OEM Factory Wall Plug In Adaptor CE GS 12v Power Supply AC DC Adapter

How can I avoid dangers such as short circuiting my charger?

Chargers and power adapters are a necessity in modern life, but what are the common failures of chargers and power adapters? How to repair? We come together to understand, convenient life!

First, line failure
Line faults, including power line damage does not energize, contact port oxidation poor contact and so on. Focus on checking whether the input line and output line are energized.
If it is a line failure, it can be solved by replacing the power cord and so on.

Second, the output voltage is too high
Output voltage is generally too high from the regulator sampling and regulator control circuit. In the DC output, sampling resistors, error sampling amplifiers such as TL431, optocoupler, power control chip and other circuits together constitute a closed control loop, any one of these parts will cause problems with the output voltage.

Third, the output voltage is too low
The following are the main causes of low output voltage:
1 switching power supply load short circuit failure (especially DC/DC converter short circuit or poor performance, etc.), at this time, first disconnect all the load of the switching power supply circuit, check whether the switching power supply circuit failure or load circuit failure. If you disconnect the load circuit and the voltage output is normal, indicating that the load is too heavy; or still not normal switching power supply circuit failure.
2 output voltage filter capacitor or rectifier diode failure, etc., can be judged by the replacement method.
3 The performance of the switching tube is reduced, resulting in the switching tube can not be normal conduction, so that the internal resistance of the power supply increases and the load capacity decreases.
4 bad switching transformer, not only cause the output voltage drop, at the same time cause the switching tube excitation is not enough to damage the switching tube.
5300V filter capacitor is bad, resulting in poor power supply with load capacity, a connected load output voltage will drop.

Fourth, the insurance burned out or blown
Mainly check the rectifier bridge, each diode, switching tube and 300 volts on the large filter capacitor and other parts. Caused by the insurance burn, black, may also be caused by problems in the anti-interference circuit.
Particularly note that the fuse burns due to the switching tube breakdown, which usually burns out the power control chip and the current detection resistor. Thermistors are also easily burned out along with the fuse.
Charger / power adapter common faults and maintenance is here, in addition, we should pay attention to the charger / power adapter routine maintenance and repair, which can reduce the occurrence of failures, but also effectively extend the service life.

Fifth, the fuse is normal, no output voltage
Normal fuse, no output voltage indicates that the switching power supply is not working or has entered a protective state. The first step is to check the value of the startup voltage of the startup foot of the power control chip, if there is no startup voltage or the startup voltage is too low, then check the startup foot of the external components and the startup resistor is leakage.

If the power control chip is normal, the above monitoring can be quickly found where the fault is. If there is a start-up voltage, then measure the output of the control chip in the boot moment whether there is a high, low level jump, such as if there is no jump, indicating that the control chip is damaged, the peripheral oscillation circuit components are damaged or the protection circuit is faulty, through the replacement of the control chip, check the peripheral components, one by one to carry out the inspection; if in the jump, most of the cases for the switching tube is bad or damaged.

If you want to know more about switching power supply information, you can consult Xiamen Eahunt Electronics.

Whatsapp:+86 13860786068

Email: athene-cai@eahunt.com

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