The invention discloses a vehicle, a vehicle-mounted charging system and a control method of a PFC circuit in the vehicle-mounted charging system. The PFC circuit comprises at least one phase of high-frequency bridge arm; the high-frequency bridge arm comprises a first switch tube, a second switch tube and a first capacitor; the first capacitor is connected in parallel with the first switch tube; the control method comprises the following steps: when the first switch tube is controlled to be conducted and the second switch tube is controlled to be closed, acquiring first voltage parameter information at two ends of the first capacitor; according to the first voltage parameter information, judging whether the first switch tube is in zero-voltage conduction or not; and when the first switch tube does not realize zero-voltage conduction, increasing the first conduction duration of the second switch tube according to a preset rule so as to reduce the voltage when the first switch tube is conducted again. According to the method, zero-voltage conduction of the high-frequency switching tube in the PFC circuit can be realized, the switching-on loss and the switching-off loss of the high-frequency switching tube are reduced, and the working efficiency of a vehicle-mounted charging system can be improved.
本发明公开了一种车辆、车载充电系统及其中PFC电路的控制方法,PFC电路包括至少一相高频桥臂,高频桥臂包括第一、二开关管和第一电容,第一电容与第一开关管并联,控制方法包括:当控制第一开关管导通且控制第二开关管关闭时,获取第一电容两端的第一电压参数信息;根据第一电压参数信息判断第一开关管是否零电压导通;当第一开关管未实现零电压导通,则按照预设规则增大第二开关管的第一导通时长,以减小第一开关管再次导通时的电压。该方法可实现PFC电路中高频开关管的零电压导通,降低高频开关管的开通损耗和关断损耗,有利于提高车载充电系统的工作效率。
Vehicle, vehicle-mounted charging system and control method of PFC circuit in vehicle-mounted charging system
车辆、车载充电系统及其中PFC电路的控制方法
2022-02-18
Patent
Electronic Resource
Chinese
IPC: | H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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