BFC237165823

Film Capacitors

Film Capacitors, such as BFC237165823, are passive two-terminal electrical components used to store energy in an electric field. Capacitors are widely used in electronic circuits to block direct current while allowing alternating current to pass, to filter out interference, and to stabilize voltage. Additionally, capacitors are commonly used to store energy temporarily, such as in power-supply filters, motor start capacitors, and tuning circuits.

Application Field

• Power Supplies
• Voltage Multipliers
• Radio Frequency Circuits
• Tuning Circuits
• Switch Mode Power Supplies
• Motor Start Capacitors

Film capacitors are an attractive choice for use in power-supply circuits, voltage multipliers, or other applications where strong ripple currents and high-voltage stability are required. Film capacitors can be soldered into place in electrical circuits, providing easy installation and are perfect for applications such as radio-frequency circuits, switch mode power supplies, and motor start capacitors.

Working Principle

A film capacitor consists of two metal plates separated by a film dielectric, such as polypropylene, polycarbonate, polyester, PET, Teflon, or PEN. During operation, an electric current will pass through the capacitor, creating an electric field between the plates. The dielectric layer will gradually store electric charge on both plates which continues to increase the electric field until a maximum value is reached. Once the electric field reaches its maximum value, the capacitance will have reached its maximum value.

The capacitance of the film capacitor will remain constant up to a certain voltage, at which point the electric breakdown of the dielectric will occur. This results in a sudden decrease in the capacitance, usually to a very low value. The breakdown voltage is dependent on the type of dielectric used and the thickness of the dielectric layer between the plate and the dielectric material.

Once the electric field between the two plates has reached its maximum value, the capacitance remains as long as the voltage of the capacitor remains constant. However, if the voltage changes, the capacitance of the capacitor will also change. If the voltage increases the capacitance increases and vice versa.

A film capacitor is also subject to dielectric absorption. This is a process whereby the energy stored in the capacitor increases over time due to the leakage of current across the dielectric layer. Generally, the capacitance of the film capacitor will increase as the current leaks across the dielectric layer.

Conclusion

BFC237165823 is a type of film capacitor, a two-terminal electrical component used to store energy in an electric field. Film capacitors are attractive for use in many circuits, such as power-supply circuits, voltage multipliers, and radio-frequency circuits, and are perfect for applications such as switch mode power supplies and motor start capacitors. Film capacitors work by creating an electric field between two metal plates separated by a film dielectric. Once the electric field reaches a maximum value, the capacitance will remain constant until the voltage of the capacitor changes. Film capacitors are also subject to dielectric absorption, which is a process whereby the energy stored in the capacitor will increase over time.