An analysis of a resonant half bridge dual converter operating in continuous and discontinuous modes

A half bridge dual converter has been previously shown to have operational advantages in low input voltage applications as frequently found in photovoltaic systems. This paper introduces a resonant version of this converter and analyses its operation in a range of continuous and discontinuous resonance modes. The new topology makes use of the transformer leakage inductance and the switching device capacitance. The design is tolerant of transformer and output rectifier capacitance. Soft switching occurs for both the input switching devices and output diodes. Experimental results for a 1 MHz, 85 W 20 V DC input, 360 V DC output DC-DC converter designed as part of a photovoltaic module integrated converter are presented.