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A Single-Stage AC/DC Converter With High Power Factor, Regulated Bus Voltage, and Output Voltage

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3 Author(s)
Lu, D.D.-C. ; Sydney Univ., Sydney ; Iu, H.H.-C. ; Pjevalica, V.

Unlike existing single-stage AC/DC converters with uncontrolled intermediate bus voltage, a new single-stage AC/DC converter achieving power factor correction (PFC), intermediate bus voltage output regulation, and output voltage regulation is proposed. The converter is formed by integrating a boost PFC converter with a two-switch clamped flyback converter into a single power stage circuit. The current stress of the main power switch is reduced due to separated conduction period of the two source currents flowing through the power switch. A dual-loop current mode controller is proposed to achieve PFC, and ensure independent bus voltage and output voltage regulations. Experimental results on a 24-V/100-W hardware prototype are given to confirm the theoretical analysis and performance of the proposed converter.

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Power Electronics, IEEE Transactions on  (Volume:23 ,  Issue: 1 )