Under what circumstances will the power adapter be damaged?

　　Under what circumstances will the power adapter be damaged?

　　1. The output voltage is too high

　　The problem of excessively high output voltage will occur, which generally comes from the voltage stabilization sampling and voltage stabilization control circuit.

　　2, the output voltage is too low

　　The switching power supply load is short-circuited, the output voltage end filter capacitor or rectifier diode fails, the performance of the switch tube is degraded, the transformer is bad, the filter capacitor is bad.

　　3, line failure

　　The line fault is well understood, that is, the charger wire may be out of power or damaged. This replacement wire can basically solve this problem.

　　4. Insurance damage

　　Insurance damage is mainly to check the rectifier bridge, diode, etc., and it may also be caused by the influence of the anti-interference circuit.

　　Of course, there are other reasons that can also cause damage to the power adapter, such as external force bumps, high temperature, etc., which will not be introduced here.

　　How to choose a power adapter? What are its working parameters

　　The main working parameters of the power adapter:

　　1. Input voltage and input current;

　　2. Output current and output current;

　　3. Output connector (interface) and output polarity (basically different brands have their own standards);

　　Generally, notebook adapters have 110-240V input, which conforms to global international standards.

　　Please refer to the following principles for purchasing a power adapter:

　　1. The principle is to choose the same brand and the same type, if not, you can only find other brands;

　　2. The output voltage of the power adapter should be the same as the voltage required by the notebook. If it is different, it should be as close as possible to the required voltage of the notebook and controlled within ±5% error. This is because the voltage regulator circuit in the notebook generally has The margin design, when the input voltage changes within a certain range, it can work normally and stably; if the voltage exceeds this range, the voltage is too low, the computer may not work stably or even light up the machine; if the voltage is too high, it may burn the voltage regulator in the computer Circuit. For example, an Acer notebook requires 15V, 3.36A input, but it can be used normally with an IBM 16V, 3.36A adapter.

　　3. The maximum output current of the power adapter should be as consistent as possible with the maximum current required by the notebook. If it is different, it should be equal to or greater than the required current of the notebook; Note: As long as the current is large, you don’t have to worry about how large it is. Don’t be afraid of being too big, don’t worry about burning the machine! But the current should not be too small, because unstable conditions such as screen flicker may occur. For example, the adapter of IBM T30 (16V, 4.5A), although it can be safely used on IBM ThinkPad T20 (16V, 3.36A), it can also be used on ThinkPad X31 (16V, 3.5A); the principle is: the power adapter is based on the load The situation to adjust the output current is not static.

　　Like the IBM 16V, 4.5A power adapter above, it can provide a maximum working current of 4.5A, but when used on T20, it also outputs a maximum of 3.36A. In fact, due to the different working conditions of the notebook computer, the current it needs is constantly changing. The adapter adjusts the output power at any time according to the working condition of the notebook to meet the needs of the computer. Adapters with a higher output current are more comfortable, and have a taste of "killing a sledgehammer". But the reverse is not good. Although the T20 adapter can also light up the T30, the T30 screen sometimes flickers. This is because the T20 adapter cannot stably provide the working current required by the T30.

　　4. This last point should have been ranked first, that is the output interface and output polarity of the power adapter (note the positive and negative poles). You must first ensure that the purchased adapter can be plugged into your laptop, otherwise it will be counted. The working parameters are exactly the same, but if you can't plug it in, what's the use for you. Due to the independence of major notebook manufacturers, adapter connectors of different brands are different. Each series of notebook adapters of the same brand generally have connectors of the same specification, but sometimes different brands may also use the same connector.

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