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Film Capacitors

Film capacitors, sometimes known as polyester capacitors, are capacitors which use plastic films as the dielectric material. They enjoy a wide operating temperature range and stability. There are a variety of types, such as polypropylene (PP), polycarbonate (PC), polyethylene naphthalate (PEN) and polyethylene terephthalate (PET). Film capacitors come in three varieties: axial, radial and surface mount.

BFC2373FL564MF application field and working principle

Application Field

BFC2373FL564MF film capacitors are widely used in power electronics, renewable energy, automotive, LED lighting, avionics and telecoms applications. They are usually specified for applications requiring frequencies up to 3 kHz, such as low-loss filter circuits, motor drives, and high-frequency switching power supplies. These devices feature both low ESR and low ESL and provide high electrical stability over a wide operating temperature range.

Working Principle

In a BFC2373FL564MF film capacitor, a sandwiched dielectric material (usually specified as polyethylene terephthalate) is held between two metal electrodes (usually aluminum or steel) which create an electrical field. This field produces a capacitive action where any charge entering the capacitor is opposed by an opposite charge. As the voltage is increased, an electric field is created which forces the charge across the opposite side of the capacitor. When there is an imbalance of positive and negative charges across the capacitor, the charge will move from one side to the other, inducing a current which is stopped when both sides are balanced. The capacitor will then charge and discharge depending on the levels of voltage applied.

Conclusion

BFC2373FL564MF film capacitors are a type of capacitor with many beneficial characteristics, such as a wide operating temperature range and low ESR and ESL. These capacitors are ideal for use in many applications, including power electronics, renewable energy, automotive, LED lighting, avionics and telecoms. Their working principle is simple, but effective, involving electric fields and the transfer of charge.

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