Abstract: A scheme of dual active bridge converter based on switched capacitor access applied in micro-grid DC distribution system was presented and analyzed in this paper. When the ratio of dc voltages of the converter does not match the high frequency transformer’s turn ratio, high frequency link’s voltage match can be achieved by adding a short circuit conduction process of the primary full bridge. The proposed scheme can be functioned as a DC switch also, it can be switched out quickly when a DC side short circuit fault occurs, and can be switched on very quickly when the fault disappears, and this improves the reliability of the system. In this paper, the characteristics of voltage and current, conduction behavior and control strategies are analyzed thoroughly. On the basis of this, the correctness and practicability of the proposed scheme are verified by simulation and physical experiment.