Connector function application: signal transmission
Signal transmission can be divided into two categories: analog signal transmission and digital signal transmission. Regardless of the analog or digital signal connector, the required function should primarily protect the integrity of the transmitted voltage pulse signal, which should include the waveform of the pulse signal and its amplitude. The data signal is different from the simulated signal at the pulse frequency. The pulse transmission speed determines the maximum frequency of the protected pulse. The transmission speed of the data pulse is much faster than some typical simulated signals. Some pulses are in the connector. The transmission speed is close to the range of one billionth of a second. In today's microelectronics field, the signal connector is usually treated as a wire because the wavelength associated with the frequency that grows so fast is comparable to that of the connector. size of.
When the connector or an interconnect system such as a cable assembly is used for high speed data signal transmission, the corresponding description of the connector performance changes. It is especially important to replace the characteristic impedance of the resistor and the crosstalk in the interconnected system. Controlling the characteristic impedance of the connector becomes a major trend, and crosstalk is controlled in the cable. The characteristic impedance is so important in the connector that the geometry of the resistor is difficult to achieve completely uniform, and the connector size is small, and the possibility of crosstalk must be minimized. In the cable, the control of the geometry is easier to implement, and the characteristic impedance is also easy to control, but the length of the cable may cause potential crosstalk.
Connector function application: power application
As mentioned earlier, the electrical connectors mentioned in the context are required to transfer power. Usually the voltage is very low. Commonly used are two power transfer methods: dedicated to high levels of current power contact transfer and parallel multi-turn signal contact. Each of them has advantages and disadvantages.
There are two differences between power transmission and signal transmission. The first, and most obvious, is used to deliver higher currents. The current delivered by the signal usually does not exceed 1 amp, and it does not exceed a few amps at most, and the current transmitted by electricity can reach tens or even hundreds of amps. The second point is the temperature rise due to Joule heat caused by the current. The Joule heat generated by the signal contact process is similar to the surrounding temperature. Conversely, the ratio of power transmission is based on an increase in temperature, and an increase in temperature produces a corresponding ratio current. A 30 degree temperature rise is usually used as a standard for current ratios.
Therefore, in order to meet the stability requirements of current rating and performance, it is necessary to control Joule heat, which requires consideration of signal transmission while also considering the transmission of electricity. Especially for terminals with high resistance, the Joule heat is an important factor that must be minimized, and the resistance of the contact surface must also be minimized to minimize the heat generated. From the viewpoint of material selection, of course, a terminal having a high conductivity or a large cross-sectional area is selected to reduce the electric resistance. In addition, increasing the transmission voltage or increasing the contact area can also reduce the resistance of the contact portion.
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