IBS PCI SC/I-T IBS PCI SC/I-T
IBS PCI SC/I-T IBS PCI SC/I-T
開關電源工作原理
開關電源電路圖如圖2所示。
1 交流電源輸入電路
220V或60V交流電通過保險絲F和熱敏電阻RT加到由L1、L2、L3、C1-C5組成的電源濾波器,可有效地把市電網(wǎng)中的高頻成份濾除掉,防止外來高頻干擾波進入開關電源。同時也抑制開關電源產(chǎn)生的高頻波,以防止串入市電網(wǎng)。R1為避雷器,當遭雷擊時將被擊穿短路、保險絲將熔斷,保護開關電源各器件不被擊損。RT熱敏電阻的特性是冷電阻小、熱電阻大,當由某種原因輸入電流增大時,熱敏電阻發(fā)熱阻值變大,阻止大電流進入開關電源電路中。
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★四菜一湯:AB 1785、1756、1747、1784,施耐德140系列,發(fā)那科A06B系列,西門子6ES,505系列熱賣!
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