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Adaptive off-time control for variable-frequency, soft-switched flyback converter at light loads

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2 Author(s)
Panov, Y. ; Power Electron. Lab., Delta Products Corp., Research Triangle Park, NC, USA ; Jovanovic, M.M.

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

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Power Electronics, IEEE Transactions on  (Volume:17 ,  Issue: 4 )