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What are the common faults of switching power supply? How to repair?

source:power adapter     Popular:adapter     release time:2021-07-23 10:44:12     Article author:sznbone    

  What are the common faults of switching power supply? How to repair?

  1. No output, general safety tube

  This phenomenon affirms that the switching power supply is not working or has entered the form. Firstly, measure whether the startup pin of the power control chip can have a startup voltage. If there is no startup voltage or the startup voltage is too low, check whether the startup resistor and the external components of the startup pin can leak. The above checks can quickly find faults. If there is a starting voltage, measure whether the output terminal of the control chip can have high and low level jumps at the moment of power-on. If there is no jump, declare that the control chip is broken, the peripheral oscillating electrical components or the electricity are defective, and the control can be replaced first Chip, check the peripheral components; if there is a jump, it is generally a bad or damaged switch tube.

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  2. Safely burn or fry

  Secondly, check the large filter capacitor on the 300V, the diodes of the rectifier bridge, the switch tube and other parts. The problem of anti-interference power will also lead to safety fever and blackening. It should be noted that the safety burning caused by the breakdown of the switch tube will generally burn out the current detection resistor and the power control chip. Negative temperature coefficient thermistors are also easy and safe to burn out all the way.

  3. There is output voltage, but the output voltage is too high

  This kind of fault generally comes from the steady voltage sampling and steady voltage control of electricity. The DC output, sampling resistor, error sampling amplifier such as TL431, optocoupler, power control chip, etc. form a closed control loop. Any problem will cause the output voltage to rise.

  4. The output voltage is too low. In addition to the regulated power supply, it will cause the output voltage to be low. There are also the following reasons that can also cause the output voltage to be low:

  A. The switching power supply load has short faults (especially the DC/DC converter is short or malfunctioning, etc.). At this time, all loads of the switching power supply should be disconnected to distinguish whether the switching power supply is faulty or the load power is faulty. If the output voltage is normal when the load is disconnected, the load is too heavy; or the switching power supply is still faulty.

  B. The failure of the rectifier diode and filter capacitor at the output voltage side can be judged by substitution method.

  C. The performance of the switch tube is reduced, which will inevitably lead to the failure of the switch tube to conduct normally, which increases the internal resistance of the power supply and reduces the load capacity.

  The common faults and maintenance of switching power supply are introduced here, I hope everyone can use the switching power supply correctly!


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