Chargers and power adapters are essential products in modern life,Adapter but what are the common faults of chargers and power adapters? How to repair them? Let’s take a look together to make life easier! Line failures,Adapter including power cord damage and no electricity,Adapter contact oxidization Poor contact,Adapter etc. Focus on checking whether the input line and output line are energized. If the line is faulty, it can be solved by replacing the power cord.
Excessive output voltage generally comes from the voltage stabilization sampling and voltage stabilization control circuit. In the closed control loop composed of DC output, sampling resistor,Adapter 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.
Output voltage is too low: switching power supply load short circuit failure (especially DC/DC converter short circuit or poor performance, etc.),Adapter at this time,Adapter 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,Adapter it means that the load is too heavy; or it is still abnormal,Adapter it means that the switching power supply circuit is faulty. The failure of the filter capacitor or rectifier diode at the output voltage can be judged by the replacement method. The performance of the switching tube is degraded, causing the switching tube to fail to conduct normally,Adapter which increases the internal resistance of the power supply and reduces the load capacity.
The defective switching transformer not only causes the output voltage to drop,Adapter but also causes insufficient excitation of the switching tube and thus damages the switching tube. The 5300V filter capacitor is bad,Adapter resulting in poor load carrying capacity of the power supply,Adapter and the output voltage will drop as soon as the load is connected.