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Understand the cause of low output voltage caused by power adapter.ac power adapters Production

source:power adapter     Popular:adapter     release time:2021-11-30 09:21:53     Article author:sznbone    

  Understand the cause of low output voltage caused by power adapter.ac power adapters Production(图1)

  The following are the main reasons for the low output voltage caused by the power adapter:

  1. Switching power supply load short circuit failure (especially DC/DC converter short circuit or poor performance, etc.). 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 it is still abnormal, it means that the switching power supply circuit is faulty.

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

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

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

  5. The poor 300V filter capacitor results in poor load carrying capacity of the power supply, and the output voltage will drop as soon as the load is connected.

  The output voltage is too high

  Excessive output voltage generally comes from voltage stabilization sampling and voltage stabilization control circuits. In the closed control loop composed of DC output, sampling resistor, error sampling amplifier such as TL431, optocoupler, power control chip and other circuits, any one of the components will cause the output voltage to rise.

  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 whether the external components of the startup pin and the startup resistor are leaking.

  If the power control chip is normal, the fault can be quickly found through the above monitoring. If there is a startup voltage, measure whether there are high and low level jumps at the output of the control chip at the moment of power-on. If there is no jump, it means that the control chip is damaged, the peripheral oscillation circuit components are damaged or the protection circuit is faulty, and the control chip is replaced. Chips, check the peripheral components, and check them one by one; if they are changing, most of them are bad or damaged switch tubes.

  The difference and relationship between switching power supply and linear power supply

  Our common power supplies, including power adapters and chargers, are all switching power supplies. Switching power supply is a power supply that maintains a stable output DC voltage by controlling the time ratio of switching on and off. The switching power supply is generally composed of pulse width modulation control IC and MOSFET field effect transistors. High-frequency switching power supply is the direction of its development. High-frequency makes switching power supply miniaturized and enables switching power supply to enter a wider range of applications, especially in the high-tech field. It promotes the miniaturization and lightness of high-tech products. change. In addition, the development and application of switching power supplies are of great significance in saving energy, saving resources and protecting the environment.


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