A Novel Tunable Frequency Current Source Based on FPGA for The Verification Scheme of DC Immune Current Transformer

This paper introduces the principles and test results of a new tunable frequency current source based on FPGA for use in the verification scheme of DC immune current transformers. The design of the current source is mainly divided into two parts. The first part involves the design of an FPGA-based signal generator, while the second part designs a voltage-constant current wide-bandwidth linear power amplification circuit capable of delivering high current output. This enables the input voltage to be converted into an output current that is amplified by a factor of two.