WO2022016813A1 - 一种通过对电流传感器电压补偿的电流校准方法及*** - Google Patents
一种通过对电流传感器电压补偿的电流校准方法及*** Download PDFInfo
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- WO2022016813A1 WO2022016813A1 PCT/CN2020/140697 CN2020140697W WO2022016813A1 WO 2022016813 A1 WO2022016813 A1 WO 2022016813A1 CN 2020140697 W CN2020140697 W CN 2020140697W WO 2022016813 A1 WO2022016813 A1 WO 2022016813A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- sampling
- current
- voltage
- power supply
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 108
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Definitions
- the invention relates to the calibration of a current sensor, in particular to a current calibration method and system by compensating the voltage of the current sensor.
- the performance of the torque loop directly affects the control effect of the system. Improving the control accuracy and stability of the current loop can improve the performance of the torque loop. Therefore, improving the sampling accuracy of the phase current can further improve the control accuracy of the system, thereby improving the safety performance of the system.
- the ground plane of the current sensor may deviate from the ground plane sampled by the MCU and ADC, and the fluctuation of the power supply of the current sensor will also cause the deviation of the current sampling value, it is necessary to perform a certain voltage compensation on the current sensor, so as to measure the current calibration.
- a current calibration method by compensating the voltage of a current sensor including:
- Vnom is the rated voltage of the current sensor power supply
- a current calibration system for voltage compensation of a current sensor comprising:
- a sensor current sampling circuit for sampling to obtain the sensor sampling voltage V out ;
- a sensor power supply sampling circuit for sampling to obtain the sampling voltage V cc of the power supply
- the sensor ground plane sampling circuit is used for sampling to obtain the ground plane sampling voltage V GND_sensor ;
- the calibration module is used for calibrating the sensor sampling voltage V out according to the power supply sampling voltage V cc and the ground plane sampling voltage V GND_sensor , and obtaining the calibrated sensor current value according to the calibrated sensor sampling voltage V out_correct .
- the calibration module adopts an MCU.
- the calibration module may also adopt a DSP.
- the sensor current sampling circuit, the sensor power supply sampling circuit, and the sensor ground plane sampling circuit are ADC sampling, and output digital sampling signals to the calibration module respectively.
- the sampling current can be calibrated, thereby improving the accuracy of current sampling.
- the advantage is that it solves the problem of inaccurate current sampling caused by the unstable power supply of the current sensor, does not need to add an additional reference current circuit, and reduces the cost of the circuit.
- FIG. 2 is a schematic diagram of current calibration by voltage compensation of a current sensor provided by an embodiment of the present application.
- the current calibration system provided by the embodiment of the present application by compensating the voltage of the current sensor circuit 1 includes:
- the sensor current sampling circuit 2 is used for sampling to obtain the sensor sampling voltage V out ;
- the sensor power supply sampling circuit 3 is used for sampling to obtain the sampling voltage V cc of the power supply;
- the sensor ground plane sampling circuit 4 is used for sampling to obtain the ground plane sampling voltage V GND_sensor ;
- the calibration module 5 is used for calibrating the sensor sampling voltage V out according to the power supply sampling voltage V cc and the ground plane sampling voltage V GND_sensor , and obtaining the calibrated sensor current value according to the calibrated sensor sampling voltage V out_correct .
- the calibration module 5 uses other sampling processing devices such as MCU or DSP to sample the output current of the current sensor.
- Vnom is the rated voltage of the current sensor power supply
- the MCU samples the current output by the current sensor to obtain the sampling voltage V out as 2.5V, the rated voltage V nom of the current sensor power supply is 5V, and the MCU samples the current sensor's power supply V cc and ground V GND_sensor to obtain 5.1 V, 0.2V, then the calibrated sensor sampling voltage obtained by the voltage compensation of the current sensor:
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
Claims (5)
- 一种通过对电流传感器电压补偿的电流校准***,其特征在于,包括:传感器电流采样电路,用于采样得到传感器采样电压V out;传感器供电电源采样电路,用于采样得到供电电源采样电压V cc;传感器地平面采样电路,用于采样得到地平面采样电压V GND_sensor;校准模块,用于根据供电电源采样电压V cc和地平面采样电压V GND_sensor,对传感器采样电压V out进行校准,根据校准后的传感器采样电压V out_correct,得到校准后的传感器电流值。
- 根据权利要求2所述的通过对电流传感器电压补偿的电流校准***,其特征在于,所述校准模块采用MCU。
- 根据权利要求2所述的通过对电流传感器电压补偿的电流校准***,其特征在于,所述校准模块采用DSP。
- 根据权利要求3或4所述的通过对电流传感器电压补偿的电流校准***,其特征在于,所述传感器电流采样电路、所述传感器供电电源采样电路、所述传感器地平面采样电路均为ADC采样,分别输出数字采样信号到所述校准模块。
Priority Applications (1)
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---|---|---|---|
US17/697,652 US20220206101A1 (en) | 2020-07-22 | 2022-03-17 | Current calibration method and system by compensating voltage of current sensor |
Applications Claiming Priority (2)
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CN202010708260.X | 2020-07-22 | ||
CN202010708260.XA CN111929629A (zh) | 2020-07-22 | 2020-07-22 | 一种通过对电流传感器电压补偿的电流校准方法及*** |
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US17/697,652 Continuation US20220206101A1 (en) | 2020-07-22 | 2022-03-17 | Current calibration method and system by compensating voltage of current sensor |
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WO2022016813A1 true WO2022016813A1 (zh) | 2022-01-27 |
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PCT/CN2020/140697 WO2022016813A1 (zh) | 2020-07-22 | 2020-12-29 | 一种通过对电流传感器电压补偿的电流校准方法及*** |
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US (1) | US20220206101A1 (zh) |
CN (1) | CN111929629A (zh) |
WO (1) | WO2022016813A1 (zh) |
Families Citing this family (3)
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CN111929629A (zh) * | 2020-07-22 | 2020-11-13 | 一巨自动化装备(上海)有限公司 | 一种通过对电流传感器电压补偿的电流校准方法及*** |
CN113863919A (zh) * | 2021-09-28 | 2021-12-31 | 西南石油大学 | 一种井下随钻应变片式压力传感器输出的Barton校正装置及方法 |
CN115308664B (zh) * | 2022-10-10 | 2023-03-24 | 苏州矩阵光电有限公司 | 霍尔电流传感器的校准装置及方法 |
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2020
- 2020-07-22 CN CN202010708260.XA patent/CN111929629A/zh active Pending
- 2020-12-29 WO PCT/CN2020/140697 patent/WO2022016813A1/zh active Application Filing
-
2022
- 2022-03-17 US US17/697,652 patent/US20220206101A1/en not_active Abandoned
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