壓敏電阻與PTC熱敏電阻配合使用

摘要：壓敏電阻與PTC熱敏電阻配合使用，利用壓敏電阻過電壓時產生的電流和溫度使熱敏電阻響應迅速，利用熱敏電阻阻值上升對電壓和電流的影響,反過來對壓敏電阻進行保護，從而組成電源的保護電路。本文綜述了在熒光燈預熱啟動、電能儀表、LED驅動電源、通信保安單元等中的應用。 敘詞：壓敏電阻 PTC熱敏電阻 配合使用 Abstract：The varistor is used in conjunction with the PTC thermistor. The current and temperature produced by the over-voltage of the varistor makes the thermistor response promptly. In return, the influence of the increasing resistance of the thermistor on voltage and current can protect the varistor. As a result, powers protective circuit is formed. This paper analyzes its application in preheating start of fluorescent lamp, power meter, LED-driven power, communication security unit. Keyword：Varistor, PTC thermistor, Used in conjunction