An AC/DC PFC Converter with Active Soft Switching Technique

An AC/DC PFC Converter with Active Soft Switching Technique

S. Aiswariya (Syed Ammal Engineering College, Ramanathapuram, Tamil Nadu, India) and R. Dhanasekaran (Syed Ammal Engineering College, Ramanathapuram, Tamil Nadu, India)
Copyright: © 2014 |Pages: 21
DOI: 10.4018/ijeoe.2014070107
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This paper proposes an AC-DC converter with the application of active type soft switching techniques. Boost converter with active snubber is used to achieve power factor correction. Boost converter main switch uses Zero Voltage Transition switching for turn on and Zero Current Transition switching for turn off. The active snubber auxillary switch uses Zero Current Switching for both turn on and turn off. Since all the switches of the proposed circuit are soft switched, overall component stress has been greatly reduced and the output DC voltage is expected to have low ripples. A small amount of auxillary switch current is made to flow to the output side by the help of coupling inductor. The proposed circuit is simulated using MATLAB Simulink. All the related waveforms are shown for the reference. The power factor is measured as 0.99 showing that the input current and input voltage is in phase with each other. The PFC circuit has very less number of components with smaller size and can be controlled easily at a wide line and load range.
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Need For Power Factor Correction

Power factor is the ratio of real power to apparent power both measured in Watts. From the voltage and current waveforms it can also be inferred as the phase shift between them. Power factor correction is shaping the input current of AC main synchronized with input AC voltage increasing the rectifier’s conduction angle. This is done to increase the amount of real power from the mains and to remove the harmonics present in the input current (Ahmad Mousavi & Gerry Moschopoulos, 2014; Chongming Qiao & Keyue Ma Smedley,2001). In older days, inductors and capacitors were used with low EMI but with reduced efficiency and increased component stress (Mishra, Ramteke & Suryawanshi, 2012). A lower capacitance can be added to the output capacitor but it will create ripples at the output voltage. Many researches have been developed in the area of power factor correction during recent years since electronic equipment with PFC converters are necessary to meet the standard and regulations involving harmonics.

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