Abstract: For the thermal design of electric vehicle controller, it is necessary to consider the temperature rise of insulated gate bipolar transistor (IGBT) at low output frequency to prevent the IGBT from burning out at low output frequency. Because the low frequency load condition of IGBT is a short-time transient process, the experimental test cannot be realized, so the transient simulation is used to verify and improve the actual design. In this paper, the transient simulation of Fuji power module with water-cooled heat dissipation is carried out, and the temperature response of the power module IGBT is compared between the conventional mode and the output frequency of 50 Hz, 20 Hz, 10 Hz, 5 Hz and 2 Hz in 450 A working condition. The results show that with the decrease of IGBT output frequency, the maximum temperature gradually increases, among which the maximum temperature of 5 Hz and 2 Hz is 162 ℃ and 181 ℃ respectively, which is 39 ℃ and 58 ℃ higher than that of conventional mode.

Key words: New energy vehicle; Vehicle controller; IGBT; Output frequency; Transient simulation; Dissipate heat

摘要： 针对电动汽车控制器的热设计，需要考虑低输出频率情况下绝缘栅双极型晶体管 （IGBT）的温升情况，从而防范 IGBT 在低输出频率工况下烧毁。由于 IGBT 低频载荷工况 为短时瞬态过程，实验测试无法实现，故采用瞬态仿真验证改进实际设计。论文针对采用水 冷散热的富士功率模块进行瞬态仿真计算，对比了 450 A工况下常规模式和输出频率为 50 Hz、 20 Hz、10 Hz、5 Hz 和 2 Hz 情况下功率模块 IGBT 的温度响应情况。结果表明，随着 IGBT 输出频率的降低，最高温度逐步升高，其中 5 Hz 和 2 Hz 最高温度分别为 162 ℃和 181 ℃， 与常规模式相比分别提高了 39 ℃和 58 ℃。

关键词: 新能源汽车；汽车控制器；IGBT；输出频率；瞬态仿真；散热