Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Three-Phase ZVS DC-DC Converter with Low Transformer Turn Ratio for High Step-up and High Power Applications
Authors Joon-Geun Kim ; Chan-Soo Park ; Se-Wan Choi ; Ga-Woo Park
DOI 10.6113/TKPE/2011.16.3.242
Page pp.242-249
ISSN 1229-2214
Keywords Three-phase DC-DC converter; Active-clamping; Soft-switched; Boost-half-bridge; Voltage doubler; High step-up; Fuel cells
Abstract The proposed converter has easy device selection for high step-up and high power applications since boost half bridge and voltage doubler cells are connected, respectively, in parallel and series in order to increase output power and voltage. Especially, optimized design of high frequency transformers is possible owing to reduced turn ratio and eliminated dc offset, and distributed power through three cores is beneficial to low profile and thermal distribution. The proposed converter does not necessitate start-up circuit and additional clamp circuit due to the use of whole duty range between 0 and 1 and is suitable for applications with wide input voltage range. Also, high efficiency can be achieved since ZVS turn on of switches are achieved in wide duty cycle range and ZCS turn on and off of diodes are achieved. The proposed converter was validated through 5 ㎾ prototype.