Calibration method and system for high-precision large-voltage sampling of hardware single board
By constructing a closed-loop calibration environment and dynamically correcting calibration parameters, the problem of inaccurate sampling caused by device differences and temperature drift in high voltage sampling of hardware boards was solved, achieving high-precision and stable voltage sampling, and improving the metrological reliability and fault diagnosis capability of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-19
- Publication Date
- 2026-04-03
AI Technical Summary
Existing technologies suffer from inaccurate sampling in high-voltage sampling on hardware boards due to individual device differences, temperature drift, reference voltage drift, and ADC nonlinearity. This makes it difficult to meet the high-precision requirement of ±0.2% FS level. In particular, the error is significantly amplified near the high and low voltage endpoints, affecting the system's metrological compliance and fault diagnosis sensitivity.
A closed-loop calibration environment is constructed. By coordinating the output of different voltage values of the high-voltage source through the control terminal, sampling data is acquired and new calibration parameters are calculated. Combined with the verification steps, dynamic correction and gain compensation are achieved. An external high-stability DC voltage source is used as the metrological reference to support verification and iterative recalibration.
It achieves high-precision, batch-consistent, and anti-aging high-voltage sampling calibration across the entire range, improving the metrological reliability and engineering maintainability of charging piles and BMS equipment.
Smart Images
Figure CN121784414A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power electronics and automatic testing technology, specifically to a calibration method and system for high-precision high-voltage sampling on a hardware board. Background Technology
[0002] In electric vehicle charging infrastructure and energy storage battery management systems, accurate sampling of high voltages (e.g., 200 V–1000 V) on the DC bus or battery pack is crucial for ensuring system safety, accurate metering, and reliable condition assessment. Existing technologies generally employ a resistor divider network combined with a microcontroller's built-in ADC for high-voltage sampling. The voltage division ratio is set by a high-precision, low-temperature drift resistor, and the ADC reference voltage typically uses an internal or external precision reference chip. The sampled data is then converted linearly (V = k × ADC + b) to output the voltage value. This solution is simple in structure and low in cost, and has been widely used in various charging pile main control boards, BMS acquisition boards, and other hardware boards.
[0003] However, this existing technology relies solely on fixed hardware parameters and initial calibration coefficients. In actual mass production and long-term operation, it is difficult to cope with complex error sources such as individual device differences, temperature drift, reference voltage time drift, ADC nonlinearity, and temperature drift of voltage divider resistors. This results in poor sampling consistency between single boards of the same model, uneven full-range accuracy, and increased deviation after aging. It cannot meet the requirements of ±0.2% FS (full-scale) level high-precision voltage detection. In particular, the error is significantly amplified near the high and low voltage endpoints, which restricts the system's metrological compliance and fault diagnosis sensitivity. Summary of the Invention
[0004] The purpose of this invention is to provide a calibration method and system for high-precision high-voltage sampling of hardware single boards, which can solve the problem of inaccurate sampling caused by ADC nonlinearity error, reference voltage drift and voltage divider circuit error during high-precision high-voltage sampling of hardware single boards.
[0005] To achieve the above objectives, the present invention provides the following technical solutions: The first aspect provides a calibration method for high-precision high-voltage sampling on a hardware board, comprising the following steps: setting up a calibration environment, which includes a control terminal, a high-voltage source, and a hardware board to be calibrated; establishing communication connections between the control terminal and the high-voltage source and the hardware board; controlling the high-voltage source to output a first voltage value; obtaining first sampling data from the hardware board by sampling the first voltage value based on first original calibration parameters; controlling the high-voltage source to output a second voltage value; obtaining second sampling data from the hardware board by sampling the second voltage value based on the first original calibration parameters; calculating a new set of calibration parameters based on the first voltage value, the second voltage value, the first sampling data, and the second sampling data; sending the new calibration parameters to the hardware board for application; and performing calibration verification steps after applying the new calibration parameters. In one optional embodiment, the first original calibration parameters include a first scaling factor k and a first offset b. The original voltage calculation formula of the hardware board is: V = k × ADC + b; where V is the sampled voltage value and ADC is the value obtained by the ADC channel of the hardware board and filtered. In one alternative embodiment, the new calibration parameters include a second proportionality coefficient k1 and a second offset b1. After applying the new calibration parameters, the voltage calculation formula of the hardware board is adjusted to: V = (k × ADC + b) × k1 + b1. In one optional embodiment, the calibration verification step specifically includes: the control terminal controls the high-voltage source to output a verification voltage value; the control terminal acquires verification sampling data obtained by the hardware board sampling the verification voltage value after applying new calibration parameters; it determines whether the verification sampling data meets the preset accuracy requirements. If it does, the calibration is completed; if it does not, a second calibration is performed based on the verification voltage value and the verification sampling data to calculate the third proportional coefficient k2 and the third offset b2. In an alternative embodiment, after performing a secondary calibration, the voltage calculation formula of the hardware board is further adjusted to: V = ((k × ADC + b) × k1 + b1) × k2 + b2. In one optional embodiment, the control terminal is a computer running host computer software, and the high voltage source is a DC high voltage source that can receive instructions through a communication interface to adjust the output voltage. In one optional embodiment, the control terminal is connected to the high-voltage source via a first communication interface and to the hardware board via a second communication interface; the first communication interface is an RS485 interface and the second communication interface is a CAN bus interface. In one optional embodiment, during the establishment of communication connections between the control terminal and the high-voltage source and the hardware board, the control terminal performs a communication handshake with the high-voltage source and the hardware board respectively to confirm that the connection is normal. In one optional embodiment, after the control terminal obtains the first sampling data obtained by sampling the first voltage value based on the first original calibration parameters from the hardware board, the step further includes a step of judging the reasonableness of the range of the obtained first sampling data; if it is judged to be unreasonable, the calibration process is terminated; after the control terminal obtains the second sampling data obtained by sampling the second voltage value based on the first original calibration parameters from the hardware board, the step further includes a step of judging the reasonableness of the range of the second sampling data; if it is judged to be unreasonable, the calibration process is terminated.
[0006] The second aspect provides a calibration system for high-precision high-voltage sampling of a hardware board, comprising: a calibration environment setup module for setting up a calibration environment, including a control terminal, a high-voltage source, and a hardware board to be calibrated, wherein the control terminal establishes communication connections with the high-voltage source and the hardware board respectively; a first output control module for enabling the control terminal to control the high-voltage source to output a first voltage value; a first sampling acquisition module for enabling the control terminal to acquire first sampling data obtained by sampling the first voltage value based on first original calibration parameters from the hardware board; a second output control module for enabling the control terminal to control the high-voltage source to output a second voltage value; a second sampling acquisition module for enabling the control terminal to acquire second sampling data obtained by sampling the second voltage value based on the first original calibration parameters from the hardware board; a calibration parameter calculation module for enabling the control terminal to calculate a new set of calibration parameters based on the first voltage value, the second voltage value, the first sampling data, and the second sampling data; a calibration parameter distribution module for distributing the new calibration parameters to the hardware board for application; and a calibration verification module for performing calibration verification steps after applying the new calibration parameters.
[0007] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a calibration method for high-precision, high-voltage sampling on a hardware board. By constructing a closed-loop calibration environment including a control terminal, a high-voltage source, and the hardware board to be calibrated, the control terminal coordinates the output of two different voltage values from the high-voltage source and acquires the corresponding sampling data under the original calibration. New calibration parameters are calculated based on the two-point measured values and theoretical values, and verification and iterative recalibration are supported. Because an external, highly stable DC voltage source is used as the metrological benchmark, and the two-point calibration is combined with a closed-loop verification mechanism, the method solves the problems of systematic error accumulation, insufficient temperature drift compensation, and poor long-term stability caused by relying solely on initial hardware parameters and single-point calibration in existing technologies. Therefore, it achieves high-precision, batch-consistent, and anti-aging high-voltage sampling calibration across the entire measurement range, significantly improving the metrological reliability and engineering maintainability of charging piles and BMS equipment. Attached Figure Description
[0008] Figure 1 This is a schematic diagram of a calibration process for high-precision high-voltage sampling on a hardware board, as described in an embodiment of the present invention. Detailed Implementation
[0009] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.
[0010] See Figure 1 This invention provides a calibration method for high-precision high-voltage sampling on a hardware board, comprising the following steps: A calibration environment is set up, which includes a control terminal, a high voltage source, and a hardware board to be calibrated. The control terminal establishes communication connections with the high voltage source and the hardware board respectively. The control terminal controls the high-voltage source to output a first voltage value; The control terminal obtains first sampling data from the hardware board, which is obtained by sampling the first voltage value based on the first original calibration parameters. The control terminal controls the high-voltage source to output a second voltage value; The control terminal obtains second sampling data from the hardware board, which is obtained by sampling the second voltage value based on the first original calibration parameters. The control terminal calculates a new set of calibration parameters based on the first voltage value, the second voltage value, the first sampling data, and the second sampling data. The new calibration parameters are then sent to the hardware board for application. After applying the new calibration parameters, perform a calibration verification step.
[0011] Through the above steps, this application achieves the following: using the control terminal as the central hub, a high-confidence closed-loop calibration environment is constructed by coordinating the high-voltage source and the hardware board through RS485 and CAN dual buses; the system response is stimulated using two differentiated voltage excitation points to obtain first and second sampled data; based on the first voltage value, the second voltage value, the first sampled data, and the second sampled data, a new set of calibration parameters is calculated; the new calibration parameters are sent to the hardware board for application; and after applying the new calibration parameters, a calibration verification step is performed.
[0012] In a more specific embodiment of the present invention, the control terminal is connected to the high-voltage source through a first communication interface and to the hardware board through a second communication interface; the first communication interface is an RS485 interface and the second communication interface is a CAN bus interface.
[0013] In a more specific embodiment of the present invention, the first original calibration parameters include a first proportional coefficient k and a first offset b. The original voltage calculation formula of the hardware board is: V = k * ADC + b; where V is the sampled voltage value and ADC is the value obtained by the ADC channel of the hardware board and filtered.
[0014] The first scaling factor k represents the nominal scaling relationship between the hardware board's analog front-end and the overall gain link of the analog-to-digital converter (ADC). The first scaling factor k is determined by the resistor ratio of the voltage divider circuit, the operational amplifier gain, the ADC reference voltage (Vref), and the quantization bit depth. The first offset b represents the zero-point error of the entire sampling link, measured in V. Its sources include, but are not limited to: the operational amplifier input offset voltage, the thermoelectric potential of the lower arm resistor in the voltage divider network, the inherent bias error of the ADC, and the DC offset introduced by common-mode noise from the PCB traces. In the uncalibrated state, b is typically non-zero, ranging from ±5 mV to ±50 mV. V is the final output sampled voltage value, i.e., the physical voltage dimension result visible to the user or readable by the upper-layer software.
[0015] In a more specific embodiment of the present invention, the new calibration parameters include a second proportionality coefficient k1 and a second offset b1. After applying the new calibration parameters, the voltage calculation formula of the hardware board is adjusted as follows: V = (k*ADC+b)*k1+b1.
[0016] The new calibration parameters refer to a set of dynamic correction parameters calculated based on the first voltage value, the second voltage value, the first sampling data, and the second sampling data during the calibration process. Their physical meaning is the gain and bias compensation amount of the original voltage calculation result after a quadratic linear transformation. These parameters do not cover or replace the original calibration parameters (k, b), but are superimposed on the original calculation link in a cascade manner, thereby achieving flexible expansion and iterative improvement of the calibration model without modifying the underlying voltage conversion logic of the hardware board firmware.
[0017] In a more specific embodiment of the present invention, the calibration and verification steps specifically include: The control terminal controls the high-voltage source to output a verification voltage value. The control terminal is a computer running host computer calibration software. The control terminal establishes a bidirectional communication connection with the high-voltage source through an RS485 communication interface and has a command issuance, status feedback reception, and timeout retransmission mechanism. The high-voltage source is a DC high-voltage source that can receive commands through the communication interface to adjust the output voltage. It supports 0–1200 V continuously adjustable output with an output accuracy better than ±0.02% FS. It also has a built-in digital potentiometer and a high-stability reference voltage module to ensure a high degree of consistency between the voltage set value and the actual output value. The control terminal obtains verification sampling data obtained by the hardware board after applying the new calibration parameters and sampling the verification voltage value; The hardware board is an embedded voltage detection unit equipped with a microcontroller (MCU), a dedicated analog-to-digital converter (ADC), a voltage divider sampling circuit, and a CAN communication module. The ADC channel of the hardware board outputs a stable ADC value after digital filtering (such as moving average filtering or IIR low-pass filtering). The new calibration parameters refer to the second proportional coefficient k1 and the second offset b1, which have been sent to the hardware board through the CAN bus interface and written into a non-volatile memory (such as EEPROM or a specified sector of Flash). The parameter loading and operation link switching have been completed before the verification sampling. The verification sampling data is the median or mean value of the verification voltage value after the hardware board performs no less than 5 consecutive samplings under the new parameter effect, with each sampling interval ≥10 ms to suppress power frequency interference and random noise.
[0018] Determine whether the verification sampling data meets the preset accuracy requirements. If it does, the calibration is completed. If it does not, perform a second calibration based on the verification voltage value and the verification sampling data to calculate the third proportional coefficient k2 and the third offset b2.
[0019] In a more specific embodiment of the present invention, the preset accuracy requirement is an absolute error threshold set according to the target application scenario. For example, in the charging pile BMS voltage detection scenario, the threshold is ±0.5 V (corresponding to a 0–1000 V range); in the energy storage system battery cluster voltage inspection scenario, the threshold is ±0.2% × actual voltage value. This threshold can be configured and stored in the host computer software parameter library, and supports automatic matching according to device model, batch number, or calibration ambient temperature. The judgment process is as follows: substitute the verification sampling data into the updated voltage calculation formula V = (k × ADC + b) × k1 + b1 to obtain the calibrated voltage estimate V_est; subtract it from the verification voltage value V_ref and take the absolute value |V_est|. V_ref|;If the absolute value is less than or equal to the preset accuracy threshold, it is determined to be "compliant". The control terminal sends a calibration success command to the hardware board (CAN frame ID=0x1F0, Data[0]=0x01). The hardware board locks the current k1 and b1 parameters and exits the calibration mode accordingly. If it is not compliant, a second calibration is performed based on the verification voltage value and the verification sampling data to calculate the third proportional coefficient k2 and the third offset b2.
[0020] After performing the secondary calibration, the control terminal initiates a new round of parameter fitting calculations, no longer relying on the original two-point method, but adopting a single-point incremental correction strategy. The voltage calculation formula of the hardware board is further adjusted as follows: V = ((k*ADC+b)*k1+b1)*k2+b2.
[0021] Through the above-described steps, this application achieves the following: using the verification voltage value as an independent verification anchor point, breaking the inherent limitations of relying solely on two-point fitting, and constructing a closed-loop quality control mechanism of "calibration-verification-recalibration" without increasing hardware costs. Specifically, the non-collinearity selection of the verification voltage value allows the system to effectively expose latent error sources such as voltage divider resistor temperature drift, ADC integral nonlinearity, and long-term reference voltage drift. Multi-cycle filtering and communication verification of the verification sampling data ensure the reliability of the input data. The tiered configurability of preset accuracy requirements adapts to the quality level requirements of different application scenarios. Furthermore, the flexible solution strategy (single-variable constraint / bivariate optimization) for k2 and b2 in the secondary calibration balances computational efficiency and correction accuracy, enabling the calibration system to be rapidly deployed on production lines and deeply optimized under laboratory-level accuracy requirements. Therefore, it solves the technical problems in the background technology where unreliable calibration results and unstable measurement accuracy over a wide voltage range are caused by insufficient identification of systematic deviations, achieving the technical effects of improving calibration robustness, enhancing environmental adaptability, and ensuring product consistency upon delivery.
[0022] In a more specific embodiment of the present invention, during the establishment of communication connections between the control terminal and the high-voltage source and the hardware board, the control terminal performs a communication handshake with the high-voltage source and the hardware board respectively to confirm that the connection is normal.
[0023] In a more specific embodiment of the present invention, after the control terminal obtains the first sampling data obtained by sampling the first voltage value based on the first original calibration parameters from the hardware board, the method further includes a step of judging the reasonableness of the range of the obtained first sampling data; if it is judged to be unreasonable, the calibration process is terminated; after the control terminal obtains the second sampling data obtained by sampling the second voltage value based on the first original calibration parameters from the hardware board, the method further includes a step of judging the reasonableness of the range of the second sampling data; if it is judged to be unreasonable, the calibration process is terminated.
[0024] The dual independent criteria of the first and second sampled data constitute a redundant safety barrier; the two respectively cover the typical operating ranges of the low-voltage and high-voltage segments, jointly constraining the data credibility boundary within the entire calibration voltage range; the range judgment logic is deeply coupled with the initial calibration parameters k and b, enabling the criteria to have adaptive capabilities—when k and b change due to batch differences or firmware version changes, the theoretical expected range is automatically updated to avoid misjudgment of fixed thresholds; while the hard termination mechanism embeds data quality control into the starting node of the calibration main process, forming a closed-loop control chain of "acquisition is verification".
[0025] Through the above-described steps, this application achieves real-time, hierarchical, and adaptive rationality screening of hardware board voltage sampling data. After acquiring the first and second sampling data, the control terminal performs interval discrimination based on the theoretical model and forcibly terminates the process when either discrimination fails. This solves the technical problem in the background technology of generating incorrect calibration parameters due to abnormal sampling data (such as noise interference, ADC saturation, voltage divider failure, and communication packet errors), thereby improving the safety, diagnostic efficiency, and reliability of the final result of the calibration process. This mechanism does not rely on additional hardware detection circuits and can achieve early fault interception through software logic alone, taking into account both cost control and functional completeness.
[0026] In another embodiment provided by the present invention, the specific method implementation process is as follows: A calibration environment is set up, which includes a control terminal, a high voltage source, and a hardware board to be calibrated. The control terminal establishes communication connections with the high voltage source and the hardware board respectively. Start running the host computer tooling software; The host computer tooling software first establishes a handshake with the high-voltage source and hardware board to confirm that the connection is normal. The host computer controls the high-voltage source to output a low voltage of approximately 200V. The host computer obtains the sampled voltage value under the above voltage from the hardware board and determines whether the voltage range is reasonable. If it is reasonable, the calibration continues; if it is unreasonable, the calibration ends and the problem is checked. The host computer controls the high-voltage source to output a high voltage of approximately 1000V; The host computer obtains the sampled voltage value under the above voltage from the hardware board and determines whether the voltage range is reasonable. If it is reasonable, the calibration continues; if it is unreasonable, the calibration ends and the problem is checked.
[0027] If the process is deemed appropriate, continue; if it is deemed inappropriate, terminate the calibration and investigate the problem. After receiving the data, the hardware board saves it. The host computer controls the high-voltage source to output 450V. The host computer obtains the voltage value of the hardware board under the new sampling coefficient and determines whether the sampling accuracy meets the requirements. It then determines whether to end the calibration at this point or perform a second calibration based on this initial calibration.
[0028] In another embodiment of the present invention, a calibration system for high-precision high-voltage sampling of a hardware board is also provided, comprising: The calibration environment setup module is used to set up a calibration environment, which includes a control terminal, a high-voltage source, and a hardware board to be calibrated. The control terminal establishes communication connections with the high-voltage source and the hardware board, respectively. The first output control module is used to enable the control terminal to control the high voltage source to output a first voltage value; The first sampling acquisition module is used to enable the control terminal to acquire first sampling data from the hardware board, which is obtained by sampling the first voltage value based on the first original calibration parameters. The second output control module is used to enable the control terminal to control the high voltage source to output a second voltage value; The second sampling acquisition module is used to enable the control terminal to acquire second sampling data from the hardware board, which is obtained by sampling the second voltage value based on the first original calibration parameters. The calibration parameter calculation module is used to enable the control terminal to calculate a new set of calibration parameters based on the first voltage value, the second voltage value, the first sampling data, and the second sampling data. The calibration parameter distribution module is used to distribute the new calibration parameters to the hardware board for application. The calibration verification module is used to perform calibration verification steps after the new calibration parameters are applied.
[0029] This application realizes the full software definition and modular encapsulation of the calibration process: the control end does not require a dedicated hardware coprocessor, and only a general computing platform (such as an x86 industrial computer or an ARM embedded host) needs to run modular software to complete the complete closed loop from environment construction to effect verification.
[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. A calibration method for high-precision high-voltage sampling on a hardware board, characterized in that, Includes the following steps: A calibration environment is set up, which includes a control terminal, a high voltage source, and a hardware board to be calibrated. The control terminal establishes communication connections with the high voltage source and the hardware board respectively. The control terminal controls the high-voltage source to output a first voltage value; The control terminal obtains first sampling data from the hardware board, which is obtained by sampling the first voltage value based on the first original calibration parameters. The control terminal controls the high-voltage source to output a second voltage value; The control terminal obtains second sampling data from the hardware board, which is obtained by sampling the second voltage value based on the first original calibration parameters. The control terminal calculates a new set of calibration parameters based on the first voltage value, the second voltage value, the first sampling data, and the second sampling data. The new calibration parameters are then sent to the hardware board for application. After applying the new calibration parameters, the hardware board performs calibration verification steps.
2. The calibration method for high-precision high-voltage sampling on a hardware board according to claim 1, characterized in that, The first original calibration parameters include a first proportionality coefficient k and a first offset b. The original voltage calculation formula for the hardware board is as follows: V = k * ADC + b; Where V is the sampled voltage value, and ADC is the value obtained by the ADC channel of the hardware board and filtered.
3. The calibration method for high-precision high-voltage sampling on a hardware board according to claim 2, characterized in that, The new calibration parameters include a second proportionality coefficient k1 and a second offset b1. After applying the new calibration parameters, the voltage calculation formula of the hardware board is adjusted as follows: V = (k*ADC+b)*k1+b1.
4. The calibration method for high-precision high-voltage sampling on a hardware board according to claim 3, characterized in that, The calibration and verification steps specifically include: The control terminal controls the high-voltage source to output a verification voltage value; The control terminal obtains verification sampling data obtained by the hardware board after applying the new calibration parameters and sampling the verification voltage value; Determine whether the verification sampling data meets the preset accuracy requirements. If it does, the calibration is completed. If it does not, perform a second calibration based on the verification voltage value and the verification sampling data to calculate the third proportional coefficient k2 and the third offset b2.
5. The calibration method for high-precision high-voltage sampling on a hardware board according to claim 4, characterized in that, After performing the secondary calibration, the voltage calculation formula for the hardware board is further adjusted as follows: V = ((k*ADC+b)*k1+b1)*k2+b2.
6. The calibration method for high-precision high-voltage sampling on a hardware board according to claim 1, characterized in that, The control terminal is a computer running host computer software, and the high voltage source is a DC high voltage source that can receive instructions through a communication interface to adjust the output voltage.
7. The calibration method for high-precision high-voltage sampling on a hardware board according to claim 6, characterized in that, The control terminal is connected to the high-voltage source through a first communication interface and to the hardware board through a second communication interface; the first communication interface is an RS485 interface and the second communication interface is a CAN bus interface.
8. The calibration method for high-precision high-voltage sampling on a hardware board according to claim 1, characterized in that, The control terminal establishes communication connections with the high-voltage source and the hardware board respectively, and performs a communication handshake with the high-voltage source and the hardware board respectively to confirm that the connection is normal.
9. The calibration method for high-precision high-voltage sampling on a hardware board according to claim 8, characterized in that, After the control terminal obtains the first sampled data obtained by sampling the first voltage value based on the first original calibration parameters from the hardware board, it also includes a step of judging the reasonableness of the range of the obtained first sampled data; if it is judged to be unreasonable, the calibration process is terminated. After the control terminal obtains the second sampling data obtained by sampling the second voltage value based on the first original calibration parameters from the hardware board, it also includes a step of judging the reasonableness of the range of the second sampling data; if it is judged to be unreasonable, the calibration process is terminated.
10. A calibration system for high-precision, high-voltage sampling on a hardware board, characterized in that, include: The calibration environment setup module is used to set up a calibration environment, which includes a control terminal, a high-voltage source, and a hardware board to be calibrated. The control terminal establishes communication connections with the high-voltage source and the hardware board, respectively. The first output control module is used to enable the control terminal to control the high voltage source to output a first voltage value; The first sampling acquisition module is used to enable the control terminal to acquire first sampling data from the hardware board, which is obtained by sampling the first voltage value based on the first original calibration parameters. The second output control module is used to enable the control terminal to control the high voltage source to output a second voltage value. The second sampling acquisition module is used to enable the control terminal to acquire second sampling data from the hardware board, which is obtained by sampling the second voltage value based on the first original calibration parameters. The calibration parameter calculation module is used to enable the control terminal to calculate a new set of calibration parameters based on the first voltage value, the second voltage value, the first sampling data, and the second sampling data. The calibration parameter distribution module is used to distribute the new calibration parameters to the hardware board for application. The calibration verification module is used to perform calibration verification steps after the new calibration parameters are applied.