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什么是二极管

贺拉斯-贺

最後更新:2023年12月26日

什么是二极管

二极管是一种半导体器件,它允许电流向一个方向流动,同时阻断电流向相反方向流动。它是一种双端电子元件,其正极称为 陽極 负极称为 陰極.当在二极管正向(阳极为正,阴极为负)施加电压时,二极管允许电流流过。但是,当电压反向施加时,二极管会阻断电流。

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在照明行业,二极管特指发光二极管(LED)。LED 是一种半导体器件,电流通过时会发光。它们由特定的半导体材料组成,通常是镓、砷和磷的组合,通电时发光。LED 发出的光的颜色取决于所使用的特定半导体材料和掺杂量。

LED 因其众多优点而在照明行业大受欢迎。它们具有很高的能效,能将更高比例的电能转化为光能,从而减少热能浪费。与传统光源相比,LED 的使用寿命更长、更耐用、体积更小巧,例如 白炽灯泡 和荧光灯。

从 Rayzeek 运动传感器产品组合中获得灵感。

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常見問題

LED 灯是否需要二极管

LED 照明的工作原理是电致发光,即利用半导体材料(二极管)产生光。当电流通过二极管时,它就会发出光子,从而使 LED 灯泡产生光。

什么是二极管与发光二极管

二极管负责将交流电转换成直流电,而发光二极管则将电压转换成光。此外,二极管的反向击穿电压较高,而 LED 的反向击穿电压较低。反向击穿电压是指允许电流在反向偏压下流动的电压。

LED 二极管是交流电还是直流电

LED 本身设计用于直流 (DC) 工作,只允许电流单向流动。它们通常由直流电压源供电,利用电阻器、电流调节器和电压调节器来控制和限制提供给 LED 的电压和电流。

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