Film capacitor - definition and classification Share

The film capacitor is a capacitor using a plastic film as a dielectric, which is a passive electronic component that stores and releases electrical energy in electrostatic form, which can be divided into wound, lamination, fever and no model according to the form of structure, in which the volume Wide application around unusual type


The capacitor is an insulating medium in an insulating medium between the pole metal conductive material and stores and releases electrical energy in electrostatic form, and can function, tun, filter, coupling, rectification, separating DC voltage in the electronic circuit. Bypass, coupling, etc., widely used in a variety of high and low frequency capacitors, is an indispensable base electronic component in electronic lines. The thin film capacitor is a capacitor using a plastic film as a medium.


The film capacitor has a sensing type to be wound on the inner electrode, and the non-inductive type is attached to the end surface mounting wire or terminal electrode. The inductance is small and high frequency characteristics is small compared to the inductance. At the same time, the inductive winding can reduce the loss of the film capacitor and enhance the life of the capacitor. The laminated thin film capacitor is smaller than the wound thickness and the volume and is suitable for small electronic products. The winding type is more suitable for mainstream and pulse circuits, so the winding type is widely used in filtering, corruption, bypass, coupling, and noise reduction of electronic electrical equipment.



Decoupling capacitor: In the electronic circuit, a more stable power supply can be provided, and the reducing element is coupled to the noise of the power supply end, filtering a class of components that interfere with the signal interference.

Filter: The roller wavy of the sawtooth after rectification is smoothed, close to DC.

Coupling: As a connection between the two circuits, the AC signal is allowed to pass and transmit to the next stage circuit.

Bypass Capacitor: The capacitance that is filtered off bypass high-frequency components in AC current of high frequency current and low frequency current.

Chemical foil: The surface area is expanded after electrochemistry or chemical corrosion by electrochemical or chemical etching, and then electrochemically formed into a surface of a layer of oxide film (aluminum dioxide).

Winding: Refers to a process process that wounds into a variety of packages according to certain regularities.

PET: Polyethylene terephthalate is a common resin in life.

PEN: Ethylene glycol ester of polymethyl naphthalate is an emerging excellent polymer, and the chemical structure is similar to PET.

PP: Polypropylene, is a polymer formed by adding polymerization.

PPS: a new high-performance thermoplastic resin.


Film capacitor can be divided into a winding type, a lamination type, inductive type and non inductance.