How to test the rectifier bridge is good or bad?

How to test the rectifier bridge is good or bad?

With a digital multimeter diode file or pointer table 100 or 1000 files, measure the two AC input to the output of the rectifier bridge resistance, if it is an open circuit or short circuit that the rectifier bridge has been bad. The normal value should be 400 to 2000 ohms.

Normal, the full bridge of the two AC input ("~") forward and reverse resistance are infinity; "+" "-" input forward resistance value of infinity, reverse resistance value (red pen connected to "+", black pen connected to "-" end) is about 20K.

Assuming that the digital multimeter (diode) file check, the red pen connected to the "-", the black pen connected to the "+" for 0.8; connected to the two "~" are about 0.4, the red pen connected to the "+", the black pen connected to the other three feet must be infinity, otherwise it is damaged rectifier.

Rectifier full bridge consists of four diodes, there are four pins: two diodes negative connection point is the full bridge DC output "positive", two diodes positive connection point is the full bridge DC output "negative".

Half bridge consists of two diodes, there are three pins. Positive half bridge on both sides of the pin is the positive terminal of the two diodes, that is, the AC input; the middle pin is the negative terminal of the two diodes, that is, the DC output "positive". Negative half bridge on both sides of the pin on the negative terminal of the two diodes, that is, the AC input; middle pin is the positive terminal of the two diodes, that is, the DC output "negative".

怎样测试整流桥的好坏？

用数字万用表的二极管档或指针表的100或1000档，测量两交流输入端到整流桥输出正端的阻值，若为开路或短路说明整流桥已坏。正常值应为400到2000欧姆。

正常时,全桥的两交流输入端("~")的正反向电阻均为无穷大；"+""-"输入端的正向阻值为无穷大,反向阻值(红表笔接"+",黑表笔接"-"端)约为20K。

假设用数字万用表(二极管)档检查,红表笔接"-',黑表笔接"+'为0.8;接两个"~"都为0.4左右，红表笔接"+',黑表笔接其它三脚必须为无穷大,否则就是损坏的整流。

整流全桥由四只二极管组成，有四个引出脚：两只二极管负极的连接点是全桥直流输出端的“正极”，两只二极管正极的连接点是全桥直流输出端的“负极”。

半桥由两只二极管组成，有三个引出脚。正半桥两边的管脚是两个二极管的正极，即交流输入端；中间管脚是两个二极管的负极，即直流输出端的“正极”。负半桥两边的管脚上两个二极管的负极，即交流输入端；中间管脚是两个二极管的正极，即直流输出端的“负极”。