Title :
Adaptive off-time control for variable-frequency, soft-switched flyback converter at light loads
Author :
Y. Panov;M.M. Jovanovic
Author_Institution :
Power Electron. Lab., Delta Products Corp., Research Triangle Park, NC, USA
Abstract :
The soft switching of a flyback converter can be achieved by operating the circuit in the critical conduction mode. However, the critical-mode operation at light loads cannot be maintained due to a very high switching frequency and the loss of the output voltage regulation. A control which regulates the output down to the zero load and maintains soft switching at light loads is proposed. The proposed control scheme was implemented in the 380 V/19 V, 65 W flyback DC/DC converter.
Keywords :
"Programmable control","Adaptive control","Lighting control","Switching converters","Voltage control","Power semiconductor switches","Detectors","Frequency","Latches","Magnetic switching"
Journal_Title :
IEEE Transactions on Power Electronics
DOI :
10.1109/TPEL.2002.800958
