In this paper, a zero-current switching (ZCS) current source converter (CSC) topology is proposed by adding an auxiliary circuit between the dc side. During each commutating process, the auxiliary circuit is activated, so that the outgoing switches can be turned off with zero current switching. As a result, all active switches can reach ZCS operations. This feature makes it possible to increase the switching frequency to improve the line current quality where a small size of ac filter is required. That means the presented ZCS CSC topology is very suitable for some applications with high PWM frequency. Simulation gives the verification.