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阐明了有源功率因数校正技术(PFC)对改善电能质量的重要意义。分析了三相电容输入降压式准谐振PFC的工作原理。运用单相时变简化模型推导了电路各参量间的关系,获得并绘制了实用电路设计特性曲线,为PFC的设计提供了理论依据。仿真结果表明,准谐振PFC实现了零电流切换,且动态特性好,负载范围宽,解决了PFC装置化存在的问题。准谐振PFC的功率传输品质因数在0.98 以上,电流总谐波畸变率小于5% 。
Clarified the significance of active power factor correction (PFC) to improve power quality. The working principle of three-phase capacitor input quasi-resonant PFC is analyzed. The single-phase time-varying simplified model is used to derive the relationship among the various parameters of the circuit. The practical circuit design characteristic curve is obtained and drawn, which provides a theoretical basis for the design of PFC. The simulation results show that quasi-resonant PFC achieves zero-current switching with good dynamic characteristics and wide load range, which solves the problems of PFC device. Quasi-resonant PFC power transmission quality factor above 0.98, current total harmonic distortion rate of less than 5%.