Study and Implementation of two-Transformer Half-Bridge DC/DC Converter with a Secondary-Side Series Resonant Tank

• Main Authors: Che-Kang Liu, 劉哲綱
• Other Authors: Yu-Kang Lo
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/06873660756391299789

碩士 === 國立臺灣科技大學 === 電子工程系 === 101 === This thesis focuses on the study and implementation of a series resonant converter (SRC) with a secondary-side resonant tank. In general, an SRC with primary-side resonant tank is adopted for the applications with high input voltages and low output voltages. When it is applied on a system with a low input voltage and high output voltage, the equivalent output load reflected from the secondary to the primary will be very small. If the quality factor is designed to be low, the characteristic impedance, which is equal to the gain of the quality factor and the reflected output load, will also be small. This causes difficulty in designing the resonant tank elements. However, for an SRC with secondary-side resonant tank suitable for low input voltage and high output voltage applications, the transformer is difficult to design because the primary switch current is high. Alternatively, two transformers paralleled at the primary side feature inherent current sharing, can solve the heat problem. A laboratory prototype with 24-V input and 200-V output was built and tested to verify the feasibility of the proposed scheme, a commercial IC CM6900 with a simple auxiliary circuit was used to realize the studied control strategy. Tight voltage regulation can be achieved according to the experimental results.