10kV high-voltage isolating circuit

Abstract

The invention provides a 10kV high-voltage isolation circuit, which solves the problem that a control circuit is easily influenced by external output high voltage and the like, and comprises a high-voltage-withstanding transformer, the high-voltage-withstanding transformer is connected with a power supply isolation circuit through a rectifier bridge circuit, and the power supply isolation circuit is connected with a signal isolation circuit through a high-voltage module. The signal isolation circuit is connected with the control circuit, the signal isolation circuit adopts a digital isolator of an ADUM263 model, and the power supply isolation circuit adopts an isolation power supply of a URH2405P-6WR3 model. The device has the advantages of good isolation effect, stable operation and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit control, and in particular relates to a 10kV high-voltage isolation circuit. Background Art

[0002] A high-voltage isolation circuit is a circuit used to isolate the high-voltage part from the low-voltage part in an electrical system. Its main function is to prevent electrical interference and fault current on the high-voltage side from damaging the low-voltage side equipment, while also ensuring personnel safety and preventing users from coming into contact with high voltage and being electrocuted. For example, in a substation in a power system, a high-voltage isolation circuit can isolate the high-voltage transmission line from the control and monitoring equipment of the substation. In a high-voltage, low-current generator, when controlled by a single-chip microcomputer or other main control chip, current injection is prone to occur, affecting the control circuit or other circuits; in existing isolation schemes, the use of optoelectronic converter chips, wireless charging coils and other schemes has the disadvantages of large size, high cost, low voltage resistance, low energy transmission efficiency, and poor practicality and reliability, which is not conducive to engineering applications.

[0003] In order to solve the shortcomings of the existing technology, people have conducted long-term exploration and proposed various solutions. For example, a Chinese patent document discloses a high-voltage isolation protection circuit [201010260931.7], which includes a power supply unit, a leakage detection unit, a comparison unit and an isolation output unit: the positive and negative input ends of the leakage detection unit are respectively connected to the winding and the housing of the working motor, and the two output ends are connected to the comparison unit; the isolation output unit includes a photoelectric coupler, the input end of the photoelectric coupler is connected to the output end of the comparison unit, and the output end of the photoelectric coupler is connected to the control device; the power supply unit is used to provide power to the comparison unit and the isolation output unit; the comparison unit is used to detect the input end resistance of the leakage detection unit, if the input end resistance is lower than the set value, transmit a fault signal to the isolation output unit; the isolation output unit starts the control device to protect the working motor.

[0004] The above solution solves the problem of high-voltage circuit isolation protection to a certain extent, but the solution still has many shortcomings, such as the control circuit being affected by the external output high voltage. Summary of the invention

[0005] The purpose of the present invention is to provide a 10kV high voltage isolation circuit with reasonable design and good isolation effect in view of the above problems.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a 10kV high-voltage isolation circuit, including a high-voltage transformer, the high-voltage transformer is connected to a power isolation circuit through a rectifier bridge circuit, the power isolation circuit is connected to a signal isolation circuit through a high-voltage module, the signal isolation circuit is connected to a control circuit, the signal isolation circuit adopts an ADUM263 model digital isolator, and the power isolation circuit adopts an URH2405P-6WR3 model isolated power supply.

[0007] In the above-mentioned 10kV high-voltage isolation circuit, the high-voltage transformer is wound with a high-voltage cable and is connected to an over-temperature protection circuit R105.

[0008] In the above-mentioned 10kV high-voltage isolation circuit, the high-voltage module includes a DC converter U21 of model 20A12-P4-I5-1, and the DC converter U21 is connected to capacitors C45 and C46 grounded in parallel; the high-voltage module is equipped with a seat P7; the high-voltage module is connected to light-emitting diodes D10 and D11, and the light-emitting diode D10 is connected to a resistor R91, and the light-emitting diode D11 is connected to a resistor R92; the high-voltage module is equipped with signal relays K1 and K2 of model HFD4 / 5-S_C425975, and the signal relay K1 is connected to a diode D9 and connected to resistors R59 and R63 through a transistor Q2, and the signal relay K2 is connected to a diode D12 and connected to resistors R19 and R26 through a transistor Q3.

[0009] In the above-mentioned 10kV high-voltage isolation circuit, the high-voltage module includes a current detection amplifier U20 of the INA180A1 IDBVR model, and the current detection amplifier U20 is connected to the analog-to-digital converter U22 of the ADS8866IDGS model through the operational amplifier U19 of the OPA197IDR model; the analog-to-digital converter U22 is connected to the digital isolator U27 of the ADUM263N0BRIZ-RL model; the current detection amplifier U20 is connected to a resistor R62 and grounded capacitors C42 and C44, and a resistor R61 is connected between the current detection amplifier U20 and the operational amplifier U19, and the operational amplifier The amplifier U19 is connected to a resistor R58 and is equipped with a capacitor C43. A resistor R5 and a capacitor C74 and a resistor R90 connected in series to ground are connected between the operational amplifier U19 and the analog-to-digital converter U22. The analog-to-digital converter U22 is connected to an inductor FB7 through capacitors C72 and C73 connected in parallel. The analog-to-digital converter U22 is connected to a capacitor C79. Capacitors C80 and C87 and resistors R65, R68, R6, and R34 are connected between the analog-to-digital converter U22 and the digital isolator U27. The digital isolator U27 is connected to a capacitor C88.

[0010] In the above-mentioned 10kV high-voltage isolation circuit, the rectifier bridge circuit includes rectifier bridges D1 and D13 of the YBSM6010 model, the rectifier bridge D1 is connected to the seat P4 and the common-film choke L1 of the 744272222 model, and the rectifier bridge D13 is connected to the seat P6 and the common-film choke L2 of the 744272222 model; the inductor F1, the adjustable resistor R1 and the capacitors C1, C2, and C3 are connected between the rectifier bridge D1 and the common-film choke L1, and the common-film choke L1 is connected to the capacitors C4, C5, and C6; the inductor F2, the adjustable resistor R20 and the capacitors C97, C7, and C95 are connected between the rectifier bridge D13 and the common-film choke L2, and the common-film choke L2 is connected to the capacitors C98, C8, and C96.

[0011] In the above-mentioned 10kV high-voltage isolation circuit, the rectifier bridge circuit includes a power module U1 of URH2405P-6WR3 model and a power module U2 of URH2412LP-20WR3 model, the power module U1 is connected to capacitors C13, C14, C15, and C16, the power module U2 is connected to capacitors C9, C10, C11, and C12, the rectifier bridge circuit includes a power module U3 of URH2403P-6WR3 model and a power module U4 of URH2405P-6WR3 model, the power module U3 is connected to C57, C58, C59, and C60, the power module U4 is connected to capacitors C17, C33, C36, and C39, and the rectifier bridge circuit has a power module U8 of URH2405P-6WR3 model, and the power module U8 is connected to capacitors C61, C62, C99, and C100.

[0012] In the above-mentioned 10kV high-voltage isolation circuit, the rectifier bridge circuit has a low-voltage linear regulator U30 of model AMS1117-3.3, and the low-voltage linear regulator U30 is connected to capacitors C93 and C94; the rectifier bridge circuit has light-emitting diodes D2, D3, D5, and D6, the light-emitting diode D2 is connected to resistor R2, the light-emitting diode D3 is connected to resistor R10, the light-emitting diode D5 is connected to resistor R3, and the light-emitting diode D6 is connected to resistor R4.

[0013] In the above-mentioned 10kV high-voltage isolation circuit, the control circuit includes DAC60501MDGSR model digital-to-analog converters U14 and U17; the digital-to-analog converter U14 is connected to the operational amplifier U13 and the ADUM263N0BRIZ-RL model digital isolator U18; the digital-to-analog converter U17 is connected to the operational amplifier U16 and the ADUM263N0BRIZ-RL model digital isolator U25.

[0014] In the above-mentioned 10kV high-voltage isolation circuit, the digital-to-analog converter U14 is connected to a resistor R45, capacitors C68, C69 and an inductor FB4; the operational amplifier U13 is connected to resistors R40, R46 and is equipped with a capacitor C37, and a resistor R38 and a capacitor C38 are connected between the operational amplifier U13 and the digital-to-analog converter U14; the digital isolator U18 is connected to capacitors C70, C71, and resistors R41, R42, R44 are connected between the digital isolator U18 and the digital-to-analog converter U14.

[0015] In the above-mentioned 10kV high-voltage isolation circuit, the digital-to-analog converter U17 is connected to a resistor R56, capacitors C83, C84 and an inductor FB6; the operational amplifier U16 is connected to resistors R51, R57 and is equipped with a capacitor C40, and a resistor R49 and a capacitor C41 are connected between the operational amplifier U16 and the digital-to-analog converter U17; the digital isolator U25 is connected to capacitors C85, C86, and resistors R52, R53, R55 are connected between the digital isolator U25 and the digital-to-analog converter U17.

[0016] Compared with the existing technology, the advantages of the present invention are: the signal isolation circuit and the power isolation circuit cooperate to perform double isolation on the high-voltage module, thereby effectively protecting the safety of the input and output circuits; the use of a high-voltage transformer can ensure that the voltage at both ends can reach 10kV, and compared with the traditional switching circuit without a control chip, the output is more stable; the power supply and signal isolation used in the low-voltage part can meet most application requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 is a circuit diagram of a power isolation circuit of the present invention;

[0019] Figure 3 is a circuit diagram of a signal isolation circuit of the present invention;

[0020] Figure 4 is a circuit diagram of a high voltage module of the present invention;

[0021] Figure 5 is another circuit schematic diagram of the high voltage module of the present invention;

[0022] Figure 6 is a circuit diagram of a control circuit of the present invention;

[0023] Figure 7 is another circuit schematic diagram of the control circuit of the present invention;

[0024] Figure 8 is a circuit diagram of a rectifier bridge circuit of the present invention;

[0025] Fig. 9 It is another circuit schematic diagram of the rectifier bridge circuit of the present invention. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-9 As shown, a 10kV high-voltage isolation circuit includes a high-voltage transformer, the high-voltage transformer is connected to a power isolation circuit through a rectifier bridge circuit, the power isolation circuit is connected to a signal isolation circuit through a high-voltage module, the signal isolation circuit is connected to a control circuit, the signal isolation circuit uses an ADUM263 digital isolator, and the power isolation circuit uses an isolated power supply of URH2405P-6WR3. The digital isolator integrates fail-safe and robust 5.0kVrms six-channel digital isolation with three reverse channels, and the maximum communication rate can reach 150Mbps, meeting most single-bus or multi-bus communication protocols such as SPI and I2C. The three channels in the forward and direction directions can be used separately, mainly used to control the high-voltage module communication protocol to prevent the control circuit from being affected by the backflow of the high-voltage circuit, resulting in unstable data, etc. The maximum input of the isolated power supply can be 9-36V, and there are many output options, which can be adapted to a variety of scenarios.

[0028] Specifically, the high-voltage transformer is wound with a high-voltage cable and connected to an over-temperature protection circuit R105. A thicker insulation layer is applied to the high-voltage cable to prevent breakdown during circuit use. The over-temperature protection circuit R105 is added to disconnect the circuit when over-temperature occurs, effectively protecting the safety of the input and output circuits.

[0029] In depth, the high-voltage module includes a 20A12-P4-I5-1 model DC converter U21, which is connected to capacitors C45 and C46 connected to ground in parallel, for filtering and smoothing the voltage output by the DC converter, reducing voltage fluctuations and ripples, and thus making the output DC voltage more stable. The high-voltage module is equipped with a row seat P7, which is used to connect the interface of other circuit boards or external devices, and can also facilitate signal transmission; the high-voltage module is connected to light-emitting diodes D10 and D11 to indicate the working status of the high-voltage module, and the light-emitting diode D10 is connected to a resistor R91, and the light-emitting diode D11 is connected to a resistor R92. Resistors 91 and R92 mainly play a current limiting role to prevent excessive current flowing through the light-emitting diodes from damaging the light-emitting diodes. By properly selecting the resistance value of the resistor, the brightness of the light-emitting diode can be controlled; the high-voltage module is equipped with signal relays K1 and K2 of model HFD4 / 5-S_C425975. The signal relay K1 is connected to a diode D9 and connected to resistors R59 and R63 through transistor Q2. The signal relay K2 is connected to a diode D12 and connected to resistors R19 and R26 through transistor Q3. Diode D9 is used to protect the circuit to prevent the reverse electromotive force generated by the relay coil from damaging other components when the power is off. Transistor Q2 plays the role of amplifying current or controlling the on and off of the relay K1 coil. Resistors R59 and R63 are used to set the working state of transistor Q2 to determine the working point of transistor Q2. The principle of signal relay K2 is similar to that of K1. Diode D12 is used for protection, transistor Q3 is used to control the on and off of the relay K2 coil, and resistors R19 and R26 are used to set the working state of transistor Q3.

[0030] Furthermore, the high-voltage module includes a current detection amplifier U20 of the INA180A1 IDBVR model, which is connected to an analog-to-digital converter U22 of the ADS8866IDGS model through an operational amplifier U19 of the OPA197IDR model. The current detection amplifier U20 and the analog-to-digital converter U22 convert the current signal into a voltage signal, which is convenient for subsequent circuit processing; the analog-to-digital converter U22 is connected to a digital isolator U27 of the ADUM263N0BRIZ-RL model; the current detection amplifier U20 is connected to a resistor R62 and grounded capacitors C42 and C44 to remove high-frequency noise introduced during the current detection process to improve the quality of the signal. A resistor R61 is connected between the current detection amplifier U20 and the operational amplifier U19 to adjust the signal amplitude, isolation, etc., to ensure that the signal output from the current detection amplifier U20 can be properly input into the operational amplifier U19. The operational amplifier U19 is connected to a resistor R58 to set the gain of the operational amplifier 19, and is equipped with a capacitor C43 for phase compensation and stabilizing the working state of the operational amplifier U19. A resistor R5 and a capacitor C74 and a resistor R90 connected in series with the ground are connected between the operational amplifier U19 and the analog-to-digital converter U22 to form a low-pass filter, which filters out high-frequency signals and only allows low-frequency signals to pass, ensuring that the signal input to the analog-to-digital converter meets its requirements. The analog-to-digital converter U22 is connected to an inductor FB7 through capacitors C72 and C73 in parallel to form a power filter network for stabilizing the power supply of the analog-to-digital converter and reducing the interference of power supply noise on the conversion process. The analog-to-digital converter U22 is connected to a capacitor C79 for filtering or signal coupling. The capacitors C80 and C87 and resistors R65, R68, R6, and R34 are connected between the analog-to-digital converter U22 and the digital isolator U27 for filtering, isolation, or impedance matching during signal transmission, ensuring that the digital signal can be accurately transmitted from the analog-to-digital converter U22 to the digital isolator U27. The digital isolator U27 is mainly used to isolate different circuit parts during the digital signal transmission process to prevent electrical interference from propagating between circuits. It is connected to a capacitor C88 for signal filtering and stabilizing the operation of the digital isolator U27 itself.

[0031] Furthermore, the rectifier bridge circuit includes rectifier bridges D1 and D13 of the YBSM6010 model, which convert AC power input into DC power output to provide DC power for subsequent circuits. The rectifier bridge D1 is connected to a row seat P4 and a common film choke L1 of the 744272222 model, and the rectifier bridge D13 is connected to a row seat P6 and a common film choke L2 of the 744272222 model. The common film choke L1 and the common film choke L2 suppress interference signals of equal magnitude and the same direction that appear on two lines at the same time, thereby reducing the impact of electromagnetic interference on the circuit; the rectifier bridge D1 and the common film choke L1 are connected with an inductor F1, an adjustable resistor R1, and capacitors C1, C2, and C3, which constitute a filter circuit to filter out the AC component in the rectified pulsating DC and make the output DC smoother. By adjusting the resistance value of the adjustable resistor R1, the equivalent resistance of the circuit can be changed, thereby affecting the current size or voltage distribution. Capacitors C1, C2, C3 cooperate with inductor F1 to form different types of filter circuits, enhance the filtering effect, reduce the voltage ripple coefficient, and make the output DC voltage more stable. The common film choke L1 is connected to capacitors C4, C5, and C6; the inductor F2, adjustable resistor R20, and capacitors C97, C7, and C95 are connected between the rectifier bridge D13 and the common film choke L2. The common film choke L2 is connected to capacitors C98, C8, and C96 for further filtering, and cooperates with the common film choke L2 to ensure the quality of the DC signal after passing through the rectifier bridge D13.

[0032] In addition, the rectifier bridge circuit includes a URH2405P-6WR3 power module U1 and a URH2412LP-20WR3 power module U2. The power module U1 is connected to capacitors C13, C14, C15, and C16 for filtering. The power module U2 is connected to capacitors C9, C10, C11, and C12 for filtering. The rectifier bridge circuit includes a URH2403P-6WR3 power module U3 and a URH2405P-6WR3 power module U4. The power module U3 is connected to C57, C58, C59, and C60, the power module U4 is connected to capacitors C17, C33, C36, and C39, the rectifier bridge circuit has a power module U8 of model URH2405P-6WR3, and the power module U8 is connected to capacitors C61, C62, C99, and C100 to process the voltage output by the power module U8, so that the output DC voltage is smoother, the voltage ripple and high-frequency interference are reduced, and high-quality DC power is provided for subsequent parts in the rectifier bridge circuit or other connected circuits.

[0033] At the same time, the rectifier bridge circuit has a low-voltage linear regulator U30 of model AMS1117-3.3, and the output voltage of U30 is usually 3.3V. The low-voltage linear regulator U30 is connected with filter capacitors C93 and C94 to reduce the ripple and noise of the input voltage and ensure the relative stability of the input voltage; the rectifier bridge circuit has light-emitting diodes D2, D3, D5, and D6, the light-emitting diode D2 is connected with a resistor R2, the light-emitting diode D3 is connected with a resistor R10, the light-emitting diode D5 is connected with a resistor R3, and the light-emitting diode D6 is connected with a resistor R4. The light-emitting diodes D2, D3, D5, and D6 indicate the working status of the rectifier bridge circuit.

[0034] It can be seen that the control circuit includes DAC60501MDGSR model digital-to-analog converters U14 and U17, which receive digital signal inputs and then convert them into corresponding analog signal outputs; the digital-to-analog converter U14 is connected to an operational amplifier U13 and a digital isolator U18 of ADUM263N0BRIZ-RL model, which is used to connect the digital-to-analog converter U14 and other digital circuit parts to protect the digital-to-analog converter U14 or other related circuits from electrical interference and ensure the accuracy and stability of signal transmission; the digital-to-analog converter U17 is connected to an operational amplifier U16 and a digital isolator U25 of ADUM263N0BRIZ-RL model. Through the above connection method, the entire control circuit can more effectively convert digital signals into suitable analog signals, and transmit and process signals while isolating interference.

[0035] Obviously, the digital-to-analog converter U14 is connected with resistor R45, capacitors C68, C69 and inductor FB4, which constitute a low-pass filter for filtering out high-frequency noise in the output signal of the digital-to-analog converter, so that the output analog signal is smoother and the ripple is reduced to meet the signal quality requirements of subsequent circuits; the operational amplifier U13 is connected with resistors R40, R46 and is equipped with capacitor C37, and resistor R38 and capacitor C38 are connected between the operational amplifier U13 and the digital-to-analog converter U14. Resistor R38 and capacitor C38 are between the digital-to-analog converter U14 and the operational amplifier U13, and are used for signal buffering or filtering. Resistor R38 is used as an isolation resistor to prevent mutual influence between the front and rear circuits; capacitor C38 and resistor R38 together form a simple filter circuit to further filter out the noise in the signal transmission process, making the signal input to the operational amplifier U13 purer; digital isolator U18 is connected to capacitors C70 and C71, and resistors R41, R42, and R44 are connected between digital isolator U18 and digital-to-analog converter U14. Appropriate impedance matching can reduce signal reflection and improve the efficiency and accuracy of signal transmission; resistors R41, R42, and R44 can prevent the input current of digital isolator U18 from being too large and protect digital isolator U18 from damage.

[0036] Preferably, the digital-to-analog converter U17 is connected to a resistor R56, capacitors C83, C84 and an inductor FB6; the operational amplifier U16 is connected to resistors R51, R57 and is equipped with a capacitor C40, and a resistor R49 and a capacitor C41 are connected between the operational amplifier U16 and the digital-to-analog converter U17; the digital isolator U25 is connected to capacitors C85, C86, and resistors R52, R53, R55 are connected between the digital isolator U25 and the digital-to-analog converter U17.

[0037] To sum up, the principle of this embodiment is to use a high-voltage transformer, a rectifier bridge circuit, a power isolation circuit, a signal isolation circuit, a control circuit, and a high-voltage module, wherein the high-voltage power supply and the high-voltage signal can be fully isolated, which can solve the problems of large size, high cost, low voltage resistance, and low energy transmission of the current use of optoelectronic isolators and wireless charging.

[0038] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0039] Although this article uses more terms such as high-voltage transformer, rectifier bridge circuit, power isolation circuit, signal isolation circuit, control circuit, high-voltage module, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A 10kV high-voltage isolation circuit, comprising a high-voltage transformer, wherein the high-voltage transformer is connected to a power isolation circuit via a rectifier bridge circuit, wherein the power isolation circuit is connected to a signal isolation circuit via a high-voltage module, wherein the signal isolation circuit is connected to a control circuit, wherein: The signal isolation circuit adopts the digital isolator of model ADUM263, and the power isolation circuit adopts the isolated power supply of model URH2405P-6WR3.

2. A 10kV high voltage isolation circuit according to claim 1, characterized in that: The high-voltage transformer is wound with a high-voltage cable and is connected to an over-temperature protection circuit R105.

3. A 10kV high voltage isolation circuit according to claim 1, characterized in that: The high-voltage module includes a DC converter U21 of model 20A12-P4-I5-1, and the DC converter U21 is connected to capacitors C45 and C46 grounded in parallel; the high-voltage module is equipped with a seat P7; the high-voltage module is connected to light-emitting diodes D10 and D11, and the light-emitting diode D10 is connected to a resistor R91, and the light-emitting diode D11 is connected to a resistor R92; the high-voltage module is equipped with signal relays K1 and K2 of model HFD4 / 5-S_C425975, and the signal relay K1 is connected to a diode D9 and connected to resistors R59 and R63 through a transistor Q2, and the signal relay K2 is connected to a diode D12 and connected to resistors R19 and R26 through a transistor Q3.

4. A 10kV high voltage isolation circuit according to claim 1, characterized in that: The high-voltage module includes a current detection amplifier U20 of the INA180A1 IDBVR model, and the current detection amplifier U20 is connected to the analog-to-digital converter U22 of the ADS8866IDGS model through the operational amplifier U19 of the OPA197IDR model; the analog-to-digital converter U22 is connected to the digital isolator U27 of the ADUM263N0BRIZ-RL model; the current detection amplifier U20 is connected to a resistor R62 and grounded capacitors C42 and C44, a resistor R61 is connected between the current detection amplifier U20 and the operational amplifier U19, and the operational amplifier The amplifier U19 is connected to a resistor R58 and is equipped with a capacitor C43. A resistor R5 and a capacitor C74 and a resistor R90 connected in series to ground are connected between the operational amplifier U19 and the analog-to-digital converter U22. The analog-to-digital converter U22 is connected to an inductor FB7 via capacitors C72 and C73 connected in parallel. The analog-to-digital converter U22 is connected to a capacitor C79. Capacitors C80 and C87 and resistors R65, R68, R6 and R34 are connected between the analog-to-digital converter U22 and the digital isolator U27. The digital isolator U27 is connected to a capacitor C88.

5. A 10kV high voltage isolation circuit according to claim 1, characterized in that: The rectifier bridge circuit includes rectifier bridges D1 and D13 of model YBSM6010. The rectifier bridge D1 is connected to a seat P4 and a common-film choke L1 of model 744272222. The rectifier bridge D13 is connected to a seat P6 and a common-film choke L2 of model 744272222. An inductor F1, an adjustable resistor R1, and capacitors C1, C2, and C3 are connected between the rectifier bridge D1 and the common-film choke L1. The common-film choke L1 is connected to capacitors C4, C5, and C6. An inductor F2, an adjustable resistor R20, and capacitors C97, C7, and C95 are connected between the rectifier bridge D13 and the common-film choke L2. The common-film choke L2 is connected to capacitors C98, C8, and C96.

6. A 10kV high voltage isolation circuit according to claim 1, characterized in that: The rectifier bridge circuit includes a power module U1 of URH2405P-6WR3 model and a power module U2 of URH2412LP-20WR3 model. The power module U1 is connected to capacitors C13, C14, C15, and C16. The power module U2 is connected to capacitors C9, C10, C11, and C12. The rectifier bridge circuit includes a power module U3 of URH2403P-6WR3 model and a power module U4 of URH2405P-6WR3 model. The power module U3 is connected to C57, C58, C59, and C60. The power module U4 is connected to capacitors C17, C33, C36, and C39. The rectifier bridge circuit has a power module U8 of URH2405P-6WR3 model. The power module U8 is connected to capacitors C61, C62, C99, and C100.

7. A 10kV high voltage isolation circuit according to claim 1, characterized in that: The rectifier bridge circuit has a low-voltage linear regulator U30 of model AMS1117-3.3, and the low-voltage linear regulator U30 is connected to capacitors C93 and C94; the rectifier bridge circuit has light-emitting diodes D2, D3, D5, and D6, and the light-emitting diode D2 is connected to a resistor R2, the light-emitting diode D3 is connected to a resistor R10, the light-emitting diode D5 is connected to a resistor R3, and the light-emitting diode D6 is connected to a resistor R4.

8. A 10kV high voltage isolation circuit according to claim 1, characterized in that: The control circuit includes DAC60501MDGSR model digital-to-analog converters U14 and U17; the digital-to-analog converter U14 is connected to an operational amplifier U13 and a digital isolator U18 of ADUM263N0BRIZ-RL model; the digital-to-analog converter U17 is connected to an operational amplifier U16 and a digital isolator U25 of ADUM263N0BRIZ-RL model.

9. A 10kV high voltage isolation circuit according to claim 8, characterized in that: The digital-to-analog converter U14 is connected to a resistor R45, capacitors C68, C69 and an inductor FB4; the operational amplifier U13 is connected to resistors R40, R46 and is equipped with a capacitor C37, and a resistor R38 and a capacitor C38 are connected between the operational amplifier U13 and the digital-to-analog converter U14; the digital isolator U18 is connected to capacitors C70, C71, and resistors R41, R42, R44 are connected between the digital isolator U18 and the digital-to-analog converter U14.

10. A 10kV high voltage isolation circuit according to claim 8, characterized in that: The digital-to-analog converter U17 is connected to a resistor R56, capacitors C83, C84 and an inductor FB6; the operational amplifier U16 is connected to resistors R51, R57 and is equipped with a capacitor C40, and a resistor R49 and a capacitor C41 are connected between the operational amplifier U16 and the digital-to-analog converter U17; the digital isolator U25 is connected to capacitors C85, C86, and resistors R52, R53, R55 are connected between the digital isolator U25 and the digital-to-analog converter U17.

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