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The structure and characteristics of eight kinds of capacitors

 Capacitor is the electronic components used in electronic equipment, all aspects of our life all cannot do without the electronic products and the capacitance of the, in any place can see the figure of the capacitor. The structure and characteristics of several common capacitors by the brief introduction, for your reference.

Tantalum niobium electrolytic capacitors tantalum or niobium: it used for the positive electrode, with dilute sulfuric acid with liquid as the cathode, with tantalum or niobium oxide film formed on the surface of the medium. Its characteristics are: small size, large capacity, stable performance, long service life, high temperature insulation resistance, good performance, with higher requirements on the equipment.

Aluminum electrolytic capacitors: it is consists of aluminum cylinder as the anode, which is equipped with liquid electrolyte, insert a sheet bending of aluminum strip anode made, should be treated by DC voltage, anode sheet to form a layer of oxide film as a dielectric. It is characterized by its large capacity, but large leakage, poor stability, positive and negative polarity, suitable for power filter or low frequency circuit, the use of positive and negative, do not reverse.

Ceramic capacitors, ceramic medium, spraying on both side of the ceramic substrate layer of silver, then burned into the silver film as electrode is made. Its characteristics are: small size, good heat resistance, low loss, high insulation resistance, but the capacity is small, suitable for high frequency circuit. Ferroelectric ceramic capacitor capacity is larger, but the loss and temperature coefficient, suitable for low frequency circuit.

Mica capacitors: with metal foil or in mica spraying a layer of silver do electrode plate, plate and mica layer stacked together, die casting in bakelite powder or sealed and fixed in epoxy resin is made. Its characteristics are: low dielectric loss, high insulation resistance, low temperature coefficient, suitable for high frequency circuit.

In the same structure: film capacitor capacitor, dielectric is polyester or polystyrene. Polyester film capacitors, high dielectric constant, small volume, large capacity, good stability, suitable for bypass capacitor. Polystyrene film capacitor, low dielectric loss, high insulation resistance, but the temperature coefficient, can be used in high frequency circuit.

Paper dielectric capacitors: two pieces of metal foil as electrode sandwiched between thin capacitor paper, rolled into a cylindrical shape or a flat cylindrical core and then sealed in the metal shell or insulation material shell made. It is characterized by smaller volume and larger capacity. But the inherent inductance and loss is relatively large, suitable for low frequency circuit.

Metallized paper capacitor: structure and basically the same as in paper dielectric capacitors, it is in the capacitor paper covered with a layer of metal film to generation of metal foil, small volume, capacity is large, the general for low frequency circuit.

The oil impregnated paper capacitors: it is the capacitor immersed in the specially processed oil, can increase the pressure. It is characterized by large capacity, high pressure, but a large volume. In addition, in the practical application, the first to according to the different way to choose different types of capacitor; the second to considering the capacitors nominal capacity, allowable error, the voltage value, leakage resistance and other technical parameters; the third for the positive pole and the negative pole of the electrolytic capacitor, a positive pole welding don't answer.

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