Inductive power supply and method for operating the same

Abstract

The present disclosure provides an inductive power supply, comprising: a power supply end comprising a power supply coil, wherein the power supply end is in a power transmission state or a self-resonance state; and a power receiving end receiving power from the power supply end in an inductive manner, comprising a power receiving coil; a plurality of power receiving drive modules each comprising a power receiving capacitor, a power receiving switching circuit and a power receiving driver; a power receiving controller providing a plurality of power receiving coil driving signals to the plurality of power receiving drive modules; and a signal processor continuously receiving power receiving resonance signals on the power receiving coil and providing the power receiving controller, wherein when the power supply end is in the self-resonance state, the power receiving controller adjusts the number of enabled power receiving drive modules according to the distance between the power supply coil and the power receiving coil. The present disclosure also relates to an operating method of an inductive power supply.

Description

Technical Field

[0001] This disclosure pertains to the field of power supplies, and particularly relates to an inductive power supply with variable capacitor and rectification control, and a suitable operating method thereof. Background Technology

[0002] The main architecture of an inductive power supply (such as an inductive charger that transmits energy through coil induction) is that the power supply end is equipped with a driver to drive the resonant capacitor and coil of the power supply end to resonate, so that the coil of the power supply end sends electrical energy, and the coil of the receiving end receives the electrical energy. The efficiency is improved by resonating the resonant capacitor and coil of the receiving end, and then the rectifier is used to convert the electrical energy into a power specification suitable for the load.

[0003] The changes in the resonant frequency of the resonant capacitor and the coil can affect the maximum power transfer and efficiency of the inductive power supply. In actual operation, the inductance of the coil will vary depending on the induction distance between the coil at the power supply end and the power receiving end. Different resonant frequencies of the inductive power supply can optimize its performance. However, the capacitor used for resonance in current inductive power supplies is a fixed value during production and cannot be adjusted according to the change in the induction distance of the coil, which causes the efficiency of the inductive power supply to be unable to be maintained at its optimal level.

[0004] Therefore, developing an inductive power supply with variable capacitance and rectification control, and its operation method, that can improve upon the shortcomings of the existing technology is an urgent need. Summary of the Invention

[0005] The purpose of this disclosure is to provide an inductive power supply with variable capacitance and rectification control, and its operating method. When the power supply is in a self-resonant state, the receiving end of the inductive power supply measures the resonant frequency to obtain the distance between the power supply coil and the receiving coil. Then, according to the distance between the power supply coil at the power supply end and the receiving coil at the receiving end, the number of activated power receiving drive modules is adjusted to change the number of operating capacitors at the receiving end, thereby adjusting the resonant frequency. This allows the inductive power supply to achieve high efficiency regardless of the distance between the power supply coil and the receiving coil at the receiving end.

[0006] To achieve the aforementioned objectives, this disclosure provides an inductive power supply, comprising: a power supply terminal connected to a power source and including: a power supply coil having a first node and a second node at its two ends; a power supply drive module including a power supply resonant capacitor, a power supply switching circuit, and a power supply driver, wherein the power supply switching circuit is connected to the power supply and electrically connected between the power supply resonant capacitor and the power supply driver, the power supply resonant capacitor is also electrically connected to the first node and resonates with the power supply coil; a power supply controller electrically connected to the power supply drive module and providing a power supply drive signal to the power supply drive module, causing the power supply driver to drive the power supply switching circuit according to the power supply drive signal, wherein the power supply controller enables or disables the power supply drive module through the power supply drive signal to correspondingly control the power supply terminal to be in a power transmission state or a self-resonant state; and a power receiving terminal, configured to receive power from the power supply terminal in an inductive manner, and including: a power receiving coil electromagnetically coupled to the power supply coil and having a first node and a second node at its two ends; and a plurality of power receiving drive modules. Each power receiving drive module includes a power receiving capacitor, a power receiving switch circuit, and a power receiving driver. The power receiving switch circuit is connected to the output terminal of the inductive power supply and is electrically connected between the power receiving capacitor and the power receiving driver. The power receiving capacitor is also electrically connected to the first node of the power receiving coil. A power receiving controller is electrically connected to a plurality of power receiving drive modules and provides a plurality of power receiving coil drive signals to the plurality of power receiving drive modules. In each power receiving drive module, the power receiving driver drives the power receiving coil switch circuit according to the power receiving coil drive signal. A first signal processor is electrically connected to the first node of the power receiving coil and the power receiving controller, and continuously receives the power receiving resonant signal on the power receiving coil and provides it to the power receiving controller. When the resonant frequency of the power receiving resonant signal is lower than a preset frequency, the power receiving controller determines that the power supply end is in a self-resonant state. When the power supply end is in a self-resonant state, the power receiving controller obtains the distance between the power supply coil and the power receiving coil according to the resonant frequency, and adjusts the number of activated power receiving drive modules according to the distance.

[0007] To achieve the aforementioned objectives, this disclosure further provides a method for operating an inductive power supply, comprising the steps of: (S1) providing a power supply terminal and a power receiving terminal for the inductive power supply, wherein the power supply terminal includes a power supply coil, at least one power supply drive module and a power supply controller, the at least one power supply drive module includes a power supply resonant capacitor, a power supply switching circuit and a power supply driver, and the power receiving terminal includes a power receiving coil, a plurality of power receiving drive modules, a power receiving controller and a first power receiving signal processor, each power receiving drive module including a power receiving capacitor, a power receiving switching circuit and a power receiving driver; (S2) using the power supply controller to provide a power supply drive signal to the power supply drive module, causing the power supply driver to drive the power supply switching circuit according to the power supply drive signal, and using the power receiving controller to provide a plurality of power receiving drive signals to the power receiving drive module respectively. (S3) The power driver in each power drive module drives the power switch circuit according to the power drive signal; (S4) The power controller enables or disables the power drive module by the power drive signal to control the power supply end to be in the power transmission state or the self-resonance state; (S5) The first power signal processor continuously receives the power resonance signal on the power receiving coil and provides it to the power controller; and (S6) When the resonant frequency of the power resonance signal is lower than the preset frequency, the power controller determines that the power supply end is in the self-resonance state, and when the power supply end is in the self-resonance state, the power controller obtains the distance between the power supply coil and the power receiving coil according to the resonant frequency of the power resonance signal on the power receiving coil, and adjusts the number of power drive modules enabled according to the distance. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the circuit structure of an inductive power supply according to the first embodiment of this disclosure.

[0009] Figure 2 for Figure 1 The diagram shows the timing sequence of voltage parameters at the receiving end of the inductive power supply.

[0010] Figure 3 for Figure 1 The diagram shows the operating waveforms of the upper and lower switches of any power supply switch circuit in the first embodiment when the power receiving drive module of the inductive power supply is turned on.

[0011] Figure 4 for Figure 1 The diagram shows the operating waveforms of the upper and lower switches of any power supply switch circuit in the second embodiment when the power receiving drive module of the inductive power supply is turned on.

[0012] Figure 5 This is a schematic diagram of the circuit structure of an inductive power supply according to a second embodiment of the present disclosure.

[0013] Figure 6 A flowchart illustrating an operation method of an inductive power supply according to an embodiment of this disclosure.

[0014] Explanation of reference numerals in the attached figures:

[0015] 1.1b: Inductive power supply

[0016] 2: Power supply end

[0017] 3: Power receiving end

[0018] 10: Power supply

[0019] 20: Power supply coil

[0020] 4a: Power supply controller

[0021] 5a: First power supply signal processor

[0022] 20a, 30a: First node

[0023] 20b, 30b: Second node

[0024] 21: First power supply drive module

[0025] 22: Second power supply drive module

[0026] C1: First power supply resonant capacitor

[0027] 211: First power supply switch circuit

[0028] 212: First power supply driver

[0029] C2: Second power supply resonant capacitor

[0030] 221: Second power supply switch circuit

[0031] 222: Second power supply driver

[0032] DR1: First power supply drive signal

[0033] DR2: Second power supply drive signal

[0034] RT1: First power supply resonant signal

[0035] RTa: Electrically resonant signal

[0036] 4b: Power Controller

[0037] 5b: First power-receiving signal processor

[0038] 31: First powered drive module

[0039] 32: Second powered drive module

[0040] C1a: First receiving capacitor

[0041] 311: First power receiving switch circuit

[0042] 312: First powered driver

[0043] 1a: Output terminal

[0044] C2a: Second receiving capacitor

[0045] 321: Second power receiving switch circuit

[0046] 322: Second powered driver

[0047] DRa: First electrically driven signal

[0048] DRb: Second powered drive signal

[0049] 330: Auxiliary rectifier

[0050] 331: Diode Bridge Rectifier Circuit

[0051] Q1a, Q1A: First upper switch

[0052] Q1b, Q1B: First switch

[0053] Q2a, Q2A: Second upper switch

[0054] Q2b, Q2B: Second switch

[0055] Pa: First blocking switch

[0056] Pb: Second barrier switch

[0057] Crx: Output capacitor

[0058] 34a: Current detector

[0059] Cf: Current detection signal

[0060] 5c: Second power-receiving signal processor

[0061] Vf: Voltage detection signal

[0062] t1, t2, t3, t4: Time points

[0063] 23: Third power supply drive module

[0064] 24: Fourth power supply drive module

[0065] 6a: Second power supply signal processor

[0066] C3: Third power supply resonant capacitor

[0067] 231: Third power supply switch circuit

[0068] 232: Third power supply driver

[0069] C4: Fourth power supply resonant capacitor

[0070] 241: Fourth power supply switch circuit

[0071] 242: Fourth power supply driver

[0072] DR3: Third power supply drive signal

[0073] DR4: Fourth power supply drive signal

[0074] RT2: Second power supply resonant signal

[0075] Q3a, Q3A: Third upper switch

[0076] Q3b, Q3B: Third switch

[0077] Q4a, Q4B: Fourth upper switch

[0078] Q4b, Q4B: Fourth switch

[0079] 33: Third powered drive module

[0080] 34: Fourth powered drive module

[0081] C3a: Third receiving capacitor

[0082] 331: Third power receiving switch circuit

[0083] 332: Third powered driver

[0084] C4a: Fourth receiving capacitor

[0085] 341: Fourth power receiving switch circuit

[0086] 342: Fourth powered driver

[0087] DRc: Third powered drive signal

[0088] DRd: Fourth powered drive signal

[0089] S1~S5: Steps for running the method

[0090] R1: First power supply conversion signal

[0091] R2: Second power supply conversion signal

[0092] Ra: Power conversion signal Detailed Implementation

[0093] Some typical embodiments embodying the features and advantages of this disclosure will be described in detail in the following description. It should be understood that this disclosure can be varied in different implementations without departing from the scope of this disclosure, and the descriptions and illustrations therein are for illustrative purposes only and are not intended to limit this disclosure.

[0094] Figure 1 This is a schematic diagram of the circuit structure of an inductive power supply according to a first preferred embodiment of this disclosure. Figure 1 As shown, the inductive power supply 1 includes a power supply terminal 2 and a power receiving terminal 3. The power supply terminal 2 is electrically connected to the power supply 10 and is configured to transmit power to the power receiving terminal 3. The power supply terminal 2 includes a power supply coil 20, at least one power supply drive module, a power supply controller 4a, and a first power supply signal processor 5a. The power supply coil 20 has a first node 20a and a second node 20b at its two ends, respectively. In some embodiments, the second node 20b is grounded.

[0095] The number of power supply drive modules at power supply terminal 2 can be one or multiple. Figure 1 Two examples are shown: a first power supply drive module 21 and a second power supply drive module 22. The first power supply drive module 21 includes a first power supply resonant capacitor C1, a first power supply switching circuit 211, and a first power supply driver 212. The first power supply switching circuit 211 is electrically connected to the power supply 10 and is also electrically connected between the first power supply resonant capacitor C1 and the first power supply driver 212. The first power supply resonant capacitor C1 is also electrically connected to the first node 20a. The first power supply driver 212 drives the first power supply switching circuit 211. The first power supply resonant capacitor C1 is in different potential states depending on the switching action of the first power supply switching circuit 211.

[0096] The second power supply drive module 22 is connected in parallel to the first power supply drive module 21. The second power supply drive module 22 includes a second power supply resonant capacitor C2, a second power supply switching circuit 221, and a second power supply driver 222. The second power supply switching circuit 221 is electrically connected to the power supply 10 and is also electrically connected between the second power supply resonant capacitor C2 and the second power supply driver 222. The second power supply resonant capacitor C2 is also electrically connected to the first node 20a. The second power supply driver 222 is used to drive the second power supply switching circuit 221. The second power supply resonant capacitor C2 is in different potential states according to the switching action of the second power supply switching circuit 221.

[0097] The power supply controller 4a is electrically connected to the first power supply drive module 21 and the second power supply drive module 22, and provides a first power supply drive signal DR1 and a second power supply drive signal DR2 to the first power supply driver 212 of the first power supply drive module 21 and the second power supply driver 222 of the second power supply drive module 22, respectively. The first power supply driver 212 drives the first power supply switching circuit 211 according to the first power supply drive signal DR1, and the second power supply driver 222 drives the second power supply switching circuit 221 according to the second power supply drive signal DR2. The first power supply drive signal DR1 and the second power supply drive signal DR2 can be, for example, but not limited to, pulse width modulation signals. The first power supply signal processor 5a is electrically connected to the first node 20a of the power supply coil 20 and the power supply controller 4a, and is used to receive the first power supply resonant signal RT1 from the first node 20a, process it, and provide the first power supply conversion signal R1 to the power supply controller 4a. The first power supply signal processor 5a can adopt an appropriate signal processor according to actual needs, and its specific implementation is not limited in this disclosure. For example, the first power supply signal processor 5a may include an analog-to-digital converter, wherein the analog-to-digital converter digitally converts the first power supply resonant signal RT1 into a first power supply conversion signal R1 and provides it to the power supply controller 4a.

[0098] The power receiving end 3 includes a power receiving coil 30, a plurality of power receiving drive modules, a power receiving controller 4b, and a first power receiving signal processor 5b. The power receiving coil 30 has a first node 30a and a second node 30b at its two ends, and the power receiving coil 30 is electromagnetically coupled to the power supply coil 20. In some embodiments, the second node 30b is grounded.

[0099] Multiple powered drive modules can be used as synchronous rectifier switches, and the number of powered drive modules is two or more. Figure 1 Two powered drive modules are illustrated: a first powered drive module 31 and a second powered drive module 32. The first powered drive module 31 includes a first powered capacitor C1a, a first powered switching circuit 311, and a first powered driver 312. The first powered switching circuit 311 is electrically connected to the output terminal 1a of the inductive power supply 1, and is also electrically connected between the first powered capacitor C1a and the first powered driver 312. The first powered capacitor C1a is also electrically connected to a first node 30a. The first powered driver 312 drives the first powered switching circuit 311, and the first powered capacitor C1a is in different potential states depending on the switching action of the first powered switching circuit 311.

[0100] The second power-receiving drive module 32 is connected in parallel to the first power-receiving drive module 31. The second power-receiving drive module 32 includes a second power-receiving capacitor C2a, a second power-receiving switch circuit 321, and a second power-receiving driver 322. The second power-receiving switch circuit 321 is electrically connected to the output terminal 1a of the inductive power supply 1 and is also electrically connected between the second power-receiving capacitor C2a and the second power-receiving driver 322. The second power-receiving capacitor C2a is also electrically connected to the first node 30a. The second power-receiving driver 322 is used to drive the second power-receiving switch circuit 321. The second power-receiving capacitor C2a is in different potential states according to the switching action of the second power-receiving switch circuit 321.

[0101] The power receiver controller 4b is electrically connected to the first power receiver drive module 31 and the second power receiver drive module 32, and provides a first power receiver drive signal DRa and a second power receiver drive signal DRb to the first power receiver driver 312 of the first power receiver drive module 31 and the second power receiver driver 322 of the second power receiver drive module 32, respectively. The first power receiver driver 312 drives the first power receiver switch circuit 311 according to the first power receiver drive signal DRa, and the second power receiver driver 322 drives the second power receiver switch circuit 321 according to the second power receiver drive signal DRb. The first power receiver drive signal DRa and the second power receiver drive signal DRb can be, for example, but not limited to, pulse width modulation signals. The first power receiver signal processor 5b is electrically connected to the first node 30a of the power receiver coil 30 and the power receiver controller 4b, and is used to continuously receive the power receiver resonant signal RTa from the first node 30a, process it, and provide the power receiver conversion signal Ra to the power receiver controller 4b. The first power receiver signal processor 5b can adopt an appropriate signal processor according to actual needs, and its specific implementation is not limited in this disclosure. For example, the first power-receiving signal processor 5b may include an analog-to-digital converter, wherein the analog-to-digital converter digitally converts the power-receiving resonant signal RTa into a power-receiving converted signal Ra and provides it to the power-receiving controller 4b.

[0102] In this disclosure, the power supply controller 4a enables or disables the first power supply drive module 21 and the second power supply drive module 22 respectively via the first power supply drive signal DR1 and the second power supply drive signal DR2, thereby controlling the power supply terminal 2 to be in a power transmission state or a self-resonance state. When the power supply controller 4a enables the first power supply drive module 21 and the second power supply drive module 22 respectively via the first power supply drive signal DR1 and the second power supply drive signal DR2, the power supply terminal 2 can be controlled to be in a power transmission state. Conversely, when the power supply controller 4a disables the first power supply drive module 21 and the second power supply drive module 22 respectively via the first power supply drive signal DR1 and the second power supply drive signal DR2, the power supply terminal 2 can be controlled to be in a self-resonance state.

[0103] Furthermore, the power receiver controller 4b detects the power receiving resonant signal RTa via the power receiving conversion signal Ra. When the resonant frequency of the power receiving resonant signal RTa is lower than a preset frequency, it determines that the power supply terminal 2 is in a self-resonant state. When the power receiver controller 4b determines that the power supply terminal 2 is in a self-resonant state, it also obtains the distance between the power supply coil 20 and the power receiving coil 30 based on the resonant frequency of the power receiving resonant signal RTa, and adjusts the number of activated power receiving drive modules based on the distance between the power supply coil 20 and the power receiving coil 30. That is, the power receiver controller 4b uses the first power receiving drive... Signal DRa and second powered drive signal DRb enable at least one of the first powered drive module 31 and the second powered drive module 32. For example, the first powered drive module 31 is enabled and the second powered drive module 32 is disabled, or the first powered drive module 31 and the second powered drive module 32 are enabled. This adjusts the effective capacitance and changes the resonant frequency of the powered resonant signal RTa. The number of powered drive modules enabled is negatively correlated with the distance between the power supply coil 20 and the powered coil 30. Increasing the effective capacitance can reduce the resonant frequency of the powered resonant signal RTa.

[0104] As can be seen from the above, the plurality of power receiving drive modules of the power receiving end 3 are connected in parallel and each includes a power receiving capacitor. For example, the first power receiving drive module 31 includes a first power receiving capacitor C1a, and the second power receiving drive module 32 includes a second power receiving capacitor C2a. When the power receiving drive module is activated, the power receiving capacitor in the activated power receiving drive module will resonate with the power receiving coil 30 to generate a power receiving resonant signal RTa. Therefore, the power receiving controller 4b of the power receiving end 3 of the inductive power supply 1 of this disclosure activates a corresponding number of power receiving drive modules according to the distance between the power supply coil 20 and the power receiving coil 30, so as to adjust the number of operating power receiving capacitors that resonate with the power receiving coil 30 and change the equivalent resonant capacitance, thereby adjusting the resonant frequency of the power receiving resonant signal RTa, so that the inductive power supply 1 can achieve high efficiency regardless of the distance between the power supply coil and the power receiving coil of the power receiving end.

[0105] In some embodiments, the power receiver controller 4b is preset with a first frequency and a second frequency, wherein the first frequency is the resonant frequency (lower frequency) of the power supply coil 20 and the power receiving coil 30 when they are closest, and the second frequency is the resonant frequency (higher frequency) of the power supply coil 20 and the power receiving coil 30 when they are at the set maximum sensing distance. The power receiver controller 4b also calculates the distance between the power supply coil 20 and the power receiving coil 30 based on the proportional relationship between the detected resonant frequency of the power receiving resonant signal RTa and the first and second frequencies.

[0106] In some embodiments, the receiving end 3 further includes an auxiliary rectifier 330, electrically connected to the first node 30a and the second node 30b of the receiving coil 30 and the power receiving controller 4b, for rectifying the electrical energy of the receiving coil 30 to provide DC power for the operation of the power receiving controller 4b. The auxiliary rectifier 330 includes a diode bridge rectifier circuit 331, which operates continuously, that is, it immediately rectifies the voltage change of the receiving coil 30 into DC power for the power receiving controller 4b. The auxiliary rectifier 330 has the characteristics of fast response and low output power requirement.

[0107] The circuit structures of the first power supply switch circuit 211, the second power supply switch circuit 221, the first power receiving switch circuit 311, and the second power receiving switch circuit 321 are described in detail below.

[0108] Please refer to the following: Figure 1 The first power supply switching circuit 211 includes a first upper switch Q1a and a first lower switch Q1b connected in series. The first upper switch Q1a and the first lower switch Q1b can be, for example, but not limited to, an N-channel enhancement-mode MOSFET (metal-oxide-semiconductor field-effect transistor). The gate and drain of the first upper switch Q1a are electrically connected to the first power supply driver 212 and the power supply 10, respectively. The source of the first upper switch Q1a is electrically connected to the drain of the first lower switch Q1b, the gate of the first lower switch Q1b is electrically connected to the first power supply driver 212, and the source of the first lower switch Q1b is grounded. The first terminal of the first power supply resonant capacitor C1 is electrically connected to the source of the first upper switch Q1a and the drain of the first lower switch Q1b, and the second terminal of the first power supply resonant capacitor C1 is electrically connected to the first node 20a.

[0109] The second power supply switching circuit 221 includes a second upper switch Q2a and a second lower switch Q2b connected in series. The second upper switch Q2a and the second lower switch Q2b can be, for example, but not limited to, an N-channel enhancement-mode MOSFET. The gate and drain of the second upper switch Q2a are electrically connected to the second power supply driver 222 and the power supply 10, respectively. The source of the second upper switch Q2a is electrically connected to the drain of the second lower switch Q2b. The gate of the second lower switch Q2b is electrically connected to the second power supply driver 222, and the source of the second lower switch Q2b is grounded. The first terminal of the second power supply resonant capacitor C2 is electrically connected to the source of the second upper switch Q2a and the drain of the second lower switch Q2b, and the second terminal of the second power supply resonant capacitor C2 is electrically connected to the first node 20a.

[0110] The first power-receiving switch circuit 311 includes a first upper switch Q1A and a first lower switch Q1B connected in series. The first upper switch Q1A and the first lower switch Q1B can be, for example, but not limited to, an N-channel enhancement-mode MOSFET (metal-oxide-semiconductor field-effect transistor). The gate and drain of the first upper switch Q1A are electrically connected to the output terminal 1a of the first power-receiving driver 312 and the inductive power supply 1, respectively. The source of the first upper switch Q1A is electrically connected to the drain of the first lower switch Q1B. The gate of the first lower switch Q1B is electrically connected to the first power-receiving driver 312, and the source of the first lower switch Q1B is grounded. The first terminal of the first power-receiving capacitor C1a is electrically connected to the source of the first upper switch Q1A and the drain of the first lower switch Q1B, and the second terminal of the first power-receiving capacitor C1a is electrically connected to the first node 30a.

[0111] The second power-receiving switch circuit 321 includes a second upper switch Q2A and a second lower switch Q2B connected in series. The second upper switch Q2A and the second lower switch Q2B can be, for example, but not limited to, an N-channel enhancement-mode MOSFET. The gate and drain of the second upper switch Q2A are electrically connected to the output terminal 1a of the second power-receiving driver 322 and the inductive power supply 1, respectively. The source of the second upper switch Q2A is electrically connected to the drain of the second lower switch Q2B, the gate of the second lower switch Q2B is electrically connected to the second power-receiving driver 322, and the source of the second lower switch Q2B is grounded. The first terminal of the second power-receiving capacitor C2a is electrically connected to the source of the second upper switch Q2A and the drain of the second lower switch Q2B, and the second terminal of the second power-receiving capacitor C2a is electrically connected to the first node 30a.

[0112] In some embodiments, disabling the first power supply drive module 21 by the power supply controller 4a means fixing the first power supply drive signal DR1 at a high or low potential, or turning off both the first upper switch Q1A and the first lower switch Q1B of the first power supply drive module 21 through the first power supply drive signal DR1. Similarly, disabling the second power supply drive module 22 by the power supply controller 4a means fixing the second power supply drive signal DR2 at a high or low potential, or turning off both the second upper switch Q2A and the second lower switch Q2B of the second power supply drive module 22 through the second power supply drive signal DR2.

[0113] In some embodiments, to prevent damage to the first power receiving switch circuit 311 and the second power receiving switch circuit 321 caused by abnormal voltage at the output terminal 1a of the inductive power supply 1, the power receiving terminal 3 of the inductive power supply 1 further includes a first blocking switch Pa and a second blocking switch Pb. The first blocking switch Pa is electrically connected between the first upper switch Q1A and the output terminal 1a of the inductive power supply 1, and is controlled by the power receiving controller 4b. The first blocking switch Pa can be turned off by the power receiving controller 4b when the voltage at the output terminal 1a of the inductive power supply 1 is abnormal. The second blocking switch Pb is electrically connected between the second upper switch Q2A and the output terminal 1a of the inductive power supply 1, and is controlled by the power receiving controller 4b. The second blocking switch Pb can be turned off by the controller 4b when the voltage at the output terminal 1a of the inductive power supply 1 is abnormal. Figure 1 In the embodiment shown, the first blocking switch Pa and the second blocking switch Pb are P-channel MOSFETs, respectively.

[0114] In some embodiments, when the power receiving controller 4b receives DC power from the auxiliary rectifier 330, the first power receiving drive module 31 and the second power receiving drive module 32 are initially in a stopped state, while the first blocking switch Pa and the second blocking switch Pb are initially in an open state.

[0115] In some embodiments, the power receiving terminal 3 further includes an output capacitor Crx, electrically connected between the output terminal 1a of the inductive power supply 1 and the ground terminal. Additionally, the power receiving terminal 3 also includes a current detector 34a, electrically connected between the power receiving drive modules (i.e., the first power receiving drive module 31 and the second power receiving drive module 32) and the output terminal 1a of the inductive power supply 1, used to detect the current on the output terminal 1a of the inductive power supply 1, and correspondingly generate a current detection signal Cf to the power receiving controller 4b, causing the power receiving controller 4b to control the operation of the first power receiving drive module 31 and the second power receiving drive module 32 according to the current detection signal Cf, thereby adjusting the magnitude of the current on the output terminal 1a of the power supply 1. Furthermore, the power receiving terminal 3 also includes a second power receiving signal processor 5c, which is electrically connected to the output capacitor Crx and the power receiving controller 4b. The second power receiving signal processor 5c processes the voltage on the output capacitor Crx into a voltage detection signal Vf, which is then provided to the power receiving controller 4b. The power receiving controller 4b controls the operation of the first power receiving drive module 31 and the second power receiving drive module 328 according to the voltage detection signal Vf, thereby adjusting the voltage at the output terminal 1a of the power supply 1. The second power receiving signal processor 5c can employ an appropriate signal processor according to actual needs, and its specific implementation is not limited in this disclosure. For example, the second power receiving signal processor 5c may include an analog-to-digital converter, which converts the current detection signal into a digital signal and provides it to the power receiving controller 4b.

[0116] Please refer to the following: Figure 2 , Figure 3 and Figure 4 and cooperate Figure 1 ,in Figure 2 for Figure 1 The diagram shows the timing sequence of voltage parameters at the receiving end of the inductive power supply. Figure 3 for Figure 1 The diagram shows the operating waveforms of the upper and lower switches of any power supply switch circuit in the first embodiment when the power receiving drive module of the inductive power supply is turned on. Figure 4 for Figure 1 The diagram shows the waveforms of the upper and lower switches of any power supply switch circuit in the second embodiment when the power receiving drive module of the inductive power supply is turned on. Since the first power receiving signal processor 5b obtains the power receiving resonant signal RTa from the first node 30a of the power receiving coil 30, when the power receiving resonant signal RTa of the first node 30a changes from a positive voltage to a negative voltage, the power receiving conversion signal Ra correspondingly forms a falling edge. Furthermore, in some embodiments, the power receiving controller 4b sets the time elapsed between two consecutive falling edges of the power receiving conversion signal Ra as the resonant period, and when the resonant period falls within the range of a preset resonant period, it calculates the first time position at 1 / 4 of the resonant period (e.g., ...). Figure 3 The time point t1 shown, or for example Figure 4 The time point t3 shown and the second time position at 3 / 4 of the resonance period (e.g.) Figure 3 The time point t2 shown, or for example Figure 3 At time point t4, the power receiver controller 4b further controls the duty cycle of the upper and lower switches of each power receiving drive module according to the output demand of the inductive power supply 1. The center point of the conduction time of one of the upper and lower switches of each power receiving drive module controlled by the power receiver controller 4b corresponds to the first time position, and the center point of the conduction time of the other switch corresponds to the second time position. Through the control method of the power receiver controller 4b described above, the conduction of the upper and lower switches of each power receiving drive module at the time when the receiving coil 30 performs positive and negative voltage conversion can be avoided, thereby preventing malfunctions of the upper and lower switches of the power receiving drive module. As can be seen from the above, this disclosure performs rectification control on the power receiving drive module to avoid malfunctions of the upper and lower switches of the power receiving drive module.

[0117] exist Figure 3 The example illustrates how the power-receiving controller 4b controls the upper and lower switches of each power-receiving drive module, extending from a first time position at 1 / 4 of the resonant period and a second time position at 3 / 4 of the resonant period, respectively, to form a duty cycle of 5%. Figure 4In the example, the power controller 4b controls the upper and lower switches of each power drive module to extend from the first time position of 1 / 4 of the resonant period and the second time position of 3 / 4 of the resonant period respectively to form a duty cycle of 20%.

[0118] In the foregoing embodiments, both the power supply terminal 2 and the power receiving terminal 3 of the inductive power supply 1 adopt a half-bridge architecture. However, this disclosure is not limited thereto. For example, the power supply terminal and the power receiving terminal of the inductive power supply may also adopt a full-bridge architecture, as detailed below.

[0119] Please see Figure 5 This is a schematic diagram of the structure of an inductive power supply according to the second embodiment of this disclosure, wherein... Figure 1 Components with similar structures and functions are represented by the same reference numerals and will not be described again here. In this embodiment, the power supply terminal 2 of the inductive power supply 1b further includes a third power supply drive module 23, a fourth power supply drive module 24, and a second power supply signal processor 6a. The third power supply drive module 23 includes a third power supply resonant capacitor C3, a third power supply switching circuit 231, and a third power supply driver 232. The third power supply switching circuit 231 is electrically connected to the power supply 10 and is electrically connected between the third power supply resonant capacitor C3 and the third power supply driver 232. The third power supply resonant capacitor C3 is also electrically connected to the second node 20b. The third power supply driver 232 is used to drive the third power supply switching circuit 231. The third power supply resonant capacitor C3 is in different potential states according to the switching action of the third power supply switching circuit 231.

[0120] The fourth power supply drive module 24 is connected in parallel to the third power supply drive module 23. The fourth power supply drive module 24 includes a fourth power supply resonant capacitor C4, a fourth power supply switching circuit 241, and a fourth power supply driver 242. The fourth power supply switching circuit 241 is electrically connected to the power supply 10 and is also electrically connected between the fourth power supply resonant capacitor C4 and the fourth power supply driver 242. The fourth power supply resonant capacitor C4 is also electrically connected to the second node 20b. The fourth power supply driver 242 drives the fourth power supply switching circuit 241. The fourth power supply resonant capacitor C4 is in different potential states depending on the switching action of the fourth power supply switching circuit 241.

[0121] The power supply controller 4a is also electrically connected to the third power supply drive module 23 and the fourth power supply drive module 24, and provides the third power supply drive signal DR3 and the fourth power supply drive signal DR4 to the third power supply driver 232 of the third power supply drive module 23 and the fourth power supply driver 242 of the fourth power supply drive module 24, respectively. The third power supply driver 232 drives the third power supply switching circuit 231 according to the third power supply drive signal DR3, and the fourth power supply driver 242 drives the fourth power supply switching circuit 241 according to the fourth power supply drive signal DR4. The third power supply drive signal DR3 and the fourth power supply drive signal DR4 can be, for example, but not limited to, pulse width modulation signals. The second power supply signal processor 6a is electrically connected to the second node 20b of the power supply coil 20 and the power supply controller 4a, and is used to continuously receive the second power supply resonant signal RT2 from the second node 20b, process it, and provide the second power supply conversion signal R2 to the power supply controller 4a. The second power supply signal processor 6a can use an appropriate signal processor according to actual needs, and its specific implementation is not limited in this disclosure. For example, the second power supply signal processor 6a may include an analog-to-digital converter, which converts the second power supply resonant signal RT2 into a second power supply conversion signal R2 and provides it to the power supply controller 4a.

[0122] The circuit structures of the third power supply switch circuit 231 and the fourth power supply switch circuit 241 are described in detail below.

[0123] Please refer to the following: Figure 5 The third power supply switching circuit 231 includes a third upper switch Q3a and a third lower switch Q3b connected in series. The third upper switch Q3a and the third lower switch Q3b can be, for example, but not limited to, an N-channel enhancement-mode MOSFET. The gate and drain of the third upper switch Q3a are electrically connected to the third power supply driver 232 and the power supply 10, respectively. The source of the third upper switch Q3a is electrically connected to the drain of the third lower switch Q3b. The gate of the third lower switch Q3b is electrically connected to the third power supply driver 232, and the source of the third lower switch Q3b is grounded. The first terminal of the third power supply resonant capacitor C3 is electrically connected to the source of the third upper switch Q3a and the drain of the third lower switch Q3b, and the second terminal of the third power supply resonant capacitor C3 is electrically connected to the second node 20b.

[0124] The fourth power supply switching circuit 241 includes a fourth upper switch Q4a and a fourth lower switch Q4b connected in series. The fourth upper switch Q4a and the fourth lower switch Q4b can be, for example, but not limited to, an N-channel enhancement-mode MOSFET. The gate and drain of the fourth upper switch Q4a are electrically connected to the fourth power supply driver 242 and the power supply 10, respectively. The source of the fourth upper switch Q4a is electrically connected to the drain of the fourth lower switch Q4b. The gate of the fourth lower switch Q4b is electrically connected to the fourth power supply driver 242, and the source of the fourth lower switch Q4b is grounded. The first terminal of the fourth power supply resonant capacitor C4 is electrically connected to the source of the fourth upper switch Q4a and the drain of the fourth lower switch Q4b, and the second terminal of the fourth power supply resonant capacitor C4 is electrically connected to the second node 20b.

[0125] The receiving terminal 3 of the inductive power supply 1b further includes a third power receiving drive module 33 and a fourth power receiving drive module 34. The third power receiving drive module 33 includes a third power receiving capacitor C3a, a third power receiving switch circuit 331, and a third power receiving driver 332. The third power receiving switch circuit 331 is electrically connected to the output terminal 1a of the inductive power supply 1, and is also electrically connected between the third power receiving capacitor C3a and the third power receiving driver 332. The third power receiving capacitor C3a is also electrically connected to the first node 30a. The third power receiving driver 332 is used to drive the third power receiving switch circuit 331, and the third power receiving capacitor C3a is in different potential states according to the switching action of the third power receiving switch circuit 331.

[0126] The fourth power-receiving drive module 34 is connected in parallel to the third power-receiving drive module 33. The fourth power-receiving drive module 34 includes a fourth power-receiving capacitor C4a, a fourth power-receiving switch circuit 341, and a fourth power-receiving driver 342. The fourth power-receiving switch circuit 341 is electrically connected to the output terminal 1a of the inductive power supply 1 and is also electrically connected between the fourth power-receiving capacitor C4a and the fourth power-receiving driver 342. The fourth power-receiving capacitor C4a is also electrically connected to the first node 30a. The fourth power-receiving driver 342 is used to drive the fourth power-receiving switch circuit 341. The fourth power-receiving capacitor C4a is in different potential states according to the switching action of the fourth power-receiving switch circuit 341.

[0127] The power receiver controller 4b is also electrically connected to the third power receiver drive module 33 and the fourth power receiver drive module 34, and provides the third power receiver drive signal DRc and the fourth power receiver drive signal DRd to the third power receiver driver 332 of the third power receiver drive module 33 and the fourth power supply driver 342 of the fourth power receiver drive module 34, respectively. The third power receiver driver 332 drives the third power receiver switch circuit 331 according to the third power receiver drive signal DRc, and the fourth power receiver driver 342 drives the fourth power receiver switch circuit 341 according to the fourth power supply drive signal DRd. The third power receiver drive signal DRc and the fourth power receiver drive signal DRd can be, for example, but not limited to, pulse width modulation signals.

[0128] The circuit structures of the third power receiving switch circuit 331 and the fourth power receiving switch circuit 341 are described in detail below.

[0129] Please refer to the following: Figure 5 The third power receiving switch circuit 331 includes a third upper switch Q3A and a third lower switch Q3B connected in series. The third upper switch Q3A and the third lower switch Q3B can be, for example, but not limited to, an N-channel enhancement-mode MOSFET (metal-oxide-semiconductor field-effect transistor). The gate and drain of the third upper switch Q3A are electrically connected to the output terminal 1a of the third power supply driver 332 and the inductive power supply 1, respectively. The source of the third upper switch Q3A is electrically connected to the drain of the third lower switch Q3B. The gate of the third upper switch Q3A is electrically connected to the third power receiving driver 332, and the source of the third lower switch Q3B is grounded. The first terminal of the third power supply resonant capacitor C3a is electrically connected to the source of the third upper switch Q3A and the drain of the third lower switch Q3B, and the second terminal of the third power supply resonant capacitor C3a is electrically connected to the first node 30a.

[0130] The fourth power-receiving switch circuit 341 includes a fourth upper switch Q4A and a fourth lower switch Q4B connected in series. The fourth upper switch Q4A and the fourth lower switch Q4B can be, for example, but not limited to, N-channel enhancement-mode MOSFETs. The gate and drain of the fourth upper switch Q4A are electrically connected to the output terminal 1a of the fourth power-receiving driver 342 and the inductive power supply 1, respectively. The source of the fourth upper switch Q4A is electrically connected to the drain of the fourth lower switch Q4B, the gate of the fourth lower switch Q4B is electrically connected to the fourth power-receiving driver 342, and the source of the fourth lower switch Q4B is grounded. The first terminal of the fourth power-receiving capacitor C4a is electrically connected to the source of the fourth upper switch Q4A and the drain of the fourth lower switch Q4B, and the second terminal of the fourth power-receiving capacitor C4a is electrically connected to the first node 30a.

[0131] Figure 6 This is a flowchart illustrating an operation method of an inductive power supply according to an embodiment of the present disclosure. The operation method of the inductive power supply in this embodiment is applicable to... Figure 1 The inductive power supply 1 shown or Figure 5 The inductive power supply 1b is shown. Please refer to [link / reference]. Figure 6 and pair Figure 1 The operation method of this embodiment includes the following steps.

[0132] Step S1: Provide a power supply terminal 2 and a power receiving terminal 3 for the inductive power supply 1, wherein the power supply terminal 2 is connected to the power supply 10 and includes a power supply coil 20 and a power supply drive module (e.g., Figure 1The first power supply drive module 21 and the second power supply drive module 22 shown are or Figure 5 The first power supply drive module 21, the second power supply drive module 22, the third power supply drive module 23, and the fourth power supply drive module 24 shown, and the power supply controller 4a, are shown. The power supply coil 20 has a first node 20a and a second node 20b at its two ends, respectively. The power supply drive module includes a power supply resonant capacitor, a power supply switching circuit, and a power supply driver. The power supply switching circuit is electrically connected between the power supply 10, the power supply resonant capacitor, and the power supply driver. The power supply resonant capacitor is also electrically connected to the first node 20a. The power supply controller 4a is electrically connected to the power supply drive module. The receiving end 3 is designed to receive power from the power supply end 2 in an inductive manner and includes a receiving coil 30 and a plurality of receiving drive modules (e.g., ...). Figure 1 The first powered drive module 31 and the second powered drive module 32 shown are or Figure 5 The diagram shows a first power-driven module 31, a second power-driven module 32, a third power-driven module 33, and a fourth power-driven module 34), a power-controlled controller 4b, and a first power-controlled signal processor 5b. A power-receiving coil 30 is electromagnetically coupled to a power supply coil 20, and has a first node 30a and a second node 30b at its two ends. Each power-driven module includes a power-receiving capacitor, a power-receiving switch circuit, and a power-receiving driver. The power-receiving switch circuit is connected to the output terminal 1a of the inductive power supply 1 and is electrically connected between the power-receiving capacitor and the power-receiving driver. The power-receiving capacitor is also electrically connected to the first node 30a. The power-controlled controller 4b is electrically connected to a plurality of power-driven modules, and the first power-controlled signal processor 5b is electrically connected to the first node 30a and the power-controlled controller 4b.

[0133] In step S2, the power supply controller 4a provides a power supply drive signal to the power supply drive module, so that the power supply driver drives the power supply switch circuit according to the power supply drive signal. The power receiving controller provides a plurality of power receiving drive signals to the power receiving drive module, so that the power receiving driver in each power receiving drive module drives the power receiving switch circuit according to the power receiving drive signal.

[0134] Step S3: The power supply controller 4a enables or disables the power supply drive module through the power supply drive signal to control the power supply terminal 2 to be in the power transmission state or the self-resonance state.

[0135] In step S4, the first power signal processor 5b continuously receives the power resonant signal RTa on the power receiving coil 30 and converts it to provide it to the power receiving controller 4b.

[0136] Step S5: When the resonant frequency of the power receiving resonant signal RTa is lower than the preset frequency, the power receiving controller 4b determines that the power supply terminal 2 is in a self-resonant state. When the power supply terminal 2 is in a self-resonant state, the power receiving controller 4b obtains the distance between the power supply coil 20 and the power receiving coil 30 according to the resonant frequency. Based on the distance between the power supply coil 20 and the power receiving coil 30, the power receiving controller 4b adjusts the number of activated power receiving drive modules through the power receiving drive signal.

[0137] In some embodiments, step S2 further includes the power receiver 4b setting the time elapsed between two consecutive falling edges of the power conversion signal Ra as the resonant period, and when the resonant period is within the range of the preset resonant period, calculating a first time position at 1 / 4 of the resonant period and a second time position at 3 / 4 of the resonant period. The power receiver 4b further controls the duty cycle of the upper and lower switches of each power-driven module according to the output demand of the inductive power supply 1. The center point of the conduction time of one of the upper and lower switches of each power-driven module controlled by the power receiver 4b corresponds to the first time position, and the center point of the conduction time of the other switch of the upper and lower switches corresponds to the second time position.

[0138] In summary, this disclosure provides an inductive power supply with variable capacitor and rectification control, and its operating method. When the power supply terminal is in a self-resonant state, the receiving end of the inductive power supply measures the resonant frequency to obtain the distance between the power supply coil and the receiving coil. Then, according to the distance between the power supply coil at the power supply terminal and the receiving coil at the receiving end, the number of capacitors at the receiving end is adjusted accordingly, thereby adjusting the resonant frequency. This allows the inductive power supply to achieve high efficiency regardless of the distance between the power supply coil and the receiving coil at the receiving end.

[0139] It should be noted that the above are merely preferred embodiments for illustrating this disclosure, and this disclosure is not limited to the described embodiments. The scope of this disclosure is determined by the scope of the patent application. Furthermore, this disclosure may be modified in various ways by those skilled in the art, but all such modifications shall not depart from the scope of protection sought in the patent application.

Claims

1. An inductive power supply, comprising: A power supply terminal, connected to a power source, and comprising: A power supply coil has a first node and a second node at its two ends; and A power supply drive module includes a power supply resonant capacitor, a power supply switching circuit, and a power supply driver, wherein, The power supply switch circuit is connected to the power supply and is electrically connected between the power supply resonant capacitor and the power supply driver. The power supply resonant capacitor is also electrically connected to the first node and resonates with the power supply coil. as well as A power supply controller is electrically connected to the power supply drive module and provides a power supply drive signal to the power supply drive module, causing the power supply driver to drive the power supply switching circuit according to the power supply drive signal. The power supply controller enables or disables the power supply drive module via the power supply drive signal to control the power supply terminal to be in a power transmission state or a self-resonant state accordingly. A power receiving end, configured to receive power from the power supply end in an inductive manner, and comprising: A receiving coil is electromagnetically coupled to the supplying coil, and has a first node and a second node at its two ends respectively; A plurality of powered drive modules are connected in parallel, wherein each powered drive module includes a powered capacitor, a powered switch circuit and a powered driver. The powered switch circuit is connected to an output terminal of the inductive power supply and is electrically connected between the powered capacitor and the powered driver. The powered capacitor is also electrically connected to the first node of the powered coil. A power controller is electrically connected to the plurality of power-driven modules and provides a plurality of power-driven coil drive signals to the plurality of power-driven modules, wherein in each power-driven module, the power driver drives the power-driven coil switching circuit according to the power-driven coil drive signal; and A first signal processor is electrically connected to the first node of the receiving coil and the receiving controller, and continuously receives a receiving resonant signal on the receiving coil and provides it to the receiving controller. The receiving controller determines that the power supply terminal is in the self-resonant state when the resonant frequency of the receiving resonant signal is lower than a preset frequency. When the power supply terminal is in the self-resonant state, the receiving controller obtains a distance between the power supply coil and the receiving coil according to the resonant frequency, and adjusts the number of activated receiving drive modules according to the distance.

2. The inductive power supply as claimed in claim 1, wherein the power receiver controller presets a first frequency and a second frequency, wherein the first frequency is the resonant frequency of the power receiving resonant signal when the power supply coil and the power receiving coil are closest, and the second frequency is the resonant frequency of the power receiving resonant signal when the power supply coil and the power receiving coil are at a set maximum sensing distance, and the power receiver controller further calculates the distance between the power supply coil and the power receiving coil based on the proportional relationship between the detected resonant frequency of the power receiving resonant signal and the first frequency and the second frequency.

3. The inductive power supply as claimed in claim 1, wherein the receiving end further includes an auxiliary rectifier electrically connected to the receiving coil and the receiving controller, for rectifying the electrical energy of the receiving coil to provide DC power to the receiving controller for operation.

4. The inductive power supply as claimed in claim 3, wherein the power receiving terminal further comprises a plurality of blocking switches, each of the blocking switches being electrically connected between the corresponding power receiving switch circuit and the output terminal of the inductive power supply, and being controlled by the power receiving controller, wherein the blocking switch is turned off by the controller when the voltage at the output terminal of the inductive power supply is abnormal.

5. The inductive power supply as claimed in claim 4, wherein after the power receiving controller receives the DC power provided by the auxiliary rectifier, an initial state of each power receiving drive module is to stop operating, and an initial state of each blocking switch is to be open.

6. The inductive power supply as claimed in claim 1, wherein the power receiver controller sets the time elapsed between two consecutive positive and negative voltage conversions of the power received resonant signal as a resonant period, and when the resonant period falls within the range of a preset resonant period, calculates a first time position at 1 / 4 of the resonant period and a second time position at 3 / 4 of the resonant period, and the power receiver controller further controls the duty cycle of an upper switch and a lower switch of each power received drive module according to the output demand of the inductive power supply, wherein the center point of the conduction time of one of the upper switch and the lower switch of each power received drive module controlled by the power receiver controller corresponds to the first time position, and the center point of the conduction time of the other switch of the upper switch and the lower switch corresponds to the second time position.

7. The inductive power supply as claimed in claim 1, wherein the number of powered drive modules is two to form a half-bridge architecture, or the number of powered drive modules is four to form a full-bridge architecture.

8. A method for operating an inductive power supply, comprising the following steps: (S1) Provide a power supply terminal and a power receiving terminal of the inductive power supply, wherein the power supply terminal includes a power supply coil, at least one power supply drive module and a power supply controller, the at least one power supply drive module includes a power supply resonant capacitor, a power supply switching circuit and a power supply driver, the power receiving terminal includes a power receiving coil, a plurality of power receiving drive modules, a power receiving controller and a first power receiving signal processor, each power receiving drive module includes a power receiving capacitor, a power receiving switching circuit and a power receiving driver; (S2) The power supply controller provides a power supply drive signal to the power supply drive module, so that the power supply driver drives the power supply switch circuit according to the power supply drive signal. The power receiving controller provides a plurality of power receiving drive signals to the power receiving drive module, so that the power receiving driver in each power receiving drive module drives the power receiving switch circuit according to the power receiving drive signal. (S3) The power supply controller enables or disables the power supply drive module through the power supply drive signal to control the power supply terminal to be in a power transmission state or a self-resonance state. (S4) The first power signal processor continuously receives a power resonant signal from the power receiving coil and provides it to the power receiving controller; and (S5) When the resonant frequency of the power receiving resonant signal is lower than a preset frequency, the power supply terminal is determined to be in the self-resonant state. When the power supply terminal is in the self-resonant state, the power receiving controller obtains a distance between the power supply coil and the power receiving coil based on the resonant frequency of the power receiving resonant signal on the power receiving coil. Based on the size of the distance, the power receiving controller adjusts the number of activated power receiving drive modules.

9. The operating method as described in claim 8, wherein the power receiving controller presets a first frequency and a second frequency, wherein the first frequency is the resonant frequency of the power receiving resonant signal when the power supply coil and the power receiving coil are closest, and the second frequency is the resonant frequency of the power receiving resonant signal when the power supply coil and the power receiving coil are at a set maximum sensing distance, and the power receiving controller further calculates the distance between the power supply coil and the power receiving coil based on the proportional relationship between the detected resonant frequency of the power receiving resonant signal and the first frequency and the second frequency.

10. The operating method as described in claim 8, wherein the power receiving end further includes an auxiliary rectifier electrically connected to the power receiving coil and the power receiving controller, for rectifying the electrical energy of the power receiving coil to provide DC power to the power receiving controller for operation.

11. The operating method of claim 10, wherein the power receiving end further comprises a plurality of blocking switches, each of the blocking switches being electrically connected between the corresponding power receiving switch circuit and the output terminal of the inductive power supply, and being controlled by the power receiving controller, wherein the blocking switch is turned off by the controller when the voltage at the output terminal of the inductive power supply is abnormal.

12. The operating method as claimed in claim 11, wherein after the power receiving controller receives the DC power provided by the auxiliary rectifier, an initial state of each power receiving drive module is to stop operating, and an initial state of each blocking switch is to be open.

13. The operating method as described in claim 8, wherein step (S2) further comprises: The power receiver controller sets the time elapsed between two consecutive positive and negative voltage transitions of the power received resonant signal as a resonant period. When the resonant period falls within a preset resonant period range, it calculates a first time position at 1 / 4 of the resonant period and a second time position at 3 / 4 of the resonant period. The power receiver controller further controls the duty cycle of an upper switch and a lower switch of each power received drive module according to the output demand of the inductive power supply. The center point of the conduction time of one of the upper and lower switches of each power received drive module controlled by the power receiver controller corresponds to the first time position, and the center point of the conduction time of the other switch of the upper and lower switches corresponds to the second time position.

14. The operating method as described in claim 8, wherein the number of powered drive modules is two to form a half-bridge architecture, or the number of powered drive modules is four to form a full-bridge architecture.

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