A new high performance zero-voltage zero-current mixed mode switching DC/DC converter

A high-performance DC-DC converter that has good DC characteristics and operates on constant-frequency, variable-duty mode in a wide load range is proposed. It also has low switching loss, low voltage stress, and low electromagnetic interference. Owing to these features, the converter overcomes most of the limitations of resonant and quasi-resonant converters, such as high VA rating of resonant elements, variable frequency operation, and limited load range, and improves on the efficiency and DC characteristics of the pseudo-resonant converter. The proposed converter is thought to be suitable for high-power applications (above several kVA) as well as for low-power applications with high power density and high performance. Simulation results are shown under the conditions of 100 kHz and 1 kVA load