B81122C1152M

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Film Capacitors

Film capacitors, otherwise known as AC fan capacitors, are one type of capacitor used in the electrical and automotive engineering fields. They are designed for withstanding both large levels of AC voltage and currents. The general design consists of an electrostatic dielectric layer made of polyester, polypropylene, or Mylar film sandwiched between two metal electrodes. The metallic layers can be made of either aluminum foil or copper foil.

B81122C1152M Application Field

The B81122C1152M is a film capacitor developed by Siemens, which is suitable for a variety of automotive applications. This type of capacitor is used in automotive applications ranging from climate control systems to car alarms. It is also suitable for applications requiring high temperature stability, such as automotive charging systems. Besides, B81122C1152M is used in the DC output circuit of the DC-DC power converter.

Working Principle

A film capacitor consists of two metallic layers which are separated by a dielectric layer. The dielectric works to store the charge, while the metallic layers act as an electrolyte to distribute and transfer the charge. When voltage is applied to the electrodes, a current flows through the dielectric, and the electric field creates an ionic polarization, resulting in a charge separation. As a result, a potential different is created and the capacitor stores the charge given to it.

Advantages and Disadvantages

Film capacitors offer advantages over other types of capacitors, such as stability, high temperature capability, long life, and the ability to withstand vibration and shock. However, they also have some disadvantages, such as low capacitance for the same size, limited ripple current capability, and high cost. In comparison to other capacitor types, film capacitors are most suitable for applications requiring high temperature, humidity, and vibration.

Conclusion

In conclusion, the B81122C1152M film capacitor developed by Siemens is a high quality device used in a variety of automotive applications. Its main advantages are high temperature stability and long life, while its disadvantages are low capacitance for the same size and high cost. It is suitable for applications requiring high temperature, humidity, and vibration.

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