Ni-Zn Ferrite Motor Inductor

Ni-Zn Ferrite Motor Inductor

Common mode Choke, also known as common mode choke, is used to filter common mode electromagnetic interference signals in computer switching power supply. In the board design, the common mode inductor also plays the role of EMI filtering, which is used to suppress the electromagnetic wave emitted by the high-speed signal line.

The motherboard inside the computer is mixed with a variety of high-frequency circuits, digital circuits and analog circuits. When they work, a large number of high-frequency electromagnetic waves interfere with each other, which is EMI. EMI can also be emitted out through the wiring of the mainboard or external cables, causing electromagnetic radiation pollution and affecting the normal operation of other electronic equipment.

The chip on the PC board is both an EMI object and an EMI source. Generally speaking, we can divide these EMI into two categories: cascade mode (differential mode) and common mode (ground). Take the two PCB wiring on the motherboard (connecting the main board components of the conductor) as an example, the so-called crosstalk interference, refers to the interference between the two wiring; The common-mode interference is caused by the potential difference between the two lines and the PCB ground wire. The crosstalk mode interference current acts between two signal lines and its conduction direction is consistent with the waveform and signal current. The common mode interference current acts between the signal line and the ground wire. The interference current flows through half of the two signal lines in the same direction, and the ground wire is the common loop.