Simple introduction for the cam and groove coupling capacitor

　　The cam and groove coupling capacitance, also called electric field coupling or electrostatic coupling, is a way of coupling due to the presence of distributed capacitance. The cam and groove coupling capacitor is the strong and weak electricity two system through a capacitor coupled isolation, providing high frequency signal pathway, prevent power frequency current into the electric system, ensure the safety of the people.

　　The cam and groove coupling capacitor with a voltage sampling device in addition to the above effect, can also extract the frequency of the voltage supply protection and reclosing, and play the role of voltage transformer.

　　The cam and groove coupling refers to the process of signal from the first stage to the second stage transmission, the one without the general indication is often refers to the exchange coupling. From the circuit, it can always judge the load driving power and the driven load. If the load capacitance is large, the driving circuit to capacitor charge and discharge, to complete signal jump, at the rising edge of the relatively steep, relatively large current, current this drive will absorb the supply current greatly, because the inductance in the circuit, the resistance (especially the inductor, chip pins will produce the current rebound), relative to the normal situation is actually a kind of noise, will affect the normal work of the first stage. This is the coupling.

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