Adjustable Phase-Shifted Full-Bridge Power Supply with Fully Digital Controller

• Main Authors: Ching-hao Haung, 黃清豪
• Other Authors: Chang-hua Lin
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/35294343369567073143

碩士 === 大同大學 === 電機工程學系(所) === 101 === In this thesis, a phase-shifted full-bridge power supply with continuously adjustable function by interpolating a fully digital controller is proposed. The proposed controller can stabilize the output voltage instead of fluctuant voltage using traditional controller while the output voltage is modulated in a wide range. In addition, the proposed system can achieve ZVS under various load conditions, and does not need to replace the component of controller. First, all the mathematical models of each operating state is derived, to obtain the corresponding relationship among the angle of phase-shifted, output voltage and output current. And then the complete design considerations are provided on detail. Next, the output voltage feedback control is conducted to achieve the preset output voltage by varying the angle of the phase-shifted according to the sampling output voltage and the parameters entered by the user interface, including the required voltage and current. Finally, the system efficiency is up to 92.4% at full load. The measured experiments are close to the simulation results under all test conditions, and the practical output voltage also coincides with the theoretical prediction.