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本文讨论了功率因素校正、不间断供电的交-直流变换系统的研究现状，指出了对集功率因素校正。不间断供电、直流稳压为一体的UPPS（UninterruptedPower－factor－correctedPowerSupplies）进行深入研究的必要性和现实意义。
This paper discusses the research status of power factor correction and uninterrupted power supply AC-DC conversion system, and points out the correction of power factor. Uninterrupted power-factor-correctedPowerSupplies (UPS), the necessity and the practical significance of further research.