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Maintenance skills of Jinan converter switching power supply
在变频器维修中，经常会碰到开关电源的故障问题，我们可以选择断电情况下，用“看、闻、问、量”来判断故障的具体情况看：打开电源的外壳，检查保险丝是否熔断，再观察电源的内部情况，如果发现电源的PCB板上有烧焦处或元件破裂，则应重点检查此处元件及相关电路元件。
In the maintenance of frequency converter, we often encounter the problem of switching power supply failure. We can choose to use "look, smell, ask and measure" to judge the specific situation of the failure: open the power supply shell, check whether the fuse is broken, and then observe the internal situation of the power supply. If the PCB of the power supply is found to be burnt or the components are broken, we should focus on the components here. And related circuit components.
闻：闻一下电源内部是否有糊味，检查是否有烧焦的元器件。
Smell: smell the inside of the power supply to see if there is any burning element.
问：问一下电源损坏的经过，是否对电源进行违规操作。
Q: ask about the process of power supply damage and whether the power supply is operated in violation of regulations.
量：没通电前，用万用表量一下高压电容两端的电压先。如果是开关电源不起振或开关管开路引起的故障，则大多数情况下，高压滤波电容两端的电压未泄放悼，此电压有300多伏，需小心。用万用表测量AC电源线两端的正反向电阻及电容器充电情况，电阻值不应过低，否则电源内部可能存在短路。电容器应能充放电。
Quantity: before power failure, use a multimeter to measure the voltage at both ends of the high-voltage capacitor. If the switch power supply fails to vibrate or the switch tube is open circuit, in most cases, the voltage at both ends of the high-voltage filter capacitor is not discharged. This voltage is more than 300 volts, so be careful. Use a multimeter to measure the positive and negative resistance at both ends of the AC power line and the charging condition of the capacitor. The resistance value should not be too low, otherwise there may be a short circuit inside the power supply. The capacitor shall be able to charge and discharge.
变频器开关电源维修技巧、开关电源出现不启振的时候，我们通常需要查看开关频率是否正确、保护电路是否封锁、电压反馈电路、电流反馈电路又没问题，开关管是否击穿等。
When the frequency converter switching power supply maintenance skills, switching power supply does not start, we usually need to check whether the switching frequency is correct, whether the protection circuit is blocked, voltage feedback circuit, current feedback circuit is no problem, whether the switch breaks down, and so on.
开关电源变压器发热或发出“嗞嗞嗞”声，一般是开关频率不对。
The transformer of switching power supply is heated or makes a "Ho Ho" sound, generally the switching frequency is not correct.
开关电源输出电压电源指示灯一闪一闪的，一般是副边有短路的。
The output voltage of switching power supply is flickering. Generally, there is a short circuit at the secondary side.
开关电源常见问题具体维修技巧以下就是具体问题具体分析了，基本上开关电源的问题都会有所涉及。
The specific maintenance skills of the common problems of switching power supply are as follows: the specific problems are analyzed in detail, and the problems of switching power supply are basically involved.
（1）开关电源中保险熔断的直接原因、开关管\电源厚模块\整流二极管击穿；100uf/400v大电容击穿漏电；消磁电阻内部碎裂。
(1) the direct cause of fuse breaking in switching power supply, breakdown of switch tube / power thick module / rectifier diode, breakdown and leakage of 100uF / 400V large capacitance, internal fragmentation of degaussing resistance.http://www.sdbczdh.com/news/cjwt/124.html
（2）开关电源各输出端始终无电压输出的最常见原因、交流220v整流滤波电路中的保险电阻开路、开关管基极到100uf/400v大滤波电容正极之间的电阻开路。
(2) the most common reasons for the voltage free output of each output end of the switching power supply, the open circuit of the fuse resistance in the AC 220 V rectifier filter circuit, and the open circuit of the resistance between the base of the switch and the positive pole of the 100uF / 400V large filter capacitor.
济南高压变频器维修开关电源维修技巧
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