In current hydropower projects, switch mode power supplies are essential household items. What to do if there is a leakage of switch mode power supplies? There are still many switch mode power supply products on the market with many functions and brands, so special attention should be paid when choosing. A good brand will prevent leakage. What is the leakage current standard for switch mode power supplies? Below we will learn about some troubleshooting methods for switch mode power supplies, so that we can understand what to do and how to deal with power supply leakage.

What should I do if there is a leakage in the switch power supply
What should I do if there is a leakage in a switching power supply? The primary high voltage of the switching power supply is isolated by a high-frequency transformer, and theoretically there is no leakage at the output terminal. But the metal casing of high-frequency switches is prone to inducing voltage, giving the impression of leakage. Usually eliminated through grounding. What should I do if there is leakage in switch mode power supplies? There are some prevention and control measures available in the market for switch mode power supplies. The process of the high-voltage part is poor, and some welding points are isolated from the metal shell by sticking insulation paper, which is very dangerous. AC220V is converted into DC300V through a low-frequency rectifier bridge and capacitor filtering, and then produces alternating current through high-frequency switching tubes and high-frequency isolation transformers. The secondary end of the high-frequency isolation transformer induces alternating low voltage, which is then rectified and filtered into low-voltage direct current. )
What to do if there is a leakage in the switch power supply? It is best to ground the casing. Or in situations where the requirements are not high, remove the capacitors connected to the casing and the capacitors connected to the high-voltage and low-voltage parts.

Standard for Leakage Current of Switching Power Supply
The leakage current standard for switch mode power supplies requires the use of a voltage tester. The leakage current value of the switch power supply is obtained by subtracting the current value of the ground capacitor of the switch power supply from the leakage current value measured by the voltage tester. Alternatively, disconnect the ground capacitor of the switching power supply, and the leakage current value measured by the voltage tester is the leakage current value that needs to be measured.
What is leakage current
In household appliances, leakage current refers to the safe current between the operating electrical parts and the metal after insulation. The leakage current of electrical appliances used for 220V AC is 0.75MA, which is very small. Connect one end of the AC power meter to the power supply, remove the grounding wire, and then connect the other end of the AC power meter to the metal.