Abstract: This paper presents a design scheme of rod position detector excitation power based on feedforward control. High-frequency switching AC-DC-AC inverter circuit is used in this scheme, and the feedforward control is added on the traditional Proportional-Integral (PI) control to suppress the influence of measurable and uncontrollable factors on the controlled object. Through theoretical analysis and simulation test, the design scheme proposed in this paper is verified, and it can reduce the output ripple, and improve the current amplitude accuracy while ensuring the corresponding control time.