Disadvantages of no y capacitance in circuit design

Safety regulation capacitance refers to the capacitance used in such occasions, that is, after the failure of the capacitor, it will not cause electric shock and do not endanger personal problems. It includes two types: x-capacitance and y-capacitance. X-capacitance is the capacitance across the power line (L-N), y-capacitance is the capacitance across the power line (l-e, N-E) and the ground (l-e, N-E), generally in pairs. X-capacitance suppresses differential mode interference and y-capacitance suppresses common mode interference. Can y capacitor be used in the circuit?

The main functions of Y capacitor are:

1. Reduce the influence of external common mode interference on the equipment and improve the anti common mode interference ability of the equipment, which is also called EMS.

2. Reduce the common mode interference EMI of equipment to the outside, mainly including conducted common mode interference and radiation interference.

After understanding the function of Y capacitance, we know that as long as y capacitance is anti-interference capability, it can work without y capacitance in the circuit, but it doesn't mean that it can work normally. If y capacitance is not available in the circuit design, it may be interfered by other capacitors or interfere with other capacitors, resulting in its failure to work normally or interfere with the normal operation of other capacitors Work.

Use y-capacitor to ground and use in pairs, because if y-capacitor is broken down or short circuited, it may cause harm to human body. It is not only necessary to have y capacitance in circuit design, but also important to use x capacitance, and it is not allowed to use ordinary capacitance instead of safety capacitance.