Title :
Input-Series-Output-Parallel Phase-Shift Full-Bridge Derived DC–DC Converters With Auxiliary LC Networks to Achieve Wide Zero-Voltage Switching Range
Author :
Zhiqiang Guo ; Deshang Sha ; Xiaozhong Liao ; Jiankun Luo
Author_Institution :
Key Lab. of Intell. Control & Decision of Complex Syst., Beijing Inst. of Technol., Beijing, China
Abstract :
This letter proposes an input-series-output-parallel derived dc-dc converter composed of two phase-shift full-bridge (PSFB) dc-dc converters and two auxiliary LC networks. Each LC network is connected between the leading-leg midpoint of a module and the lagging-leg midpoint of the other one. For conventional PSFB converters, the lagging-leg switches may lose zero-voltage switching (ZVS) conditions at light loads. In the proposed converter, ZVS for lagging-leg switches can be achieved with the aid of the LC networks even at light loads. The efficiency of the converter at the light load is improved. Therefore, the proposed converter is suitable for the wide load range. The feature of the converter is analyzed. The performance of the proposed converter is verified by a 900 W experimental prototype.
Keywords :
DC-DC power convertors; LC circuits; phase shifters; zero voltage switching; PSFB DC-DC converters; ZVS; auxiliary LC networks; full-bridge derived DC-DC converters; input-series-output-parallel DC-DC converters; lagging-leg midpoint; lagging-leg switches; leading-leg midpoint; phase-shift DC-DC converters; power 900 W; wide zero-voltage switching range; Bridge circuits; Capacitors; Inductance; Inductors; Logic gates; Switches; Zero voltage switching; Input-series-output-parallel (ISOP) derived; LC network; phase-shift full bridge (PSFB); wide load range; zero-voltage switching (ZVS);
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2014.2309342
