Switching power supply with load capacity difference is what reason. My switching power supply output is 2A-24v. The output is not connected to the output is 24v. Connected to the 24v -5w lamp only 2v voltage. Even the switch power indicator light is not bright. What 's the matter?
1 switching frequency
2 output filter inductance capacitor is too small
3 output feedback loop fault, which is a bit connected to 1
4 labels are wrong
Switching power supply is very dangerous, driven load capacity is poor, if the circuit is no problem, that is, the capacitor problem, you can replace, and pay attention to dangerous ah
You are the design of their own power or repair products, has been successfully driven over the load did not. If it is repaired, he carefully check the circuit, replace the damaged original (such as the output of the filter electrolytic capacitor). If it is their own design. Please make sure you do the switch transformer there is no problem.
The biggest possibility is that the output capacitor is bad, deteriorated. As the switching power supply for a long time to work fever, so that the capacitor electrolyte dry, so the capacity decline, ESR (equivalent resistance) rise, simply say that its filter capacity decreased, so it can not be properly loaded, the use of low ESR specifications After the capacitor can be replaced. But must be low ESR, otherwise the switching power supply because of high frequency, high ESR of the ordinary capacitor may be due to serious fever burst.
