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Low cost power factor correction (PFC) converter using delay control

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2 Author(s)
Lee, K.C. ; Dept. of Electr. Eng., Seoul Nat. Univ., South Korea ; Cho, B.H.

A low cost universal input voltage (90~264 V) power factor correction (PFC) converter for a 200 W power supply in a personal computer (PC) is proposed. It consists of the PFC part followed by a DC-DC power converter as in a conventional two-stage scheme. However a single PWM controller is used as in a single-stage, single-switch PFC scheme. The switch in the PFC part is synchronized with the switch in the DC-DC power converter and it has a fixed frequency. Employing a simple delay scheme using the pulse and feedback signal of the DC-DC power converter, the PFC switch is controlled to limit the capacitor voltage within a range for the optimum efficiency and cost. A tradeoff study shows that it indeed offers better efficiency and cost reduction compared to single switch approaches for this power level. The design procedure and experimental results are presented

Published in:

Power Conversion Conference - Nagaoka 1997., Proceedings of the  (Volume:1 )

Date of Conference:

3-6 Aug 1997