Anti-common mode interference three-layer flat shielding power line

Abstract

The invention discloses an anti-common mode interference three-layer flat shielding power line comprising a plug and a flat cable. The flat cable comprises a base material; binding agent used for binding two separate materials; conductive layers used to transmit electric signals; an inner insulation layer used for isolating the conductive layers; a shielding layer used for shielding radiation interferences; and an outer insulation layer disposed on the outmost layer in a wrapped manner. The shielding layer is disposed between the inner insulation layer and the outer insulation layer. The plug comprises inserting sheets. A second power supply layer is disposed between a first power supply layer and a third power supply layer, and the second power supply layer is connected with a ground wire. The anti-common mode interference three-layer flat power line is advantageous in that the anti-interference technology effect can be achieved by forming the equivalent capacitance between the conductive layers; by adopting the simulated FPC structural design, the cable flattening in the real sense can be realized, and at the same time, the radiation interferences can be shielded by adopting the shielding layer, and therefore by comparing with the conventional power lines, the size of the cable is smaller, the thickness is thinner, and the anti-interference capability and the shielding capability are stronger.

Description

technical field [0001] The invention relates to the field of power cords, in particular to an anti-common-mode interference three-layer flat shielded power cord. Background technique [0002] The cable is twisted by several or several groups of wires, each group of wires is insulated from each other, and is usually twisted around a center, and the entire outer surface is covered with a highly insulating covering layer, so that the cable has internal energization and external insulation. Characteristics. [0003] In daily use, we often use three-plug power cords, and the three plugs are connected to the live wire L, the neutral wire N and the ground wire PE respectively. It is called "differential mode interference", and "differential mode interference" also refers to the interference voltage acting between the positive and negative terminals of the signal. This interference is loaded on the useful signal and directly affects the accuracy of measurement and control; the live...

AI Technical Summary

Problems solved by technology

[0003] In daily use, we often use three-plug power cords, and the three plugs are connected to the live wire L, the neutral wire N and the ground wire PE respectively. It is called "differential mode interference", and "differential mode interference" also refers to the interference voltage acting between the positive and negative terminals of the signal. This interference is loaded on the useful signal and directly affects the accuracy of measurement and control; the live wire and the ground wire The interference between them is called "common mode interference". This is because there is a potential difference between the cable and the earth, so that there will be a common mode current on the cable. If the device generates a common mode current on its cable, the cable will produce strong electromagnetic radiation. Electromagnetic interference to electronic and electrical product components affects product performance; in order to avoid the influence of "differential mode interference" and "common mode interference", people need to add some designs to suppress "differential mode interference" and "common mode interference". ", such as connecting capacitors in parallel on the circuit, or applying differential mode inductors, or adding EMI filters to the power supply line of the equipment, but such designs are difficult to achieve when the product volume is limited

[0004] At the same time, flat power cords are often used for electrical connections between mobile electrical equipment in harsh environments such as power generation, metallurgy, chemical industry, and ports. Flat power cords usually refer to the flattening of wires. Compared with the cable with circular structure, it is easy to install and has fewer potential safety hazards. However, the structure of multiple wires or cables placed in parallel in the flat cable makes the cables prone to mutual information interference during use. In this case, the patent announcement number is CN204066795U, which is an anti-interference flat cable. A hollow channel is provided between the cable inner cores inside the flat cable, and the air in the hollow channel is used to reduce the signal transmission process. The signal interference between the inner cores makes the signal transmission clearer and more accurate. However, the anti-interference effect of this invention is very limited. It can only resist radiation interference and cannot prevent conduction interference; and the hollow channel is increased, which increases the width of the cable. Makes power cords with such flat cables unsuitable for tight spaces

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