Different Types of Capacitors [with Images]
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You can find capacitors in almost all types of electronics today. This is the oldest electronic component with a history of about 250 years. The capacitor (or condenser) is an energy-storing device, a sort of a little rechargeable battery. It contains at least 2 electrical conductors (or plates) that are separated by a dielectric (or insulator).
The conductor part of the capacitor could be metal or aluminum foil. A dielectric used in capacitors could be anything from glass to ceramic, plastic film, paper, and even air. It is important to know what types of capacitors are out there in order to find the one that suits your needs.
Some types of capacitors include:
Here is a list of the capacitors that are most commonly used:
- Electrolytic capacitor
- Paper capacitor
- Mica capacitor
- Film capacitor
- Un-polarized capacitor
- Ceramic capacitor
- Tantalum capacitor
The following video is a good explanation (with actual heating tests) on how to choose a capacitor for its intended application:
One of the distinctions between capacitors is that they could be either be fixed or variable. The majority of capacitors on the market right now are fixed capacitors and this is what I will explain in the sections below.
1. Electrolytic capacitors
For the other electrode, a solution of semi-liquid that is in paste or jelly is used. Its plates are of thin oxide layers that are brought electromechanically in manufacture with the film’s thickness, and it is below ten microns.
Its insulating film is thin which can increase the capacitance for practical size. Both plates have a very small distance in between.
Its terminals should be of correct polarity. Incorrect polarization can break the layer of oxide and can damage it permanently. These have correctly mentioned polarities, to avoid this damage.
Its use is in the Direct Current (DC) power supplies, as they have a large capacity and are efficient in reducing the voltage ripples. Its applications are coupling & decoupling.
Its disadvantage is that it has low voltage ratings due to its polarization.
2. Paper capacitors
Its foils are attached to the exterior load. The range of capacitance of this capacitor is 0.001-2uF. Its voltage is relatively high, up to 2000Volts.
3. Mica capacitors
This is a stable, reliable, low-loss capacitor that uses a collection of usual (Mica) minerals. These minerals have good resistance to high temperatures and chemicals.
Dielectric is used by the silver capacitors that is a type of Mica capacitor. It has two types that are:
- Clamped capacitors
- Silver capacitors
Clamped capacitors are outdated due to their inferior features. The silver ones are made by metal coated mica sheets, and it is then placed in epoxy to guard the environment.
Mica ones are electrically, mechanically, and chemically due to their crystalline and layered structure. These are used at very high frequencies and have a very low loss.
The most common mica capacitors are made from Phlogopite mica and Muscovite, with the last one considered to be better due to its electrical properties. Phlogopite mica is also known to have a high thermal resistance.
4. Film capacitors
Electrons are assembled and added to guard against environmental factors. Its different types are:
The difference in all of them is the use of material and different applications. Its features are small inductances, low cost, and stability.
The PTE film is heat resistant and used in military and aerospace technology.
5. Unpolarized capacitors
They come in two types:
- Plastic foil
- Electrolytic unpolarized capacitors.
The plastic foils are un-polarized in nature. The unpolarized capacitors need AC uses in the parallel or series power supply.
Its examples include pf correction assemblies and speaker filters. In its uses, a huge Alternating Current (AC) voltage is given.
6. Ceramic capacitors
Its different geometries are barrier layer and ceramic tubular. These are outdated due to their electrical features, parasitic effects, and size.
The two most common types are:
- Ceramic disc.
These capacitors have a great frequency response due to parasitic effects such as inductance and resistances.
7. Tantalum capacitors
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