Farad Capacitors

In the meter-kilogram-second system of physical units, the farad capacitors is a measure of electrical capacitance (the capacity to store an electric charge). It is named in honor of the English scientist Michael Faraday. When one coulomb of energy alters the potential between the plates by one volt, the capacitance of a capacitor is one farad.

farad, unit of electrical capacitance (ability to hold an electric charge), in the metre–kilogram–second system of physical units, named in honour of the English scientist Michael Faraday. A farad (F) is the standard unit of capacitance in the International System of Units. It indicates the ability of a substance to hold an electric charge. The value of most electrical capacitors is expressed in farad capacitors, microfarads (µF) or nanofarads (nF).

Different sizes of capacitors are available, usually starting at 1 Farad. According to standard guidelines, 1 farad capacitors of capacitance should be added for every 1000 watts RMS of system power. It should be noted that using more capacitance than recommended by this rule is not harmful, and many systems employ 2 or 3 farads per 1000 watts RMS.

When the farad capacitors in a capacitive circuit rises, the capacitive reactance XC falls, increasing the circuit current, and vice versa. Capacitive reactance is a type of resistance in oral or verbal communication. Circuit current drops when resistance rises and vice versa.

Feature of farad capacitors:

1. High stability of farad capacitors and DF versus temperature and frequency;
2. High voltage and long-term ability;
3. High pulse rise rate(du/dt) and suitable for large current circuit;

Applications of farad capacitors 

Farad capacitors, also known as supercapacitors or ultracapacitors, are electronic components that store and release electrical energy quickly. They have a higher power density than traditional capacitors and can hold much more energy than electrolytic capacitors.

Some common applications of farad capacitors include:

1. Energy storage: Farad capacitors can be used to store energy and provide short bursts of power when needed. This makes them useful in applications such as backup power supplies, hybrid vehicles, and uninterruptible power supplies (UPS).
2. Power conditioning: Farad capacitors can be used to smooth out fluctuations in voltage and current, making them useful in applications such as power conditioning for renewable energy sources.
3. Pulsed power applications: Farad capacitors can provide high peak currents and voltage pulses for applications such as pulsed lasers, electromagnetic railguns, and pulsed power supplies.
4. Regenerative braking: Farad capacitors can be used in regenerative braking systems to capture and store energy from a vehicle’s braking system, which can then be used to power the vehicle’s electrical systems.
5. Electronic circuits: Farad capacitors can be used in electronic circuits for applications such as filtering, decoupling, and energy storage.

Overall, the high power density and energy storage capabilities of farad capacitors make them useful in a wide range of applications where fast, efficient energy storage and release is required.

Specifications of  farad capacitors

Dielectric: Polypropylene film

Electrodes:  Aluminum foil as outer electrodes and vavuum evaporated metal layer as inner series electrode

Coating: Epoxy resin coating

Leads: Radial leads of tinned wire

Reference standard: IEC 384-17 GB 14579-1993

Climatic catalogue: 40/85/21

Capacitance versus rated voltage:

0.001µF-0.10µF/1000VDC; 0.001µF-0.047µF/1600VDC;

0.001µF-0.022µF/2000VDC

Capacitance tolerance: M ±20% K ± 10% J ± 5%

Dissipation factor (tangent of loss): ≤0.10％ (at 20℃ , 1KHz)

Voltage-proof:

2.0*UR Unit: VDC (1minute at 20℃ )

Insulation resistance:

C ≤0.1μF, IR ≥30,000mΩ, C>0.1μF, IR*C≥5000S (1 minute at 20℃ and RH≤65%)