Abstract—Conventional
power factor correction (PFC) singleended primary inductor converter (SEPIC)
suffers from high conduction loss at the input bridge diode. To solve this
problem, a bridgeless SEPIC converter with ripple-free input current is
proposed. In the proposed converter, the input bridge diode is removed and the
conduction loss is reduced. In addition, the input current ripple is significantly
reduced by utilizing an additional winding of the input inductor and an
auxiliary capacitor. Similar to the conventional PFC SEPIC converter, the input
current in a switching period is proportional to the input voltage and near
unity power is achieved. The operational principles, steady-state analysis, and
design equations of the proposed converter are described in detail.
Experimental results from a 130Wprototype at a constant switching frequency of
100 kHz are presented to verify the performance of the proposed converter.
(Index
Terms—Bridgeless converter, coupled inductor, power factor correction (PFC),
single-ended primary inductor converter (SEPIC).)
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