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| Improved Constant On-Time Control of Boundary Conduction Mode Boost Power Factor Correction Converter |
| Zhou Yuting, Wu Yu, Ren Xiaoyong, Chen Qianhong, Zhang Zhiliang |
| Jiangsu Key Laboratory of New Energy Generation and Power Conversion Nanjing University of Aeronautics and Astronautics Nanjing 211106 China |
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Abstract In order to obtain low input current total harmonic distortion (THD) of boundary conduction mode (BCM) Boost power factor correction (PFC) converter, an improved constant on-time (COT) control is proposed in this paper, and its influence on input current THD and efficiency is also analyzed. Furthermore, an improved zero-current-detection (ZCD) method is adopted to realize the early detection for ZCD signal. The influence of signal propagation delay is compensated, and the reverse resonance process is shortened or even eliminated, thereby improving the input current THD without increasing control complexity. Finally, an experimental prototype of a 160W BCM Boost PFC converter is established to verify the feasibility and effectiveness of improved COT control.
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Received: 03 July 2020
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2021, Vol. 36 
