High-temperature wireless power supply synchronous error signal feedback circuit

Abstract

The application provides a high-temperature wireless power supply synchronous error signal feedback circuit, wherein a PWM control circuit, a primary error signal adjusting circuit, a reference and modulation frequency circuit and an error modulation circuit realize non-contact transmission of energy and signals through windings and a wireless coaxial magnetic assembly; the PWM control circuit is used for outputting a PWM signal according to a demodulated error signal; the reference and modulation frequency circuit is used for outputting a secondary modulation frequency reference Vpwm and a secondary reference voltage Vsref according to the PWM signal; the error modulation circuit is used for outputting a secondary error signal to the primary error signal adjusting circuit according to the secondary modulation frequency reference Vpwm and the secondary reference voltage Vsref; and the primary error signal adjusting circuit is used for outputting the demodulated error signal to the PWM control circuit according to the secondary error signal. The technical scheme of the application can solve the technical problem of inaccurate error feedback in a poor physical and electromagnetic environment in a well in the prior art.

Description

Technical Field

[0001] This invention relates to the field of oil drilling technology, and in particular to a synchronization error signal feedback circuit for high-temperature wireless power supply. Background Technology

[0002] In the field of oil drilling, the drilling characteristics of oil instruments dictate that the power supply for drilling components needs to be heat-resistant and capable of wireless power supply. Typically, in downhole environments, error sampling circuits need to operate stably in ambient temperatures of 180℃-230℃. Conventional feedback devices such as optocouplers and voltage references can no longer function properly. At the same time, due to wireless power supply during drilling, the primary and secondary windings rotate continuously, resulting in significant radiated interference. Feedback circuits typically lack the anti-interference capability for the corresponding frequencies. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] This invention provides a synchronization error signal feedback circuit for high-temperature wireless power supply. The circuit includes a PWM control circuit, a primary error signal conditioning circuit, a reference and modulation frequency circuit, an error modulation circuit, and a wireless coaxial magnetic component. The PWM control circuit, primary error signal conditioning circuit, reference and modulation frequency circuit, and error modulation circuit respectively achieve contactless energy and signal transfer with the wireless coaxial magnetic component through windings. The PWM control circuit outputs a PWM signal based on the demodulated error signal. The reference and modulation frequency circuit outputs a secondary modulation frequency reference Vpwm and a secondary reference voltage Vsref based on the PWM signal. The error modulation circuit outputs a secondary error signal to the primary error signal conditioning circuit based on the secondary modulation frequency reference Vpwm and the secondary reference voltage Vsref. The primary error signal conditioning circuit outputs a demodulated error signal to the PWM control circuit based on the secondary error signal.

[0005] Furthermore, the PWM control circuit includes a resistor R1, a diode D1, a capacitor C1, a PWM chip IC1, and a capacitor C2. Capacitor C1 is connected to the wireless power supply Vcc and the wireless coaxial magnetic component. Resistor R1 is connected to the wireless power supply Vcc and the negative terminal of diode D1, and the positive terminal of diode D1 is connected to the wireless coaxial magnetic component. PWM chip IC1 is connected to capacitor C1 to provide operating voltage for PWM chip IC1. PWM chip IC1 outputs a PWM signal Vg based on the demodulated error signal Verr. Capacitor C2 is connected to both PWM chip IC1 and the wireless coaxial magnetic component.

[0006] Furthermore, the PWM chip IC1 is a six-pin PWM chip. Pin 2 of the PWM chip IC1 receives the demodulated error signal Verr, pin 6 outputs the PWM signal Vg, pin 7 inputs the wireless power supply Vcc, and pin 5 is grounded.

[0007] Furthermore, the wireless coaxial magnetic component includes winding T1 and winding T2. Winding T1 is a wireless power supply winding, and winding T2 is a reverse winding with the same terminal. Capacitor C2 is connected to the first input terminal of winding T2 to provide a PWM waveform for winding T2. The first output terminal of winding T2 is grounded, and winding T2 outputs a switching waveform according to the PWM waveform.

[0008] Furthermore, the reference and modulation frequency circuit includes a PWM signal rectifier circuit and a filter circuit. The PWM signal rectifier circuit is connected to the winding T2 to obtain the secondary modulation frequency reference Vpwm. The filter circuit is connected in parallel with the PWM signal rectifier circuit and filters the secondary modulation frequency reference Vpwm to obtain the secondary reference voltage Vsref.

[0009] Furthermore, the PWM signal rectifier circuit includes: capacitor C3, diode D5, diode D2, resistor R4, MOSFET Q1, and capacitor C4. Capacitor C3 is connected to the second output terminal of winding T2. The cathode of diode D5 is connected to capacitor C3, the anode of diode D2, and the gate of MOSFET Q1. Resistor R4 is connected to the cathode of diode D2 and the source of MOSFET Q1. Capacitor C4 is connected to the source of MOSFET Q1. The second input terminal of winding T2, the anode of diode D5, the drain of MOSFET Q1, and capacitor C4 are grounded. The secondary modulation frequency reference Vpwm is output between resistor R4 and capacitor C4.

[0010] Furthermore, the filter circuit includes a diode D3 and a capacitor C5. The positive terminal of the diode D3 is connected to the source of the MOSFET Q1, and the negative terminal of the diode D3 is connected to the capacitor C5. The capacitor C5 is grounded, and a secondary reference voltage Vsref is output between the negative terminal of the diode D3 and the capacitor C5.

[0011] Furthermore, the wireless coaxial magnetic component also includes a winding T3, which is a winding with the same name and direction. The error modulation circuit includes a feedback circuit, a MOSFET Q2, and a capacitor C9. The feedback circuit collects the first output voltage Vout1 and compares it with the secondary reference voltage Vsref to output the secondary error level to the winding T3. One end of the capacitor C9 is input to the secondary modulation frequency reference Vpwm, and the other end is connected to the gate of the MOSFET Q2. The source of the MOSFET Q2 is connected to the winding T3, and the drain of the MOSFET Q2 is grounded.

[0012] Furthermore, the primary error signal conditioning circuit includes a diode D6, a capacitor C7, and a protection circuit. The positive terminal of the diode D6 is connected to the second input terminal of the winding T3, and the negative terminal of the diode D6 is connected to the capacitor C7. The protection circuit is connected in parallel with the capacitor C7. The demodulated error signal Verr is output between the negative terminal of the diode D6 and the capacitor C7. The capacitor C7 and the second output terminal of the winding T3 are both grounded.

[0013] Furthermore, the protection circuit includes: resistor R8, MOSFET Q3 and capacitor C8. Resistor R8 is connected to the cathode of diode D6 and the source of MOSFET Q3, respectively. The gate of MOSFET Q3 is connected to one end of capacitor C8, the other end of capacitor C8 is connected to PWM signal Vg, and the drain of MOSFET Q3 is grounded.

[0014] The present invention provides a synchronization error signal feedback circuit for high-temperature wireless power supply. This circuit, by incorporating a PWM control circuit, a primary error signal adjustment circuit, a reference and modulation frequency circuit, an error modulation circuit, and a wireless coaxial magnetic component, achieves synchronization error signal feedback in high-temperature operating environments using wireless power supply, exhibiting strong modulation and demodulation anti-interference capabilities. Compared with existing technologies, the present invention solves the problem of inaccurate error feedback in harsh physical and electromagnetic environments underground. Attached Figure Description

[0015] The accompanying drawings, which form part of this specification, are provided to further illustrate embodiments of the invention and, together with the textual description, explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0016] Figure 1 A schematic diagram of a synchronization error signal feedback circuit for high-temperature wireless power supply according to a specific embodiment of the present invention is shown. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0020] like Figure 1As shown in the figure, a high-temperature wireless power supply synchronization error signal feedback circuit is provided according to a specific embodiment of the present invention. The high-temperature wireless power supply synchronization error signal feedback circuit includes: a PWM control circuit, a primary error signal conditioning circuit, a reference and modulation frequency circuit, an error modulation circuit, and a wireless coaxial magnetic component. The PWM control circuit, the primary error signal conditioning circuit, the reference and modulation frequency circuit, and the error modulation circuit respectively achieve non-contact energy and signal transfer through windings and the wireless coaxial magnetic component. The PWM control circuit is used to output a PWM signal according to the demodulated error signal. The wireless coaxial magnetic component is used to provide a switching waveform for the reference and modulation frequency circuit according to the PWM waveform corresponding to the PWM signal. The reference and modulation frequency circuit is used to output a secondary modulation frequency reference and a secondary reference voltage according to the switching waveform. The error modulation circuit is used to output a secondary error signal to the primary error signal conditioning circuit according to the secondary modulation frequency reference and the secondary reference voltage. The primary error signal conditioning circuit is used to output a demodulated error signal to the PWM control circuit according to the secondary error signal.

[0021] This configuration provides a synchronization error signal feedback circuit for high-temperature wireless power supply. This circuit, by incorporating a PWM control circuit, a primary error signal adjustment circuit, a reference and modulation frequency circuit, an error modulation circuit, and a wireless coaxial magnetic component, achieves synchronization error signal feedback in high-temperature operating environments using wireless power supply, exhibiting extremely strong modulation and demodulation anti-interference capabilities. Compared with existing technologies, the technical solution of this invention can solve the technical problem of inaccurate error feedback in harsh physical and electromagnetic environments downhole.

[0022] Furthermore, in this invention, to enable the PWM control circuit to output a PWM signal based on the demodulated error signal, the PWM control circuit can be configured to include a resistor R1, a diode D1, a capacitor C1, a PWM chip IC1, and a capacitor C2. Capacitor C1 is connected to the wireless power supply Vcc and the wireless coaxial magnetic component, respectively. Resistor R1 is connected to the wireless power supply Vcc and the negative terminal of diode D1, respectively. The positive terminal of diode D1 is connected to the wireless coaxial magnetic component. PWM chip IC1 is connected to capacitor C1 to provide operating voltage for PWM chip IC1. PWM chip IC1 outputs a PWM signal Vg based on the demodulated error signal Verr. Capacitor C2 is connected to PWM chip IC1 and the wireless coaxial magnetic component.

[0023] In a specific embodiment of the present invention, the PWM chip IC1 can be configured as a six-pin PWM chip. Pin 2 of the PWM chip IC1 receives the demodulated error signal Verr, pin 6 outputs the PWM signal Vg, pin 7 inputs the wireless power supply Vcc, and pin 5 is grounded. The PWM chip IC1 provides power transistor drive for the wireless power supply. The wireless coaxial magnetic assembly includes windings T1 and T2. Winding T1 is the wireless power supply winding, and winding T2 is a reverse winding with the same terminals. Capacitor C2 is connected to the first input terminal of winding T2 to provide a PWM waveform for winding T2. The first output terminal of winding T2 is grounded, and winding T2 outputs a switching waveform according to the PWM waveform. In this embodiment, the switching waveform is a square wave.

[0024] Furthermore, in this invention, to enable the reference and modulation frequency circuit to output a secondary modulation frequency reference and a secondary reference voltage based on the switching waveform, the reference and modulation frequency circuit can be configured to include a PWM signal rectifier circuit and a filter circuit. The PWM signal rectifier circuit is connected to winding T2 to restore the ±Vg / 2 voltage generated by capacitor C2 back to Vg voltage, which is used as the secondary modulation frequency reference Vpwm. The filter circuit is connected in parallel with the PWM signal rectifier circuit, and filters the secondary modulation frequency reference Vpwm to obtain the secondary reference voltage Vsref. In this invention, the reference and modulation frequency circuit rectifies and outputs the secondary reference voltage Vsref based on the switching waveform given by winding T2, and the secondary reference voltage Vsref is approximately equal to Vcc-2V.

[0025] In a specific embodiment of the present invention, the PWM signal rectifier circuit includes: capacitor C3, diode D5, diode D2, resistor R4, MOSFET Q1, and capacitor C4. Capacitor C3 is connected to the second output terminal of winding T2. The cathode of diode D5 is connected to capacitor C3, the anode of diode D2, and the gate of MOSFET Q1. Resistor R4 is connected to the cathode of diode D2 and the source of MOSFET Q1. Capacitor C4 is connected to the source of MOSFET Q1. The second input terminal of winding T2, the anode of diode D5, the drain of MOSFET Q1, and capacitor C4 are grounded. A secondary modulation frequency reference Vpwm is output between resistor R4 and capacitor C4. The filter circuit includes diode D3 and capacitor C5. The anode of diode D3 is connected to the source of MOSFET Q1, and the cathode of diode D3 is connected to capacitor C5. Capacitor C5 is grounded. A secondary reference voltage Vsref is output between the cathode of diode D3 and capacitor C5.

[0026] Furthermore, in this invention, in order to enable the error modulation circuit to output a secondary error signal to the primary error signal adjustment circuit based on the secondary modulation frequency reference and the secondary reference voltage, the configurable wireless coaxial magnetic component further includes a winding T3, which is a winding with the same name and direction. The error modulation circuit includes a feedback circuit, a MOSFET Q2, and a capacitor C9. The feedback circuit collects the first output voltage Vout1 and compares it with the secondary reference voltage Vsref to output a secondary error level to the winding T3. One end of the capacitor C9 is input to the secondary modulation frequency reference Vpwm, and the other end is connected to the gate of the MOSFET Q2. The source of the MOSFET Q2 is connected to the winding T3, and the drain of the MOSFET Q2 is grounded. In this invention, capacitor C9 re-blocks the secondary modulation frequency reference Vpwm and provides a driving waveform of ±Vpwm / 2 to MOSFET Q2. The secondary error level is modulated into a square wave by capacitor C9 and MOSFET Q2 and transmitted to winding T3. Winding T3 is an error signal feedback winding with the same direction of the same terminals. Winding T3 transmits the secondary error level modulated by the feedback circuit to the primary error signal adjustment circuit.

[0027] As a specific embodiment of the present invention, the feedback circuit includes resistor R6, resistor R7, capacitor C6, and operational amplifier U1B. One end of resistor R6 is connected to the first output voltage Vout1, and the other end is connected to resistor R7, capacitor C6, and the inverting input terminal of operational amplifier U1B respectively. Resistor R7 is grounded. The non-inverting input terminal of operational amplifier U1B receives the secondary reference voltage Vsref. The output terminals of capacitor C6 and operational amplifier U1B are both connected to the first input terminal of winding T3. The source of MOSFET Q2 is connected to the first output terminal of winding T3. The gate of MOSFET Q2 is connected to capacitor C9. Capacitor C9 is connected to the secondary modulation frequency reference Vpwm. The drain of MOSFET Q2 is grounded.

[0028] Furthermore, in this invention, to enable the primary error signal conditioning circuit to output a demodulated error signal to the PWM control circuit based on the secondary error signal, the primary error signal conditioning circuit can be configured to include a diode D6, a capacitor C7, and a protection circuit. The anode of diode D6 is connected to the second input terminal of winding T3, and the cathode of diode D6 is connected to capacitor C7. The protection circuit is connected in parallel with capacitor C7, and the demodulated error signal Verr is output between the cathode of diode D6 and capacitor C7. Both capacitor C7 and the second output terminal of winding T3 are grounded. In this invention, the primary error signal conditioning circuit demodulates the modulation signal of winding T3 through diode D6 and capacitor C7, outputting a near-DC demodulated error signal Verr. The demodulated error signal Verr is then transmitted to the PWM chip IC1 of the PWM control circuit.

[0029] In a specific embodiment of the present invention, the protection circuit includes: a resistor R8, a MOSFET Q3, and a capacitor C8. Resistor R8 is connected to the cathode of diode D6 and the source of MOSFET Q3, respectively. The gate of MOSFET Q3 is connected to one end of capacitor C8, and the other end of capacitor C8 is connected to the PWM signal Vg. The drain of MOSFET Q3 is grounded. In this invention, the PWM signal Vg drives MOSFET Q3 through capacitor C8. When the power is off and Vg is 0, MOSFET Q3 is quickly turned on to discharge the demodulated error signal Verr, preventing overshoot of the first output voltage Vout1 during power-off, or overshoot of the first output voltage during continuous power-on due to charge in the error modulation circuit and capacitor C7.

[0030] In the high-temperature wireless power supply synchronization error signal feedback circuit of this invention, there are no temperature-sensitive or temperature-resistant components such as voltage references and optocouplers. All circuits in this invention can use high-temperature components, and the design meets the working environment requirements of 180 to 230°C in downhole environments. In this invention, all modulation and demodulation frequencies are derived from PWM drive Vg. The modulation and demodulation circuit has extremely high anti-interference capability against radiated interference generated by the wireless power supply itself, and does not produce leakage inductance distortion problems caused by taking signals from transformers. Because the modulation and demodulation anti-interference capability of the technical solution of this invention is extremely strong, the wireless power supply winding T1, the reference and modulation frequency circuit winding T2, and the error signal feedback winding T3 can all be integrated on a cylindrical coaxial magnetic assembly to achieve rotation with the drilling platform. The magnetically integrated power output, error feedback, and switching frequency synchronization modulation and demodulation circuit of this invention solves the error feedback problem in the harsh physical and electromagnetic environment of downhole environments.

[0031] In summary, this invention provides a synchronization error signal feedback circuit for high-temperature wireless power supply. This circuit, by incorporating a PWM control circuit, a primary error signal adjustment circuit, a reference and modulation frequency circuit, an error modulation circuit, and a wireless coaxial magnetic component, achieves synchronization error signal feedback when using wireless power supply in high-temperature operating environments, exhibiting extremely strong modulation and demodulation anti-interference capabilities. Compared with existing technologies, the technical solution of this invention can solve the technical problem of inaccurate error feedback in harsh physical and electromagnetic environments downhole.

[0032] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A synchronization error signal feedback circuit for high-temperature wireless power supply, characterized in that, The high-temperature wireless power supply synchronization error signal feedback circuit includes: a PWM control circuit, a primary error signal conditioning circuit, a reference and modulation frequency circuit, an error modulation circuit, and a wireless coaxial magnetic component. The PWM control circuit, the primary error signal conditioning circuit, the reference and modulation frequency circuit, and the error modulation circuit respectively achieve contactless energy and signal transfer with the wireless coaxial magnetic component through windings. The PWM control circuit outputs a PWM signal based on the demodulated error signal. The reference and modulation frequency circuit outputs a secondary modulation frequency reference Vpwm and a secondary reference voltage Vsref based on the PWM signal. The error modulation circuit outputs a secondary error signal to the primary error signal conditioning circuit based on the secondary modulation frequency reference Vpwm and the secondary reference voltage Vsref. The primary error signal conditioning circuit outputs the demodulated error signal to the PWM control circuit based on the secondary error signal. The PWM control circuit includes a resistor R1, a diode D1, a capacitor C1, a PWM chip IC1, and a capacitor C2. The capacitor C1 is connected to the wireless power supply Vcc and the wireless coaxial magnetic component. The resistor R1 is connected to the wireless power supply Vcc and the negative terminal of the diode D1, and the positive terminal of the diode D1 is connected to the wireless coaxial magnetic component. The PWM chip IC1 is connected to the capacitor C1 to provide operating voltage for the PWM chip IC1. The PWM chip IC1 outputs a PWM signal Vg based on the demodulated error signal Verr. The capacitor C2 is connected to both the PWM chip IC1 and the wireless coaxial magnetic component. The PWM chip IC1 is a six-pin PWM chip. Pin 2 of the PWM chip IC1 receives the demodulated error signal Verr, pin 6 outputs the PWM signal Vg, pin 7 inputs the wireless power supply Vcc, and pin 5 is grounded. The wireless coaxial magnetic component includes winding T1 and winding T2. Winding T1 is a wireless power supply winding, and winding T2 is a reverse winding with the same terminal. Capacitor C2 is connected to the first input terminal of winding T2 to provide a PWM waveform for winding T2. The first output terminal of winding T2 is grounded, and winding T2 outputs a switching waveform according to the PWM waveform.

2. The synchronization error signal feedback circuit for high-temperature wireless power supply according to claim 1, characterized in that, The reference and modulation frequency circuit includes a PWM signal rectifier circuit and a filter circuit. The PWM signal rectifier circuit is connected to the winding T2 to obtain the secondary modulation frequency reference Vpwm. The filter circuit is connected in parallel with the PWM signal rectifier circuit and filters the secondary modulation frequency reference Vpwm to obtain the secondary reference voltage Vsref.

3. The synchronization error signal feedback circuit for high-temperature wireless power supply according to claim 2, characterized in that, The PWM signal rectifier circuit includes: capacitor C3, diode D5, diode D2, resistor R4, MOSFET Q1, and capacitor C4. Capacitor C3 is connected to the second output terminal of winding T2. The cathode of diode D5 is connected to capacitor C3, the anode of diode D2, and the gate of MOSFET Q1. Resistor R4 is connected to the cathode of diode D2 and the source of MOSFET Q1. Capacitor C4 is connected to the source of MOSFET Q1. The second input terminal of winding T2, the anode of diode D5, the drain of MOSFET Q1, and capacitor C4 are grounded. The secondary modulation frequency reference Vpwm is output between resistor R4 and capacitor C4.

4. The synchronization error signal feedback circuit for high-temperature wireless power supply according to claim 3, characterized in that, The filter circuit includes a diode D3 and a capacitor C5. The positive terminal of the diode D3 is connected to the source of the MOSFET Q1, and the negative terminal of the diode D3 is connected to the capacitor C5. The capacitor C5 is grounded, and the secondary reference voltage Vsref is output between the negative terminal of the diode D3 and the capacitor C5.

5. The synchronization error signal feedback circuit for high-temperature wireless power supply according to any one of claims 1 to 4, characterized in that, The wireless coaxial magnetic assembly also includes a winding T3, which is a winding with the same name and direction. The error modulation circuit includes a feedback circuit, a MOSFET Q2, and a capacitor C9. The feedback circuit acquires the first output voltage Vout1 and compares it with the secondary reference voltage Vsref to output a secondary error level to the winding T3. One end of the capacitor C9 is input to the secondary modulation frequency reference Vpwm, and the other end is connected to the gate of the MOSFET Q2. The source of the MOSFET Q2 is connected to the winding T3, and the drain of the MOSFET Q2 is grounded.

6. The synchronization error signal feedback circuit for high-temperature wireless power supply according to claim 5, characterized in that, The primary error signal conditioning circuit includes a diode D6, a capacitor C7, and a protection circuit. The positive terminal of the diode D6 is connected to the second input terminal of the winding T3, and the negative terminal of the diode D6 is connected to the capacitor C7. The protection circuit is connected in parallel with the capacitor C7. The demodulated error signal Verr is output between the negative terminal of the diode D6 and the capacitor C7. The capacitor C7 and the second output terminal of the winding T3 are both grounded.

7. The synchronization error signal feedback circuit for high-temperature wireless power supply according to claim 6, characterized in that, The protection circuit includes: a resistor R8, a MOSFET Q3, and a capacitor C8. The resistor R8 is connected to the cathode of the diode D6 and the source of the MOSFET Q3. The gate of the MOSFET Q3 is connected to one end of the capacitor C8, and the other end of the capacitor C8 is connected to the PWM signal Vg. The drain of the MOSFET Q3 is grounded.

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