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Common faults and maintenance of charger / power adapter

2017-05-04

Common faults and maintenance of charger / power adapter

In our daily life, we often come into contact with the charger / power adapter, and often encounter some problems during use, such as common poor contact, unstable voltage, or insurance burnout. So how do we check and eliminate What about below? Lefeng shares common faults and maintenance of charger / power adapter.

Chargers / power adapters produced by regular manufacturers have a nameplate indicating the indicators of power, input and output voltage, and current. It is worth noting the input voltage range. Generally speaking, chargers / power adapters with an input voltage of 110V-240V can be used globally and suitable for all countries and regions.

: Common faults and maintenance of charger / power adapter :

First, the line is faulty

Line failures, including power lines that are damaged and not energized, and poor contact oxidation on contact ports. Check whether the input line and output line are energized.

If the line is faulty, it can be solved by replacing the power cord.

Second, the output voltage is too high

The high output voltage usually comes from the regulated sampling and regulated control circuit. In the closed control loop composed of DC output, sampling resistor, and error sampling amplifier such as TL431, optocoupler, power control chip and other circuits, any one of the parts will cause the output voltage to rise.

Third, the output voltage is too low

The following are the main causes of low output voltage:

1 Switching power supply short-circuit fault (especially short circuit or poor performance of DC / DC converter), at this time, first disconnect all loads of the switching power supply circuit, and check whether the switching power supply circuit is faulty or the load circuit is faulty. If the load circuit is disconnected and the voltage output is normal, it means that the load is too heavy; or if it is still abnormal, the switching power supply circuit is faulty.

2 The output capacitor of the filter capacitor or rectifier diode at the output voltage can be judged by replacement method.

3 The performance of the switching tube is reduced, which causes the switching tube to fail to conduct normally, which increases the internal resistance of the power supply and reduces the load capacity.

4 Defective switching transformer, not only causes the output voltage to drop, but also causes insufficient excitation of the switching tube and damages the switching tube.

The 5300V filter capacitor is bad, causing the power supply to carry a poor load capacity, and the output voltage will drop as soon as the load is connected.

Fourth, the insurance burned out or blown up

Mainly check the rectifier bridge, diodes, switching tubes and large filter capacitors on 300 volts. It may cause the fuse to burn or black, or it may be caused by a problem with the anti-interference circuit.

In particular, it should be noted that the fuse burned due to the breakdown of the switch tube usually burns out the power control chip and the current detection resistor. The thermistors can also easily be burned with the fuse.

The common faults and repairs of the charger / power adapter are mentioned here. In addition, we must pay attention to the daily maintenance and maintenance of the charger / power adapter, which can reduce the occurrence of faults and effectively extend the service life.

Five, the fuse is normal, no output voltage

The fuse is normal, and no output voltage indicates that the switching power supply is not working or has entered a protection state. The first step is to check the value of the startup voltage of the startup pin of the power control chip. If there is no startup voltage or the startup voltage is too low, check the components external to the startup pin and the startup resistor for leakage.

If the power control chip is normal, the fault can be quickly detected through the above monitoring. If there is a startup voltage, measure whether there is a high or low level transition at the output end of the control chip at the moment of startup. If there is no transition, it means that the control chip is damaged, the peripheral oscillation circuit components are damaged, or the protection circuit is faulty. Chips, inspection of peripheral components, inspection one by one; if the transition, most cases are defective or damaged switch.

For more information about common power adapters and power chargers, please continue to pay attention to the official website of Gio Technology Power!