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FRD（快速恢复二极管）
下载“第Ⅱ章：二极管” (PDF:895KB)
快速恢复二极管的结构和功能与整流二极管相同。整流二极管用于500Hz以下的低频应用，而FRD则用于从几千赫兹到100kHz的高频开关。因此，二极管具有反向恢复时间（trr）很短的特性，这对高速开关非常重要。根据trr值，FRD也称为S-FRD、HED等。
一般整流二极管的trr为几微秒到几十微秒。另一方面，FRD的trr是几十毫微秒到几百毫微秒，约为整流二极管的1/100。它应用于开关电源、逆变器、DC/DC转换器等。
图2-3（a）二极管开关波形和损耗实例
图2-3（b）通用整流器与FRD的trr比较
当频率较低时，由trr引起的损耗（反向恢复损耗）可以忽略不计，但这种损耗会随着频率的增加而增加，当频率变为几千赫兹或更高时，则损耗不能忽略。
