DocumentCode
3679911
Title
A novel driving scheme for synchronous rectifier in MHz CRM flyback converter with GaN devices
Author
Xiucheng Huang;Weijing Du;Fred C. Lee;Qiang Li
Author_Institution
Center for Power Electronics Systems, the Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, USA
fYear
2015
Firstpage
5089
Lastpage
5095
Abstract
Synchronous rectifier (SR) is widely used in flyback converter to reduce the output side conduction loss in order to meet the system conversion efficiency requirement. The conventional SR driving methods are not suitable for high frequency (>500kHz) application. This paper proposes a novel SR driving method for MHz flyback converter operating at critical conduction mode (CRM). A RC network is in parallel with SR to emulate the magnetizing current of flyback converter. The sensing signal is clean and immune to the parasitic ringing caused by the leakage inductance and parasitic capacitors. SR gate signal is accurately generated based on a simple signal processing circuit and the conduction loss of SR body diode is minimized. The theoretical analysis is validated by simulation and experiment.
Keywords
"Switches","Capacitors","Sensors","Magnetic tunneling","Oscillators","Inductors","Inductance"
Publisher
ieee
Conference_Titel
Energy Conversion Congress and Exposition (ECCE), 2015 IEEE
ISSN
2329-3721
Electronic_ISBN
2329-3748
Type
conf
DOI
10.1109/ECCE.2015.7310377
Filename
7310377
Link To Document