快恢复二极管在高频电路中的选型应用

Selection and Application of Fast Recovery Diodes in High Frequency Circuits

快恢复二极管是电源电路中不可或缺的重要器件,但是选型不当会产生器件过热及线路的电磁兼容(EMC)问题。本文从快恢复二极管的基本特性及主要参数入手,分析它们的工作状态,提出选用的依据、原则。根据不同工作频率选用适当开关时间的快恢复二极管,同时注意恢复曲线的速率,降低线路电磁震荡。提出的选型方法能够有效避免二极管热击穿以及线路的EMC问题。

The fast recovery diode is an indispensable and important device in the power supply circuit.Improper selection will cause overheating of the device and electromagnetic compatibility (EMC) problems of the circuit.Starting from the basic characteristics and main parameters of fast recovery diodes,analyze their working states and put forward the basis and principles for selection.Select fast recovery diodes with appropriate switching time according to different operating frequencies,and pay attention to the speed of the recovery curve to avoid electromagnetic oscillation of the line.The proposed selection method can effectively avoid the thermal breakdown of the diode and the EMC problem of the circuit.