A digital proportional regulation-based AC-DC induction voltage divider and a regulation method

Abstract

The application discloses a kind of AC / DC induction voltage divider based on digital proportional regulation and adjusting method, belong to voltage proportional conversion technical field.Voltage divider includes high voltage potential tracer, resistance voltage dividing network, digital proportional regulator and digital signal processor;High voltage potential tracer is used to receive the high voltage input signal to be handled and transmission to resistance voltage dividing network;Resistance voltage dividing network is used to carry out proportional voltage division to high voltage input signal and obtains voltage division voltage signal, and transmission to digital proportional regulator;Digital signal processor is used to obtain target setting ratio under the condition of monitoring system control instruction, according to target setting ratio and the voltage division ratio of resistance voltage dividing network, digital control quantity is calculated, transmission to digital proportional regulator;Digital proportional regulator is used to carry out two-stage proportional transformation to voltage division voltage signal based on digital control quantity, obtains analog voltage signal, by implementing the application, it can solve the problem that existing cannot compatible DC signal and wideband signal.

Description

Technical Field

[0001] This invention relates to the field of voltage proportional conversion technology, and in particular to an AC / DC inductive voltage divider and its adjustment method based on digital proportional regulation. Background Technology

[0002] Multi-disc inductive voltage dividers are classic high-precision proportional conversion devices in the field of voltage proportional conversion, and are widely used in power frequency voltage metering and calibration scenarios. With the large-scale integration of high-proportion new energy sources and high-proportion power electronic equipment into power systems, coupled with the widespread adoption of DC charging facilities for electric vehicles, the industry urgently needs high-precision voltage proportional sensing devices that can handle DC, power frequency, and broadband signals.

[0003] Existing multi-disc self-calibrating inductive voltage dividers rely on the principle of electromagnetic induction to achieve voltage proportional transformation. The output voltage is related to the signal frequency. The losses caused by the iron core and windings will affect the measurement of non-power frequency signals, while DC signals cannot be proportionally transformed through electromagnetic induction. Under broadband signals, iron core losses and winding parasitic parameters will introduce uncontrollable errors. Therefore, this type of equipment can only achieve precise proportional transmission of power frequency signals and cannot be compatible with DC signals and broadband signals. Summary of the Invention

[0004] This invention provides an AC / DC inductive voltage divider and adjustment method based on digital proportional adjustment, which can effectively solve the problem that the existing technology can only achieve precise proportional transmission of power frequency signals and cannot be compatible with DC signals and broadband signals.

[0005] An embodiment of the present invention provides an AC / DC inductive voltage divider based on digital proportional adjustment, comprising: a high-voltage potential tracker, a resistive voltage divider network, a digital proportional regulator, and a digital signal processor; the output terminal of the high-voltage potential tracker is connected to the input terminal of the resistive voltage divider network; the output terminal of the resistive voltage divider network is connected to a first terminal of the digital proportional regulator; and the second terminal of the digital proportional regulator is connected to the output terminal of the digital signal processor. The high-voltage potential tracker is used to receive the high-voltage input signal to be processed and transmit the high-voltage input signal to the resistor voltage divider network; The resistor voltage divider network is used to proportionally divide the high voltage input signal to obtain a divided voltage signal, and then transmit the divided voltage signal to the digital proportional regulator. The digital signal processor is used to obtain a target set ratio when a system control command is detected, calculate a digital control quantity based on the target set ratio and the voltage division ratio of the resistor voltage divider network, and transmit the digital control quantity to the digital proportional regulator. The digital proportional regulator is used to perform a two-stage proportional transformation on the voltage divider signal based on the digital control quantity to obtain an analog voltage signal.

[0006] Furthermore, it also includes a low-voltage potential tracker; the input terminal of the low-voltage potential tracker is connected to the output terminal of the resistor voltage divider network, and the output terminal of the low-voltage potential tracker is connected to the first terminal of the digital proportional regulator; The low-voltage potential tracker is used to perform impedance isolation and potential tracking on the voltage divider signal to obtain a processed voltage divider signal, and then transmits the processed voltage divider signal to the digital proportional regulator.

[0007] Furthermore, the resistor voltage divider network includes several resistors connected in series; each resistor has the same resistance value and is made of the same material.

[0008] Furthermore, the high-voltage potential tracker includes a high-voltage operational amplifier, a low-voltage operational amplifier, a first resistor, and a second resistor; the low-voltage operational amplifier, together with the first resistor and the second resistor, forms an offset compensation circuit. The high-voltage operational amplifier is used to perform potential following on the high-voltage input signal to be processed to obtain a high-voltage following signal, and to transmit the high-voltage following signal to the offset compensation circuit. The offset compensation circuit is used to perform offset voltage compensation and correction on the high voltage following signal to obtain a compensated high voltage input signal, and then transmit the compensated high voltage input signal to the resistor divider network.

[0009] Furthermore, the digital proportional controller includes a digital-to-analog converter, a zero-offset voltage precision operational amplifier, and several resistors; the zero-offset voltage precision operational amplifier and several resistors constitute a signal conversion and amplification circuit. The digital-to-analog converter is used to receive digital control signals, switch the internal electronic switch configuration based on the digital control signals, and convert the voltage divider signal into a weighted analog current signal based on the digital control signals. The signal conversion and amplification circuit is used to receive the weighted analog current signal, convert the weighted analog current signal and amplify it to obtain an analog voltage signal after two-stage proportional conversion.

[0010] Furthermore, the digital signal processor is used to calculate, based on the target set turns ratio and the voltage division ratio of the resistor divider network, a digital control quantity to be obtained, including: The second-stage voltage division ratio is calculated based on the target set ratio and the voltage division ratio of the resistor voltage divider network. The digital control quantity is calculated based on the second-order voltage ratio.

[0011] Furthermore, it also includes a display module; the display module is connected to the display interface of the digital signal processor; The display module is used to input and display the target set ratio.

[0012] Furthermore, it also includes a keyboard; the keyboard is connected to the I / O interface of the digital signal processor; The keyboard is used to input the target set ratio and system control commands.

[0013] As an improvement to the above solution, another embodiment of the present invention provides a method for adjusting an AC / DC inductive voltage divider based on digital proportional control. The method is applicable to the digital signal processor of the AC / DC inductive voltage divider. The AC / DC inductive voltage divider further includes a high-voltage potential tracker, a resistive voltage divider network, and a digital proportional controller. The output terminal of the high-voltage potential tracker is connected to the input terminal of the resistive voltage divider network. The output terminal of the resistive voltage divider network is connected to the first terminal of the digital proportional controller. The second terminal of the digital proportional controller is connected to the output terminal of the digital signal processor. The AC / DC inductive voltage divider adjustment method includes: Upon detecting system control commands, the target set ratio is obtained; The digital control quantity is obtained by calculating based on the target set ratio and the voltage division ratio of the resistor voltage divider network; The digital control quantity is transmitted to the digital proportional regulator, so that the digital proportional regulator performs a two-stage proportional transformation on the voltage divider signal based on the digital control quantity to obtain an analog voltage signal; Specifically, the high-voltage input signal to be processed is received by the high-voltage potential tracker and transmitted to the resistor voltage divider network; the high-voltage input signal is proportionally divided by the resistor voltage divider network to obtain a divided voltage signal, and the divided voltage signal is transmitted to the digital proportional regulator.

[0014] Furthermore, the AC / DC inductive voltage divider also includes a low-voltage potential tracker; the input terminal of the low-voltage potential tracker is connected to the output terminal of the resistive voltage divider network, and the output terminal of the low-voltage potential tracker is connected to the first terminal of the digital proportional regulator. The low-voltage potential tracker is used to perform impedance isolation and potential tracking on the voltage divider signal to obtain a processed voltage divider signal, and then transmits the processed voltage divider signal to the digital proportional regulator.

[0015] By implementing this invention, at least the following beneficial effects are achieved: This invention provides an AC / DC inductive voltage divider based on digital proportional adjustment, comprising a high-voltage potential tracker, a resistive voltage divider network, a digital proportional regulator, and a digital signal processor. The output of the high-voltage potential tracker is connected to the input of the resistive voltage divider network; the output of the resistive voltage divider network is connected to the first terminal of the digital proportional regulator; the second terminal of the digital proportional regulator is connected to the output of the digital signal processor. Voltage proportional attenuation is achieved through the resistive voltage divider network, and the voltage division ratio is determined by the resistance ratio of the resistors within the network. The resistance ratio is an inherent property of the device and is independent of the frequency of the input signal. Regardless of whether the input is DC, power frequency, or broadband AC signal, the voltage distribution relationship of the series resistors remains stable, eliminating frequency domain errors caused by core magnetic saturation, magnetic loss, and parasitic winding parameters, thus eliminating the frequency dependence defects caused by electromagnetic induction at the fundamental level. The high-voltage potential tracker completes high-voltage signal reception and impedance transformation, transmitting the measured high-voltage signal to the subsequent resistive voltage divider network without significant attenuation, ensuring that the preceding high-voltage signal can be completely transmitted to the resistive voltage divider network without signal distortion due to impedance mismatch. The resistor divider network outputs a divided voltage signal, which is then fed into a digital proportional controller. The digital signal processor (DSP) monitors system control commands, obtains the target set transformation ratio, and calculates the digital control quantity based on the division ratio of the resistor divider network. This digital control quantity is then sent to the digital proportional controller. The digital proportional controller performs a two-stage digital proportional conversion on the divided voltage signal based on the digital control quantity. The digital proportional controller relies on the resistor network of its internal digital-to-analog converter to achieve proportional adjustment. The ratio is determined by the internal resistor ratio of the chip and does not depend on electromagnetic induction effects. Throughout the signal path, there are no highly frequency-sensitive components such as iron cores or windings; the ratios of the first-stage voltage division and the second-stage proportional conversion are both determined by the resistor ratios. The resistor ratios do not change regardless of whether the signal is DC or AC at different frequencies. The operational amplifier's bandwidth can cover the DC to the target wideband range. Therefore, the AC / DC inductive voltage divider can simultaneously process DC signals, power frequency signals, and wideband signals, overcoming the inherent limitation of traditional multi-disc self-calibrating inductive voltage dividers, which can only operate at power frequency and cannot handle DC and wideband signals. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an AC / DC inductive voltage divider based on digital proportional adjustment, provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the principle of a low-voltage potential tracker provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the principle of a high-voltage potential tracker provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of a digital proportional controller provided in an embodiment of the present invention; Figure 5This is a schematic flowchart of an AC / DC inductive voltage divider adjustment method based on digital proportional control, provided by an embodiment of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] See Figure 1 To address the problem that existing technologies can only achieve precise proportional transmission of power frequency signals and cannot be compatible with DC signals and broadband signals, an embodiment of the present invention provides a schematic diagram of an AC / DC inductive voltage divider based on digital proportional adjustment, comprising: a high-voltage potential tracker U1, a resistive voltage divider network U2, a digital proportional regulator U3, and a digital signal processor U4; the output terminal of the high-voltage potential tracker is connected to the input terminal of the resistive voltage divider network; the output terminal of the resistive voltage divider network is connected to the first terminal of the digital proportional regulator; and the second terminal of the digital proportional regulator is connected to the output terminal of the digital signal processor. like Figure 1 As shown, the AC / DC inductive voltage divider also includes a low-voltage potential tracker U5, a display module U6, and a keyboard U7.

[0019] The high-voltage potential tracker is used to receive the high-voltage input signal to be processed and transmit the high-voltage input signal to the resistor voltage divider network; The resistor voltage divider network is used to proportionally divide the high voltage input signal to obtain a divided voltage signal, and then transmit the divided voltage signal to the digital proportional regulator. The digital signal processor is used to obtain a target set ratio when a system control command is detected, calculate a digital control quantity based on the target set ratio and the voltage division ratio of the resistor voltage divider network, and transmit the digital control quantity to the digital proportional regulator. The digital proportional regulator is used to perform a two-stage proportional transformation on the voltage divider signal based on the digital control quantity to obtain an analog voltage signal.

[0020] Specifically, a high-voltage potential tracker is used to track the input high-voltage signal and simultaneously increase the input impedance to reduce the load impact on the preceding measured signal. A resistor divider network represents a voltage divider circuit composed of multiple resistors connected in series, utilizing the voltage distribution principle of series resistors to achieve a fixed-ratio attenuation of the input voltage. A digital proportional regulator controls the equivalent ratio of its internal resistor network using digital signals to achieve continuously adjustable output voltage ratios. A digital signal processor (DSP) is an integrated circuit chip specifically designed for digital computation and peripheral control, responsible for receiving operation commands, performing proportional calculations, outputting control quantities, and driving peripheral devices.

[0021] Schematic, the high-voltage input signal to be processed is connected to the input terminal of the high-voltage potential tracker. After impedance transformation by the high-voltage potential tracker, it is output to the input terminal of the resistor voltage divider network. The resistor voltage divider network performs a fixed-ratio first-stage voltage division on the high-voltage signal to obtain a lower amplitude divided voltage signal. The divided voltage signal is sent to the first terminal of the digital proportional regulator, which is the signal input terminal. The second terminal of the digital proportional regulator is the control terminal, which receives the digital control quantity output by the digital signal processor. Based on the digital control quantity, the divided voltage signal is subjected to a second-stage proportional transformation, and finally the analog voltage signal after two stages of proportional adjustment is output.

[0022] In the control path, after the digital signal processor detects the system control command, it obtains the target set ratio of the external input, and performs reverse derivation calculation in combination with the fixed voltage division ratio of the resistor voltage divider network to obtain the digital control quantity required for the corresponding secondary regulation. Then, it sends the digital control quantity to the digital proportional regulator to complete the proportional setting of the entire voltage divider.

[0023] Schematic representation: The AC / DC inductive voltage divider can cover DC, power frequency, and wideband signals up to 3kHz, with an input impedance of no less than 1MΩ in the DC to 10kHz frequency band. The overall transformation ratio adjustment range corresponds to [-0.1, +0.1], which can meet the proportional requirements of most medium and low voltage precision measurement scenarios. The first terminal of the digital proportional controller is defined as the signal input terminal, used to input the divided voltage signal; the second terminal is defined as the control input terminal, used to input digital control quantities.

[0024] In a preferred embodiment of the present invention, an AC / DC inductive voltage divider system with a range covering 0-1000V is constructed. The fixed voltage division ratio of the resistive voltage divider network is 10:1, the adjustment range of the digital proportional regulator is [-1, 1], and the overall transformation ratio adjustment range of the AC / DC inductive voltage divider is [-0.1, +0.1]. When a 100V DC input signal needs to be attenuated by a 100:1 ratio, the digital signal processor receives the target transformation ratio instruction, calculates the required adjustment ratio for the second stage based on the 10:1 first-stage voltage division ratio, and outputs the corresponding digital control quantity to the digital proportional regulator. The input 100V DC signal enters the resistive voltage divider network after passing through a high-voltage potential tracker, attenuates to a 10V voltage signal, and then undergoes a second attenuation by the digital proportional regulator according to the set ratio, finally outputting a 1V analog voltage signal. Throughout the entire process, the DC signal exhibits no attenuation or phase shift, and the proportional error is controlled to the order of one part per million.

[0025] Traditional inductive voltage dividers rely on electromagnetic induction to achieve proportional transformation, with the output voltage being directly proportional to the frequency. The frequency domain characteristics of the core and windings limit their operation to near the power frequency, making them inoperable under DC conditions and causing significant errors over a wide frequency range. The AC / DC inductive voltage divider in this embodiment employs the principles of resistive voltage division, active tracking, and digital adjustment. The proportional relationship is determined by the resistance ratio, which is independent of the signal frequency. Since there are no frequency-sensitive components such as the core or windings in the signal path, and combined with the bandwidth coverage of the operational amplifier, it naturally possesses DC, power frequency, and wide frequency compatibility capabilities.

[0026] Meanwhile, traditional equipment relies on manual mechanical structures to adjust the transformer ratio, resulting in low accuracy and poor repeatability. This embodiment achieves proportional adjustment through digital signals, offering high accuracy and good repeatability, enabling programmed operation and adapting to automated testing systems. Furthermore, the high input impedance provided by the front-end high-voltage potential tracker significantly reduces the load effect on the circuit under test, improving measurement accuracy.

[0027] Preferably, it further includes a low-voltage potential tracker; the input terminal of the low-voltage potential tracker is connected to the output terminal of the resistor divider network, and the output terminal of the low-voltage potential tracker is connected to the first terminal of the digital proportional regulator; The low-voltage potential tracker is used to perform impedance isolation and potential tracking on the voltage divider signal to obtain a processed voltage divider signal, and then transmits the processed voltage divider signal to the digital proportional regulator.

[0028] Specifically, the low-voltage potential tracker consists of a low-offset operational amplifier connected between the resistor divider network and the subsequent circuitry, providing impedance isolation. Impedance isolation means that the impedance characteristics of the preceding and following circuits are decoupled through the high input impedance and low output impedance of the operational amplifier circuit, preventing the load of the following stage from affecting the operation of the preceding stage's voltage divider network. Potential tracking means that the output voltage follows the input voltage changes in real time, maintaining consistency in voltage amplitude and phase.

[0029] Indicatively, such as Figure 1 and Figure 2 As shown, the low-voltage potential tracker U5 is connected in series between the output of the resistor divider network and the signal input of the digital proportional controller. The divided voltage signal output by the resistor divider network is first connected to the input of the low-voltage potential tracker. The low-voltage potential tracker uses an emitter follower circuit to perform potential following on the input signal, and outputs a processed divided voltage signal with the same amplitude as the input signal, which is then transmitted to the signal input of the digital proportional controller.

[0030] The core function of a low-voltage potential tracker is impedance transformation. Its input impedance is extremely high, and it draws almost no current from the resistor divider network, ensuring that each series resistor in the voltage divider network always operates under the same current condition. At the same time, its output impedance is extremely low, which can drive the input circuit of the subsequent digital proportional regulator without changing the voltage division ratio due to load effects.

[0031] Schematic illustration: The low-voltage potential tracker uses a precision operational amplifier with a maximum offset voltage not exceeding 10μV to construct the voltage follower circuit. Relative to a primary side input voltage of 100V, its tracking error is approximately 10μV / 100V = 0.1ppm, demonstrating extremely high tracking accuracy.

[0032] In a preferred embodiment of the present invention, a low-voltage potential tracker is connected to the output of the 10:1 resistor voltage divider network, and the voltage divider network outputs a nominal 10V voltage divider signal. The low-voltage potential tracker uses a precision operational amplifier with an offset voltage of 5μV to form a voltage follower, with an input impedance greater than 1GΩ and an output impedance less than 1Ω. Test results show that before and after connecting the tracker, the actual voltage division ratio change of the voltage divider network is less than 0.1ppm, and the voltage division ratio fluctuation is less than 0.5ppm in the DC to 3kHz frequency band, effectively isolating the influence of the downstream load on the voltage divider network.

[0033] Without a low-voltage potential tracker, a resistor divider network directly connected to a subsequent digital proportional controller results in the input impedance of the latter being connected in parallel with the output resistor of the divider network, altering the actual voltage division ratio. Furthermore, variations in input impedance at different frequencies introduce additional frequency response errors. With a low-voltage potential tracker, the load on the divider network approaches an open circuit, ensuring consistent operating current, power consumption, and temperature rise for each resistor. This allows for better matching of resistor temperature drift characteristics, significantly improving long-term stability. For resistor divider networks of the same material and resistance value, maintaining consistent operating conditions for each resistor is crucial for high proportional accuracy. The low-voltage potential tracker ensures this through its circuit structure, a vital prerequisite for resistor divider networks to maintain high accuracy simultaneously under DC, power frequency, and wideband conditions.

[0034] Preferably, the resistor voltage divider network comprises several resistors connected in series; each resistor has the same resistance value and is made of the same material.

[0035] Specifically, resistors used in series exhibit significantly higher resistance accuracy, temperature stability, and long-term stability than ordinary resistors. Through screening, the resistance deviations of multiple resistors are controlled within a minimal range, ensuring high precision in the resistance ratio. Resistors made from the same resistive material exhibit consistent temperature coefficients, voltage coefficients, and other characteristics, resulting in good ratio stability.

[0036] Schematic, the resistor divider network consists of resistors R1-R10 connected in series, all using the same resistor material and having the same nominal resistance value. The total input terminal of the series branch receives the high-voltage signal output from the high-voltage potential tracker, and the end of the series branch is grounded. The divided voltage signal is taken from the resistor closest to ground to achieve a fixed-ratio voltage attenuation.

[0037] To ensure high accuracy of the voltage division ratio, resistors need to be screened and matched: under the same temperature environment, the resistance values ​​of a batch of resistors are measured using the same high-precision digital multimeter, and resistors with similar resistance values ​​are selected to form a series branch, so that the ratio of the total resistance of the upper resistor in the series branch to the resistance of the lower voltage division resistor strictly conforms to the target voltage division ratio.

[0038] Schematic illustration: Ten precision resistors with a nominal resistance of 10kΩ are connected in series to form a fixed voltage divider ratio of 10:1. The ratio of the total resistance of the first nine resistors in series to the resistance of the tenth resistor is 9:1. The initial accuracy of the resistors is 0.001%, the matching accuracy can reach 1ppm, and the temperature drift coefficient is no higher than... The screening process uses an 8.5-digit digital multimeter, which has a resolution on the order of one part per hundred million, and can meet the screening requirements with a matching accuracy of 1 ppm.

[0039] In a preferred embodiment of the present invention, 100 metal film precision resistors of the same batch, each nominally 10kΩ, are selected and subjected to 25... Under constant temperature conditions, the resistance values ​​were measured one by one using an 8.5-digit digital multimeter. Nine resistors with resistance deviations within 1 ppm were selected and connected in series to form the upper branch. Then, one resistor with a resistance value within 1 ppm deviation of 1 / 9 of the total resistance of the upper branch was selected to form the lower branch, together forming a 10:1 resistor voltage divider network. Testing showed that this resistor voltage divider network had a voltage division ratio error of less than 1 ppm at 25°C and a voltage ratio error of less than 1 ppm at -10°C. -40 Within the temperature range, the temperature drift of the partial pressure ratio is less than Within the DC to 3kHz frequency band, the voltage divider ratio frequency response error is less than 0.5ppm.

[0040] The proportional accuracy of traditional inductive voltage dividers depends on the manufacturing process of the core and windings, and is greatly affected by frequency. This resistive voltage divider network uses precision resistors of the same material and resistance value connected in series. The resistance ratio is determined only by geometry and materials, and is independent of signal frequency. Therefore, it maintains consistent proportional accuracy under DC, power frequency, and wideband conditions. Furthermore, resistors of the same material have the same temperature coefficient. When the ambient temperature changes, the resistance values ​​of all resistors change proportionally, and the resistance ratio remains constant, resulting in excellent temperature stability of the voltage division ratio. In contrast, the core losses and winding resistance of traditional inductive voltage dividers affect proportional accuracy with temperature variations, leading to poor temperature stability. Moreover, through batch screening and matching at the same temperature, extremely high proportional accuracy can be achieved with relatively low-cost resistors, eliminating the need for custom-made ultra-high-precision individual resistors, making it economical and highly feasible.

[0041] Preferably, the high-voltage potential tracker includes a high-voltage operational amplifier, a low-voltage operational amplifier, a first resistor, and a second resistor; the low-voltage operational amplifier, together with the first resistor and the second resistor, forms an offset compensation circuit. The high-voltage operational amplifier is used to perform potential following on the high-voltage input signal to be processed to obtain a high-voltage following signal, and to transmit the high-voltage following signal to the offset compensation circuit. The offset compensation circuit is used to perform offset voltage compensation and correction on the high voltage following signal to obtain a compensated high voltage input signal, and then transmit the compensated high voltage input signal to the resistor divider network.

[0042] Specifically, high-voltage operational amplifiers (op-amps) are operational amplifiers capable of withstanding high supply voltages and high input common-mode voltages, used for amplifying or tracking high-voltage signals. Zero-offset low-voltage op-amps are precision operational amplifiers with extremely low offset voltages, typically in the microvolt range, used for high-precision signal conditioning and error compensation. Offset compensation circuits are auxiliary circuits composed of op-amps and resistors, used to counteract errors caused by offset voltages in the main circuit, improving overall accuracy.

[0043] Indicatively, such as Figure 3 As shown, the high-voltage potential tracker includes a high-voltage operational amplifier U11, a low-voltage operational amplifier U12, a first resistor R11, and a second resistor R12; wherein the low-voltage operational amplifier is a zero-offset low-voltage operational amplifier, which together with the first resistor and the second resistor constitutes an offset compensation circuit.

[0044] The specific working process is as follows: the high-voltage input signal is connected to the non-inverting input terminal of the high-voltage operational amplifier device, the high-voltage operational amplifier device performs potential tracking on it to obtain a high-voltage tracking signal, and transmits the high-voltage tracking signal to the offset compensation circuit; the offset compensation circuit performs offset voltage compensation correction on the high-voltage tracking signal to cancel the offset error of the high-voltage operational amplifier itself, obtains the compensated high-voltage input signal, and transmits the compensated high-voltage input signal to the resistor voltage divider network.

[0045] To illustrate, the high-voltage operational amplifier has an offset voltage of approximately 1mV and an input impedance greater than 1MΩ; the first and second resistors are both 10kΩ, serving as high-precision matching resistors; the zero-offset low-voltage operational amplifier has an offset voltage of less than 10μV. When converted to a primary side input voltage of 100V, the compensated tracking error is approximately 10μV / 100V = 0.1ppm, and the compensated input impedance of the high-voltage potential tracker remains greater than 1MΩ.

[0046] In a preferred embodiment of the present invention, the high-voltage potential tracker uses a high-voltage operational amplifier as the main stage, paired with a zero-offset precision operational amplifier with an offset voltage of 8μV, and two 10kΩ precision resistors with a matching accuracy of 0.1% to form a compensation circuit. When a 100V DC high-voltage signal is input, the high-voltage operational amplifier itself has an offset of about 1.2mV. After correction by the compensation circuit, the residual offset voltage at the output terminal is less than 10μV, with a relative error of 0.1ppm. The input impedance test value is 1.2MΩ. Under a 10kHz AC signal, the input impedance still remains above 1MΩ, meeting the wideband operating requirements.

[0047] If a conventional high-voltage operational amplifier is used directly as a voltage follower, the millivolt-level offset voltage will introduce an error on the order of one ten-thousandth under a hundred-volt input, which cannot meet the requirements of precision measurement. If a high-voltage, high-precision operational amplifier is directly selected, the cost will increase exponentially, and offset optimization under high voltage is technically very difficult.

[0048] This embodiment employs an architecture combining a high-voltage operational amplifier (op-amp) for main tracking and a low-voltage zero-offset op-amp for compensation, achieving a balance between high voltage withstand capability and high accuracy. The high-voltage op-amp is responsible for withstanding the high voltage, while the low-voltage op-amp handles accuracy compensation. The combination of these two achieves high-voltage tracking accuracy on the order of 0.1 ppm at a relatively low cost, while maintaining high input impedance and significantly reducing the load effect on the measured high-voltage signal. Compared to the input impedance characteristics of traditional inductive voltage dividers, which are based on winding coupling and exhibit large input impedance variations with frequency, even failing to operate under DC conditions, this high-voltage potential tracker maintains an input impedance of over 1 MΩ across a DC to 10 kHz range, making it suitable for wideband AC / DC applications.

[0049] Preferably, the digital proportional controller includes a digital-to-analog converter, a zero-offset voltage precision operational amplifier, and several resistors; the zero-offset voltage precision operational amplifier and several resistors constitute a signal conversion and amplification circuit. The digital-to-analog converter is used to receive digital control signals, switch the internal electronic switch configuration based on the digital control signals, and convert the voltage divider signal into a weighted analog current signal based on the digital control signals. The signal conversion and amplification circuit is used to receive the weighted analog current signal, convert the weighted analog current signal and amplify it to obtain an analog voltage signal after two-stage proportional conversion.

[0050] Specifically, current-mode digital-to-analog converters (DACs) typically integrate an R-2R resistor network, which is switched to achieve a binary-weighted output of the current. The R-2R resistor network, consisting of resistors with resistances of R and 2R connected in a trapezoidal structure, is the core structure in the DAC for implementing binary weighting. Zero-offset precision operational amplifiers (op-amps) are precision operational amplifiers with extremely low offset voltages, used to convert current signals to voltage signals while ensuring conversion accuracy. The signal conversion and amplification circuit, composed of op-amps and resistors, achieves current-to-voltage conversion, amplification, and single-ended-to-bipolar conversion.

[0051] Indicatively, such as Figure 4 As shown, the digital proportional regulator U3 includes a digital-to-analog converter U31, a zero-offset voltage precision operational amplifier U32, and resistors R13-R16; the zero-offset voltage precision operational amplifier and several resistors constitute a signal conversion and amplification circuit, and the digital-to-analog converter is a high-precision current-mode digital-to-analog converter with a built-in R-2R resistor network.

[0052] First, the digital-to-analog converter receives digital control signals from the digital signal processor and switches the internal electronic switch configuration based on the digital control signals. At the same time, using the received voltage divider signal V2 as a reference voltage, the voltage divider signal V2 is converted into a weighted analog current signal V3 by taking advantage of the binary weighting characteristics of the R-2R resistor network.

[0053] Subsequently, the weighted analog current signal V3 is fed into the signal conversion and amplification circuit. The zero-offset precision operational amplifier converts the current signal into a voltage signal, and the conversion from single-ended current to bipolar voltage is achieved through a two-stage operational amplifier structure. The weighted analog current signal is then converted and amplified to finally obtain the analog voltage signal after two-stage proportional conversion. .

[0054] The working principle of an R-2R network is that, from the most significant bit to the least significant bit, the contribution of each bit to the output current decreases precisely by half. The current of all bits is summed at the output node, ultimately achieving a precise conversion from digital to analog. Its internal resistors are fabricated using submicron photolithography and laser trimming technology, resulting in extremely high accuracy and stability of the internal resistance ratio, which is the core factor ensuring the accuracy of proportional adjustment.

[0055] Schematic illustration: A 16-bit current-mode digital-to-analog converter is used, internally integrating a laser-adjusted R-2R resistor network. The second-stage voltage divider ratio is adjustable within the range of [-1.0, 1.0], with an adjustment resolution of 1 / 32768. The typical temperature coefficient of gain error across the entire range of the R-2R network is [value missing]. The proportional relationship is minimally affected by temperature. The matching zero-offset precision operational amplifier has an offset voltage of no more than 10μV, ensuring the accuracy of current-to-voltage conversion.

[0056] In a preferred embodiment of the present invention, the digital proportional gain regulator employs a 16-bit current-mode DAC chip, internally integrating an R-2R resistor network, and forming a bipolar output circuit with two stages of zero-offset precision operational amplifiers and matching resistors. When a 10V voltage divider signal is input, and the digital control quantity issued by the digital signal processor is 36044, the corresponding switch in the DAC's internal R-2R network conducts, outputting a weighted current. After being converted to voltage by the operational amplifier circuit, it outputs an analog voltage of approximately 0.99976V, corresponding to a two-stage voltage divider ratio of approximately 0.099976. The deviation from the theoretical value is less than the quantization error range, achieving an adjustment accuracy on the order of one part per million. Within the DC to 3kHz frequency band, the proportional gain fluctuation is less than 1ppm.

[0057] Traditional voltage dividers rely on mechanical switches or winding taps for ratio adjustment, resulting in large adjustment steps, low precision, and easy wear, and only allowing for a limited range of adjustments. This digital proportional controller achieves digital proportional adjustment based on an R-2R resistor network, offering high adjustment resolution and continuous stepless adjustment. Digital adjustment has a fast response speed, no mechanical wear, and good long-term stability. Furthermore, the proportional characteristics of the R-2R network are determined by the ratio of resistors within the chip, exhibiting frequency independence. Combined with the bandwidth of the operational amplifier, it maintains consistent adjustment accuracy across DC, mains frequency, and wideband environments. In addition, the bipolar output design allows the AC / DC inductive voltage divider to output positive and negative proportional voltage signals, adapting to the measurement requirements of both AC and bipolar DC signals. Compared to traditional manual adjustment methods, digital proportional adjustment can be automatically controlled by a program, enabling automated calibration and significantly improving testing efficiency.

[0058] Preferably, the digital signal processor is used to calculate digital control quantities based on the target set turns ratio and the voltage division ratio of the resistor voltage divider network, including: The second-stage voltage division ratio is calculated based on the target set ratio and the voltage division ratio of the resistor voltage divider network. The digital control quantity is calculated based on the second-order voltage ratio.

[0059] Specifically, the target set ratio represents the ratio of the voltage divider's output voltage to its input voltage, which is the user's desired ratio; that is, the overall target voltage division ratio of the voltage divider. The second-stage voltage division ratio represents the ratio of the output voltage to the input voltage achieved by the digital proportional regulator, and is the second-stage proportional regulation stage of the voltage divider. The digital control quantity represents the binary integer value input to the digital-to-analog converter (DAC), used to determine the output ratio of the DAC.

[0060] Schematic, the digital signal processor calculates and obtains the digital control quantity based on the target set transformer ratio and the voltage division ratio of the resistor voltage divider network. First, it calculates the second-level voltage division ratio based on the target set transformer ratio and the voltage division ratio of the resistor voltage divider network; that is, it divides the target set transformer ratio by the first-level fixed voltage division ratio to obtain the set value that the digital proportional controller needs to achieve. Then, it calculates the digital control quantity based on the second-level voltage division ratio; according to the quantization formula of the digital-to-analog converter, the second-level voltage division ratio is converted into the corresponding integer quantity and output to the digital proportional controller.

[0061] In addition, the digital signal processor will also perform reverse calculations based on the actual integer control values ​​issued to obtain the true second-stage voltage divider ratio, and then combine it with the first-stage voltage divider ratio to obtain the actual transformation ratio of the voltage divider as a whole, which is used for display and measurement to offset the impact of quantization errors caused by the digital-to-analog converter.

[0062] Schematic representation: The value range of the digital control quantity D is 0-65535, corresponding to a 16-bit binary width. The relationship between the two-stage voltage divider ratio and the digital control quantity is: Two-stage voltage divider ratio = D / 2 15 -1. The overall actual transformation ratio of the AC / DC inductive voltage divider is equal to the first-stage voltage divider ratio multiplied by the actual second-stage voltage divider ratio. A typical first-stage voltage divider ratio is 1 / 10, therefore the overall transformation ratio adjustment range is [-0.1, 0.1]. The digital signal processor uses a DSP chip with a processing power of at least 1 MSPS, equipped with an SPI interface, a display interface, and general-purpose I / O interfaces, which can meet the requirements for computation and peripheral control.

[0063] In a preferred embodiment of the present invention, the first-stage voltage division ratio K1 of the resistor voltage divider network is 1 / 10, and the second-stage voltage division ratio (the actual turns ratio of the digital proportional controller) is K2. have to Furthermore, the turns ratio designed for AC / DC induction voltage dividers Assuming the target is set at a ratio K setGiven a ratio of 100:1, substituting into the formula, the digital control quantity D = INT((0.1+1)×32768) = INT((0.1+1)×32768) = 36044. Substituting D = 36044 back into the second-stage voltage divider ratio formula, we get the actual second-stage voltage divider ratio = 36044 / 32768-1 ≈ 0.0999756; multiplying this by the first-stage voltage divider ratio of 0.1, we get the overall actual transformation ratio of the AC / DC inductive voltage divider ≈ 0.00999756, corresponding to an actual voltage divider ratio of approximately 100.024:1. The digital signal processor outputs this actual transformation ratio to the display module, which is used as the true proportional value of the AC / DC inductive voltage divider.

[0064] Traditional voltage dividers, after setting the turns ratio, have actual turns ratios affected by factors such as mechanical tolerances and contact resistance. Furthermore, the accurate actual turns ratio value cannot be obtained in real time, requiring external standard equipment for calibration, which is inconvenient. This embodiment uses digital calculation to automatically deduce the actual turns ratio after setting the target turns ratio, taking into account the quantization error of the DAC. The output actual turns ratio can be directly used as a metrological standard without additional calibration, improving ease of use and measurement reliability. Simultaneously, all calculations are automatically completed by a digital signal processor, resulting in fast calculation speed and high accuracy, avoiding human error caused by manual calculation or calibration, and providing a foundation for remote programmable control and automated testing.

[0065] Preferably, it further includes a display module; the display module is connected to the display interface of the digital signal processor; The display module is used to input and display the target set ratio.

[0066] Specifically, the display module is used to visually display the voltage divider parameters, and is typically an LCD screen. The display interface is the communication interface between the digital signal processor and the display module, used to transmit display data and control commands.

[0067] To illustrate, the display module is connected to the display interface of the digital signal processor. The digital signal processor sends parameters such as the target set ratio, actual overall ratio, input voltage amplitude, output voltage amplitude, and operating status of the voltage divider during operation to the display module through the display interface. After receiving the data, the display module displays the parameters on the screen in real time in the form of numbers, characters, or graphics for the operator to read.

[0068] Traditional multi-disc inductive voltage dividers typically lack integrated display functionality, requiring external auxiliary equipment such as voltmeters and turns ratio testers to read the output results. This is inconvenient for field use, and external equipment introduces additional load errors. This embodiment integrates a display module, directly showing the set and actual values ​​without the need for additional external instruments, simplifying field wiring and improving ease of use. It also avoids the load influence of external instruments, helping to ensure measurement accuracy. Furthermore, the resolution of the digital display is far higher than that of traditional pointer or dial-type readings, reducing human reading errors.

[0069] Preferably, it also includes a keyboard; the keyboard is connected to the I / O interface of the digital signal processor; The keyboard is used to input the target set ratio and system control commands.

[0070] Specifically, the keyboard is an input device used to input parameters and control commands to the voltage divider. The I / O interface represents the general-purpose input / output interface of the digital signal processor, used to connect peripherals such as keyboards and read the key press status.

[0071] To illustrate, the keyboard is connected to the I / O interface of the digital signal processor (DSP). Operators input target transformation ratio values, switch operating modes, and send system control commands such as start / stop via the keys. The DSP scans the key status in real time through the I / O interface, identifies the key input content and commands, and executes corresponding parameter modifications or function operations.

[0072] Traditional voltage divider ratio adjustment relies on manual rotation of switches or adjustment of winding taps, which is laborious, depends on the operator's feel for precision, and is prone to errors due to poor mechanical contact. This embodiment uses a keyboard to input digital values ​​to set the ratio, ensuring precise parameter input and simple, intuitive operation. It eliminates the need for mechanical adjustment structures, reducing errors caused by mechanical wear and contact resistance, and improving the reliability and lifespan of the voltage divider. Furthermore, the keyboard input combined with a digital display forms a complete human-machine interface, allowing operators to quickly set parameters and check status, thus improving work efficiency.

[0073] By implementing this embodiment, voltage proportional attenuation is achieved using a resistor divider network. The voltage division ratio is determined by the resistance ratio of the resistors within the network. The resistance ratio is an inherent property of the device and is independent of the input signal frequency. Regardless of whether the input is DC, power frequency, or broadband AC signal, the voltage distribution relationship of the series resistors remains stable, eliminating frequency domain errors caused by core magnetic saturation, magnetic loss, or parasitic winding parameters. This fundamentally eliminates the frequency dependence caused by electromagnetic induction. A high-voltage potential tracker receives and transforms the high-voltage signal, transmitting the measured high-voltage signal to the subsequent resistor divider network without significant attenuation. This ensures that the preceding high-voltage signal is completely transmitted to the resistor divider network without signal distortion due to impedance mismatch. The divided voltage signal output from the resistor divider network is sent to a digital proportional controller. The digital signal processor monitors system control commands, obtains the target set ratio, calculates the digital control quantity based on the division ratio of the resistor divider network, and sends it to the digital proportional controller. The digital proportional controller performs a two-stage digital proportional transformation on the divided voltage signal based on the digital control quantity. Digital proportional regulators achieve proportional adjustment through the resistor network of their internal digital-to-analog converters. The ratio is determined by the internal resistor ratios of the chip and does not rely on electromagnetic induction. The entire signal path contains no frequency-sensitive components such as iron cores or windings; the ratios of the first-stage voltage divider and the second-stage proportional conversion are both determined by the resistor ratios. These resistor ratios do not change regardless of whether the signal is DC or AC at different frequencies. The operational amplifier's bandwidth can cover DC to the target wideband range. Therefore, AC / DC inductive voltage dividers can simultaneously process DC signals, power frequency signals, and wideband signals, overcoming the inherent limitation of traditional multi-disc self-calibrating inductive voltage dividers, which can only operate at power frequency and cannot handle DC and wideband signals.

[0074] See Figure 5 This is a flowchart illustrating an AC / DC inductive voltage divider adjustment method based on digital proportional control, provided by an embodiment of the present invention. It is applicable to digital signal processors for AC / DC inductive voltage dividers. The AC / DC inductive voltage divider further includes a high-voltage potential tracker, a resistive voltage divider network, and a digital proportional controller. The output terminal of the high-voltage potential tracker is connected to the input terminal of the resistive voltage divider network. The output terminal of the resistive voltage divider network is connected to a first terminal of the digital proportional controller. The second terminal of the digital proportional controller is connected to the output terminal of the digital signal processor. The AC / DC inductive voltage divider adjustment method includes: S1. Upon detecting system control commands, obtain the target set ratio; S2. Calculate the digital control quantity based on the target set ratio and the voltage division ratio of the resistor voltage divider network; S3. The digital control quantity is transmitted to the digital proportional regulator, so that the digital proportional regulator performs a two-stage proportional transformation on the voltage divider signal based on the digital control quantity to obtain an analog voltage signal; Specifically, the high-voltage input signal to be processed is received by the high-voltage potential tracker and transmitted to the resistor voltage divider network; the high-voltage input signal is proportionally divided by the resistor voltage divider network to obtain a divided voltage signal, and the divided voltage signal is transmitted to the digital proportional regulator.

[0075] Preferably, the AC / DC inductive voltage divider further includes a low-voltage potential tracker; the input terminal of the low-voltage potential tracker is connected to the output terminal of the resistive voltage divider network, and the output terminal of the low-voltage potential tracker is connected to the first terminal of the digital proportional regulator. The low-voltage potential tracker is used to perform impedance isolation and potential tracking on the voltage divider signal to obtain a processed voltage divider signal, and then transmits the processed voltage divider signal to the digital proportional regulator.

[0076] Preferably, the resistor voltage divider network comprises several resistors connected in series; each resistor has the same resistance value and is made of the same material.

[0077] Preferably, the high-voltage potential tracker includes a high-voltage operational amplifier, a low-voltage operational amplifier, a first resistor, and a second resistor; the low-voltage operational amplifier, together with the first resistor and the second resistor, forms an offset compensation circuit. The high-voltage operational amplifier is used to perform potential following on the high-voltage input signal to be processed to obtain a high-voltage following signal, and to transmit the high-voltage following signal to the offset compensation circuit. The offset compensation circuit is used to perform offset voltage compensation and correction on the high voltage following signal to obtain a compensated high voltage input signal, and then transmit the compensated high voltage input signal to the resistor divider network.

[0078] Preferably, the digital proportional controller includes a digital-to-analog converter, a zero-offset voltage precision operational amplifier, and several resistors; the zero-offset voltage precision operational amplifier and several resistors constitute a signal conversion and amplification circuit. The digital-to-analog converter is used to receive digital control signals, switch the internal electronic switch configuration based on the digital control signals, and convert the voltage divider signal into a weighted analog current signal based on the digital control signals. The signal conversion and amplification circuit is used to receive the weighted analog current signal, convert the weighted analog current signal and amplify it to obtain an analog voltage signal after two-stage proportional conversion.

[0079] Preferably, the digital signal processor is used to calculate digital control quantities based on the target set turns ratio and the voltage division ratio of the resistor voltage divider network, including: The second-stage voltage division ratio is calculated based on the target set ratio and the voltage division ratio of the resistor voltage divider network. The digital control quantity is calculated based on the second-order voltage ratio.

[0080] Preferably, it further includes a display module; the display module is connected to the display interface of the digital signal processor; The display module is used to input and display the target set ratio.

[0081] Preferably, it also includes a keyboard; the keyboard is connected to the I / O interface of the digital signal processor; The keyboard is used to input the target set ratio and system control commands.

[0082] This embodiment relies on a resistor divider network to achieve proportional voltage attenuation. The voltage division ratio is determined by the resistance ratio of the resistors within the network. The resistance ratio is an inherent property of the device and is independent of the input signal frequency. Regardless of whether the input is DC, power frequency, or broadband AC signal, the voltage distribution relationship of the series resistors remains stable, eliminating frequency domain errors caused by core magnetic saturation, magnetic loss, or parasitic winding parameters. This eliminates the frequency dependence caused by electromagnetic induction at the fundamental level. A high-voltage potential tracker completes the high-voltage signal reception and impedance transformation, transmitting the measured high-voltage signal to the subsequent resistor divider network without significant attenuation. This ensures that the preceding high-voltage signal can be completely transmitted to the resistor divider network without signal distortion due to impedance mismatch. The divided voltage signal output from the resistor divider network is sent to a digital proportional controller. The digital signal processor monitors the system control commands, obtains the target set transformation ratio, calculates the digital control quantity based on the voltage division ratio of the resistor divider network, and sends it to the digital proportional controller. The digital proportional controller performs a two-stage digital proportional transformation on the divided voltage signal based on the digital control quantity. Digital proportional regulators achieve proportional adjustment through the resistor network of their internal digital-to-analog converters. The ratio is determined by the internal resistor ratios of the chip and does not rely on electromagnetic induction. The entire signal path contains no frequency-sensitive components such as iron cores or windings; the ratios of the first-stage voltage divider and the second-stage proportional conversion are both determined by the resistor ratios. These resistor ratios do not change regardless of whether the signal is DC or AC at different frequencies. The operational amplifier's bandwidth can cover DC to the target wideband range. Therefore, AC / DC inductive voltage dividers can simultaneously process DC signals, power frequency signals, and wideband signals, overcoming the inherent limitation of traditional multi-disc self-calibrating inductive voltage dividers, which can only operate at power frequency and cannot handle DC and wideband signals.

[0083] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An AC / DC inductive voltage divider based on digital proportional regulation, characterized in that, include: The system comprises a high-voltage potential tracker, a resistor voltage divider network, a digital proportional controller, and a digital signal processor; the output terminal of the high-voltage potential tracker is connected to the input terminal of the resistor voltage divider network; the output terminal of the resistor voltage divider network is connected to the first terminal of the digital proportional controller; and the second terminal of the digital proportional controller is connected to the output terminal of the digital signal processor. The high-voltage potential tracker is used to receive the high-voltage input signal to be processed and transmit the high-voltage input signal to the resistor divider network; The resistor voltage divider network is used to proportionally divide the high voltage input signal to obtain a divided voltage signal, and then transmit the divided voltage signal to the digital proportional regulator. The digital signal processor is used to obtain a target set ratio when a system control command is detected, calculate a digital control quantity based on the target set ratio and the voltage division ratio of the resistor voltage divider network, and transmit the digital control quantity to the digital proportional regulator. The digital proportional regulator is used to perform a two-stage proportional transformation on the voltage divider signal based on the digital control quantity to obtain an analog voltage signal.

2. The AC / DC inductive voltage divider based on digital proportional regulation as described in claim 1, characterized in that, It also includes a low-voltage potential tracker; the input terminal of the low-voltage potential tracker is connected to the output terminal of the resistor voltage divider network, and the output terminal of the low-voltage potential tracker is connected to the first terminal of the digital proportional regulator; The low-voltage potential tracker is used to perform impedance isolation and potential tracking on the voltage divider signal to obtain a processed voltage divider signal, and then transmits the processed voltage divider signal to the digital proportional regulator.

3. The AC / DC inductive voltage divider based on digital proportional regulation as described in claim 1, characterized in that, The resistor voltage divider network consists of several resistors connected in series; each resistor has the same resistance value and is made of the same material.

4. The AC / DC inductive voltage divider based on digital proportional regulation as described in claim 1, characterized in that, The high-voltage potential tracker includes a high-voltage operational amplifier, a low-voltage operational amplifier, a first resistor, and a second resistor; the low-voltage operational amplifier, together with the first resistor and the second resistor, forms an offset compensation circuit. The high-voltage operational amplifier is used to perform potential following on the high-voltage input signal to be processed to obtain a high-voltage following signal, and to transmit the high-voltage following signal to the offset compensation circuit. The offset compensation circuit is used to perform offset voltage compensation and correction on the high voltage following signal to obtain a compensated high voltage input signal, and then transmit the compensated high voltage input signal to the resistor divider network.

5. The AC / DC inductive voltage divider based on digital proportional regulation as described in claim 1, characterized in that, The digital proportional controller includes a digital-to-analog converter, a zero-offset voltage precision operational amplifier, and several resistors; the zero-offset voltage precision operational amplifier and several resistors constitute a signal conversion and amplification circuit. The digital-to-analog converter is used to receive digital control signals, switch the internal electronic switch configuration based on the digital control signals, and convert the voltage divider signal into a weighted analog current signal based on the digital control signals. The signal conversion and amplification circuit is used to receive the weighted analog current signal, convert the weighted analog current signal and amplify it to obtain an analog voltage signal after two-stage proportional conversion.

6. The AC / DC inductive voltage divider based on digital proportional regulation as described in claim 1, characterized in that, The digital signal processor is used to calculate, based on the target set turns ratio and the voltage division ratio of the resistor voltage divider network, a digital control quantity, including: The second-stage voltage division ratio is calculated based on the target set ratio and the voltage division ratio of the resistor voltage divider network. The digital control quantity is calculated based on the second-order voltage ratio.

7. The AC / DC inductive voltage divider based on digital proportional regulation as described in claim 1, characterized in that, It also includes a display module; the display module is connected to the display interface of the digital signal processor; The display module is used to input and display the target set ratio.

8. The AC / DC inductive voltage divider based on digital proportional regulation as described in claim 1, characterized in that, It also includes a keyboard; the keyboard is connected to the I / O interface of the digital signal processor; The keyboard is used to input the target set ratio and system control commands.

9. A method for regulating an AC / DC inductive voltage divider based on digital proportional control, characterized in that, A digital signal processor is applicable to AC / DC inductive voltage dividers; the AC / DC inductive voltage divider also includes a high-voltage potential tracker, a resistive voltage divider network, and a digital proportional regulator; the output terminal of the high-voltage potential tracker is connected to the input terminal of the resistive voltage divider network; the output terminal of the resistive voltage divider network is connected to the first terminal of the digital proportional regulator; The second terminal of the digital proportional regulator is connected to the output terminal of the digital signal processor; The AC / DC inductive voltage divider adjustment method includes: Upon detecting system control commands, the target set ratio is obtained; The digital control quantity is obtained by calculating based on the target set ratio and the voltage division ratio of the resistor voltage divider network; The digital control quantity is transmitted to the digital proportional regulator, so that the digital proportional regulator performs a two-stage proportional transformation on the voltage divider signal based on the digital control quantity to obtain an analog voltage signal; Specifically, the high-voltage input signal to be processed is received by the high-voltage potential tracker and transmitted to the resistor voltage divider network; the high-voltage input signal is proportionally divided by the resistor voltage divider network to obtain a divided voltage signal, and the divided voltage signal is transmitted to the digital proportional regulator.

10. The AC / DC inductive voltage divider regulation method based on digital proportional control as described in claim 9, characterized in that, The AC / DC inductive voltage divider also includes a low-voltage potential tracker; the input terminal of the low-voltage potential tracker is connected to the output terminal of the resistive voltage divider network, and the output terminal of the low-voltage potential tracker is connected to the first terminal of the digital proportional regulator. The low-voltage potential tracker is used to perform impedance isolation and potential tracking on the voltage divider signal to obtain a processed voltage divider signal, and then transmits the processed voltage divider signal to the digital proportional regulator.

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