摘要：本文介紹了工頻機(jī)與高頻機(jī)UPS的主電路結(jié)構(gòu)，指出了工頻變壓器的基本功能是變壓和產(chǎn)生零點(diǎn)，并不抗干擾和緩沖。并介紹了電子變壓器的優(yōu)點(diǎn)，指出了高頻機(jī)最終要代替工頻機(jī)的必然趨勢(shì)。 敘詞：工頻 高頻 干擾 緩沖 隔離變壓器 電子變壓器 Abstract：The paper introduced the UPS main circuits of the industrial frequency and high frequency.Pointed out industrial frequency transformer functions are converting voltage and producing nature point and it cannot avoid interferes or is not buffer.Introducing the benefits of electronic transformer and pointing out the direction of high frequency UPS replace industrial frequency one . Keyword：industrial frequency high frequency interfere buffer insulating transformer