Suppression of Ripple Current in High Step-Up DC-DC Converter utilizing Cockcroft-Walton Circuit with Inductor

It has become necessary to reduce the volume of high step-up DC-DC converters for high-voltage DC power supplies. In this report, an isolated high step-up DC-DC converter is proposed for them. The proposed converter consists of the LLC converter and the Cockcroft-Walton (CW) circuit with an inductor. The proposed converter boosts the output voltage by double LC resonances of primary circuit and secondary circuit respectively. It is experimentally clarified that the inductor on the secondary side in the proposed converter plays the role of not only boosting the output voltage, but also suppressing ripples of transformer primary and secondary currents.