Full-automatic current comparator high-voltage bridge based on FPGA and voltage control current source

Abstract

The invention provides a full-automatic current comparator based on an FPGA and a voltage control current source. The full-automatic current comparator high-voltage bridge comprises the components of a voltage divider, a high-voltage power supply, the FPGA, a first analog input module, a second analog input module, an RT, an industrial personal computer, a voltage control current source, an analog output module, a programmable amplifier, a current comparator and a tested sample. The current comparator comprises a testing coil, a first proportional coil and a second proportional coil. The testing coil and the programmable amplifier are used for testing the balance degree of the current comparator. The two proportional coils with fixed numbers of coils are respectively connected with the tested sample and the voltage control current source. Comparative current measurement of the sample current is realized according to an ampere turns balance principle. The full-automatic current comparator high-voltage bridge based on the FPGA and the voltage control current source can realize measurement on capacitance and loss factor of a capacitive tested sample and measurement on inductance and quality factor of an inductive tested sample in a high-voltage condition.

Description

technical field [0001] The invention relates to electrical measurement technology, in particular to a full-automatic current ratio high voltage bridge based on FPGA and voltage control current source. Background technique [0002] Under high voltage conditions, the capacitance value and loss factor of capacitive test products are mostly measured by the bridge method, and the main equipment is a high-voltage Xilin bridge and a high-voltage current ratio bridge. [0003] The high-voltage Xilin bridge is the most traditional equipment for measuring the capacitance value and loss factor of capacitive samples. Its working principle is as follows: Figure 1A shown. Specifically, the test sample is equivalent to a complex impedance and compared with a standard capacitor, and the standard resistor R3 and capacitor C4 of the proportional arm on the low-voltage side are adjusted to meet the equal product of the impedance on the opposite side to achieve bridge balance, and then calcula...

AI Technical Summary

Problems solved by technology

This method realizes automatic measurement, but the extracted voltage signal and current signal belong to direct measurement, there is no definite benchmark, and the measurement accuracy is very limited

[0006] In summary, no matter the existing bridge method or the phase comparison method, they either have low precision, or require manual operation and have high technical requirements for operators, and cannot simultaneously achieve high-precision measurement and automatic measurement

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