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一、开关电源始终无输出电压1.无输出电压故障的特征故障特征:开关电源始终无电压输出是指开关电源各输出端在按动电源开关,开机的瞬间和之后为OV(表针无摆动)。这种情况是由于开关电源未产生振荡所致。进一步证实的方法是:测交流220V整流、滤波电路中耐压400V以上容量在100～560μF大滤波电容关机后的电压,若仍为200V以上,之后慢慢下降,则说明开关电源确未产生振荡。开关电源未产生
First, the switching power supply has no output voltage 1. No output voltage fault characteristics Fault characteristics: Switching power supply voltage output is always refers to the output of the switching power supply in the press the power switch, boot moment and then OV (needle without swing) . This situation is due to the switching power supply is not caused by oscillation. To further confirm the method is: measured AC 220V rectifier, filter circuit withstand voltage 400V above the capacity of 100 ~ 560μF large filter capacitor after the shutdown voltage, if still above 200V, then slowly decline, then the switching power supply did not produce oscillation . Switching power supply is not generated