Design of a PWM inverter regarding conducted EMC and losses: influence of some key parameters

摘要

An analytical model of both EMC and losses of a PWM inverter is presented, taking into account the most significant parameters. EMC representation replaces semiconductors with equivalent disturbance sources. Then, solving is achieved using simple transfer functions. Conduction losses are evaluated from on state voltage drop (taken from datasheet) and current in the switches. Commutation losses are computed from reference switching energy (datasheet) considered linear with the switched current. Based on this analytical approach, it is easy to investigate the role of the key design parameters of the inverter, regarding EMC and losses aspects. PWM strategy is thus investigated, as well as the DC bus level. Some variations on component technology are also presented.