Resonant inverting-buck converter

This study presents a new resonant inverting step-down DC-DC converter. A half-bridge inverter and an LC resonant tank are employed. The resonant tank is the medium of energy transfer and provides soft-switching conditions at turn-on and turn-off switching instants for all active elements. The voltage conversion ratio is adjustable, and the converter is automatically shut down at output short circuit. Its characteristics are very similar to half-bridge series-resonant converter, except that input and output terminals possess common ground and voltage gain up to unity can be achieved at discontinuous conduction mode. Practical results from a laboratory prototype verify the presented theoretical analysis.