The Realization Study of Modular Phase-Shifted Zero-Voltage-Switching Full-Bridge Converter

• Main Authors: Chuang Chei Cheng, 莊志成
• Other Authors: G. C. Hsieh
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/79644474761723795900

碩士 === 國立臺灣科技大學 === 電子工程系 === 87 === Abstract This thesis presents a strategy for realizing a medium-power module AC/DC converter by zero-voltage-switching pulse-width modulation (ZVS-PWM) technique. A full-bridge topology is employed and a voltage-mode control is adopted to acquire good voltage regulation. The valid duty and the sub-duty intervals in the full-bridge loop are exactly estimated. The complete primary current profile with respect to each transition interval of the phase-shift process is derived and modeled. A master-slave active current sharing technique is used as the modulus parallel strategy in the design. A complete small-signal flow chart and inner transfer function of the master and slave module converter is derived. A design example for simulating and realizing a power supply with 4+1 modules of total power 3.75kW (single module’s output is 24V~30V/25A) FB-PS-ZVS-PWM converter including output voltage adjustment and parallel load current sharing is conducted to assess the system performance and to verify the theoretical predictions.