品牌
经销商厂商性质
厦门市所在地
IBS PCI SC/I-T IBS PCI SC/I-T
IBS PCI SC/I-T IBS PCI SC/I-T
开关电源工作原理
开关电源电路图如图2所示。
1 交流电源输入电路
220V或60V交流电通过保险丝F和热敏电阻RT加到由L1、L2、L3、C1-C5组成的电源滤波器,可有效地把市电网中的高频成份滤除掉,防止外来高频干扰波进入开关电源。同时也抑制开关电源产生的高频波,以防止串入市电网。R1为避雷器,当遭雷击时将被击穿短路、保险丝将熔断,保护开关电源各器件不被击损。RT热敏电阻的特性是冷电阻小、热电阻大,当由某种原因输入电流增大时,热敏电阻发热阻值变大,阻止大电流进入开关电源电路中。
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