Design of high efficiency Flyback converter with energy regenerative snubber

The flyback converter is frequently used for multiple outputs and low power application due to its simplicity and both step-up and step-down characteristics. However, the high leakage inductance of the flyback transformer can causes high voltage spike and could damage the main transistor when the switch is turned off. Therefore, a turn-off snubber is needed to limit the peak voltage stress. In this paper, some common snubbers are discussed in comparison with the energy regenerative snubber. The operation of the energy regenerative snubber is analyzed and the design procedures are optimized for energy efficiency followed by experimental verification.