In this paper, a novel half-bridge integrated zero-voltage full-bridge soft-switching DC-DC converter based on the secondary auxiliary resonant loop is proposed for medium to high power applications with medium and high voltage output. Compared with the other converters, this converter can eliminate circulation losses and reduce the reverse recovery losses of the rectifier diodes, improving the efficiency of the converter. The overall volume of the converter is reduced and the power density is increased. The principles, circuit characteristics and soft switching conditions of the converter are analyzed in detail. The performance and effectiveness of the circuit are verified by experiments based on a 1.2 kW–50 kHz circuit.