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A single stage soft-switchedAC/DC power factorcorrected converter withgalvanic isolation
Zhi Zhang1a), Xueliang Liu1, and Zhiping Wang21 School of Electronic Engineering, Dongguan University of Technology,
Dongguan 523808, China2 Guangdong Institute of Automation, Guangzhou 510007, China
Abstract: This paper describes a single-stage AC/DC Power Factor Cor-
rection (PFC) converter with galvanic isolation, and an active-clamp circuit
is used to achieve zero-voltage-switching (ZVS) for both main and auxiliary
switches. The ZVS operation principle of the system is illustrated in detail.
Simulation and experimental results based on a 85 kHz, 3000W prototype
circuit show that the proposed converter has low component count, galvanic
isolation, simple control, high power factor and high conversion efficiency in
a wide load range.
Keywords: power factor correction, zero-voltage-switching, isolation
Classification: Power devices and circuits
References
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[7] S. W. Lee and H. L. Do: “Single-stage bridgeless AC-DC PFC converter usinga lossless passive snubber and valley switching,” IEEE Trans. Ind. Electron. 63(2016) 6055 (DOI: 10.1109/TIE.2016.2577622).
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1 Introduction
Isolated AC/DC converters are used in many applications, such as PC’s and
consumer electronics, uninterruptible power supplies, telecommunication power
At t0, the main switch Q1 is turned on, and the auxiliary switch Q2 is turned off.
The input inductor L is being linearly charged, the parasitic capacitor voltage
ucr ¼ udsQ1 ¼ 0, and the resonant inductor current iLr discharge the capacitor Cp.
The diode D2 and D3 are turned on. The capacitor current ics increase and capacitor
voltage ucs decrease.
Mode 2
At t1, main switch Q1 is turned off, and the auxiliary switch Q2 is off, Cr is
charged by the input inductor current iL and resonant current iLr from 0 to uc(udsQ1 ¼ ucr ¼ uc) until time t ¼ t2, the charge time is very short, and the input
inductor iL and resonant current iLr are almost constant.
Fig. 3. Operation stages of proposed isolated converter