파워모듈 열특성을 고려한 HEV/EV 출력 성능 개선

This paper presents an approach for constructing an electro-thermal model of IGBT-devices as inverters considering variable switching frequencies and battery voltage for HEV/EV. IGBT losses depend on current, battery voltage, and switching frequency. Conventional inverter system uses a fixed switching frequency, but variable frequencies operation is needed to reduce switching losses and decrease junction temperature of IGBT. This paper develops the loss function of IGBT thermal model when switching frequencies vary. As a result, a difference between real temperature and estimated temperature of IGBT is reduced and hill holding performance of HEV/EV is improved.