Energy storage capacitor, film capacitor characteristics
In front of us, a detailed analysis of why the super capacitor attention, in fact, the capacitor according to the different media can be divided into many types, such as thin film capacitors, electrolytic capacitors, ceramic capacitors, capacitor paper and so on, in which most of these capacitors, film capacitors and electrolytic capacitors are often used in audio equipment. Electrolyte capacitor is mostly used in the need for a large amount of capacitance, the film capacitor is different, it is generally used for analog signals and other places. The electrode film capacitor is a metal foil, metal foil and plastic film overlapped cylindrical capacitor made of rolled. So, what are the characteristics of the film capacitor?
Thin film capacitor has many excellent properties, so it is a kind of capacitor with excellent performance. Its main characteristics are as follows: polarity, high insulation resistance, excellent frequency characteristics (frequency response), and the medium loss is very small. Based on the above advantages, it is widely used in analog circuit. Especially in the signal connection part, must use the frequency characteristic is good, the medium loss extremely low capacitor, can ensure the signal in the transmission, does not have the too big distortion situation to occur. Among all the plastic film capacitors, polypropylene (PP) and polystyrene (PS) capacitors have the most significant characteristics, of course, the price of these two kinds of capacitors is relatively high. However, in recent years, in order to improve the sound quality of audio equipment, the material has become more and more advanced, the price factor is not the most important, so in recent years, PP PS has been used in capacitance and capacitance frequency and number of audio equipment is more and more high. Readers can often see a certain brand of equipment, known as the number of the name of a certain brand of PP quality or PS capacitor, in order to do in the voice quality of the endorsement, the reason is in this.
The usual thin film capacitor is made of aluminum foil as electrode and plastic film, which is formed by winding. But another film capacitor and a manufacturing method, called Film Metallized, the system is in the plastic film on a thin layer of vacuum evaporation of metal as the electrode. Thus, the thickness of the electrode foil can be omitted, and the volume of the unit capacity of the capacitor can be reduced, so the film capacitor is easier to be made into small size and large capacity capacitor. For example, the common is the MKP capacitor, metallized polypropylene film capacitor (Metailized Polypropylene Film Capacitor) said, MKT is a polyethylene capacitor (Metailized Polyester) said.
Thin film capacitors used in the metal film are poly ethyl ester, polypropylene, polycarbonate, etc., in addition to the winding type, there are stacked type. This type of metallized film capacitor has a so-called self healing action (Self Healing Action), which assumes that small part of the electrodes because the electric medium fragility caused by short circuit, short circuit caused by electrode metal part around, due to static electric energy or short circuit current with time triggered capacitor. And the larger and the solution evaporation recovery insulation, the capacitor again returning capacitor effect.
The above is the characteristics of the film capacitor, with the development of technology, the market demand of film capacitor will further show the trend of rapid growth.
