BFC237352105

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Film Capacitors

Film capacitors, also referred to as polyester capacitors, are polarized capacitors with a plastic film or metal oxide film as the dielectric material. They feature very low equivalent series resistance (ESR) and are capable of withstanding high working voltages. Film capacitors offer good stability over time and temperature, as well as excellent dielectric absorption. They are designed for use in power supplies, charge pumps, switch-mode power supplies, interstage filters and electronic dc motors.

BFC237352105 Application Fields

The BFC237352105 high voltage radial film capacitor is a generic type of capacitor, used for numerous applications across various industries, such as:

• Power supplies
• Switching power supplies
• Voltage regulation units
• Electric vehicles
• High voltage AC/DC converters
• UPS systems
• Medical equipment
• Industrial automation applications

Working Principle

Electrical energy can be stored in a film capacitor. Basically, two metal electrodes are brought into contact with a dielectric film material. By applying an electrical current across the terminals of the capacitor, energy is stored between the electrodes in the form of an electric field. The electricity stored in this electric field can then be discharged when the applied voltage is switched off.

A film capacitor’s capacitance is given as measured at 1 kHz and 25°C. Due to differences in dielectric, self-inductance, and distributed capacitance, capacitors will respond differently to the same level of voltage that are applied to them at various frequencies. At a higher frequency, the capacitance will be smaller, whereas at a lower frequency, the capacitance will be larger. This is why it’s important to use the correct capacitor for the intended application.

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