170224J250HC

Film Capacitors

"170224J250HC" Applications and Working Principles

Film capacitors are capacitors constructed using metallized or metalized film as the dielectric. Film capacitors can be constructed of any type of plastic film including polyester (PET or Mylar®), polycarbonate, polypropylene, polyethylene naphthalate (PEN), polysulfone, polystyrene, and many other types of film. Film capacitors feature high dielectric strength, meaning the insulator is able to suspend a charge in spite of the high voltage that will be present. They also boast a wide temperature range, low ESR, high insulation resistance, and low losses. This makes them ideal for use in applications such as power supplies, high voltage, filtering, and resonant circuits.

170224J250HC

The 170224J250HC film capacitor is a two-winding, air-core, self-healing capacitor. It is designed to be used in applications where standards for high voltage/high temperature, high reliability, and low parasitic elements are the most important considerations. Its high voltage rating (up to 10kV) makes it an ideal choice for applications in power systems, and its low series resistance (ESR) helps minimize power consumption. It also has excellent protection against high-frequency interference and excellent temperature and humidity tolerance. Many film capacitor models are made using polyethylene terephthalate (PET) or polypropylene (PP) metallized film.

Working Principle

A film capacitor is a device that stores electrical energy. It has two electrical conductors (the plates) separated by an insulating dielectric material. When a voltage is applied across the plates, an electric field is created, resulting in a buildup of electric charge on the plates. This buildup of charge is stored energy, which can be released by shorting the plates together. As the plates are shorted together, the capacitor discharges its stored energy in the form of a current.

The dielectric material that separates the plates is important for the operation of the capacitor. It creates an electric field between the plates, which can be increased or decreased according to the voltage applied. This electric field creates the capacitance of the device, which is a measure of how much charge can be stored in the capacitor. The capacitance is determined by the surface area of the plates, the distance between them, and the permittivity of the dielectric material used.

Film capacitors are well-suited for applications that require high voltage operation, low ESR, and reliable performance over a wide temperature range. They are also used in applications such as DC blocking, AC power factor correction, EMI filtering, and snubber circuits.