A novel active‐clamp zero‐voltage‐switching buck‐boost converter |
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| Authors: | Pham Phu Hieu Yao‐Ching Hsieh Jing‐Yuan Lin Bing‐Siang Huang Huang‐Jen Chiu |
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| Affiliation: | 1. Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan;2. Department of Electrical Engineering, National Sun Yat‐sen University, Kaohsiung, Taiwan |
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| Abstract: | An active‐clamp zero‐voltage‐switching (ZVS) buck‐boost converter is proposed in this paper to improve the performance of converter in light load condition. By employing a small resonant inductor, the ZVS range of switches could be adjusted to very light load condition. Moreover, 2 clamping capacitors are added in the converter to eliminate the voltage spike on the switches during transition. The operating principle of the proposed converter is analyzed, and the optimal design guide for full range ZVS is also provided. A 60‐W output prototype is experimentally built and tested in laboratory to verify the feasibility of proposed converter. The measured results show the critical ZVS operation of power switches at 1 and 0.7‐W output power for buck and boost mode, respectively. The peak conversion efficiency is up to 92.3%. |
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| Keywords: | buck‐boost converter duty loss zero‐voltage switching |
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