What about the leakage of the switching power supply? What is the standard for leakage current in switching power supply?

In the current hydropower project, the switch Power Supply is essential household supplies, switch power leakage how to do, there are many switch power supply products in the market, many functions, many brands, so, the choice also need special attention. A good brand will avoid leakage. What is the standard for leakage of Switching Power Supply? Let's take a look at some of the troubleshooting of the switching power supply, so that we know what to do about the leakage of the switching power supply.

What about the leakage of the switching power supply

How to deal with the leakage of the switching power supply? The switching power supply is isolated by a high frequency transformer at one time. Theoretically, there is no leakage at the output end. But the metal case of high-frequency switch is easy to sense voltage, giving the impression of leakage. Generally eliminated by grounding. Switch power leakage how to do, there are individual prevention switch power supply on the market, a high voltage part of the process is poor, some solder joints by sticking insulation paper and metal shell isolation, very dangerous. (AC220V becomes DC300V through low-frequency rectifier bridge and capacitor filtering, and then generates alternating current through high-frequency switching tube and high-frequency isolating transformer. The secondary end of high-frequency isolating transformer induces alternating low voltage, which becomes low-voltage direct current through high-frequency rectification and filtering.)

Switch power leakage how to do, the best housing ground. Or, in less demanding situations, remove the capacitance connected to the housing, the high voltage part and the low voltage part.

Standard for leakage current of switching power supply

Switching power supply leakage current standard, need to use the withstand voltage tester. The leakage current of the switching power supply is calculated by subtracting the current value of the switching power supply to the ground capacitance. Or disconnect the switching power supply from the ground capacitance, the leakage current measured by the withstand voltage tester is the leakage current that needs to be measured.

What is leakage current

In household appliances, the leakage current is the safe current between the operating electrical part and the metal after the insulation. The leakage current of an electrical appliance used for 220V AC is 0.75MA. It's tiny. One end of the AC haoan meter is connected to the power supply, after removing the ground wire, the other end of the AC Haoan meter is connected to the metal.

Best Regards,

Una Yang