DocumentCode :
2468775
Title :
Light load efficiency improvement for multi-channel PFC
Author :
Wang, Chuanyun ; Xu, Ming ; Lee, Fred C. ; Luo, Zheng
Author_Institution :
Center for Power Electron. Syst., Virginia Polytech. Inst. & State Univ., Blacksburg, VA
fYear :
2008
fDate :
15-19 June 2008
Firstpage :
4080
Lastpage :
4085
Abstract :
With the fast growing information technologies, AC-DC front-end power supply design is facing extremely tough challenges due to the continuously increasing power density and efficiency requirement. For the PFC stage, how to reduce the boost inductor and the EMI filter size without compromising the efficiency is the key to meet the challenges. Lots of techniques has been studied and proposed during the last several years. Among these techniques, multi-channel interleaving is a quite promising one. By staggering the channels at uniform intervals, multichannel interleaved PFC can reduce the EMI filter size significantly due to the ripple cancellation effect. In addition, the interleaving multi-channel configuration makes it possible to implement the phase-shedding to improve the PFC light load efficiency. Today, the power supply industry is spending tremendous effort on improving the PFC light efficiency due to the economic reasons and environmental concerns. By decreasing the number of active channels according to the load, the PFC light load efficiency can be optimized. In this paper, the phase-shedding control is proposed to improve the PFC light load efficiency and the issues on the EMI filter design are investigated. To improve the light load efficiency without compromising the EMI filter size, the asymmetrical phase angle control strategy is proposed, and is verified and demonstrated by the experimental results.
Keywords :
AC-DC power convertors; power factor correction; power filters; AC-DC front-end power supply design; EMI filter size; asymmetrical phase angle control strategy; boost inductor; environmental concerns; light load efficiency; light load efficiency improvement; multichannel PFC; phase-shedding control; power supply industry; ripple cancellation effect; Electricity supply industry; Electromagnetic interference; Environmental economics; Filters; Inductors; Information technology; Interleaved codes; Lighting control; Power generation economics; Power supplies;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Electronics Specialists Conference, 2008. PESC 2008. IEEE
Conference_Location :
Rhodes
ISSN :
0275-9306
Print_ISBN :
978-1-4244-1667-7
Electronic_ISBN :
0275-9306
Type :
conf
DOI :
10.1109/PESC.2008.4592592
Filename :
4592592
Link To Document :
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