What must be considered for connector type selection?

I. Connector model selection must be considered which points.1 cable current-carrying capacity: the connector cable current-carrying capacity refers to the connector can not be installed in a larger rated value of the temperature outside of the large electrical total flow, and the temperature of the rated current generally include the conductive temperature rise and the natural environmental temperature. In the choice of switching power supply data signal connector, more concerned about the connector's cable current-carrying capacity, the choice of quotas to adjust the design scheme, pay attention to the foot position in the middle of the insulating layer of the resistance to compression.2 construction specifications: the size of the connector is critical. Connection in the commodity has a certain indoor space limitations, especially the double board connector, can not intervene with other parts. According to the application of indoor space, the mounting part to choose the appropriate mounting method (installation before and after installation, mounting and fixing methods including bolts, screws, circlips, or the connector itself quick lock, etc.). and appearance design (direct, copper pin, T-shape, ring, square).3 Matching Resistance: The basic concept of matching resistance for electronic circuits is that the load will reach high power when the input resistance is equivalent to that in a switching power supply. Some data signals have characteristic impedance regulations, especially RF signals, the matching resistance is more stringent. Characteristic impedance mismatch will result in a reflective surface of the data signal, thus affecting the data signal transmission. Generally speaking, there is no special requirements for the characteristic impedance of the connector. 4 shielded off: along with the development trend of communication equipment, EMC it becomes more and more important plug-in must have a plastic shell, the cable must have a shield. The shield should be connected to the plastic shell of the plug-in to achieve the actual effect of shielding. Injection molding processing methods can also be selected, the power plug part of the copper skin packaging, cable shielding layer and copper welding.5 anti-miscontact plug: in all structures of the contactor teeth together before the shell must be accurately positioned. After the electrical contactor shell is accurately positioned, the pin-plug contactor can contact the plug contactor or insulation layer mounting plate surface, to ensure that the contactor to get the proper direction, will not be damaged; Otherwise, in the whole insertion process is prone to pin-plug plate bending.6 credibility: connectors are used to connect the data signals, so the connection part must be more credible. For example, facial contacts are generally better than point contacts, and pin eyes are better than leaf springs.

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