Why touch the Y capacitor will have a touch inductance

The EMI filter circuit consists of an X capacitor, an inductor, and a Y capacitor. The circuit exits the inductor to two Y capacitors. They are grounded at one end and connected to the neutral and live wires at one end. They are resistant to interference from two power lines to the ground, also known as common mode interference. The X capacitor suppresses differential mode interference and the Y capacitor suppresses common mode interference. Since the Y capacitor works so much in the circuit, why does it touch the inductor when it is touched? Don't worry, let's answer for everyone.

Although the Y capacitor can suppress common mode interference, it also provides a leakage path for the supply current. The other end of the two Y capacitors is connected to the ground. To control the leakage current value, the connected capacitance should be as small as possible. Generally, the total capacity of the Y capacitor should be controlled below 4.7nF.

Although the household patch panels we purchased are all equipped with a grounding wire, in reality, many of the jacks are not grounded. Some merchants have a feeling of electric shock when they contact the electrical casing in order to save costs and not ground. This is caused by the Y capacitor discharge to ground. This is because the power discharged by the Y capacitor to the ground does not flow into the earth, but is transferred to the person through the electrical enclosure. This current is very small, it does not cause much harm to the human body, but no one wants to be charged. a bit.

At the same time, if the Y capacitor is broken down or short-circuited, it may cause harm to the human body. Therefore, the Y capacitor must be used at the same time, so that even if there is a failure or a short circuit, the human body will not be harmed. At the same time, the Y capacitor should be selected from the capacitor produced by the regular manufacturer. At the same time, the safety capacitor should be used, and the ordinary ceramic Y capacitor cannot be used.

If you have technical questions, please contact us and we will try our best to solve it for you.