| Summary: | Car charger is the key equipment for the development of electric vehicles. Such equipment is prone to exceed the maximum temperature rising limitation when operating in high temperature environment. Meanwhile, the device temperature of the vehicle equipment is difficult to obtain directly due to the road conditions and other issues, and therefore cannot achieve the temperature protection. In this paper, a smart power adjustment method based on the power device lumped parameter thermal circuit model is proposed aimed at overcoming this problem. In this method, the power device that has the highest temperature inside the charger is analyzed firstly. Then, power device lumped parameter thermal circuit model is established, which is correlated with the ambient temperature and output power. Next, the optimal model parameters can be effectively estimated via the least square method. The experimental results verify that the power control method based on the thermal path model can effectively limit the temperature rising of the charger power device, and improve the thermal stability of the charger.
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