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Taiwan SMD common mode factory

商品: SMD common mode

發表日期:2018-10-15 23:31:43

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SMD common mode introduction

EMI Electromagnetic Interference

SMD Common mode, also known as common mode choke, is commonly used in computer switching power supplies to filter common mode electromagnetic interference signals. In the design of the board, the common mode inductor also acts as an EMI filter to suppress the electromagnetic radiation generated by the high-speed signal line from radiating outward.
 
SMD common mode:Taiwan SMD common mode factory
 
The main board of the computer is mixed with various high frequency inductor, digital circuits and analog circuits. When they work, a large number of high-frequency electromagnetic waves are generated to interfere with each other. This is EMI. EMI will also be emitted through the motherboard wiring or external cables, causing electromagnetic radiation pollution and affecting the normal operation of other electronic devices.
The chip on the PC board is both an electromagnetic interference object and a source of electromagnetic interference during operation. In general, we can classify these electromagnetic interferences into two categories: series mode interference (differential mode interference) and common mode interference (grounding interference). Take the two PCB traces on the motherboard (the wires connecting the components of the motherboard) as an example. The so-called serial-mode interference refers to the interference between the two traces; the common-mode interference is the two traces and the PCB ground. Interference caused by the potential difference between the lines. The series mode interference current acts between the 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 line, and the interference current flows through the two signal lines. One and the same direction, and the ground line is a common circuit.

SMD common mode function

If the common mode current generated by the board is not attenuated (especially common mode currents on high-speed interface traces such as USB and IEEE 1394 interfaces), the common mode interference current can easily generate electromagnetic radiation through the interface data lines— - Common mode radiation due to common mode current in the cable. The FCC of the United States, the CISPR22 of the Special Committee on International Radio Interference, and the standard specifications such as GB9254 in China all have related restrictions on common mode conducted interference and radiated emissions of communication ports of information technology equipment. In order to eliminate the interference signal input on the signal line and the various interferences induced, we must reasonably arrange the filter circuit to filter the interference of the common mode and the series mode. The common mode inductance is a component of the filter circuit.
 
SMD common mode:Taiwan SMD common mode factory
 
The SMD common mode inductor is essentially a bidirectional filter: on the one hand, it is necessary to filter out common mode electromagnetic interference on the signal line, on the other hand, it is necessary to suppress itself from emitting electromagnetic interference and avoid affecting the normal operation of other electronic devices in the same electromagnetic environment.

SMD common mode provider: BINGRI Tech

Contact BINGRI: BINGRI Tech

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    Anna雅婷 2018-10-16 09:47:19

    BINRI Tech produce SMD common mode , SMD passive componet, taiwan automotive component, taiwan high frequency inductor.

    BINRI is a good passive component company due to their high quality products and service.

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    Chris 哥 2018-10-16 23:13:02

    SMD common mode

    SMD passive component

    In the conventional single-stage EMI filter circuit, common mode noise filters (LCM, CY1 and CY2) and differential mode noise filters (LDM, CX1 and CX2) form an "LC filter" attenuation. Mode and differential mode noise. The common mode inductor is usually made of high magnetic manganese Zn (Mn-Zn) ferrite (Ferrite) with an inductance value of 1~50mH. The common mode inductor, is arranged according to the polarity of the winding. Although the two sets of coils respectively flow through the load current, the internal magnetic lines of the core cancel each other out, and there is generally no problem of core saturation. Commonly used cores are Toroidal, UU (UU-9.8, UU-10.5, etc.), ET and UT. In order to obtain sufficient common-mode inductance values, the coupling between the two sets of coils is best achieved, so the ring-shaped or integrally formed ET and UT cores with higher construction cost are often used.

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