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1. (WO2018099468) ELECTRIC VEHICLE, DC-DC CONVERTOR, AND CONTROL METHOD FOR DC-DC CONVERTOR

Pub. No.:    WO/2018/099468    International Application No.:    PCT/CN2017/114234
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Sat Dec 02 00:59:59 CET 2017
IPC: H02M 3/335
Applicants: BYD COMPANY LIMITED
比亚迪股份有限公司
Inventors: ZHANG, Ni
张妮
WANG, Xinghui
王兴辉
WANG, Chao
王超
SHEN, Xiaofeng
沈晓峰
WU, Baihe
邬白贺
Title: ELECTRIC VEHICLE, DC-DC CONVERTOR, AND CONTROL METHOD FOR DC-DC CONVERTOR
Abstract:
An electric vehicle, a DC-DC convertor, and a control method for the DC-DC convertor. The control method comprises the following steps: when a DC-DC convertor works every time, obtaining a total time TC for controlling an H bridge by using a third manner and a total time TD for controlling the H bridge by using a fourth manner, and obtaining a set time Ti for controlling the H bridge by using the third manner and a set time Tm for controlling the H bridge by using the fourth manner in each working cycle in a working process of the DC-DC convertor (S1); determining a relationship between the TC and the TD (S2); and according to the relationship between the total time TC and the total time TD, selecting a manner for controlling the H bridge when the DC-DC convertor is started, and alternately controlling the H bridge according to the Ti and the Tm, so as to perform temperature equalization control on a first switch transistor, a second switch transistor, a third switch transistor and a fourth switch transistor (S3). In this way, the heat generation of the first to the fourth switch transistors in the H bridge is relatively balanced, thereby improving the working life of the switch transistors in the H bridge.