source:Industry News Popular:adapter release time:2022-04-14 11:09:49 Article author:yu
With the popularity of personal smart mobile devices, power adapters have become one of the essential necessities of life. In daily use, the power adapter will be damaged, so what are the common reasons for the damage of the power adapter?
The first: the output voltage is too high
The high output voltage generally comes from the voltage-stabilizing sampling and voltage-stabilizing control circuits. In the closed control loop composed of the DC output, sampling resistor, error sampling amplifier such as TL431, optocoupler, power control chip and other circuits, any problem in any of these parts 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 start-up voltage of the start-up pin of the power control chip. If there is no start-up voltage or the start-up voltage is too low, check whether the components connected to the start-up pin and the start-up resistor are leaking. If the power control chip is normal, the fault can be quickly found through the above monitoring. If there is a start-up voltage, measure whether the output terminal of the control chip has jumps of high and low levels 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. By replacing the control chip Chip, check peripheral components, check one by one; if it is jumping, in most cases, the switch tube is bad or damaged.
The second: line failure
Line faults, including damage to the power cord, no power supply, poor contact port oxidation, etc. Focus on checking whether the input line and output line are powered on. If the line is faulty, it can be solved by replacing the power cord.
The third type: the insurance burns out or blows up
Mainly check the rectifier bridge, diodes, switch tubes and large filter capacitors on 300 volts. It may cause the fuse to burn and become black, or it may be caused by a problem with the anti-jamming circuit. It is especially worth noting that the fuse is burned due to the breakdown of the switch tube, which usually burns out the power control chip and the current detection resistor. The thermistor is also easy to burn out along with the fuse.
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