桥式整流中，如果有一只二极管被击穿，会出现什么现象？桥式整流电路中如果有一个二极管接反了,则会出现-森宝五金网

　　桥式整流在直流电源电路中，起到把交流电转变为(脉动)直流电的作用。四个二极管接成一个正方形，两个二极管正负连接点作为交流输入端，两个二极管正端连接点为直流输出端+，两个二极管负端连接点为直流输出端-。

　　二极管有单向导电性，在桥式整流中，交流正半周，整流桥的二极管D1，D4导通，负半周二极管D3，D2导通，同一时间内只有两个二极管工作在导通状态，另两个截止。

　　假如桥式整流的一个二极管发生短路，电源系统即造成短路。比如图纸的D1短路了，在通电瞬间，交流输入的正半周D1D4导通(D1短路相当于导通)，电流由D1经过负载流到D4，电路正常。在交流输入的负半周，电流应该由D3再流过D2，由于D1短路，D3的电流直接由短路的D1回到交流输入端，此时就发生了严重的短路。

　　短路造成大电流，首先会烧掉交流保险丝或保险电阻FU，若保险失效，会烧掉变压器。由以上分析可知，一个二极管短路，会造成桥臂另个二极管流过短路电流，因此图中的D3也可能损坏。现实中，桥整常常损坏两个二极管。

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　　有一只短路，第二只二极管跟着烧坏短路，变压器严重发热一会儿断路器跳闸。

　　整流二极管击穿就是短路了！有保险丝或者保险电阻的立马炸保险丝和保险电阻，没有保险丝和保险电阻的直接跳闸！这种故障属于硬故障，简单明了。

桥式整流中，如果有一只二极管被击穿，会出现什么现象？桥式整流电路中如果有一个二极管接反了,则会出现