DocumentCode :
708274
Title :
GaN-based high frequency totem-pole bridgeless PFC design with digital implementation
Author :
Lingxiao Xue ; Zhiyu Shen ; Boroyevich, Dushan ; Mattavelli, Paolo
Author_Institution :
Center for Power Electron. Syst., Virginia Tech, Blacksburg, VA, USA
fYear :
2015
fDate :
15-19 March 2015
Firstpage :
759
Lastpage :
766
Abstract :
Totem-pole bridgeless PFC is a very promising topology for GaN devices because of very low reverse recovery. However, inherent challenges exist for this topology at zerocrossing point of AC voltage where inductor, current spike is observed which may cause higher harmonics and EMI issue. This paper looks deeply into this phenomena and found two main causes: the transition delay of low frequency leg and the minimum pulse width limit of high frequency leg. A DSP-based digital modulator is designed to address those two issues by applying lead time to the low frequency leg and digital dithering to increase equivalent resolution at the high frequency leg. Some other rules are also summarized to enable robust modulator design, which is the main challenge in this topology. A 500 kHz GaN totem-pole bridgeless PFC converter operating in continuous conduction mode verified the effectiveness of those methods to eliminate the current spike at zero-crossing. All those findings will help the implementation of wide band gap devices in very high frequency PFC circuit.
Keywords :
electromagnetic interference; gallium compounds; inductors; modulators; power factor correction; AC voltage; DSP-based digital modulator; EMI issue; GaN; continuous conduction mode; digital dithering; digital implementation; high frequency PFC circuit; high frequency totem-pole bridgeless PFC design; inductor; totem-pole bridgeless PFC; totem-pole bridgeless PFC converter; wide band gap devices; Delays; Frequency modulation; Inductors; Logic gates; Switches; Time-frequency analysis; Bi-Directional; GaN; Modulator; Power Factor Correction; Totem-Pole Bridgeless; Zero-Crossing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2015 IEEE
Conference_Location :
Charlotte, NC
Type :
conf
DOI :
10.1109/APEC.2015.7104435
Filename :
7104435
Link To Document :
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