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A Study on Switching Characteristics of Active Clamp Type Flyback Converter with Synchronous Rectifier Driving Signals Controlling Auxiliary Switch  

Ahn, Tae Young (Department of Electronic Engineering, Cheongju University)
Publication Information
Journal of the Semiconductor & Display Technology / v.17, no.3, 2018 , pp. 21-26 More about this Journal
Abstract
In this paper, the switching characteristics of the active clamp type flyback converter, which is deemed suitable for the miniaturization of the external power supply for home appliance, were analyzed and the process of reducing the switching loss was explained. The active clamp type flyback converter operating in the DCM has confirmed that the surge voltage of the main switch does not occur and the turn-off / on loss of the switch do not occur in principle. Also, in the case of the switch for synchronous rectifier, it was showed that the switch current showed half-wave rectified sinusoidal characteristic, and the switching loss was reduced. The switching characteristics of the experimental results gathered from 120 W class prototype were compared with the theoretical waveform in the steady-state and it was confirmed that the power conversion efficiency of the active clamp type flyback converter was maintained high due to the reduction of the switching loss.
Keywords
Active clamp snubber; Quasi resonant switching; Valley switching; Flyback converter; Synchronous rectifier;
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  • Reference
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