作为中性束注入加热系统的核心设备，弧流电源的性能至关重要。打坑电路是弧流电源的重要组成部分，其动态响应特性及稳定性决定了弧流电源的性能。提出了一种用于弧流电源的新型打坑电路解决方案，能在150 μs内快速实现大电流的跌落和恢复，并且跌落和恢复过程中基本无过冲，用于转移的电子开关（比如IGBT）在开关过程中过电压小，可靠性高，吸收电路容易实现。该方案可以很好地替代传统的弧流电源打坑电路。

As the core equipment of the neutral beam injection heating system, the performance of arc power supply is very important. With the development and popularization of super capacitor technology, arc current power supply based on super capacitor has been widely used in many large-scale scientific devices. Pit circuit is an important component of arc current power supply. Its dynamic response characteristics and stability determine the performance of arc current power supply. A new current transfer circuit for arc current power supply is proposed in this paper, which can quickly fall and recover large current in 100 μs, and there is no overshoot in the fall and recovery process. The electronic switch for transfer (such as IGBT) has small overvoltage, high reliability and easy absorption circuit in the process of switching. The scheme is a good alternative to the traditional current pit circuit.