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具有宽负载范围和低电压应力的三态反激PFC变换器

, PP. 123-130

Keywords: 反激变换器,伪连续导电模式,功率因数校正,三态,宽负载范围,低电压应力

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Abstract:

提出一种具有宽负载范围和低电压应力的三态反激功率因数校正(PFC)变换器拓扑。通过续流功率开关管和二极管,使该变换器工作于伪连续导电模式(PCCM),拓宽了传统不连续导电模式(DCM)反激PFC变换器的带载能力,并有效地降低了传统DCM反激PFC变换器中功率开关管所承受的电压应力。通过对电路工作模态及其稳态特性的分析可知,该变换器不仅具有较好的功率因数校正能力,还具有开关管电压应力低、负载范围宽等优点。最后,通过实验结果验证了该变换器的优越性。

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