Wire harness shielding technology is an important means of preventing electromagnetic interference and radiation, widely used in fields such as automobiles, communications, and electronic devices. The following is a comprehensive overview of wire harness shielding technology, including principles, structures, application scenarios, etc.:

1、 The principle of wire harness shielding technology

Wire harness shielding technology mainly uses shielding layers to prevent electromagnetic interference and radiation. The shielding layer utilizes the principles of metal reflection, absorption, and skin effect on electromagnetic waves to effectively prevent external electromagnetic interference from entering the cable, while also preventing internal signal radiation. Skin effect refers to the distribution of current on the cross-section of a conductor that tends to the surface of the conductor with increasing frequency. The higher the frequency, the weaker the penetration ability of electromagnetic waves

2、 Structure of wire harness shielding technology

There are various structures of wire harness shielding technology, including the following common ones:

Braided shielding with metal foil: It consists of two parts: metal foil and braided shielding layer. Metal foil is mainly used to prevent high-frequency interference, while braided shielding layer is used to prevent low-frequency interference

Single woven shielding: Only using a woven shielding layer without metal foil, the shielding effect on high-frequency electromagnetic interference is relatively poor

Single metal foil shielding: Only metal foil is used, eliminating steps such as cutting, flipping, and pressing shielding rings, simplifying the production process of wire harnesses

Twisted pair cable with shielding layer: Twisted pair cable is formed by twisting two mutually insulated wires together at a certain twist distance, with an outer layer wrapped with a conductive material as a shielding layer, which can further enhance anti-interference ability

3、 Application scenarios of wire harness shielding technology

Wire harness shielding technology is widely used in the following fields:

New energy vehicles: Shielding of high-voltage wiring harnesses is particularly important, and commonly used shielding methods include wires with built-in shielding layers, adding shielding sleeves outside the wires, and shielding from the source

In the field of communication, shielded cables can prevent the transmission of data from being affected by external electromagnetic interference and radio frequency interference, ensuring the integrity of signal transmission

Electronic devices: In electronic devices, shielding technology can prevent electromagnetic interference inside the device from affecting the normal operation of other devices

4、 The development trend of wire harness shielding technology

Optimizing braided shielding structure: reducing wire costs and making it easier to process

De shielding design: More and more host manufacturers are considering de shielding of wires, requiring the simultaneous development of matching high-voltage connectors, shielding sleeves, filter modules, etc