The disadvantage of no Y capacitor in circuit design

Safety capacitors refer to capacitors used in such situations, that is, after a capacitor fails, it does not cause an electric shock and does not endanger personal problems. It consists of two types: X capacitor and Y capacitor. The x capacitor is a capacitor that is connected between the two lines of the power line (LN). The Y capacitor is a capacitor that is connected between the two lines of the power line and the ground (LE, NE). Generally, they appear in pairs, X capacitors suppress differential mode interference, and Y capacitors suppress common mode interference. Can you use a Y capacitor in the circuit?

The main role of the Y capacitor is:

1. Reduce the influence of external common mode interference on the equipment and improve the anti-common mode interference capability of the equipment. This is also called EMS.

2. Reduce common-mode interference EMI of the device to the outside world, including conduction common mode interference and radiated interference.

After understanding the role of the Y capacitor, we know that the Y capacitor is anti-interference ability, so the circuit can work without the Y capacitor. However, it does not mean that it can work normally. If there is no Y capacitor in the circuit design, it may Interference with other capacitors or interference with other capacitors may cause them to malfunction or interfere with the operation of other capacitors.

It is worth noting that the Y capacitor should be grounded and used in pairs, because if the Y capacitor breaks down or shorts, it may cause harm to the human body. If it is used in pairs, even if there is a failure or breakdown short circuit, It also guarantees the protection of the human body from harm. Not only in the circuit design, but also in the circuit design, the X capacitor is also very important, and can not replace the safety capacitor with a common capacitor. When you encounter the Y capacitor damage in the switching power supply, you should pay more attention to it. You must find the replacement of the same model. Feel free to replace!