Improvements in Boost Ratio, Power Factor, and Efficiency for Cockcroft-Walton Circuit with SiC Diode

Abstract

The Cockcroft-Walton (CW) circuit, which is well known as a high step-up rectifier, is used in a lot of systems. The boost ratio of the circuit decreases according to the load current and the diode junction capacitor. In addition, it is necessary for these rectifiers to use some power factor correctors. This paper investigates the circuit with SiC diodes and an added inductor. The proposed circuit is focused on LC resonance between the added inductor and the diode junction capacitors. It is experimentally clarified that the LC resonance improves the boost ratio, the power factor, and the efficiency in the proposed circuit.