Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 22, Issue 4, Pages 1352-1360Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2007.900591
Keywords
compensation strategy; dual loads; four-switch half-bridge (HB) boost rectifier; output voltage imbalance; single load
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In this paper, a four-switch voltage-doubler boost rectifier is analyzed. A new control scheme is proposed to eliminate the output voltage imbalance when the load is unevenly distributed across the two output dc rails. Unipolar pulsewidth modulation switching patterns are adopted to slow down the discharging rate of the output capacitor with the lower voltage. No dc or out-of-phase component is injected in the source current. Thus, the unity input power factor can be genuinely achieved. Two hysteresis comparators are employed in the presented controller. One is used for the source current to track its command. The other comparator is to confine the output voltage imbalance within a reasonable level. Modified averaged circuit models are adopted to derive the limits of the ratio of the dual loads for output voltage balance. Experimental results on prototype circuits confirm tightly with the theoretical analysis.
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