雷电冲击是造成过应力最普遍的原因。一些消费电子设备,例如机顶盒和DVD播放器,通常都会含有调谐接收器。当交流电源线或者天线受到雷击时,雷电冲击就会通过这些通路在设备内部产生过电压或者过电流现象。本文向开关电源(SMPS)电路的设计者提供一些建议,指导如何恰当地设计SMPS以避免由雷击造成的故障或者破坏。 Lightning impulse is the most common cause of stress. Some consumer electronic devices, such as set-top boxes and DVD players, usually contain tuning receivers. When the AC power cord or antenna is struck by lightning, lightning impulses will cause overvoltage or overcurrent in the equipment through these paths. This article gives designers of switched mode power supply (SMPS) circuits advice on how to properly design SMPS to avoid malfunctions or damage caused by lightning strikes.