High-voltage intensity insulation isolation type voltage sensor based on wireless energy transfer technology

Abstract

The invention belongs to the technical field of sensors, and particularly relates to a high-voltage insulation isolation type voltage sensor based on a wireless energy transmission technology, which comprises a wireless energy transmission isolation power supply module, a multi-stage voltage stabilizing unit, a high-voltage dividing unit, a signal conditioning circuit and an ADC and optical fiber digital transmission circuit, the wireless energy transmission module realizes insulation power supply within an isolation distance of 5mm-500mm through electromagnetic resonance, and outputs direct current voltage; the multi-stage voltage stabilizing unit generates multiple paths of power supplies of 5V, 3.3 V and-15V; the high voltage dividing unit reduces 0-15kV high voltage into 0-10V signals according to 500: 1; the signal conditioning circuit outputs a high-precision analog signal through scaling of an instrument amplifier and second-order low-pass filtering; and the ADC and optical fiber transmission circuit digitizes the signal and converts the signal into an optical signal for transmission. According to the invention, the problems of large size, high cost and weak anti-electromagnetic interference capability of a traditional high-voltage insulation isolation type voltage sensor can be solved.

Description

Technical Field

[0001] This invention belongs to the field of sensor technology, and particularly relates to a high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission technology. Background Technology

[0002] In the fields of power electronics and high voltage technology, voltage monitoring of key nodes in medium and high voltage power equipment is a core component in ensuring the safe and stable operation of the system. In high voltage monitoring scenarios, the bus voltage detection circuit needs to establish a direct electrical connection with the high-voltage end being measured, while the signal processing, data display, and control unit are usually at ground potential (low-voltage side). To avoid electrical impact from the high-voltage side to the low-voltage side and to ensure the safety of equipment and personnel, reliable electrical isolation must be achieved between the high and low voltage sides, while also ensuring the accuracy and real-time nature of the monitoring data.

[0003] Currently, the isolation schemes of traditional high-voltage bus voltage monitoring circuits mainly rely on two types of core components: linear optocouplers or isolation transformers. However, both have significant technical defects and cannot meet the comprehensive requirements of isolation performance, size, cost, and monitoring accuracy in high-voltage scenarios. Among them, the linear optocoupler scheme has a simple structure and low cost, but it has inherent defects such as linearity being greatly affected by temperature and limited voltage range. Although the isolation transformer has high isolation withstand voltage, it requires the use of thick insulation materials and specific iron core structures to ensure insulation performance, resulting in large size and weight of the device, which is difficult to adapt to the development trend of miniaturization and integration of high-voltage equipment.

[0004] Meanwhile, traditional solutions also face challenges in data transmission: some systems use infrared transmission to achieve data isolation between high and low voltage sides, but infrared transmission has stringent requirements for optical path alignment accuracy and is easily affected by environmental dust, vibration and other factors, leading to transmission interruption; other solutions use wireless radio frequency transmission, but strong electromagnetic interference exists in high voltage scenarios, which will seriously disrupt wireless signals, causing data packet loss and delay, making it difficult to balance real-time performance and stability; at the same time, the wireless transmission module requires additional power supply, further increasing the complexity and power consumption of the high voltage side power supply.

[0005] Therefore, as power electronic equipment develops towards higher voltage, higher power density, and higher reliability, the shortcomings of existing isolation and transmission solutions are becoming increasingly prominent. There is an urgent need for a high voltage monitoring technology that combines high isolation voltage, low coupling capacitance, strong anti-electromagnetic interference capability, small size, and controllable cost. Summary of the Invention

[0006] The technical problem solved by this invention is to provide a high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission technology, so as to solve the problems of large size, high cost and weak anti-electromagnetic interference capability of traditional high-voltage, strong-insulation isolation voltage sensors.

[0007] The basic solution provided by this invention is a high-voltage, strongly insulated voltage sensor based on wireless power transmission technology. It includes a wireless power transmission isolated power supply module, a multi-stage voltage regulator unit, a high-voltage divider unit, a signal conditioning circuit, an ADC, and a fiber optic digital transmission circuit. The wireless power transmission isolated power supply module receives a DC power supply and outputs an adjustable DC voltage. The input of the multi-stage voltage regulator unit is connected to the output of the wireless power transmission isolated power supply module, and the output of the multi-stage voltage regulator unit is connected to each stage of the circuit components for power supply. The high-voltage divider unit receives the high-voltage signal to be monitored and outputs a sampled signal after being stepped down by a set ratio. The signal conditioning circuit receives the sampled signal output by the high-voltage divider unit and outputs a high-precision analog signal after signal conditioning. The ADC and fiber optic digital transmission circuit convert the high-precision analog signal into a digital signal and connects it to an external monitoring system. The wireless power transfer isolated power supply module includes a transmitter and a receiver, and energy is transferred between the transmitter and receiver through electromagnetic resonance. The transmitter includes a DC power supply. Choke inductor Improved resonant network and switching transistor at the transmitter DC power supply Choke inductor and switching transistor Improved resonant network for series and parallel transmitters.

[0008] Furthermore, the improved resonant network at the transmitter includes a capacitor. Equivalent inductance of transmitting coil Emitter resonant capacitor ,capacitance With switching transistor Parallel connection, equivalent inductance of the transmitting coil and the resonant capacitor at the transmitter With capacitor Series connection.

[0009] Furthermore, the equivalent inductance of the transmitting coil The value range is 0.1 -100 The transmitting end resonant capacitor The value range is 10pF-10nF.

[0010] Furthermore, the switching transistor S is either a GaN device or a SiC device.

[0011] Furthermore, the receiving end includes an equivalent inductance of a receiving coil. Receiver resonant capacitor CL network compensation circuit and receiving rectifier circuit, receiving coil equivalent inductance and the resonant capacitor at the receiving end The circuit constituting the receiving coil is connected in series with the CL network compensation circuit, which includes a CL network compensation inductor connected in series. and compensation capacitor ; The receiving rectifier circuit includes a full-bridge rectifier circuit and an output filter capacitor. The full-bridge rectifier circuit consists of diodes. , , , The circuit consists of a full-bridge rectifier circuit, with its input terminal connected to the receiving coil and its output terminal connected to the output filter capacitor. Connected.

[0012] Furthermore, the isolation distance between the receiver and the transmitter is 5mm-500mm; the output DC voltage of the wireless power transmission isolation power supply module is 1V-100V.

[0013] Furthermore, the multi-stage voltage regulator unit includes a buck switching regulator circuit, an LDO linear regulator circuit, and a negative voltage inverting circuit. The buck switching regulator circuit is used to reduce the 15V voltage to 5V; the LDO linear regulator circuit is used to linearly regulate the 5V voltage to 3.3V; and the negative voltage inverting circuit is used to convert the 5V voltage into a -15V voltage output.

[0014] Furthermore, the high-voltage divider unit is composed of n high-voltage precision voltage divider resistors connected in series. One end of the voltage divider resistor is electrically connected to the high-voltage input terminal, and the other end is grounded through a sampling resistor. The high-voltage input terminal has a voltage range of 0-15kV, the voltage division ratio of the voltage dividing resistor is 500:1, and the output voltage range is controlled to be 0-10V.

[0015] Furthermore, the signal conditioning circuit includes four high-speed operational amplifiers. , , , ;Depend on , , The instrumentation amplifier consists of a negative feedback network composed of resistors. , , , The composition, and the expression for calculating the gain G of the instrumentation amplifier are:

[0016] The instrumentation amplifier is used to scale the sampled signal from the high-voltage divider unit proportionally. Depend on Construct a second-order Sallen-Key low-pass filter, including resistors , and capacitor , The cutoff frequency of a second-order Sallen-Key low-pass filter The calculation expression is:

[0017] The high-frequency noise-removed output signal is obtained by using a second-order Sallen-Key low-pass filter.

[0018] Furthermore, the ADC and fiber optic digital transmission circuit includes an ADC module, an encoding module, a high-speed MOSFET driver, and a fiber optic transmitter. The ADC module acquires analog signals to generate ADC sampling data, and the encoding module combines the ADC sampling data and synchronization header information to encapsulate a digital signal. The high-speed MOSFET driver receives the digital signal and drives the fiber optic transmitter to convert the electrical signal into an optical signal for transmission to an external monitoring system.

[0019] The principle and advantages of this invention are as follows: This invention achieves high-precision monitoring of high voltage through a collaborative design of "wireless power transmission isolation power supply + fiber optic digital transmission". Its technical principle is as follows: The wireless power transmission isolation power supply module uses electromagnetic resonance as its core. In the transmitting end, the DC power supply passes through a choke inductor and a capacitor... Equivalent inductance of transmitting coil Emitter resonant capacitor The improved resonant network and GaN / SiC switching transistor convert DC energy into high-frequency AC energy. The receiving end uses the equivalent inductance of the receiving coil. Receiver resonant capacitor The CL network compensation circuit receives energy, which is then converted into an adjustable DC voltage of 1V-100V through full-bridge rectification and output filter capacitors. A multi-stage voltage regulator unit steps down, linearly regulates, and negatively regulates this voltage, converting it into multiple power supplies of 5V, 3.3V, and -15V to power subsequent circuits. A high-voltage divider unit uses n series-connected high-voltage precision resistors to step down the 0-15kV high voltage to a 0-10V sampling signal at a ratio of 500:1. In the signal conditioning circuit, an instrumentation amplifier composed of three operational amplifiers is set to a gain (determined by resistors). - (Determined) The sampled signal is scaled proportionally, and the second-order Sallen-Key low-pass filter (cutoff frequency determined by) is formed by the fourth operational amplifier. - , - (Identification) Removes high-frequency noise and outputs high-precision analog signals; the ADC and fiber optic digital transmission circuit convert the analog signals into digital signals, which are then encoded and packaged, and driven by a high-speed MOSFET driver to convert them into optical signals for transmission to an external monitoring system, achieving electrical isolation between high and low voltage sides throughout the process.

[0020] The advantages are: This invention effectively solves the shortcomings of traditional high-voltage monitoring schemes, and the technical effect is significant. Firstly, the wireless power transmission isolation power supply module does not require heavy insulating materials and iron cores. Combining the high-frequency and low-loss characteristics of GaN / SiC devices, it can achieve isolation distances of 5mm-500mm. Strong insulation and isolation, reducing the size by 40% compared to traditional isolation transformers. The above reduces costs by 30%. And coupling capacitor To avoid electrical impact from the high-voltage side to the low-voltage side; Secondly, the high-voltage divider unit employs a precision resistor series design, which, combined with the instrumentation amplifier in the signal conditioning circuit, precisely scales and filters the signal, reducing the noise amplitude of the analog signal. With the ADC module sampling, the monitoring error is controlled within... Within a certain range, the error is better than that of traditional linear optocoupler solutions. ; Third, fiber optic digital transmission inherently possesses strong resistance to electromagnetic interference and reduces transmission delay. This avoids the data packet loss problems caused by reliance on infrared transmission optical paths and susceptibility of wireless radio frequency transmission to strong electromagnetic field interference, ensuring data real-time performance and stability. Fourth, the multi-stage voltage regulator unit provides multiple stable power supplies to adapt to the power supply requirements of different circuits and meet the application requirements of high reliability, miniaturization and integration of high-voltage power equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the voltage sensor circuit structure according to an embodiment of the present invention. Detailed Implementation

[0022] The following detailed description illustrates the specific implementation method: The basic implementation examples are as follows: Figure 1As shown: A high-voltage, strongly insulated voltage sensor based on wireless power transmission technology includes a wireless power transmission isolated power supply module, a multi-stage voltage regulator unit, a high-voltage divider unit, a signal conditioning circuit, an ADC, and a fiber optic digital transmission circuit. The wireless power transmission isolated power supply module receives a DC power supply and outputs an adjustable DC voltage. The input of the multi-stage voltage regulator unit is connected to the output of the wireless power transmission isolated power supply module, and the output of the multi-stage voltage regulator unit is connected to each stage of the circuit components for power supply. The high-voltage divider unit receives the high-voltage signal to be monitored and outputs a sampled signal after being stepped down by a set ratio. The signal conditioning circuit receives the sampled signal output by the high-voltage divider unit, and outputs a high-precision analog signal after signal conditioning. The ADC and fiber optic digital transmission circuit converts the high-precision analog signal into a digital signal and connects to an external monitoring system. The wireless power transfer isolated power supply module includes a transmitter and a receiver. Energy is transferred between the transmitter and receiver via electromagnetic resonance. The transmitter includes a DC power supply. Choke inductor Improved resonant network and switching transistor at the transmitter DC power supply Choke inductor and switching transistor A series-parallel improved resonant network for the transmitter is used, with the switching transistor S being either a GaN device or a SiC device; in this embodiment, a GaN device is selected. A choke inductor is also included. ; The improved resonant network at the transmitter includes capacitors. Equivalent inductance of transmitting coil Emitter resonant capacitor ,capacitance With switching transistor Parallel connection, equivalent inductance of the transmitting coil and the resonant capacitor at the transmitter With capacitor Series connection; equivalent inductance of the transmitting coil The value range is 0.1 -100 In this embodiment, the transmitting coil is made of high-frequency, low-resistance Litz wire, and the equivalent inductance of the transmitting coil is... The transmitting end resonant capacitor The value range is 10pF-10nF. In this embodiment, the transmitter resonant capacitor... ;capacitance .

[0023] The receiving end includes the equivalent inductance of the receiving coil. Receiver resonant capacitor CL network compensation circuit and receiving rectifier circuit, receiving coil equivalent inductance and the resonant capacitor at the receiving end The circuit constituting the receiving coil is connected in series with the CL network compensation circuit. The receiving coil is made of high-frequency, low-impedance Litz wire, and the equivalent inductance of the receiving coil is... Resonant capacitor at the receiving end The CL network compensation circuit includes a series-connected CL network compensation inductor. and compensation capacitor ;CL network compensation inductance Compensation capacitor ; The receiving rectifier circuit includes a full-bridge rectifier circuit and an output filter capacitor. The full-bridge rectifier circuit consists of diodes. , , , The circuit consists of a full-bridge rectifier circuit, with its input terminal connected to the receiving coil and its output terminal connected to the output filter capacitor. The receiver and transmitter are connected; at the same time, the isolation distance between the receiver and transmitter is 5mm-500mm; in this embodiment, the distance between them is 20mm; the output DC voltage of the wireless power transmission isolation power supply module is 1V-100V; in this embodiment, the output DC voltage is 15V.

[0024] The connection diagram of each electrical component in the aforementioned wireless power transmission isolation power supply module is shown below. Figure 1 As shown, the low-voltage side is where the wireless power transmission isolation power supply module is located. Figure 1 The transmitting board corresponds to the transmitting end, and the receiving board corresponds to the receiving end. According to its technical description, its advantages are: Firstly, GaN devices are selected for the switching transistor S, forming a synergistic optimization with the improved resonant network at the transmitter. The reason is that in the prior art, the high-frequency inverter circuit at the transmitter needs to reduce stress through a complex buffer circuit, resulting in an increase in size. This application combines GaN devices with the improved resonant network, which can achieve low-stress, high-frequency operation without additional buffer circuits. At the same time, the coil is wound with Litz wire to reduce high-frequency skin effect loss, forming a synergistic innovation of device-topology-process, reducing the size by 40% compared with the traditional solution.

[0025] Meanwhile, based on GaN devices, a CL network compensation is added to the receiver to broaden the load adaptation range through dynamic impedance matching. Compared with the prior art, which requires an auxiliary resonant capacitor to adjust the resonant Q value, this application realizes the function of an auxiliary resonant capacitor through the combination of device and compensation network.

[0026] The multi-stage voltage regulator unit includes a buck switching regulator circuit, an LDO linear regulator circuit, and a negative voltage inverting circuit. The buck switching regulator circuit is used to reduce the 15V voltage to 5V. In this embodiment, an R-785.0-0.5 switching regulator is selected. The LDO linear regulator circuit is used to linearly regulate the 5V voltage to 3.3V. In this embodiment, an AMS1117-3.3 LDO linear regulator circuit is selected. The negative voltage inverting circuit is used to convert the 5V voltage to a -15V voltage output. In this embodiment, the negative voltage inverting circuit is composed of a MAX766CSA+ and a 47... The energy storage inductor and Schottky diode form an inverting topology, with a 10Ω input. With 33 Parallel inductor filtering, with 22 inductors used at the output. 68 and 1 Type network, 1.6 The feedback resistor sets the output voltage.

[0027] The high-voltage divider unit consists of n high-voltage precision voltage divider resistors connected in series, forming a chain-type high-voltage plug-in resistor array. One end of each voltage divider resistor is electrically connected to the high-voltage input terminal, and the other end is grounded through a sampling resistor, forming a voltage divider network. The high-voltage input terminal voltage range is 0-15kV, and in this embodiment, the input voltage range is 0-5kV. The voltage division ratio of the voltage divider resistor is 500:1, controlling the output voltage range to be 0-10V.

[0028] The signal conditioning circuit consists of an amplitude scaling circuit and a filtering circuit. The amplitude scaling circuit uses an instrumentation amplifier or a differential amplifier; in this embodiment, an instrumentation amplifier is selected. The filtering circuit uses a first-order or multi-order active low-pass filter topology; in this embodiment, a second-order Sallen-Key low-pass filter is selected. Specifically: Includes four high-speed operational amplifiers , , , ;Depend on , , The instrumentation amplifier consists of a negative feedback network composed of resistors. , , , The composition, and the expression for calculating the gain G of the instrumentation amplifier are:

[0029] In this context, the instrumentation amplifier is used to proportionally scale the sampled signal from the high-voltage divider unit; in the above formula, , , In this embodiment, all values ​​are 10. , 50 If the gain G is 0.33, the sampled signal will be scaled proportionally to the 0-3.3V range.

[0030] Depend on Construct a second-order Sallen-Key low-pass filter, including resistors , and capacitor , The cutoff frequency of a second-order Sallen-Key low-pass filter The calculation expression is:

[0031] In this embodiment, a second-order Sallen-Key low-pass filter is used to obtain the output signal with high-frequency noise removed. It is 2.43 , It is 4.53 , 22 , 10 Then the cutoff frequency This yields an output signal with high-frequency noise removed.

[0032] The ADC and fiber optic digital transmission circuit includes an ADC module, an encoding module, a high-speed MOSFET driver, and a fiber optic transmitter. The ADC module and encoding module are built into the microcontroller, respectively. The ADC module acquires analog signals to generate ADC sampling data, which has a bit depth of 8-16 bits. This embodiment uses a 10-bit microcontroller. The encoding module combines the ADC sampling data and synchronization header information, encapsulating them into a digital signal. The high-speed MOSFET driver receives the digital signal and drives the fiber optic transmitter to convert the electrical signal into an optical signal for transmission to an external monitoring system. The LED of the fiber optic transmitter has a peak drive current of 1A and rise and fall times of no more than 5 nanometers. Therefore, the fiber optic transmitter module in this application uses the HFBR-1521Z, which can convert electrical signals into optical signals, achieving electro-optical isolation transmission with an electrical isolation capability greater than 25 kV and high electromagnetic interference resistance. To verify its high-precision transmission, an input voltage of 0-10V with an increment of 0.5V was simulated. The Pearson correlation coefficient r was used to verify the linear relationship between the voltage and the ADC value, calculated using the following formula:

[0033] in, , These represent the ADC value and the voltage value, respectively. , Representing the average value of the ADC and the average value of the voltage, respectively, we find that r is greater than 0.999, indicating a very strong linear correlation, which proves its high-precision transmission performance.

[0034] Therefore, the high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission of the present invention does not require traditional optocoupler isolation or isolation transformer components. It achieves the design requirements of strong electrical isolation, stable monitoring and low coupling capacitance for high-voltage monitoring circuits with a smaller size and lower cost. The data transmission mode of the ADC and the fiber optic digital transmission circuit realizes electro-optical isolation transmission, which meets the design requirements of high isolation voltage, resistance to strong electromagnetic interference and reliable transmission.

[0035] In summary, the high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission proposed in this invention achieves high isolation voltage, low coupling capacitance, and low electromagnetic interference by providing an air gap through the resonant wireless power transmission principle, thus providing stable isolated power supply for high-voltage monitoring circuits. At the same time, the ADC and fiber optic communication transmission have the advantages of high isolation voltage, strong resistance to electromagnetic interference, and reliable transmission, and have promotional application value in the field of power electronics.

[0036] The above are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission technology, characterized in that: The system includes a wireless power transmission isolated power supply module, a multi-stage voltage regulator unit, a high-voltage divider unit, a signal conditioning circuit, an ADC, and a fiber optic digital transmission circuit. The wireless power transmission isolated power supply module receives DC power and outputs an adjustable DC voltage. The input of the multi-stage voltage regulator unit is connected to the output of the wireless power transmission isolated power supply module, and the output of the multi-stage voltage regulator unit is connected to each stage of the circuit components for power supply. The high-voltage divider unit receives the high-voltage signal to be monitored and outputs a sampled signal after being stepped down by a set ratio. The signal conditioning circuit receives the sampled signal output from the high-voltage divider unit, conditions it, and outputs a high-precision analog signal. The ADC and fiber optic digital transmission circuit converts the high-precision analog signal into a digital signal, which is then connected to an external monitoring system. The wireless power transfer isolated power supply module includes a transmitter and a receiver, and energy is transferred between the transmitter and receiver through electromagnetic resonance. The transmitter includes a DC power supply. Choke inductor Improved resonant network and switching transistor at the transmitter DC power supply Choke inductor and switching transistor Improved resonant network for series and parallel transmitters.

2. The high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission technology according to claim 1, characterized in that: The improved resonant network at the transmitter includes a capacitor. Equivalent inductance of transmitting coil Emitter resonant capacitor ,capacitance With switching transistor Parallel connection, equivalent inductance of the transmitting coil and the resonant capacitor at the transmitter With capacitor Series connection.

3. The high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission technology according to claim 2, characterized in that: The equivalent inductance of the transmitting coil The value range is 0.1 -100 The transmitting end resonant capacitor The value range is 10pF-10nF.

4. The high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission technology according to claim 3, characterized in that: The switching transistor S is either a GaN device or a SiC device.

5. The high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission technology according to claim 4, characterized in that: The receiving end includes the equivalent inductance of the receiving coil. Receiver resonant capacitor CL network compensation circuit and receiving rectifier circuit, receiving coil equivalent inductance and the resonant capacitor at the receiving end The circuit constituting the receiving coil is connected in series with the CL network compensation circuit, which includes a CL network compensation inductor connected in series. and compensation capacitor ; The receiving rectifier circuit includes a full-bridge rectifier circuit and an output filter capacitor. The full-bridge rectifier circuit consists of diodes. , , , The circuit consists of a full-bridge rectifier circuit, with its input terminal connected to the receiving coil and its output terminal connected to the output filter capacitor. Connected.

6. The high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission technology according to claim 5, characterized in that: The isolation distance between the receiver and the transmitter is 5mm-500mm; the output DC voltage of the wireless power transmission isolation power supply module is 1V-100V.

7. The high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission technology according to claim 1, characterized in that: The multi-stage voltage regulator unit includes a buck switching regulator circuit, an LDO linear regulator circuit, and a negative voltage inverting circuit. The buck switching regulator circuit is used to reduce the 15V voltage to 5V; the LDO linear regulator circuit is used to linearly regulate the 5V voltage to 3.3V; and the negative voltage inverting circuit is used to convert the 5V voltage into a -15V voltage output.

8. The high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission technology according to claim 1, characterized in that: The high-voltage divider unit consists of n high-voltage precision voltage divider resistors connected in series. One end of each voltage divider resistor is electrically connected to the high-voltage input terminal, and the other end is grounded through a sampling resistor. The high-voltage input terminal has a voltage range of 0-15kV, the voltage division ratio of the voltage dividing resistor is 500:1, and the output voltage range is controlled to be 0-10V.

9. The high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission technology according to claim 1, characterized in that: The signal conditioning circuit includes four high-speed operational amplifiers. , , , ;Depend on , , The instrumentation amplifier consists of a negative feedback network composed of resistors. , , , The composition, and the expression for calculating the gain G of the instrumentation amplifier are: The instrumentation amplifier is used to scale the sampled signal from the high-voltage divider unit proportionally. Depend on Construct a second-order Sallen-Key low-pass filter, including resistors , and capacitor , The cutoff frequency of a second-order Sallen-Key low-pass filter The calculation expression is: The high-frequency noise-removed output signal is obtained by using a second-order Sallen-Key low-pass filter.

10. The high-voltage, strong-insulation isolation voltage sensor based on wireless power transmission technology according to claim 1, characterized in that: The ADC and fiber optic digital transmission circuit includes an ADC module, an encoding module, a high-speed MOSFET driver, and a fiber optic transmitter. The ADC module acquires analog signals to generate ADC sampling data. The encoding module combines the ADC sampling data and synchronization header information and encapsulates them into digital signals. The high-speed MOSFET driver receives digital signals and drives the fiber optic transmitter to convert electrical signals into optical signals for transmission to an external monitoring system.

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