A Novel Isolated DC-DC Converter with Configurable Structure for Wide Output Voltage Range Operation

Traditional LLC converter is widely used for renewable energy application due to its wide output voltage range. However, LLC converter achieves wide output voltage range by changing the switching frequency, which leads to difficulties in magnetic component design. To overcome this issue, a novel isolated DC-DC converter with configurable structure is proposed. It assembles a H-bridge, a LC resonant tank and two rectifier units. The proposed converter enables four-times adjustment of output voltage by simply arranging the configurable rectifier units in parallel or series in pulse width modulation manner at a fixed switching frequency. Compared with the traditional LLC converter, the proposed converter reduces the switch capacity by 32.8%. The feasibility of the proposal is verified by simulation in MATLAB/Simulink.