Power adapter leakage how to do

In the plumbing and electrical engineering, power adapter is an essential household item, power adapter leakage how to do, power adapter products on the market is still quite a lot of many features, many brands, so the choice of the time also need to pay special attention. A good brand will avoid the emergence of leakage, power adapter leakage current standard is how much? Here we understand some power adapter troubleshooting, so we know how to deal with power adapter leakage how to deal with it.

Power adapter leakage how to do, power adapter high voltage through the high-frequency transformer isolation, theoretically there is no leakage at the output. However, the high-frequency switch metal shell is easy to induce voltage, giving the impression of leakage. Generally eliminated by grounding. Power adapter leakage how to do, there are individual prevention and control of power adapters on the market, a high-voltage part of the process is poor, some welding points by sticking insulating paper and metal shell isolation, very dangerous. (AC220V through the low-frequency rectifier bridge, capacitor filtering into DC300V, and then through the high-frequency switching tube, high-frequency isolation transformer to generate alternating current, high-frequency isolation transformer secondary end of the alternating current low voltage, through the high-frequency rectifier, filtering into low-voltage DC.) It is best to shell grounded. Or in less demanding occasions, remove the capacitor connected to the shell, the capacitor connected to the high-voltage part and the low-voltage part.

Leakage current standards for power adapters require a voltage withstand tester. The leakage current value measured by the voltage withstand tester, minus the current value of the power adapter to ground capacitance, is the leakage current of the power adapter. Or disconnect the power adapter's capacitance to ground, and the value of the leakage current measured by the withstand voltage tester is the value of the leakage current to be measured. In household appliances, leakage current is the safe current between the operating electrical part and the metal after insulation. The leakage current for 220V AC appliances is 0.75MA, which is very small. One end of the AC HOA meter is connected to the power supply, and after removing the ground wire, the other end of the AC HOA meter is connected to the metal-to-metal.

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