Development status of metallized film capacitors

The development status of metallized film capacitors in our country: Since the advent of metallized film capacitors produced by hand in the 1960s, China's metallized film capacitors have experienced three developments.

In the 1980s, the introduction of technological transformation from manual work to stand-alone automation was completed with the opportunity of color TV production.

In the 1990s, the "small, small, light, and thin" electronic machine was used to complete the technical transformation of metallized film capacitors (winding type and metallized laminated type); The reliability requirements have undergone technological transformation based on safety capacitors. In recent years, metallized film capacitors have ushered in the fourth development trend of joint-stock and private investment.

Advantages of metallized film capacitors: metallized polyester film winding, non-inductive structure epoxy resin encapsulation, CP line unidirectional extraction self-healing performance, high insulation resistance, stable capacitance. Applicable to DC and pulsating circuits, widely used in various electronic and electrical equipment, such as filtering, blocking, bypassing, coupling and noise reduction.

The metallized film capacitors have a ripple current capability that can be ten to several times higher than the rated ripple current of the same capacity aluminum electrolytic capacitors. In order to achieve higher current withstand capability, aluminum electrolytic capacitors usually use larger capacity to meet the requirements. Larger capacity is an unnecessary waste of cost and installation space. Therefore metallized film capacitors are very demanding in the market.

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