A DCCT-based 100-A DC current source with high stability

Abstract

This paper presents a simple solution to realize a 100-A dc current source with high stability. The new source is based on an improved voltage-controlled current source (VCCS) circuit, and a wideband dc current transducer (DCCT) is added for high-current conversion in the feedback loop. The advantage of this modification is that the power consumption on the sample resistor of the VCCS can be greatly reduced, thus the resistor stability can be easily guaranteed. The preliminary measurement results show that the current stability of the designed source is better than 0.5 ppm/h.