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임재상(Jae-Sang Lim),강구배(Gubae Kang),장한근(Han Geun Jang),박주영(Jooyoung Park),임성엽(SeongYeop Lim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
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.