Ultrasonic wireless power supply and signal transmission circuit, high-voltage disconnector detection system and detection method

Abstract

The present invention discloses an ultrasonic wireless power supply and signal transmission circuit, a high-voltage disconnector detection system and a detection method. The circuit includes a DC power supply, a driving module, a transmitting transducer, a receiving transducer, an energy management and collection module, an encoding module, a signal acquisition and processing module, and a decoding module. The energy management and collection module includes an impedance change circuit, an impedance matching circuit, a first rectification circuit, an energy storage circuit, and a voltage stabilization circuit. The impedance change circuit generates an impedance change according to the PWM signal output by the encoding module. The encoding module encodes the image collected by the image acquisition unit into a PWM signal. The signal acquisition and processing module acquires a first electrical signal, processes and converts the first electrical signal to obtain a binary signal with image information. The decoding module decodes the binary signal to obtain a detection image. The present invention can directly detect the device state and improve the detection accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless power supply, and particularly relates to an ultrasonic wireless power supply and signal transmission circuit, a high-voltage disconnector detection system and a detection method. Background Art

[0002] With the growth of power demand and the development of the power industry, GIS (Gas Insulated Switchgear) meets the requirements of modern power systems and has been widely used. The high-voltage disconnector is crucial in GIS. Whether the high-voltage disconnector is properly closed or opened will affect the safety and stable operation of GIS and even the power grid. Therefore, it is necessary to effectively monitor the disconnector in order to perform maintenance in a timely manner and avoid greater losses. Since the disconnector in the GIS equipment is enclosed in a metal insulating cylinder using SF6 gas, it is impossible to directly observe whether the moving and static contacts of the disconnector are in place, which makes it a difficult problem to monitor the performance of the disconnector in the GIS equipment.

[0003] Currently, the technologies for monitoring the performance of the disconnector in GIS equipment include indirectly judging the state of the disconnector through the position indicator on the mechanism box, the closing and opening indicator lights in the control cabinet, or the position information of the background system. However, these methods have obvious defects. For example, the rupture of the drive shaft sleeve, the broken shaft caused by poor quality of the connecting rod material, and the inaccurate position of the in-place travel switch may cause problems such as incomplete closing and opening of the drive mechanism, insufficient opening distance between the moving and static contacts, and failure of position determination.

[0004] Currently, the industry generally indirectly judges the state of the high-voltage disconnector by monitoring indicators such as SF6 gas pressure, infrared imaging temperature measurement, and X-ray detection of the disconnector state. Some researchers also open a small window in the GIS to directly observe whether the high-voltage disconnector is properly closed or opened, but there are still certain deficiencies. Summary of the Invention

[0005] The purpose of the present invention is to provide an ultrasonic wireless power supply and signal transmission circuit, a high-voltage disconnector detection system and a detection method to solve the problem of inaccurate detection of traditional indirect detection methods.

[0006] The present invention solves the above technical problems through the following technical solutions: An ultrasonic wireless power supply and signal transmission circuit includes a DC power supply, a drive module, a transmitting transducer, a receiving transducer, an energy management and collection module, an encoding module, a signal acquisition and processing module, and a decoding module; the DC power supply, the drive module, and the transmitting transducer are connected in sequence, the receiving transducer, the energy management and collection module, and the encoding module are connected in sequence, and the signal acquisition and processing module is connected to the output end of the drive module and the decoding module;

[0007] The driving module is configured to perform inversion, boosting, and resonant matching processing on the output signal of the DC power supply to obtain a first electrical signal; the transmitting transducer is configured to convert the first electrical signal into an ultrasonic signal; the receiving transducer is configured to convert the ultrasonic signal into a second electrical signal;

[0008] The energy management and harvesting module includes an impedance change circuit, an impedance matching circuit, a first rectifier circuit, an energy storage circuit, and a voltage stabilization circuit. The impedance change circuit is connected to the receiving transducer, the impedance matching circuit, and the encoding module. The impedance matching circuit is connected to the receiving transducer and the first rectifier circuit. The first rectifier circuit is connected to the energy storage circuit and the voltage stabilization circuit; the voltage stabilization circuit is configured to provide stable electrical energy for the image acquisition unit and the encoding module; the impedance change circuit is configured to generate impedance changes according to the PWM signal output by the encoding module;

[0009] The encoding module is configured to encode the image acquired by the image acquisition unit into a PWM signal; the signal acquisition and processing module is configured to acquire the first electrical signal, process and convert the first electrical signal to obtain a binary signal with image information; the decoding module is configured to decode the binary signal to obtain a detected image.

[0010] Further, the driving module includes an inverter circuit, a boosting circuit, and a resonant matching network connected in sequence.

[0011] Further, the impedance change circuit includes a MOS transistor, a resistor R1, a resistor R2, and a diode D1; the gate of the MOS transistor is respectively connected to the first ends of the resistor R1 and the resistor R2. The drain of the MOS transistor is connected to the receiving transducer. The source of the MOS transistor is connected to the impedance matching circuit and grounded; the second end of the resistor R1 is grounded, the second end of the resistor R2 is connected to the cathode of the diode D1, and the anode of the diode D1 is connected to the encoding module.

[0012] Further, the energy management and harvesting module further includes a protection circuit, and the protection circuit is disposed between the first rectifier circuit and the voltage stabilization circuit.

[0013] Further, the signal acquisition and processing module includes a sampling resistor and a second rectifier circuit, a first filter circuit, an amplification circuit, an envelope detection circuit, a voltage comparator, and an analog-to-digital conversion circuit connected in sequence; the sampling resistor is connected to the output end of the driving module and the second rectifier circuit.

[0014] Further, the amplification circuit includes a first-stage amplifier, a second filter circuit, and a second-stage amplifier connected in sequence.

[0015] Further, the envelope detection circuit includes a diode D2, a capacitor C1, and a resistor R3; the anode of the diode D2 is connected to the output terminal of the amplifier circuit, the cathode is connected to one end of the capacitor C1 and the resistor R3, and the other ends of the capacitor C1 and the resistor R3 are grounded.

[0016] Based on the same concept, the present invention also provides a high-voltage disconnector detection system, including an image acquisition unit and the ultrasonic wireless power supply and signal transmission circuit as described above; the image acquisition unit is connected to the voltage stabilization circuit and the encoding module in the ultrasonic wireless power supply and signal transmission circuit, and is used to acquire the state image of the high-voltage disconnector;

[0017] The receiving transducer, the energy management and collection module, and the encoding module in the ultrasonic wireless power supply and signal transmission circuit are arranged inside the GIS cabinet, and the DC power supply, the driving module, the transmitting transducer, the signal acquisition and processing module, and the decoding module in the ultrasonic wireless power supply and signal transmission circuit are arranged outside the GIS cabinet.

[0018] Based on the same concept, the present invention also provides a high-voltage disconnector detection method, which is applied to the high-voltage disconnector detection system as described above. The detection method includes:

[0019] Obtain the state image of the high-voltage disconnector;

[0020] Encode the state image to obtain a PWM signal;

[0021] Generate an impedance change according to the PWM signal to change the amplitude of the first electrical signal;

[0022] Collect the first electrical signal, and process and convert the first electrical signal to obtain a binary signal with image information;

[0023] Decode the binary signal to obtain the detection image of the high-voltage disconnector.

[0024] Further, encoding the state image includes:

[0025] Perform grayscale processing on the state image to obtain a grayscale image;

[0026] Perform binarization processing on the grayscale image to obtain a binarized image;

[0027] Perform binary encoding and level conversion on the binarized image to obtain a PWM signal. Beneficial effects

[0028] Compared with the prior art, the advantages of the present invention are as follows:

[0029] The present invention uses ultrasonic wireless power supply to power the image acquisition unit, encodes the images acquired by the image acquisition unit into PWM signals, adjusts the impedance of the output terminal of the receiving transducer through the PWM signals, so that the amplitude of the output signal of the driving module changes accordingly, collects, processes and decodes the output signal of the driving module, and the corresponding image can be obtained, realizing the transmission of image information from the inside to the outside, realizing the direct detection of the equipment state, improving the detection accuracy of the equipment state, and solving the problem that GIS disconnectors cannot be directly detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only one embodiment of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 is the structural block diagram of the ultrasonic wireless power supply and signal transmission circuit in the embodiment of the present invention;

[0032] Figure 2 is the structural block diagram of the driving module in the embodiment of the present invention;

[0033] Figure 3 is the schematic diagram of the impedance change circuit in the embodiment of the present invention;

[0034] Figure 4 is the structural block diagram of the signal acquisition and processing module in the embodiment of the present invention;

[0035] Figure 5 is the waveform of the first electrical signal collected by the sampling resistor in the embodiment of the present invention;

[0036] Figure 6 is the high and low level signals output by the voltage comparator in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following will clearly and completely describe the technical solutions in the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0038] The following will detail the technical solutions of the present application with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0039] Embodiment 1

[0040] Figure 1 shows a structural block diagram of an ultrasonic wireless power supply and signal transmission circuit. As Figure 1 shown, the ultrasonic wireless power supply and signal transmission circuit includes a DC power supply, a driving module, a transmitting transducer, a receiving transducer, an energy management and collection module, an encoding module, a signal acquisition and processing module, and a decoding module; the DC power supply, the driving module, and the transmitting transducer are connected in sequence, the receiving transducer, the energy management and collection module, and the encoding module are connected in sequence, and the signal acquisition and processing module is connected to the output end of the driving module and the decoding module.

[0041] The DC power supply is used to supply electrical energy to the entire circuit. The driving module is used to perform inversion, boosting, and resonance matching processing on the output signal of the DC power supply to obtain a first electrical signal. The transmitting transducer is used to convert the first electrical signal into an ultrasonic signal. The receiving transducer is used to convert the ultrasonic signal penetrating the metal medium into a second electrical signal. The energy management and collection module is used to perform impedance matching, rectification, and voltage regulation on the second electrical signal to supply electrical energy to the image acquisition unit and the encoding module, and is used to generate impedance changes according to the PWM signal output by the encoding module, so that the amplitude of the first electrical signal changes accordingly. The energy management and collection module also stores energy using the rectified second electrical signal, and the stored electrical energy is used to supply electrical energy to the image acquisition unit and the encoding module when the impedance change is large and the second electrical signal is low and may not be able to supply power stably. The encoding module is used to encode the image collected by the image acquisition unit into a PWM signal. The signal acquisition and processing module is used to acquire the first electrical signal, and perform processing and conversion on the first electrical signal to obtain a binary signal with image information; the decoding module is used to decode the binary signal to obtain a detected image, realizing the transmission of image information from the inside to the outside.

[0042] In a specific embodiment of the present invention, as Figure 2 shown, the driving module includes an inversion circuit, a boosting circuit, and a resonance matching network connected in sequence. Since the transmitting transducer needs to work under an AC voltage, the inversion circuit inverses the DC voltage output by the DC power supply into an AC voltage, then the boosting circuit boosts the AC voltage to near the rated working voltage of the transmitting transducer, and then the resonance matching network adjusts the working frequency of the boosted signal to be consistent with the transmitting transducer to improve the energy conversion efficiency. In this embodiment, the boosting circuit is a transformer; the resonance matching network can be a series inductance resonance circuit, a parallel inductance resonance circuit, an LC series resonance circuit, or a CLC resonance circuit; the inversion circuit can be a half-bridge circuit or a full-bridge circuit.

[0043] The working principles of the transmitting transducer and the receiving transducer are based on the piezoelectric effect. When the piezoelectric crystal in the transmitting transducer is subjected to an electric field, a mechanical deformation that linearly varies with the electric field is generated on the surface, which is the inverse piezoelectric effect. The inverse piezoelectric effect can convert electrical energy (i.e., the first electrical signal) into mechanical energy, thereby generating vibrations and generating ultrasonic waves that match the voltage frequency. These ultrasonic waves can penetrate the metal medium and propagate inward, and are finally received by the receiving transducer. When the piezoelectric crystal in the receiving transducer is deformed under an external force, a charge accumulation that is linear with the external force appears on the surface of the piezoelectric crystal, which is the direct piezoelectric effect. Through the direct piezoelectric effect, mechanical energy is converted into electrical energy (i.e., the second electrical signal).

[0044] In a specific embodiment of the present invention, as Figure 1 shown, the energy management and harvesting module includes an impedance change circuit, an impedance matching circuit, a first rectifier circuit, an energy storage circuit, and a voltage stabilization circuit. The impedance change circuit is connected to the receiving transducer, the impedance matching circuit, and the encoding module. The impedance matching circuit is connected to the receiving transducer and the first rectifier circuit. The first rectifier circuit is connected to the energy storage circuit and the voltage stabilization circuit. The impedance matching circuit is used to supplement the reactive power of the second electrical signal obtained from the receiving transducer and improve the efficiency. The first rectifier circuit is used to convert the alternating current after passing through the impedance matching circuit into direct current that can meet the power supply requirements of the image acquisition unit and the encoding module, and charge the energy storage circuit. The voltage stabilization circuit is used to stabilize the rectified signal and provide stable electrical energy for the image acquisition unit and the encoding module. The impedance change circuit is used to generate an impedance change according to the PWM signal output by the encoding module. The energy storage circuit is used to store electrical energy and stably supply power to the image acquisition unit and the encoding module when the impedance change is large and the second electrical signal is low and may not be able to supply power stably.

[0045] In a specific embodiment of the present invention, the energy management and harvesting module further includes a protection circuit, and the protection circuit is arranged between the first rectifier circuit and the voltage stabilization circuit. The protection circuit is used for protection in case of overheating or short circuit. The voltage stabilization circuit can convert the direct current into a stable direct current voltage of 3 to 12V to meet the working voltage requirements of the image acquisition unit and the encoding module.

[0046] In this embodiment, the impedance matching circuit can adopt a series inductance mode or a parallel resistance mode.

[0047] In this embodiment, the image acquisition unit uses a low-power camera to capture the device status image and send the device status image to the encoding module. The encoding module can select a single-chip microcomputer, and the single-chip microcomputer encodes the device status image to generate a PWM signal. The specific process of the single-chip microcomputer encoding the device status image is as follows: perform grayscale processing on the status image to obtain a grayscale image; perform binarization processing on the grayscale image to obtain a binary image; perform binary encoding (i.e., black corresponds to 0 and white corresponds to 1) and level conversion (i.e., 1 corresponds to high level and 0 corresponds to low level) on the binary image to obtain a PWM signal.

[0048] In a specific embodiment of the present invention, as Figure 3 shown, the impedance change circuit includes an MOS transistor, a resistor R1, a resistor R2, and a diode D1; the gate of the MOS transistor is respectively connected to the first ends of the resistor R1 and the resistor R2, the drain of the MOS transistor is connected to the receiving transducer, and the source of the MOS transistor is connected to the impedance matching circuit and grounded; the second end of the resistor R1 is grounded, the second end of the resistor R2 is connected to the cathode of the diode D1, and the anode of the diode D1 is connected to the encoding module. The PWM signal is input to the gate of the MOS transistor through the diode D1 and the resistor R2. When the PWM signal outputs a high level, the MOS transistor is turned on. At this time, the on-resistance of the MOS transistor is very small, so that the total impedance of the receiving transducer and the energy management and collection module is reduced; when the PWM signal outputs a low level, the MOS transistor is turned off. At this time, the off-resistance of the MOS transistor is very large, so that the total impedance of the receiving transducer and the energy management and collection module is increased; as the total impedance of the receiving transducer and the energy management and collection module changes, the amplitude of the output signal (i.e., the first electrical signal) of the driving module changes accordingly, thereby realizing the transmission of image information from the inside to the outside.

[0049] In a specific embodiment of the present invention, as Figure 4 shown, the signal acquisition and processing module includes a sampling resistor and a second rectifier circuit, a first filter circuit, an amplifier circuit, an envelope detection circuit, a voltage comparator, and an analog-to-digital conversion circuit connected in sequence; the sampling resistor is connected to the output end of the driving module and the second rectifier circuit.

[0050] The voltage waveform (i.e., the first electrical signal) at the output end of the driving module is collected through the sampling resistor. Due to the on or off of the MOS transistor in the impedance change circuit, the amplitude of the first electrical signal shows high and low changes, as Figure 5 shown. The second rectifier circuit rectifies the collected first electrical signal, and then filters out interference such as noise through the first filter circuit to select an appropriate frequency range; since the first electrical signal is small, it needs to be amplified through the amplifier circuit to facilitate subsequent processing; the amplified signal passes through the envelope detection circuit and the voltage comparator and then outputs a voltage with obvious high and low levels, as Figure 6As shown; finally, it is converted into a binary signal with image information through an analog-to-digital conversion circuit.

[0051] In a specific embodiment of the present invention, the amplification circuit includes a first-stage amplifier, a second filtering circuit, and a second-stage amplifier connected in sequence. In this embodiment, the first filtering circuit is a low-pass filtering circuit, and the second filtering circuit is a high-pass filtering circuit.

[0052] In a specific embodiment of the present invention, the envelope detection circuit includes a diode D2, a capacitor C1, and a resistor R3; the anode of the diode D2 is connected to the output end of the amplification circuit, the cathode is connected to one end of the capacitor C1 and the resistor R3, and the other ends of the capacitor C1 and the resistor R3 are grounded. The envelope detection circuit is used to extract the signal envelope from the amplified signal. Since the signal envelope has high and low differences in different voltage bands, and the signal envelope is weak and there is attenuation, resulting in the high and low differences of the signal envelope not being obvious, it is necessary to process it through a voltage comparator. When the positive input (i.e., the signal envelope) of the voltage comparator is greater than its negative input, the voltage comparator outputs a high level; when the positive input (i.e., the signal envelope) of the voltage comparator is less than its negative input, the voltage comparator outputs a low level, thus better reproducing the high and low level information.

[0053] The decoding module decodes the binary signal, that is, 0 corresponds to black and 1 corresponds to white, maps to obtain a binary image, and further obtains a detection image.

[0054] The present invention can directly detect the device state, improve the detection accuracy, and solve the problem of inaccurate detection of traditional indirect detection methods.

[0055] Embodiment Two

[0056] The embodiment of the present invention further provides a high-voltage disconnector detection system, including an image acquisition unit and the ultrasonic wireless power supply and signal transmission circuit in Embodiment One of the present application; the image acquisition unit is connected to the voltage stabilization circuit and the encoding module in the ultrasonic wireless power supply and signal transmission circuit, and is used to acquire the state image of the high-voltage disconnector;

[0057] The receiving transducer, the energy management and collection module, and the encoding module in the ultrasonic wireless power supply and signal transmission circuit are arranged inside the GIS cabinet, and the DC power supply, the driving module, the transmitting transducer, the signal acquisition and processing module, and the decoding module in the ultrasonic wireless power supply and signal transmission circuit are arranged outside the GIS cabinet.

[0058] The state image of the high-voltage disconnector is directly collected by the image acquisition unit, and then the state image is encoded by the encoding module to generate a PWM signal. The impedance is adjusted through the PWM signal (that is, when the MOS transistor is turned on, the impedance decreases; when the MOS transistor is turned off, the impedance increases), so that the amplitude of the output signal of the driving module changes accordingly. Then, the signal acquisition and processing module collects the output signal of the driving module, processes and converts the output signal to obtain a binary signal with image information. Finally, the decoding module decodes the binary signal to obtain the detection image of the high-voltage disconnector, and the opening and closing state of the high-voltage disconnector can be directly known through the detection image, realizing the direct detection of the state of the high-voltage disconnector, improving the detection accuracy, and effectively solving the problem that the GIS disconnector cannot be directly monitored.

[0059] Embodiment III

[0060] The embodiment of the present invention also provides a method for detecting a high-voltage disconnector, which is applied to the high-voltage disconnector detection system in Embodiment II of the present application. The detection method includes:

[0061] Step 1: Obtain the state image of the high-voltage disconnector by using the image acquisition unit;

[0062] Step 2: Encode the state image by using the encoding module to obtain a PWM signal;

[0063] Step 3: The impedance change circuit generates an impedance change according to the PWM signal, so that the amplitude of the first electrical signal changes;

[0064] Step 4: The signal acquisition and processing module collects the first electrical signal, processes and converts the first electrical signal to obtain a binary signal with image information;

[0065] Step 5: The decoding module decodes the binary signal to obtain the detection image of the high-voltage disconnector.

[0066] In the specific embodiment of the present invention, encoding the state image by using the encoding module includes:

[0067] Step 2.1: Perform grayscale processing on the state image to obtain a grayscale image;

[0068] Step 2.2: Perform binarization processing on the grayscale image to obtain a binarized image;

[0069] Step 2.3: Perform binary encoding (that is, black corresponds to 0, and white corresponds to 1) and level conversion (that is, 0 corresponds to low level, and 1 corresponds to high level) on the binarized image to obtain a PWM signal.

[0070] The above-disclosed is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or variations, which should all be covered within the protection scope of the present invention.

Claims

1. An ultrasonic wireless power supply and signal transmission circuit, characterized in that: The circuit includes a DC power supply, a driving module, a transmitting transducer, a receiving transducer, an energy management and collection module, an encoding module, a signal acquisition and processing module, and a decoding module; the DC power supply, the driving module, and the transmitting transducer are connected in sequence, the receiving transducer, the energy management and collection module, and the encoding module are connected in sequence, and the signal acquisition and processing module is connected to the output end of the driving module and the decoding module; The driving module is used to perform inversion, boosting and resonance matching processing on the output signal of the DC power supply to obtain a first electrical signal; the transmitting transducer is used to convert the first electrical signal into an ultrasonic signal; the receiving transducer is used to convert the ultrasonic signal into a second electrical signal; The energy management and collection module includes an impedance change circuit, an impedance matching circuit, a first rectifier circuit, an energy storage circuit and a voltage stabilizing circuit. The impedance change circuit is connected to the receiving transducer, the impedance matching circuit and the encoding module. The impedance matching circuit is connected to the receiving transducer and the first rectifier circuit. The first rectifier circuit is connected to the energy storage circuit and the voltage stabilizing circuit. The voltage stabilizing circuit is used to provide stable electric energy for the image acquisition unit and the encoding module. The impedance change circuit is used to generate impedance changes according to the PWM signal output by the encoding module. The encoding module is used to encode the image acquired by the image acquisition unit into a PWM signal; the signal acquisition and processing module is used to acquire the first electrical signal, process and convert the first electrical signal, and obtain a binary signal with image information; The decoding module is used to decode the binary signal to obtain a detection image.

2. The ultrasonic wireless power supply and signal transmission circuit according to claim 1, characterized in that: The driving module comprises an inverter circuit, a boost circuit and a resonant matching network which are connected in sequence.

3. The ultrasonic wireless power supply and signal transmission circuit according to claim 1, characterized in that: The impedance variation circuit includes a MOS tube, a resistor R1, a resistor R2 and a diode D1; the gate of the MOS tube is respectively connected to the first ends of the resistor R1 and the resistor R2, the drain of the MOS tube is connected to the receiving transducer, and the source of the MOS tube is connected to the impedance matching circuit and grounded; the second end of the resistor R1 is grounded, the second end of the resistor R2 is connected to the cathode of the diode D1, and the anode of the diode D1 is connected to the encoding module.

4. The ultrasonic wireless power supply and signal transmission circuit according to claim 1, characterized in that: The energy management and collection module further includes a protection circuit, and the protection circuit is arranged between the first rectifier circuit and the voltage stabilizing circuit.

5. The ultrasonic wireless power supply and signal transmission circuit according to claim 1, characterized in that: The signal acquisition and processing module includes a sampling resistor and a second rectifier circuit, a first filter circuit, an amplifier circuit, an envelope detection circuit, a voltage comparator and an analog-to-digital conversion circuit connected in sequence; the sampling resistor is connected to the output end of the driving module and the second rectifier circuit.

6. The ultrasonic wireless power supply and signal transmission circuit according to claim 5, characterized in that: The amplifying circuit comprises a first-stage amplifier, a second filtering circuit and a second-stage amplifier which are connected in sequence.

7. The ultrasonic wireless power supply and signal transmission circuit according to claim 5, characterized in that: The envelope detection circuit includes a diode D2, a capacitor C1 and a resistor R3; the anode of the diode D2 is connected to the output end of the amplifier circuit, the cathode is connected to one end of the capacitor C1 and the resistor R3, and the other end of the capacitor C1 and the resistor R3 is grounded.

8. A high voltage disconnect switch detection system, characterized in that: The detection system comprises an image acquisition unit and an ultrasonic wireless power supply and signal transmission circuit as described in any one of claims 1 to 7; the image acquisition unit is connected to a voltage stabilizing circuit and an encoding module in the ultrasonic wireless power supply and signal transmission circuit, and is used to acquire a state image of the high-voltage disconnector; The receiving transducer, energy management and collection module and encoding module in the ultrasonic wireless power supply and signal transmission circuit are arranged inside the GIS cabinet, and the DC power supply, driving module, transmitting transducer, signal acquisition and processing module and decoding module in the ultrasonic wireless power supply and signal transmission circuit are arranged outside the GIS cabinet.

9. A high-voltage isolating switch detection method, applied to the high-voltage isolating switch detection system as claimed in claim 8, characterized in that: The detection method comprises: Get the status image of the high voltage disconnector; Encoding the state image to obtain a PWM signal; Producing impedance changes according to the PWM signal, so that the amplitude of the first electrical signal changes; Collecting a first electrical signal, and processing and converting the first electrical signal to obtain a binary signal having image information; The binary signal is decoded to obtain a detection image of the high-voltage disconnector.

10. The high-voltage disconnect switch detection method according to claim 9, characterized in that: Encoding the state image comprises: Performing grayscale processing on the state image to obtain a grayscale image; Binarizing the grayscale image to obtain a binary image; The binary image is binary-coded and level-converted to obtain a PWM signal.

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