What are some common failures of power adapters？

Aug 14, 2023

The first is the fuse blowing. In general, the internal wiring of the power supply if the design is not reasonable, the fluctuation of the external grid voltage, surge is likely to cause an instantaneous increase in the current within the power supply and cause the fuse to blow. If the fuse is replaced again and the adapter still does not work properly, the various components on the circuit board are likely to be pierced by this instantaneous high current.

There is also a failure of the fuse is intact, the power adapter does not have DC voltage or voltage output is not stable. Then it is likely that the adapter internal open circuit or short-circuit conditions. The input current is too high, and the rectifier diode in the high-frequency rectifier filter circuit is broken. Or the power supply control circuit failure, you can use a multimeter to test to find out the parts of the failure.

The last common failure is the poor load capacity of the power supply. If the power supply works for too long, the components of each part are prone to aging, so the stability of the voltage is poor when working, and the heat can not be dissipated in time, which is also the reason why the old power supply is prone to leakage or cause fire.

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