A DC voltage transformer

Abstract

The present invention discloses a DC voltage transformer, comprising: a resistor-capacitor voltage divider, a primary converter, and a secondary photoelectric conversion unit; the primary converter comprising a resistor-capacitor matching adjustment unit and a signal processing unit; the resistor-capacitor matching adjustment unit being configured to calculate the value ranges of an adjustable resistor and an adjustable capacitor based on stray capacitance parameters obtained by electric field simulation of the resistor-capacitor voltage divider when the resistor-capacitor matching relationship in the resistor-capacitor voltage divider is disrupted, and to adjust the adjustable resistor and the adjustable capacitor respectively; the signal processing unit being electrically connected to the resistor-capacitor matching adjustment unit and performing buffering, amplification, and low-pass filtering on a voltage signal passing through the resistor-capacitor matching adjustment unit, thereby converting the processed voltage signal into an optical signal, which is then transmitted to the secondary photoelectric conversion unit via an optical fiber. The present invention solves the technical problems in the prior art in that the stray capacitance of the resistor-capacitor voltage divider has a significant impact on frequency characteristics and that the analog signal transmission process is easily interfered with.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a direct current voltage transformer. Background Art

[0002] The most commonly used DC high voltage measuring devices currently include resistor-capacitor voltage dividers, primary converters, optical fiber transmission systems and merging units.

[0003] The RC voltage divider divides the primary voltage and outputs a lower voltage proportional to the measured DC high voltage at the low-voltage arm of the RC voltage divider. This voltage is processed by the primary converter such as low-pass filtering and converted into a digital signal before being transmitted remotely via optical fiber. In the merging unit on the secondary side, it is converted into an electrical signal through electro-optical conversion and enters the MCU for processing. For the measurement of DC medium and low voltages, the analog signal is transmitted directly through the cable after the primary converter low-pass filter, which makes the stray capacitance of the RC voltage divider have a greater impact on the frequency characteristics and the analog signal transmission process is easily interfered with.

[0004] Therefore, there is an urgent need for a DC voltage transformer that can avoid the significant influence of the stray capacitance of the RC voltage divider on the frequency characteristics and the easy interference of the analog signal transmission process. Summary of the Invention

[0005] The present invention provides a DC voltage transformer to solve the technical problems in the prior art that the stray capacitance of a resistor-capacitor voltage divider has a significant impact on frequency characteristics and the analog signal transmission process is easily disturbed.

[0006] To solve the above technical problems, an embodiment of the present invention provides a DC voltage transformer, comprising: a resistor-capacitor voltage divider, a primary converter, and a secondary photoelectric conversion unit; the high-voltage end of the resistor-capacitor voltage divider is connected to a DC high-voltage bus to be measured, the low-voltage end of the resistor-capacitor voltage divider is electrically connected to the primary converter, and the primary converter is connected to the secondary photoelectric conversion unit via an optical fiber;

[0007] The primary converter includes a resistance-capacitance matching adjustment unit and a signal processing unit;

[0008] The RC matching adjustment unit is connected in parallel with the low-voltage end of the RC voltage divider, and is used to calculate the value range of the adjustable resistor and the adjustable capacitor according to the stray capacitance parameters obtained by the RC voltage divider through electric field simulation when the RC matching relationship in the RC voltage divider is destroyed, and adjust the adjustable resistor and the adjustable capacitor respectively; wherein the RC matching adjustment unit includes an adjustable resistor and an adjustable capacitor;

[0009] The signal processing unit is electrically connected to the RC matching adjustment unit, and performs buffer amplification and low-pass filtering on the voltage signal passing through the RC matching adjustment unit, thereby converting the processed voltage signal into an optical signal, and then sending the optical signal to the secondary photoelectric conversion unit through the optical fiber.

[0010] As a preferred solution, the value ranges of the adjustable resistor and the adjustable capacitor are calculated based on the stray capacitance parameters obtained by the electric field simulation of the resistor-capacitor voltage divider, and the adjustable resistor and the adjustable capacitor are adjusted respectively, specifically as follows:

[0011] Calculating the total equivalent resistance and total equivalent capacitance required by the RC voltage divider based on the stray capacitance parameters of the RC voltage divider obtained through electric field simulation;

[0012] Calculating the value ranges of the adjustable resistance and the adjustable capacitance respectively according to the total equivalent resistance and total equivalent capacitance required by the RC voltage divider;

[0013] When the RC voltage divider is connected to a DC voltage, the adjustable resistor is adjusted according to the value range of the adjustable resistor;

[0014] After the adjustment of the adjustable resistor is completed and when the RC voltage divider is connected to the harmonic voltage, the adjustable capacitor is adjusted according to the value range of the adjustable capacitor.

[0015] As a preferred solution, the signal processing unit includes a transient diode, a buffer filter subunit and a photoelectric conversion subunit;

[0016] The buffer filter subunit is connected in parallel with the resistance-capacitance matching adjustment unit, the transient diode is connected in parallel with the buffer filter subunit, and the output end of the buffer filter subunit is connected to the input end of the photoelectric conversion subunit.

[0017] As a preferred solution, the buffer filter subunit includes a buffer amplifier and a low-pass filter;

[0018] The buffer amplifier is used to buffer and amplify the voltage signal output by the resistance-capacitance matching adjustment unit;

[0019] The low-pass filter is used to filter out high-frequency noise from the buffered and amplified voltage signal.

[0020] As a preferred embodiment, a first photoelectric conversion tube is arranged between the primary converter and the secondary photoelectric conversion unit, the transmitting end of the first photoelectric conversion tube is arranged in the photoelectric conversion sub-unit of the primary converter, and the receiving end of the first photoelectric conversion tube is arranged in the secondary photoelectric conversion unit, and the transmitting end and the receiving end of the first photoelectric conversion tube are connected by an optical fiber.

[0021] As a preferred solution, the photoelectric conversion subunit further includes an arithmetic unit, a second photoelectric conversion tube, a voltage-to-current conversion module, and a current-to-voltage conversion module;

[0022] The first input end of the arithmetic unit is connected to the output end of the buffer filter subunit, the output end of the arithmetic unit is connected to the input end of the voltage-current conversion module, the output end of the voltage-current conversion module is connected to the emission end of the first photoelectric conversion tube, the emission end of the first photoelectric conversion tube is connected to the emission end of the second photoelectric conversion tube, the receiving end of the second photoelectric conversion tube is connected to the input end of the current-voltage conversion module, and the output end of the current-voltage conversion module is connected to the second input end of the arithmetic unit.

[0023] As a preferred solution, the operator is used to operate the processed voltage signal according to the feedback voltage signal to obtain the voltage signal to be sent;

[0024] The voltage-to-current conversion module is configured to convert the voltage signal to be sent into a current signal to obtain a current signal to be sent;

[0025] The transmitting end of the first photoelectric conversion tube is used to perform electro-optical conversion on the current signal to be transmitted to obtain a first optical signal to be transmitted, and transmit the first optical signal to be transmitted to the receiving end of the first photoelectric conversion tube through an optical fiber, and forward the current signal to be transmitted to the transmitting end of the second photoelectric conversion tube;

[0026] The transmitting end of the second photoelectric conversion tube performs electro-optical conversion on the current signal to be transmitted to obtain a second optical signal to be transmitted, and transmits the second optical signal to be transmitted to the receiving end of the second photoelectric conversion tube through an optical fiber;

[0027] The receiving end of the second photoelectric conversion tube is used to perform photoelectric conversion on the second optical signal to be transmitted, generate a feedback current signal, and send it to the current-voltage conversion module;

[0028] The current-voltage conversion module is used to convert the feedback current signal into a voltage signal, generate the feedback voltage signal, and send it to the operator.

[0029] As a preferred solution, the processed voltage signal is operated according to the feedback voltage signal to obtain the voltage signal to be sent, specifically:

[0030] According to the feedback voltage signal and the linearization principle of the preset nonlinear system, the processed voltage signal is subjected to feedback operation to obtain the voltage signal to be sent.

[0031] As a preferred solution, the secondary photoelectric conversion unit includes a receiving end of the first photoelectric conversion tube and an instrument;

[0032] The receiving end of the first photoelectric conversion tube is used to receive and convert the first optical signal to be transmitted into a current signal, and convert the current signal into a final voltage signal;

[0033] The instrument is used to receive the final voltage signal and visually display the final voltage signal.

[0034] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0035] The DC voltage transformer of the technical solution of the present invention uses a resistor-capacitor voltage divider, a primary converter, and a secondary photoelectric conversion unit. When the resistance-capacitance matching relationship in the resistor-capacitor voltage divider is destroyed, the adjustable resistor and the adjustable capacitor can be adjusted separately, thereby accurately calibrating the transformation ratio of the DC voltage transformer and satisfying the resistance-capacitance matching relationship of the resistor-capacitor voltage divider. This can greatly improve the frequency response of the DC voltage transformer, broaden the measurement frequency band, and reduce the influence of stray capacitance on the frequency characteristics. At the same time, through buffer amplification and low-pass filtering, the anti-interference performance of the DC voltage transformer is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 : A schematic structural diagram of a DC voltage transformer provided by an embodiment of the present invention;

[0037] Figure 2 : A schematic structural diagram of a buffer filter subunit provided in an embodiment of the present invention;

[0038] Figure 3 : A schematic structural diagram of the connection between the photoelectric conversion subunit and the secondary photoelectric conversion unit provided by an embodiment of the present invention;

[0039] The accompanying drawings in the specification are numerals as follows:

[0040] RC voltage divider 01, primary converter 02, RC matching adjustment unit 021, signal processing unit 022, transient diode TVS, buffer filter subunit 221, photoelectric conversion subunit 222, buffer amplifier 211, low-pass filter 212, operator 201, voltage-to-current conversion module 202, current-to-voltage conversion module 203, first photoelectric conversion tube 101, second photoelectric conversion tube 102, secondary photoelectric conversion unit 03, instrument 031. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] Example 1

[0043] Please refer to Figure 1 , a DC voltage transformer provided in an embodiment of the present invention, includes: a resistor-capacitor voltage divider 01, a primary converter 02 and a secondary photoelectric conversion unit 03; the high-voltage end of the resistor-capacitor voltage divider 01 is connected to the DC high-voltage bus to be measured, the low-voltage end of the resistor-capacitor voltage divider 01 is electrically connected to the primary converter 02, and the primary converter 02 is connected to the secondary photoelectric conversion unit 03 via an optical fiber.

[0044] In this embodiment, the RC voltage divider 01 is a parallel type RC voltage divider 01. The high-voltage end of the RC voltage divider 01 is connected to the measured DC high-voltage bus HV. The low-voltage arm outputs a lower voltage proportional to the measured DC high voltage according to the transformation ratio. A gas discharge tube is connected in parallel to the low-voltage arm to provide energy discharge protection for overvoltages such as lightning strikes in the primary voltage.

[0045] In this embodiment, the high voltage end of the RC voltage divider 01 includes a high voltage end resistor and a high voltage end capacitor connected in parallel, and the low voltage arm of the RC voltage divider 01 includes a low voltage arm resistor, a low voltage arm capacitor and a gas discharge tube.

[0046] The primary converter 02 includes a resistance-capacitance matching adjustment unit 021 and a signal processing unit 022 .

[0047] The RC matching adjustment unit 021 is connected in parallel with the low-voltage end of the RC voltage divider 01, and is used to calculate the value range of the adjustable resistor and the adjustable capacitor based on the stray capacitance parameters obtained by the RC voltage divider 01 through electric field simulation when the RC matching relationship in the RC voltage divider 01 is destroyed, and adjust the adjustable resistor and the adjustable capacitor respectively; wherein the RC matching adjustment unit 021 includes an adjustable resistor and an adjustable capacitor.

[0048] As a preferred solution, the value ranges of the adjustable resistor and the adjustable capacitor are calculated based on the stray capacitance parameters obtained by the electric field simulation of the RC voltage divider 01, and the adjustable resistor and the adjustable capacitor are adjusted respectively, specifically as follows:

[0049] Based on the stray capacitance parameters of the RC voltage divider 01 obtained through electric field simulation, the total equivalent resistance and total equivalent capacitance required by the RC voltage divider 01 are calculated; based on the total equivalent resistance and total equivalent capacitance required by the RC voltage divider 01, the value ranges of the adjustable resistance and the adjustable capacitance are respectively calculated; when the RC voltage divider 01 is connected to a DC voltage, the adjustable resistance is adjusted according to the value range of the adjustable resistance; after the adjustment of the adjustable resistance is completed, and when the RC voltage divider 01 is connected to a harmonic voltage, the adjustable capacitance is adjusted according to the value range of the adjustable capacitance.

[0050] In this embodiment, the RC matching unit includes an adjustable resistor and an adjustable capacitor, which are connected in parallel and then in parallel with the low-voltage arm of the RC voltage divider 01. When the RC matching relationship of the RC voltage divider 01 is disrupted due to the presence of stray capacitance, the adjustable resistor and adjustable capacitor of the RC matching unit are adjusted to change the total equivalent resistance and total equivalent capacitance of the low-voltage arm of the RC voltage divider 01, thereby reestablishing the matching relationship.

[0051] Furthermore, the ranges of adjustable resistance and capacitance are calculated after obtaining the stray capacitance parameters of the RC voltage divider 01 through electric field simulation. In practice, the adjustable resistance in the RC matching unit is first adjusted under DC voltage to precisely calibrate the voltage divider ratio of the DC voltage transformer. The adjustable capacitance is then adjusted under harmonic voltage to ensure that the overall voltage divider maintains a RC matching relationship at different frequencies, thereby expanding the measurement bandwidth of the DC voltage transformer.

[0052] The signal processing unit 022 is electrically connected to the RC matching adjustment unit 021, and performs buffering, amplification, and low-pass filtering on the voltage signal passing through the RC matching adjustment unit 021, thereby converting the processed voltage signal into an optical signal, and then sending the optical signal to the secondary photoelectric conversion unit 03 through the optical fiber.

[0053] As a preferred solution, the signal processing unit 022 includes a transient diode, a buffer filter subunit 221 and a photoelectric conversion subunit 222; the buffer filter subunit 221 is connected in parallel with the resistor-capacitor matching adjustment unit 021, the transient diode is connected in parallel with the buffer filter subunit 221, and the output end of the buffer filter subunit 221 is connected to the input end of the photoelectric conversion subunit 222.

[0054] In this embodiment, the signal processing unit 022 includes a transient voltage suppressor (TVS), a buffer filter subunit 221, and a photoelectric conversion subunit 222. The transient voltage suppressor (TVS) has the characteristics of fast response time and low clamping voltage. When used in conjunction with the gas discharge tube of the low-voltage arm, it can not only discharge high-energy overvoltages but also provide clamping protection for the signal processing unit 022.

[0055] As a preferred solution, the buffer filter subunit 221 includes a buffer amplifier 211 and a low-pass filter 212; the buffer amplifier 211 is used to buffer and amplify the voltage signal output by the resistor-capacitor matching adjustment unit 021; the low-pass filter 212 is used to filter out high-frequency noise from the buffered and amplified voltage signal.

[0056] In this example, see Figure 2 Buffer filter subunit 221 includes a buffer amplifier 211 and a low-pass filter 212. Buffer amplifier 211 is an emitter follower circuit with high input resistance and low input capacitance, effectively reducing the impact of the signal processing circuit's input impedance on the resistor-capacitor matching relationship. Low-pass filter 212 filters out high-frequency noise from the signal, improving the signal-to-noise ratio of the measurement system.

[0057] As a preferred solution, a first photoelectric conversion tube 101 is provided between the primary converter 02 and the secondary photoelectric conversion unit 03. The transmitting end of the first photoelectric conversion tube 101 is provided in the photoelectric conversion subunit 222 of the primary converter 02, and the receiving end of the first photoelectric conversion tube 101 is provided in the secondary photoelectric conversion unit 03. The transmitting end and the receiving end of the first photoelectric conversion tube 101 are connected via an optical fiber.

[0058] As a preferred embodiment, the photoelectric conversion subunit 222 further includes an arithmetic unit 201, a second photoelectric conversion tube 102, a voltage-to-current conversion module 202, and a current-to-voltage conversion module 203; the first input end of the arithmetic unit 201 is connected to the output end of the buffer filter subunit 221, the output end of the arithmetic unit 201 is connected to the input end of the voltage-to-current conversion module 202, the output end of the voltage-to-current conversion module 202 is connected to the transmitting end of the first photoelectric conversion tube 101, the transmitting end of the first photoelectric conversion tube 101 is connected to the transmitting end of the second photoelectric conversion tube 102, the receiving end of the second photoelectric conversion tube 102 is connected to the input end of the current-to-voltage conversion module 203, and the output end of the current-to-voltage conversion module 203 is connected to the second input end of the arithmetic unit 201.

[0059] As a preferred solution, the operator 201 is used to operate the processed voltage signal according to the feedback voltage signal to obtain the voltage signal to be sent; the voltage-to-current conversion module 202 is used to convert the voltage signal to be sent into a current signal to obtain the current signal to be sent; the transmitting end of the first photoelectric conversion tube 101 is used to perform electro-optical conversion on the current signal to be sent to obtain a first optical signal to be sent, and send the first optical signal to be sent to the receiving end of the first photoelectric conversion tube 101 through an optical fiber, and forward the current signal to be sent to the second photoelectric conversion tube 101. 2; the transmitting end of the second photoelectric conversion tube 102 performs electro-optical conversion on the current signal to be transmitted to obtain a second optical signal to be transmitted, and sends the second optical signal to be transmitted to the receiving end of the second photoelectric conversion tube 102 through the optical fiber; the receiving end of the second photoelectric conversion tube 102 is used to perform photoelectric conversion on the second optical signal to be transmitted to generate a feedback current signal, and send it to the current-voltage conversion module; the current-voltage conversion module is used to perform voltage signal conversion on the feedback current signal to generate the feedback voltage signal, and send it to the operator 201.

[0060] In this example, see Figure 3 The photoelectric conversion subunit 222 includes an arithmetic unit 201, a first photoelectric conversion tube 101, a second photoelectric conversion tube 102, a voltage-to-current conversion module 202, and a current-to-voltage conversion module 203. The transmitting end of the first photoelectric conversion tube 101 is LED1, and the receiving end of the first photoelectric conversion tube 101 is PD1; the transmitting end of the second photoelectric conversion tube 102 is LED2, and the receiving end of the second photoelectric conversion tube 102 is PD2. The voltage signal U after low-pass filtering is in The operator 201 combines the feedback voltage signal U f , performs calculations to obtain a voltage signal to be sent, and then the voltage-current conversion module 202 converts it into a current signal to be sent. This current drives the two series-connected LEDs 1 and 2 to emit light. The light emitted by LED 1 is transmitted through an optical fiber to the receiving end of the first photoelectric conversion tube 101, which is PD1. The light emitted by the other LED 2 passes through an optical fiber of the same length and is also photoelectrically converted by PD2. The converted current signal is fed back to the current-voltage conversion module 203 to obtain a feedback voltage signal U f .

[0061] As a preferred solution, the processed voltage signal is operated according to the feedback voltage signal to obtain the voltage signal to be sent, specifically:

[0062] According to the feedback voltage signal and the linearization principle of the preset nonlinear system, the processed voltage signal is subjected to feedback operation to obtain the voltage signal to be sent.

[0063] In this embodiment, according to the feedback voltage signal U f , and the linearization principle of the preset nonlinear system, the processed voltage signal is subjected to linear feedback operation, which improves the nonlinearity in the electro-optical-photoelectric conversion of the analog signal, thereby enhancing the anti-interference performance of the DC voltage transformer, and at the same time ensures that the strong electric ground on the primary side does not affect the weak electric ground on the secondary side.

[0064] As a preferred embodiment, the secondary photoelectric conversion unit 03 includes a receiving end of the first photoelectric conversion tube 101 and an instrument 031; the receiving end of the first photoelectric conversion tube 101 is used to receive and convert the first optical signal to be transmitted into a current signal, and convert the current signal into a final voltage signal; the instrument 031 is used to receive the final voltage signal and visually display the final voltage signal.

[0065] It is understood that this embodiment adds a RC matching unit between the RC voltage divider 01 and the primary converter 02, and an analog signal photoelectric conversion unit between the primary converter 02 and the secondary instrument 031, using optical fiber to transmit the analog signal. Both components are located within the primary converter 02. The RC matching unit is used to address the frequency response issues caused by stray capacitance in the RC voltage divider 01. The analog signal photoelectric conversion unit linearly converts the analog signal into an optical signal for transmission via optical fiber, addressing interference issues during signal transmission.

[0066] The implementation of the above embodiment has the following effects:

[0067] The DC voltage transformer of the technical solution of the present invention uses a resistor-capacitor voltage divider, a primary converter, and a secondary photoelectric conversion unit. When the resistance-capacitance matching relationship in the resistor-capacitor voltage divider is destroyed, the adjustable resistor and the adjustable capacitor can be adjusted separately, thereby accurately calibrating the transformation ratio of the DC voltage transformer and satisfying the resistance-capacitance matching relationship of the resistor-capacitor voltage divider. This can greatly improve the frequency response of the DC voltage transformer, broaden the measurement frequency band, and reduce the influence of stray capacitance on the frequency characteristics. At the same time, through buffer amplification and low-pass filtering, the anti-interference performance of the DC voltage transformer is enhanced.

[0068] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A DC voltage transformer, characterized in that: include: A resistor-capacitor voltage divider, a primary converter, and a secondary photoelectric conversion unit; the high-voltage end of the resistor-capacitor voltage divider is connected to the DC high-voltage bus to be measured, the low-voltage end of the resistor-capacitor voltage divider is electrically connected to the primary converter, and the primary converter is connected to the secondary photoelectric conversion unit via an optical fiber; The primary converter includes a resistance-capacitance matching adjustment unit and a signal processing unit; The RC matching adjustment unit is connected in parallel with the low-voltage end of the RC voltage divider, and is used to calculate the value range of the adjustable resistor and the adjustable capacitor according to the stray capacitance parameters obtained by the RC voltage divider through electric field simulation when the RC matching relationship in the RC voltage divider is destroyed, and adjust the adjustable resistor and the adjustable capacitor respectively; wherein the RC matching adjustment unit includes an adjustable resistor and an adjustable capacitor; The signal processing unit is electrically connected to the RC matching adjustment unit, and performs buffer amplification and low-pass filtering on the voltage signal passing through the RC matching adjustment unit, thereby converting the processed voltage signal into an optical signal, and then sending the optical signal to the secondary photoelectric conversion unit through the optical fiber.

2. A DC voltage transformer according to claim 1, characterized in that: The stray capacitance parameters obtained by the electric field simulation of the resistor-capacitor voltage divider are used to calculate the value ranges of the adjustable resistor and the adjustable capacitor, and the adjustable resistor and the adjustable capacitor are adjusted respectively, specifically as follows: Calculating the total equivalent resistance and total equivalent capacitance required by the RC voltage divider based on the stray capacitance parameters of the RC voltage divider obtained through electric field simulation; Calculating the value ranges of the adjustable resistance and the adjustable capacitance respectively according to the total equivalent resistance and total equivalent capacitance required by the RC voltage divider; When the RC voltage divider is connected to a DC voltage, the adjustable resistor is adjusted according to the value range of the adjustable resistor; After the adjustment of the adjustable resistor is completed and when the RC voltage divider is connected to the harmonic voltage, the adjustable capacitor is adjusted according to the value range of the adjustable capacitor.

3. A DC voltage transformer according to claim 1, characterized in that: The signal processing unit includes a transient diode, a buffer filter subunit and a photoelectric conversion subunit; The buffer filter subunit is connected in parallel with the resistance-capacitance matching adjustment unit, the transient diode is connected in parallel with the buffer filter subunit, and the output end of the buffer filter subunit is connected to the input end of the photoelectric conversion subunit.

4. A DC voltage transformer according to claim 3, characterized in that: The buffer filter subunit includes a buffer amplifier and a low-pass filter; The buffer amplifier is used to buffer and amplify the voltage signal output by the resistance-capacitance matching adjustment unit; The low-pass filter is used to filter out high-frequency noise from the buffered and amplified voltage signal.

5. A DC voltage transformer according to claim 3, characterized in that: A first photoelectric conversion tube is arranged between the primary converter and the secondary photoelectric conversion unit. The transmitting end of the first photoelectric conversion tube is arranged in the photoelectric conversion sub-unit of the primary converter, and the receiving end of the first photoelectric conversion tube is arranged in the secondary photoelectric conversion unit. The transmitting end and the receiving end of the first photoelectric conversion tube are connected by an optical fiber.

6. A DC voltage transformer according to claim 5, characterized in that: The photoelectric conversion subunit also includes an arithmetic unit, a second photoelectric conversion tube, a voltage-to-current conversion module, and a current-to-voltage conversion module; The first input end of the arithmetic unit is connected to the output end of the buffer filter subunit, the output end of the arithmetic unit is connected to the input end of the voltage-current conversion module, the output end of the voltage-current conversion module is connected to the emission end of the first photoelectric conversion tube, the emission end of the first photoelectric conversion tube is connected to the emission end of the second photoelectric conversion tube, the receiving end of the second photoelectric conversion tube is connected to the input end of the current-voltage conversion module, and the output end of the current-voltage conversion module is connected to the second input end of the arithmetic unit.

7. A DC voltage transformer according to claim 6, characterized in that: The operator is configured to operate the processed voltage signal according to the feedback voltage signal to obtain the voltage signal to be sent; The voltage-to-current conversion module is configured to convert the voltage signal to be sent into a current signal to obtain a current signal to be sent; The transmitting end of the first photoelectric conversion tube is used to perform electro-optical conversion on the current signal to be transmitted to obtain a first optical signal to be transmitted, and transmit the first optical signal to be transmitted to the receiving end of the first photoelectric conversion tube through an optical fiber, and forward the current signal to be transmitted to the transmitting end of the second photoelectric conversion tube; The transmitting end of the second photoelectric conversion tube performs electro-optical conversion on the current signal to be transmitted to obtain a second optical signal to be transmitted, and transmits the second optical signal to be transmitted to the receiving end of the second photoelectric conversion tube through an optical fiber; The receiving end of the second photoelectric conversion tube is used to perform photoelectric conversion on the second optical signal to be transmitted, generate a feedback current signal, and send it to the current-voltage conversion module; The current-voltage conversion module is used to convert the feedback current signal into a voltage signal, generate the feedback voltage signal, and send it to the operator.

8. A DC voltage transformer according to claim 7, characterized in that: The processed voltage signal is operated according to the feedback voltage signal to obtain the voltage signal to be sent, specifically: According to the feedback voltage signal and the linearization principle of the preset nonlinear system, the processed voltage signal is subjected to feedback operation to obtain the voltage signal to be sent.

9. A DC voltage transformer according to claim 5, characterized in that: The secondary photoelectric conversion unit includes a receiving end of the first photoelectric conversion tube and a meter; The receiving end of the first photoelectric conversion tube is used to receive and convert the first optical signal to be transmitted into a current signal, and convert the current signal into a final voltage signal; The instrument is used to receive the final voltage signal and visually display the final voltage signal.

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