Title :
A CCM/DCM Dual-Mode Synchronous Rectification Controller for a High-Efficiency Flyback Converter
Author :
Jeongpyo Park ; Yong-seong Roh ; Young-jin Moon ; Changsik Yoo
Author_Institution :
Dept. of Electron. Eng., Hanyang Univ., Seoul, South Korea
Abstract :
A dual-mode synchronous rectification (SR) controller supporting both the continuous-conduction mode and discontinuous-conduction mode is developed to improve the power efficiency of a flyback converter. The dual-mode SR controller ensures nonoverlapped turning-on of the primary and secondary switches by monitoring the voltage level of the secondary switch. The dual-mode SR controller requiring four pins and only one external resistor has been implemented in a 0.35-μm BCDMOS process and applied to a 50-W flyback converter. The efficiency of the flyback converter is improved by upto 6.8% when the dual-mode SR controller is employed compared to the one employing the conventional SR controller.
Keywords :
BIMOS integrated circuits; switches; switching convertors; BCDMOS process; CCM-DCM dual-mode synchronous rectification controller; continuous-conduction mode; discontinuous-conduction mode; dual-mode SR controller; high-efficiency flyback converter; power 50 W; primary switches; secondary switch; secondary switches; size 0.35 mum; voltage level monitoring; Clocks; Control systems; Resistors; Sensors; Switching circuits; Transistors; Voltage control; Continuous-conduction mode (CCM); discontinuous-conduction mode (DCM); flyback converter; synchronous rectification;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2013.2256371
