摘要：開關(guān)電源保護(hù)電路關(guān)系到電源的安全性和可靠性。本文較系統(tǒng)地研究了開關(guān)電源的防浪涌電流的軟啟動，防過壓、欠壓、過熱、過流、短路、缺相等保護(hù)電路。并研究各種保護(hù)電路的綜合應(yīng)用及其注意事項(xiàng)。為開關(guān)電源的設(shè)計和保障開關(guān)電源安全可靠工作提供了經(jīng)驗(yàn)。 敘詞：開關(guān)電源；保護(hù)電路；安全性；可靠性 Abstract：Safeguard circuit in switches power supply is of vital importance to the safety and reliability of source. It is researched that surge current、over voltage、owe voltage、over heat、over current、short circuit、off phase safeguard circuit etc in switches power supply.
Multipurpose use and matters needing attention of each safeguard circuit is researched too. The
experience is provided for deign and safety work of switches power supply. Keyword：Switches power supply；Safeguard circuit；Safety；Reliability