Anti-interference three-layer flat shielding cable

Abstract

The invention discloses an anti-interference three-layer flat shielding cable which comprises a base material, adhesive for connecting two separation materials, a conductor for transmitting electric signals, an inner insulating layer for isolating the conductor, a shielding layer for shielding radiated interference and an outer insulating layer arranged on the outermost layer in a wrapping mode. The conductor sequentially comprises a first conducting layer, a second conducting layer and a third conducting layer from top to bottom, wherein cross sections of the first conducting layer, the second conducting layer and the third conducting layer are in a sheet shape, the first conducting layer is connected with the shielding layer, and the third conducting layer is connected with the inner insulating layer. According to the anti-interference three-layer flat shielding cable, through equivalent capacitance formed among the three layers of the conductor, the anti-interference technical effect is achieved, through FPC imitation structural design, cable flattening is achieved in real sense, and meanwhile the outer insulating layer isolates an electric wire, so that people are prevented from being injured by electric shock, the shielding layer shields radiated interference, and tension resistance is achieved through a reinforcing component, so that the cable can be smaller in size, smaller in thickness and higher in anti-interference capacity and shielding capacity compared with an existing flat cable.

Description

technical field [0001] The invention relates to the field of wires and cables, in particular to an anti-interference three-layer flat shielded cable. 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 wire and th...

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 cables are often used for electrical connections between mobile electrical equipment in harsh environments such as power generation, metallurgy, chemical industry, and ports. Compared with cables with round structures, they are easier to install and have fewer potential safety hazards. The structure of multiple wires or cables placed in parallel makes the cables prone to mutual information interference during use. In view of this situation, the patent announcement No. CN204066795U is an anti-interference flat cable. There is a hollow channel between the cable inner cores inside the flat cable, and the air in the hollow channel can reduce the signal interference between the cable inner cores during the signal transmission process, so that the signal transmission is clearer and more accurate. However, the anti-interference of the invention The effect is very limited, it can only resist radiation interference, but cannot prevent conduction interference; and the hollow channel is added, that is, the width of the cable is increased, making the flat cable unsuitable for narrow spaces

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