A Novel Control Strategy for High Efficient SSPFC Topology
Sakkeer Hussain C.K1, R. Muthukumar2, A. Rathnam3
1Sakkeer Hussain C.K, Department of Electrical and Electronics Engineering,  Paachal, Namakkal, India.
2R. Muthukumar, Asst. Professor, Department of Electrical and Electronics Engineering, , Paachal, Namakkal, India.
3A. Rathnam, Asst. Professor, Department of Electrical and Electronics Engineering, , Paachal, Namakkal, India.
Manuscript received on January 29, 2013. | Revised Manuscript received on February 16, 2013. | Manuscript published on February 28, 2013. | PP: 328-334 | Volume-2 Issue-3, February 2013.  | Retrieval Number: C1122022313/2013©BEIESP

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Abstract: The conventional SSPFC (single-stage power factor correction) converters suffer from low efficiency because of high voltage and current stresses acting on switching devices and other circuit parameters. The introduction of resonant converters along with the conventional SSPFC provides a very sensible solution for the above mentioned problem. Since this resonant SSPFC converter operation carried out with variable frequency, it provides an efficient operation only at full load. Below full load, the operation results in efficiency drop due to the shift from resonant frequency. A load dependent strategy helps in maintaining the efficiency level as constant even below full load. Two variables are to be controlled in this circuit, which are resonant frequency and duty ratio. Normally two controllers are essential to perform the operation which cause increased cost and requires more processing time. This paper proposes a single PI controller to control the both variables to provide high converter efficiency and to reduce the cost and the processing time. The proposed system provides a constant efficiency in conversion process up to 50% of full load current. The MATLAB simulation is presented to verify the performance analysis.
Keywords: AC/DC converters, power factor correction converters, PI controller, resonant converter.