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how to deal with the interference phenomenon of cable
Author:Yixing Xin Mao Cable Material Co., Ltd. | Addtime:2013-7-4 | Hits:
Cable is in the system lead to the most important factor in the electromagnetic compatibility problem. Therefore, in practice, often found that when the drag on the equipment cable down when the equipment can be smoothly through the test, electromagnetic interference phenomena encountered in the field, as long as to pull down the cable, fault phenomenon will disappear. This is because the cable is a high efficient receiving antenna and radiation. In addition, cable wires parallel transmission of the longest, so the conductor capacitance and mutual inductance between the larger division, it will lead to the signal of the conductor crosstalk.
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One of the main methods to solve the problem of cable is carried out on the cable shielding, but how should shielded cable termination, what kind of shielded cable is effective, such as a series of problems is a question of common concern and fuzzy. This section discusses the radiation problem of the cable, electromagnetic field interference problem of cable, wire signal crosstalk between problem, and the countermeasure to these problems.
1, the radiation problem of the cable
The radiation problem of the cable is one of the most common problem in engineering, more than 90% of the equipment (mainly including pulse circuit equipment) by radiation emission test are caused by cable radiation. Cable mechanism has two kinds of radiation, is a kind of signal current in the cable (differential mode current) circuit differential mode of radiation, another is the conductor cable (including shielding layer) on the common mode current is generated. The radiation of the cable is mainly from the common-mode radiation. Common-mode radiation is generated by common-mode currents, the common-mode current loop area is by the cable with the earth (or other nearby large conductor), thus has a larger loop area, can produce strong radiation. Common mode current is how many people are often confused. To understand this problem, first of all, clear the common-mode voltage is the primary cause of common-mode current and common mode voltage is the cable with the earth (or other nearby large conductor) between the voltage. Starting from the common mode voltage, search for the cause of common mode current is easy, and once the cause of a problem clearly, to solve the problem, it is not difficult.
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CopyRight 2013 Yixing Xin Mao Cable Material Co., Ltd. | ËÕICP±¸13039359ºÅ-1
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