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Film Capacitors

Film capacitors, also known as polypropylene capacitors, are a type of capacitors used in AC applications. This type of capacitors is made of polypropylene film and foil, providing good temperature and frequency stability and excellent self-healing properties. Film capacitors offer high energy densities, low thermal and electrical losses, as well as low ESR.

The ECW-U2393V16 is a polypropylene film capacitor with a rated voltage of 16V, an internal capacitance of 93µF, and a tolerance of ±20%. It offers a low impedance, low temperature rise, and high capacitance stability. This device is suitable for high voltage AC applications in receivers, television sets, loudspeakers, and etc.

Working Principle

A film capacitor works by storing electrical energy in an electric field and consists of two layers of metal foil separated by a dielectric (insulator) material. When a DC voltage is applied across the capacitor, a static electric field builds up between the two metal layers. This static electric field would store electrical energy and maintain the charge on the metal layers.

When an alternating current (AC) is applied to a capacitor, it will start to charge and discharge continuously. The recharging and discharging process of the capacitor is the basis of its working principle. On each cycle, the voltage across the capacitor will charge the capacitor to its peak value and then, as the current reverses its direction, it will start to discharge towards the ground. Therefore, the main function of the film capacitor is to keep the current flowing when the voltage increases or decreases (it is known as “phase lag”).

Application Field

The ECW-U2393V16 can be used for a wide range of AC applications, such as receivers, televisions, loudspeakers, etc. It can also be used for high voltage rectifiers, voltage regulators, pulse transformers, drive circuits, and etc.

The capacitor can be used as a filter in high voltage power supplies, where a voltage drop is required in order to regulate the output voltage. Additionally, it can also be used as a snubber capacitor in power devices, as it will suppress snubbing of the generating pulse and reduce the current surge. Thus, the capacitor offers low impedance and improved ripple current capability and efficiency.

This film capacitor is also widely used in pulse energy transfer devices, such as PWM controllers and frequency impedance converters. In these devices, the ECW-U2393V16 will filter low frequency signals to reduce EMI/RFI interference, and also provide phase compensation or rectification circuits.

Conclusion

The ECW-U2393V16 is a polypropylene film capacitor with a rated voltage of 16V, which offers good temperature and frequency stability, high energy density, and a low ESR. It is suitable for high voltage AC applications in various devices, such as receivers, televisions, and loudspeakers. Furthermore, this type of capacitor can also be used as a filter, voltage regulator, snubber, and in pulse energy transfer devices.

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