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Do you know the reason why the power adapter burns out?

source:power adapter     Popular:adapter     release time:2021-07-19 10:39:49     Article author:sznbone    

  The power adapter in my home is often burned out during charging. At first, I thought it was because the quality of the power adapter was not good, but I finally checked it and it was not. So what is the reason?

Do you know the reason why the power adapter burns out?(图1)

  The first type: the output voltage is too high

  There will be problems with excessively high output voltage, which generally all come from the voltage regulator tube sampling and the voltage regulator tube control loop. In the closed and closed control loop composed of power circuits such as direct current output, photocoupler, switching power supply control integrated ic, etc., problems in all of the parts are caused by the rise of the output voltage.

  Type 2: Common faults of the route

  The common faults of the route are very well understood, that is to say, the charger wire will be disconnected from the power supply or damaged. This problem can be solved by removing the cable.

  The third type: commercial insurance burned out or destroyed

  The key to check the positions of the rectifier bridge, diodes, switch tubes and their large filter capacitors. Burning and blackening of commercial insurance will also be caused by problems in the anti-interference power supply circuit. In particular, special attention is paid to the fact that commercial fuse burns due to thermal breakdown of the switch tube will generally burn out the integrated IC and current detection resistor of the switching power supply. The thermistor is also very easy to burn out along with commercial insurance.

  The fourth type: output voltage is too low

  The key reason for the low output voltage:

  1. Switching switching power supply load short-circuit fault problem, especially in the DC/DC converter short-circuit fault or poor characteristics, etc.;

  2. The output voltage end filter capacitor or rectifier diode is invalid, etc., which can be distinguished according to the substitution method;

  3. The characteristics of the switching tube are reduced, which causes the switching tube to fail to be turned on and off normally, which increases the internal resistance of the switching power supply and reduces the load working capacity;

  4. The switching transformer is not good enough, which not only causes the output voltage to decrease, but also leads to insufficient encouragement of the switching tube and destroying the switching tube;

  Type 5: Non-standard power plug

  Our standard household installation single-phase electric power plug pole grounding device and the two methods of apex and soil. The application of the power plug shown in the figure should be able to prevent single-pole penetration. In addition, the appearance of the power plug does not match The requirements of the most common industrial plugs used in China are not detailed, it is very simple to cause electric shock accidents.

  The sixth type: the marking of goods is not detailed or standardized

  Identification should include the proper installation and proper guidance of the key information content of the customer to mark the shipping product, so as to ensure the personal safety of the customer and one of the fundamental methods for the safety of the industrial chain.

  Seventh: commercial insurance damage

  Commercial insurance destroys the key inspection rectifier bridge, diode, etc., in addition, it will also be caused by the hazard of the anti-interference power circuit. The key is to check the positions of the rectifier bridge, the diodes, and the large filter capacitor of the switch tube. Burning and blackening of commercial insurance will also be caused by problems in the anti-interference power supply circuit. In particular, special attention is paid to the fact that commercial fuse burns due to thermal breakdown of the switch tube will generally burn out the integrated IC and current detection resistor of the switching power supply. The thermistor is also very easy to burn out along with commercial insurance.


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