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When the power adapter is charging, there will be a slow charging phenomenon, this is the voltage is not good, then the power adapter caused by the output voltage is low what is the main reason? Next power adapter manufacturers for you to explain in detail.
1, the switching power supply load short-circuit fault (especially DC/DC converter short-circuit or poor performance, etc.), at this time, first off all the load of the switching power supply circuit, check whether the switching power supply circuit fault or the load circuit fault. If the load circuit is disconnected and the voltage output is normal, it indicates that the load is too heavy; Or the switch power circuit is faulty.
2, the output voltage end filter capacitor or rectifier diode failure, can be judged by the replacement method.
3, the performance of the switch tube is reduced, resulting in the switch tube can not be normally switched on, so that the internal resistance of the power supply increases, the load capacity decreases.
4, the switch transformer is bad, not only causes the output voltage drop, but also causes the switch tube excitation shortage, thus damaging the switch tube.
5, the 300V filter capacitor is poor, resulting in poor load capacity of the power supply, a load output voltage will drop.
Output overvoltage
The overvoltage usually comes from the stabilized voltage sampling and stabilized voltage control circuit. In DC output, sampling resistance, error sampling amplifier such as TL431, optocoupler, power control chip and other circuits composed of closed control loop, any part of the problem will cause the output voltage rise.
Fuse normal, no output voltage
The safety tube is normal and no output voltage indicates that the switching power supply is not working or has entered the protection state. The first step is to check the value of the starting voltage of the starting pin of the power control chip. If there is no starting voltage or the starting voltage is too low, check whether the components connected to the starting pin and the starting resistance leak electricity.
If the power control chip is normal, the fault can be quickly detected through the above monitoring. If there is a starting voltage, the output end of the control chip shall be measured to see whether there is a jump in high or low level at the moment of starting up. If there is no jump, it indicates that the control chip is damaged, the peripheral oscillating circuit element is damaged or the protection circuit is faulty. By replacing the control chip and checking peripheral components, check one by one. If in jump, most cases for the switch tube is bad or damaged.
The safety burns out or explodes
Mainly check the rectifier bridge, each diode, switch tube and 300 volts on the large filter capacitor. Lead to safety burning, black, may also be the anti-jamming circuit caused by problems. In particular, it is worth noting that the breakdown of the switch tube leads to ignition, which usually burns out the power control chip and current detection resistor. Thermistors can also easily be burned out along with the safety.
September 10, 2024
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September 10, 2024
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