Development of 10kA Standard DC Constant Current Source

Abstract

The traditional high-precision DC large current sensor has the problem of direct calibration, so 10kA standard DC constant current source device is developed. The device make use of modular design and is composed of 18 constant current sources in parallel, and each constant current source is 600A. The 600A constant current source designed a deep negative feedback loop, and the self-developed 600A zero flux sensor was used as the feedback element of the output current. Each 600A constant current source is designed with a high-power diode as a fixed load, the diode can not only ensure the stability of the output current of a single constant current source, but also eliminate the mutual interference between the constant current sources in parallel. The output current structure of the device uses the form of copper bars. It is shown by tests that the current accuracy of the device is better than 0.01 %, and the current relative stability is better than 10ppm/min, which fully meets the calibration requirements of high precision current sensors.