WEE Technology Company Limited - WEE are Capacitors Specialist

1. Structure

Plastic film capacitor is a kind of capacitor with metal foil as electrode, which is overlapped with polyethylene, polypropylene, polystyrene, polycarbonate and other plastic films from both ends, and is wound into a cylindrical structure. According to the type of plastic film, they are called poly (ethyl ester) (Mylar), polypropylene (PP), polystyrene (PS) and polycarbonate.

 2. Basic parameters

(1) Rated DC voltage: DC voltage allowed to be applied continuously in the whole temperature range.
(2) Dielectric strength: the voltage that the dielectric of a capacitor can withstand, which is higher than the test voltage.
(3) Rated AC voltage: the effective value of AC voltage that can be continuously applied when the capacitor works under AC voltage.
(4) Test voltage: the voltage applied to the capacitor during the factory type test, generally 1.5 ~ 2 times, lasting for 2 minutes or 500 hours.

3. Function

(1) The function of film capacitance is the same as that of all capacitors, which is to hold the charge.
(2) But compared with other common capacitors, thin film capacitor is a kind of excellent capacitor because of its many excellent characteristics. Its main characteristics are as follows: non polarity, high insulation impedance, excellent frequency characteristics (wide frequency response), and small dielectric loss.
(3) In this case, the short circuit caused by the short circuit of the capacitor is caused by the short circuit of the metal electrode Melting and evaporation to restore insulation, so that the capacitor again restore the role of the capacitor. That is to say, it can heal itself instantly.

 4. Working principle

The working principle of thin-film capacitor is the same as that of ordinary capacitor. It stores electric energy by storing charge on the electrode. It is usually used together with inductor to form LC oscillation circuit. The working principle of capacitor is that the charge will move under force in the electric field. When there is a medium between conductors, it will hinder the charge movement and make the charge accumulate on the conductor, resulting in the accumulation and storage of charge.

 5. Advantages

Thin film capacitor is a kind of excellent capacitor because of its many excellent characteristics. Its main characteristics are as follows: non polarity, high insulation impedance, excellent frequency characteristics (wide frequency response), and small dielectric loss. Based on the above advantages, thin film capacitors are widely used in analog circuits. Especially in the part of signal cross connection, it is necessary to use capacitors with good frequency characteristics and very low dielectric loss, so as to ensure that the signal will not have too much distortion during transmission. Thin film capacitors are widely used in household appliances, lighting, industry, photovoltaic and wind power generation, new energy vehicles and other fields because of their excellent characteristics, such as good safety, high withstand voltage (single working voltage can even reach thousands of volts), non polarity, high insulation impedance and wide frequency response.