DocumentCode :
1755902
Title :
Hybrid phase shifted full bridge and LLC half bridge DC-DC converter for low-voltage and high-current output applications
Author :
Mengyuan Yu ; Deshang Sha ; Xiaozhong Liao
Author_Institution :
Sch. of Autom., Beijing Inst. of Technol., Beijing, China
Volume :
7
Issue :
7
fYear :
2014
fDate :
41821
Firstpage :
1832
Lastpage :
1840
Abstract :
A hybrid phase shifted full bridge (PSFB) and LLC half bridge (HB) DC-DC converter for low-voltage and high-current output applications is proposed in this study. The PSFB shares its lagging leg with the LLC-HB and their outputs are parallel connected. When the output current is small, the energy of LLC circuit in combination with the energy stored in the leakage inductance of PSFB´s transformer can help the lagging leg switches to achieve zero voltage switching (ZVS) turn on, which can reduce voltage stress and avoid annoying voltage spikes over switches. For the power distribution at rated power, the PSFB converter undergoes most of the power whereas the LLC-HB converter working as an auxiliary part converts only a small portion of the total power. To improve the conversion efficiency, synchronous rectification technique for the PSFB DC-DC converter is implemented. The design principle is given in view of ZVS for lagging leg switches and low transconductance of LLC converter. The validity of the proposed converter has been verified by experimental results of a 2.5 kW prototype.
Keywords :
DC-DC power convertors; bridge circuits; phase shifters; power supply quality; rectification; switches; switching convertors; transformers; zero voltage switching; LLC half bridge DC-DC converter; LLC-HB converter; PSFB; ZVS; energy storage; high-current output application; hybrid phase shifted full bridge DC-DC converter; lagging leg switch; leakage inductance; low-voltage output application; power 2.5 kW; power distribution; synchronous rectiflcation technique; transformer; voltage spike; voltage stress reduction;
fLanguage :
English
Journal_Title :
Power Electronics, IET
Publisher :
iet
ISSN :
1755-4535
Type :
jour
DOI :
10.1049/iet-pel.2013.0778
Filename :
6852050
Link To Document :
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