Study and Implementation of Asymmetrical Half-Bridge Forward Resonant Converter

• Main Authors: Yu-Fu Chen, 陳裕夫
• Other Authors: Huang-Jen Chic
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/29206529313047032700

碩士 === 國立臺灣科技大學 === 電子工程系 === 104 === This thesis proposes an asymmetrical half-bridge forward resonant converter, which applies the so-called of a “hybrid-switching” technique on the converter to increase the range of zero-voltage-switching (ZVS), and the zero-current-switching (ZCS) on output diode. The magnetic hysteresis loop of a half-bridge converter can transverse over both the first and the third quadrants; therefore the magnetic components can be fully utilized. An asymmetrical half-bridge converter has the following advantages: simple structure, lower switch voltage rating, ZVS features and therefore suitable for low power applications. This thesis presents an asymmetrical half-bridge forward resonant converter without output inductor. The secondary-side Schottky diode is replaced by a synchronous rectification power MOSFETs to reduce the conduction loss and improve the power efficiency. The operating principle of the proposed converter has been analyzed, described and discussed in detail. The simulations using SIMPLIS are performed and used for circuit design. A wide input range 90 ~264 Vacin and an output of 19 V/65 W converter is implemented to verify the proposed converter scheme, which applies adapter.