Refers to the use of two pieces of metal foil in electrode, caught in a very thin dielectric, rolled into a cylinder or flat cylindrical core, medium is polyester, polyester film capacitors, high dielectric constant, small size, large capacity, good stability, suitable for the bypass capacitor.
Prominent advantages: the precision of the thin film capacitors, loss, insulation resistance, temperature characteristic, reliability, and to adapt to the environment indicators are better than that of the electrolytic capacitor, two kinds of capacitance of the ceramics.
Prominent disadvantages: price ratio and volume ratio capacity is greater than the above two kinds of capacitance.
Purpose: in all kinds of dc or low frequency pulse circuits.
Suitable for use as the bypass capacitor.
A polyester capacitor the simplest structure can be made of two metal plates sandwiching a layer of insulating medium.
In two metal plates (
Add a electric pressure between, plate can store charge.
The size of the storage charge and the voltage between plate and plate area (
Direct proportion, and is inversely proportional to the distance between the plates.
Q = CV is C = Q/V = epsilon 4 PI S/d (
See the film capacitor theory calculation and correction. )
Storage charge on the plate;
Plate between the voltage (
Dielectric permittivity (
Polyester film is 3.
2 0, polypropylene film.
Metal plate area (
The distance between the plates (
Kinds of polyester capacitor phyletic and various, according to its regulatory can be divided into fixed capacitor, fine-tuning capacitor, variable capacitor three;
According to the medium with gas medium, inorganic solid medium, organic solid medium, electrolytic medium, such as liquid medium and complex medium capacitors.
Among them: gas condenser includes air, vacuum, inflatable capacitor;
Inorganic solid capacitors including mica, ceramic and glass glaze capacitor;
The organic solid capacitors including organic film and paper capacitor;
Electrolytic capacitor consists of aluminum electrolysis, niobium and tantalum electrolytic capacitor electrolysis;
Liquid dielectric capacitor includes a variety of organic oil and liquid capacitor;
Composite dielectric capacitor including organic compound, inorganic compound, solid solid made of organic and inorganic solid composite solid capacitors.
In market applications are mainly three types of capacitors: ceramics capacitors, film capacitors, electrolytic capacitors.
The three types of capacitor accounts for over 99% of the market volume.
The characteristics of 1.
Small volume, light weight;
Good stability, high reliability;
Leads directly welded to electrodes, low loss;
Inductive construction, polyester film and epoxy resin coating.
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