一種低通態損耗PFC電路研究

摘要：　　本文給出了一種可用于功率因數校正的新型低通態損耗電路。通常的功率因數校正電路由二極管橋式整流電路和升壓式變換器組成。其缺陷是電路工作時，一直有三個半導體器件存在導通壓降。本文研究的電路，當升壓變換器功率管導通時，有三個半導體器件存在導通壓降；而當升壓變換器功率管關斷時，只有兩個半導體器件存在導通壓降。因此，提高了電路的工作效率。本文分析了這種電路的工作原理，并給出了仿真結果，證明了理論分析的正確性。 敘詞：通態損耗 功率因數校正 零電壓轉換 軟開關 Abstract：　　A novel low conduction loss circuit that can be used for power factor correction (PFC) is presented in this paper. A conventional PFC circuit is composed of diode bridge rectifier and boost converter circuits. The main drawback of the conventional PFC circuit is that when it operates, there are always three semiconductors conducting. The new circuit given in this paper there are three semiconductors conducting when the boost converter’s power switch is in the switch-on operation mode, there are only to semiconductors conducting when the boost converter’s power switch is in the switch-off operation mode. Thus the efficiency of the PFC circuit is improved. The basic principle of the novel PFC circuit is analyzed in detail and the simulation results are given. The theory analysis is testified by the simulation results. Keyword：Conduction Loss, Power Factor Correction (PFC), Zero voltage Transition (ZVT), Soft Switching.