Connector include shielded connector. It is a kind of component that electronic engineering technicians often contact. Domestic also known as connectors, plugs and sockets. Generally refers to electrical connectors. A device that connects two active devices to transmit a current or signal. The shielded connector is a kind of positioning connector connected to the electronic circuit, which is composed of two parts, that is, the plug-in, and the connector, in the general state can be completely separated, the switch and the connector are the same in the change of the contact state of its contact pair, to achieve the conversion purpose of its connected circuit, and the essential difference is that the connector has only two states of insertion and removal. The switch can realize the conversion of the circuit on its body, and the connector can not realize the conversion on the body, and the contact of the connector has a fixed correspondence.
Terminal is not the same as shielded connector. It is a kind of accessory product used to achieve electrical connection, which is divided into the category of connectors in industry. The terminal is used to facilitate the connection of the wire, which is actually a piece of metal sealed in an insulating plastic, with holes at both ends to insert the wire. Terminal blocks can be divided into WUK terminal blocks, European terminal blocks, plug and pull terminal blocks, etc.
Connector include shielded connector is an indispensable electronic component of all kinds of electrical and electronic systems. It is mainly used for the circuit connection between cables and cables of electrical and electronic equipment, and between cables and devices, which can realize the transmission of signals and electrical energy (power), so its role is very important. Connectors, also known as connectors, are similar in concept. A terminal is a small part on a connector. For example, there are PCB board terminals, nut terminals, spring terminals and so on. Terminal is to facilitate the connection of the wire and the application, it is actually a piece of metal sealed in the insulating plastic inside, both ends have holes can be inserted into the wire, there are screws for fastening or loosening, connected through the terminal, and can be disconnected at any time, without having to weld them or wrap them together, very convenient and fast.
Connector include shielded connector are the core components of the production process of electronic components. The quality of the product is directly related to the stability and performance of the customer’s use, which can play a decisive role, so how to choose the connector connector product? There is a summary from Velle electric company, mainly divided into the following points!
First, the selection of shielded connector design principles
1, according to the cross-sectional area of the wire and the size of the current through the reasonable choice of shielded connector.
2, if the same sheath is used in the same harness, its color must be different.
3, based on the overall coordination of the car’s appearance, the engine compartment should be preferred to choose black or dark jackets.
4. In order to reduce the type and number of sheathing used in wiring harness butt joints, hybrid parts are preferred for easy assembly and fixing.
5, the battery connector (battery clamp) has a taper inside, the taper is 1:9; Battery clips are made of tin-plated copper, galvanized copper or lead-antimony alloy.
6, airbags, ABS, ECU and other terminals with higher performance requirements should be preferentially selected gold-plated parts to ensure safety and reliability.
7, the engine cabin docking sheath, due to the cabin temperature and humidity is too high, corrosive gas and liquid more, need to choose waterproof sheath.
8, the selection of shielded connector should ensure good contact with electrical components, minimize contact resistance, improve reliability. Connectors of double spring compression construction are preferred.
9, different specifications of shielded connector can generally carry the current as follows: 1 series, about 10A; 2.2 or 3 strings, about 20A; 4.8 series, about 30A; 6.3 series, about 45A; 7.8 or 9.5 series, about 60A.
Second, the raw material performance analysis of shielded connector
1. Sheath materials (plastic parts), commonly used materials are mainly PA6, PA66, ABS, PBT, pp, etc., in the design of plug-ins, you can choose different materials according to different needs, you can also add flame retardant or reinforcement materials in plastics according to needs. The actual situation to achieve the purpose of strengthening or flame retardant, such as adding glass fiber to strengthen.
2. The terminal material (copper) and the copper used in the shielded connector are mainly brass and bronze (the hardness of brass is slightly lower than that of bronze), and the proportion of brass is larger. In addition, different coatings can be selected according to different needs.
How can I improve shielded connector performance?
First, the problem of opening the road
1. Use appropriate crimping tools to avoid damage to the crimping cavity and wire;
2. Accuracy of the base, pins and jacks, and concentricity of pins and jacks;
3. The needle material is selected with good mechanical properties and is not easy to bend and deform.
Second, the problem of increasing plugging force and shortening service life of shielded connector
1. The base material is selected with stable size, good stiffness and good strength;
2. Improve the processing accuracy and consistency of the base, pin and jack;
3. Select high-quality coating materials with corrosion resistance to improve plating quality.
Three, the contact resistance increases of shielded connector
1. Elastic materials with good elasticity, hard rigidity, high strength and stress relaxation resistance should be selected;
2. In order to improve the plating quality, the coating of metal materials not only requires good electrical conductivity, but also requires wear resistance and corrosion resistance;
3. Improve processing and assembly accuracy to ensure the correct matching of pins and jacks;
4. Use and operate correctly to avoid forced plugging and straightening.
Fourth, the problem of increasing the shielded connector’s voltage standing wave ratio
1. Cable connectors should be strengthened;
2. Take a variety of measures to eliminate the instability of contact resistance;
3. When inserting and removing, pay attention to the alignment of the plug and socket contacts, and the size of the male and female contacts should be properly matched;
(4) The medium between the inner conductor and the outer conductor shall be made of selective and stable materials;
5. Pay attention to the frequency of use according to the regulations.
5, short circuit and insulation resistance reduction
1. Insulation materials should be selected to withstand environmental stress, moisture resistance, good dielectric properties, good processing properties;
2. Avoid contaminating insulation materials and potting materials during processing, and prevent metal particles or other conductive substances from being mixed into the materials;
3. Clean production, in the process of processing, to prevent conductive metal chips and other particles left between the contact parts;
4. Improve the mold and processing technology to avoid bubbles and cracks in the insulation layer;
5. Correct operation and use, do not forcibly insert or remove, to prevent the needle loose, deformation or damage.
Connector selection elements
There are a few things to consider when choosing a shielded connector
1. Determine the type of shielded connector, whether it is a circular connector or a rectangular one
2, determine the shielded connector installation and connection method
Connection mode: panel, straight through, corner, trunk
3, determine the shielded connector terminal shape:
Male terminal, female terminal
4, the number of cores to the top shielded connector
Series of shielded connector required
5, connector lock withstand the current resistance, voltage
6. Determine the connection mode of the shielded connector.
