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Home » News » industry information » Film capacitors work in AC

Film capacitors work in AC

Views: 0     Author: Site Editor     Publish Time: 2018-09-22      Origin: Site

The weather is getting colder, and the capacitor market is starting to catch fire. When you are frantically purchasing capacitors, don't forget to understand the parameters and working principle of the capacitors. Knowing these things clearly can choose the right capacitors and less detours. Let me talk about the work of the film capacitor in AC.

 

The simple capacitor is composed of the plates at both ends and the insulating dielectric in the middle. Under the premise of not exceeding the breakdown voltage of the capacitor, the plate will be charged after energization, forming a voltage (potential difference), but because the middle is an insulating substance, it is It is not electrically conductive, so the capacitor will have the characteristics of AC and DC blocking. This is the nature of the capacitor. In a DC circuit, the film capacitor is equivalent to an open circuit.

 

Any substance is relatively insulated. When the voltage at both ends of the substance is increased to a certain extent, the substance can be electrically conductive. We call this voltage the breakdown voltage, and so is the capacitance. After the capacitor is broken down, it is not an insulator. However, the general capacitors work below the breakdown voltage. Such voltages are not seen in the circuit and can be viewed as insulators.

 

In the AC circuit, because the direction of the current changes with time, the process of charging and discharging the film capacitor is time-consuming. At this time, a changing electric field is formed between the plates. In fact, the current is passed through the field. The form passes between the film capacitors, and this electric field is also a function of time.


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