China supplier for Toroidal common mode choke inductor

TYPE : Common mode Choke

Common mode inductors, also called common mode chokes, are often used to filter the common mode electromagnetic interference signals in the switching power supply of the computer. In the design of the board, the common mode inductor also has function of EMI filtering, which is used to suppress electromagnetic radiation emitted from high speed signal lines.

Brand : Fullstar 

Series :  FTR Series/FTRB Series

               FUT SERIES

               FET SERIES

               FCM SERIES 

Application: Electric appliances, LED lights, Adaptors, Switching power supply, Dimmers, Electrical ballasts and Automative systems, etc.

Work Principle 

Why can the common mode inductor be able to prevent EMI? To make this clear, we need to start with the analysis of the structure of the common mode inductor.

The filter circuits of common mode inductors, La and Lb are common mode inductors. The two coils are around the same core, and the number and phase are the same (around the reverse). In this way, when the normal current in the circuit flows through the common mode inductor, the current will cancel each other in the same phase inductance coil, and the normal signal current is mainly affected by the coil resistance (and a small amount of damping due to leakage). When there is a common mode electric current, there is a common mode electric current.

Current flowing in the coil, due to the common mode current in the coil, it will produce the same magnetic field to increase the inductance of the coil. The coil impedance is high and have strong damping effect. Due to the attenuation of common mode current , finally it achieves the purpose of filtering.

In fact, one end of the filter circuit is connected to the interference source and the other end is jammed. La and C1, Lb and C2 constitute two groups of low-pass filters, which can make the common mode EMI signal on the line be controlled at a very low level. The circuit can not only suppress the incoming of the external EMI signal, but also attenuate the EMI signal produced by the circuit itself, and can effectively reduce the EMI interference intensity.

Fullstar produce common mode inductor by using high-frequency noise suppression strategy, common mode choke coil structure, signal attenuation, small volume, easy to use, with good balance, with high quality and so on. It is widely used in dual balance tuning device, multi frequency transformer, impedance transformer, balance and unbalanced transformer, etc.

There is a kind of common mode filter inductance /EMI filter inductor with ferrite core and double winding, noise suppression measures, high common mode noise suppression and low differential mode noise suppression, low differential mode noise signal interference suppression, difficult deformation in high speed signal, has small volume, well-balanced, convenient use, high quality etc.. Widely used in the suppression of electronic equipment EMI noise, personal computers and peripherals, USB lines, DVC, STB IEEE1394 lines, LCD panels, low voltage differential signals and so on.

See below some pictures

Fullstar also produce SMD common mode inductor

FSCM01 02 03 04 SERIES

More related products -- switching power transformer /Filter inductor  

Choke inductor package 

FULLSTAR ADVANTAGES

1.35 years of experience
2.Short delivery time, some parts are in stock

3.Factory-direct price
4.OEM projects
5.Samples are free and could be delivered in 4 days

6.Production capacity : 500,000 pcs/month

7.With complete and advanced automatic devices and more than 300 experienced staff
8.Complete certificates: UL insulation system, ISO 9001:2008, TS16949, RoHS