QXK2E104KTP7ZHFJ

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Film Capacitors

• QXK2E104KTP7ZHFJ application field and working principle

QXK2E104KTP7ZHFJ, commonly known as a film capacitor, belongs to the family of plastic dielectric capacitors. It is widely used in a variety of electronic equipment for applications such as power supply stabilization, signal frequency separation, noise filtering, and energy storage. Film capacitors are typically composed of polypropylene or polyester (PET) layers that are wrapped together in an air gap. The two metal electrodes, generally aluminum or zinc, are then attached to the outer surface of the film layers. Generally, the dielectric film layers are thicker and more closely spaced than ceramic capacitors, which allows for higher capacitance values and lower losses.

As far as working principle of this type of film capacitors is concerned, it should be noted that a network of polyester or polypropylene film and foil layers may be interleaved so that each successive layer has an opposite orientation. During operation when an external potential is applied to the device, an electric field is generated. The electric field then causes the charges to move across the dielectric films and generates a (dielectric) polarization of the charge carriers. This results in the formation of electric dipoles that comprise the capacitance element of the device.

The value of capacitance corresponds to the number of layers and can be adjusted by changing the amount of foil and film used. The net result is a highly reliable and stable capacitance that remains constant even as temperatures and AC vs. DC situations change. Additionally, the dielectric loss, ESR (Equivalent Series Resistance) and leakage of film capacitors are negligible compared to other types of capacitors, leading to high power stability and efficiency.

Film capacitors are mainly used in applications like power supplies, rectifiers, coupling, interference suppression, timer, etc., in the frequency range of 8Khz-88Mhz and above. Some of their primary advantages over other capacitors include higher surge capability, lower leakage current, linear voltage response, faster discharge time, higher resistance to temperature, and more precise capacitance values.

All in all, the QXK2E104KTP7ZHFJ film capacitor is among the earliest plastic film capacitors and can be found in almost all electronic devices. Its reliability, dependability, and accuracy ensure that it is favored in a variety of applications. The principle behind its operation is that of a network of polyester or polypropylene film and foil layers that activate when an external potential is applied, leading to the formation of electric dipoles, and a higher capacitance value.

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