一个DC-AC-DC的变换器，通过DC-AC的前级串联，AC-DC的后级并联，降低了MOSFET的电压应力，若采用交错控制技术，可大大减少输出电流纹波，可提高变换器的功率密度.-A DC-AC-DC converter, through the front stage series DC-AC, and the parallel of AC-DC, reduced MOSFET voltage stress, if the interleaving control technology, which can greatly reduce the output current ripple, can increase the power density of the converter.