说明：  Abstract—Series resonant DC-DC converter with clamped capacitor voltage exhibits excellent characteristics in forward operating mode including simple control, high reliability, soft switching, high power density and inherently limited load fault current. However, the conventional single angle phase-shift modulation that works well in the forward mode cannot reverse the power flow. In this paper, we propose a modulation strategy for reverse mode operation by utilizing three phase-shift angles afforded by the two active full bridges of the circuit. We identify the optimal modulation trajectories in three-dimensional modulation space and implement a look-up table based modulator for power flow control. A high-fidelity simulation