A highly-efficient two-stage DC-DC converter with wide input voltage

This paper introduces a highly-efficient two-stage DC-DC converter with wide input voltage. Based on the digital control technology, it uses two-stage DC-DC conversion. This paper describes the circuit topology, working principle and control method of the convert in detail. The converter consists of the former input circuit, intermediate conversion circuit, output rectifying circuit and feedback control circuit. Through the adaption of the former input circuit, the DC-DC converter avoids the drawback of unreasonable design of transformer turn ratio on the rated input voltage conditions, and then achieves the optimal efficiency of intermediate transformer in the case of rated input voltage. This highly efficient two stage converter control circuit is simple, reliable and easy to implement. In this paper, the working principle of the topology is described in detail, and it is verified by experiments that the topology can meet the requirements of high efficiency, high power density and wide input range of communication power supply modules.