| Summary: | 碩士 === 國立雲林科技大學 === 電機工程系碩士班 === 100 === This thesis presents a synchronous dual-switch quasi-resonant converter with high input voltage. In the dual-switch flyback converter, the switch voltage is clamped at the input voltage by the clamp diode and, the device stress can be effectively reduced. The energy in leakage inductor can be returned to the input source by the clamp diode. Thus, no snubber circuit is needed. In the control PWM, switches are all discontinuous conduction mode (DCM). The quasi-resonant pwm technique is used to detect the valley switching. Thus, switching loss and electromagnetic interference are reduced. The synchronous rectifiers are also used at the secondary side of transformers to reduce the conduction loss. Finally, the measured results are presented to confirm the effectiveness of the proposed converter.
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