关键词: 无刷电机；浪涌电流；预充电路；电机控制器

Abstract: When the new energy vehicle is started and powered on, the high-voltage input will generate a surge current at the moment of opening, and when the surge current is too large, it will lead to the failure of electronic devices connected to the high-voltage. In order to prevent this, a precharge circuit can be added to the circuit system. Taking the brushless motor drive controller of new energy vehicles as an example, this paper expounds the role of the precharging circuit in the high-voltage brushless motor controller, and designs the corresponding precharging circuit. The experimental results show that the precharge circuit can avoid the damage of related devices caused by excessive surge current.

Key words: Brushless motor; Surge current; Precharging circuit; Motor controller