| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 102 === Asymmetrical half-bridge flyback converter (AHB-flyback) is attractive because of its simplicity of secondary side configuration, and low voltage stress. It can achieve high efficiency by using soft switching techniques, such as the zero-voltage switching (ZVS) of primary power switches and the zero-current switching (ZCS) of output rectifiers. These characteristics make it suitable for high frequency and high input voltage power conversion applications. However, this converter has pulsating input current resulting in generating high di/dt noise. To reduce the pulsating input current ripple, an Input Current Ripple Reduction Asymmetrical Half Bridge flyback converter (RR-AHB-flyback) is proposed in this thesis.
In addition to inheriting the advantages of AHB-flyback converter, RR-AHB-flyback has significantly reduces input current ripple due to its built-in current ripple cancellation mechanism. Furthermore, the coupled inductor is used to achieve high power density and wide ZVS range.
Operation principles and circuit design are shown in this thesis. Both of AHB-flyback and RR-AHB-flyback are experimented under 100 kHz, 300-400 V input and 24V/10A output to demonstrate its feasibility.
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