PWM 인버터에서 스위치 전류의 해석과 그 예측에 관한 연구

A Study on the Analysis and Prediction of switch currents in PWM inverters

Theoretical average current and rms current equations are solved using the analytical method in the 3phase voltage-fed inverter. Experimental switch current equations are established by simulation and compared with theoretical equations. As a result of analysis, average and rms currents of switch devices are represented by a function as power factor and modulation index. Especially, equations of this paper are represented as a function of a single factor(K) equal to the product of the power factor and modulation index. Method that can find current levels of switch devices for inverter design and conduction loss of inverter in a simple and accurate manner is presented. Influences of modulation method on switch current are also studied.