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一種低通態(tài)損耗PFC電路研究

摘要：　　本文給出了一種可用于功率因數(shù)校正的新型低通態(tài)損耗電路。通常的功率因數(shù)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(shí)，一直有三個(gè)半導(dǎo)體器件存在導(dǎo)通壓降。本文研究的電路，當(dāng)升壓變換器功率管導(dǎo)通時(shí)，有三個(gè)半導(dǎo)體器件存在導(dǎo)通壓降；而當(dāng)升壓變換器功率管關(guān)斷時(shí)，只有兩個(gè)半導(dǎo)體器件存在導(dǎo)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(jié)果，證明了理論分析的正確性。 敘詞：通態(tài)損耗 功率因數(shù)校正 零電壓轉(zhuǎn)換 軟開關(guān) 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.

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