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| A Method of Reducing Storage Capacitor of DCM Boost PFC Converter |
| Yao Kai1, Ruan Xinbo1, Mao Xiaojing1, Ye Zhihong2 |
| 1. Nanjing University of Aeronautics and Astronautics Nanjing 210016 China 2. Lite-on Technology Corp. Nanjing 210019 China |
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Abstract The input current of DCM Boost PFC converter contains 3rd harmonic which has an initial phase difference of π with fundamental harmonic, this results in low PF and large electrolytic capacitor. Injecting appropriate 3rd harmonic which is in phase with fundamental component into the input current is proposed in the paper. The proposed method achieves storage capacitor reduction of 63% and 57% over the constant duty cycle control, when the harmonic specification of IEC 61000-3-2 Class D or Energy Star is met respectively. A method of fitting the duty cycle is further proposed for simplifying the circuit implementation. The experimental results from a 120W universal input prototype are given to verify the effectiveness of the proposed method.
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Received: 03 November 2010
Published: 19 March 2014
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2012, Vol. 27 
