply of claim 11, wherein the first resistor and the second resistor have a first resistance, the first resistance being sufficient to modulate the feedback signal when the power receiving module is idling. The inductive power supply of claim 11, wherein the third resistor and the fourth resistor have a second resistance, the second resistance being sufficient to protect the first lower bridge switching element and the second lower bridge switch Components to avoid burning them.