In modern radar control system,the speed stability and fixed point accuracy of servo system directly affect the final image quality.This article focuses on the research of the power device metal-oxide-semiconductor filed-effect transistor(MOSFET)in permanent magnet synchronous electric control system.The problem of MOSFET Miller effect is analyzed,and the circuit model and turn-on process of MOSFET are introduced.The causes of voltage oscillation of Miller effect on the drive circuit are analyzed.Tow optimization circuits are designed to suppress the amplitude of the gate-source pulse voltage generated by the Miller effect.Theoretical analysis and experimental results show that the improved drive circuit has limited suppression of gate source pulse volt-age spikes caused by Mille effect.The improved circuit has been applied to 20 kHz/1 kW motor controller,effectively improves the stability of radar servo system and environmental adaptability.
维普
万方数据