Metallized film capacitance application

market still has large space

Metallized film capacitance has excellent electrical properties, high stability and long life, can satisfy all sorts of different applications. At present, the capacitor manufacturer has been constantly improve the product, with the smaller size package provided more electric capacity.
　Capacitance manufacturers to specific to, by choosing appropriate application of dielectric to optimize metallized film capacitance properties. For example, polyester film in ordinary applications show good characteristics, has the high dielectric constant (in the metallized film capacitors for the most of unit volume electric capacity), high insulation intensity, self recover characteristics and good temperature stability. In all kinds of film capacitors ，polyester capacitors in moderate cost realized the best volume efficiency, but also is decoupling, blocking, bypass and noise suppression, dc application of the most popular choice.
　 But using the metallized polypropylene film manufacturing the capacitance has low dielectric loss, high insulation resistance, low dielectric absorption and high insulation intensity properties, is a kind of lasting and save space solution, it is also very good long-term stability. These characteristics make metallized polypropylene film capacitor become exchange input filter, electronic ballast and buffer circuit applications such as an important option. Polypropylene film capacitor can provide 400 VAC or higher rated voltage, and meet the industrial application of professional equipment and three requirements. They are also used to switch power supply, jian frequency and filter circuit, as well as the energy storage and sampling and keep application and so on.
　In addition, AC and pulse capacitor can exist for the application of steep pulse optimization, such as electronic ballast, motor controller, switch mode power supply，CRT TV and display or buffer. These applications generally USES have low dielectric loss of double metallized polypropylene film structure, can endure high frequency under the conditions of high voltage and high pulse load applications.
　 To design product choose when film capacitors the principles usually is simple. For example, the electric power supply EMI filters, product using common topology, it is easy to selected capacitance value. Placed in the trunk and between the midline phase capacitor, no upper limit theory X, but usually in 0.1 micro method and 1.0 micro between method. Placed in the trunk or midline and chassis grounding of capacitor, Y between need to choose the electric capacity as small as possible, so that the flow of ground leakage current minimum. For most design for, 4700 pf is the ideal. These devices must meet the applicable to connect with trunk of the components of security and performance standards, including UL 94 V-0, European ENEC standards and EN 132400, etc.
　Usually, people need to choose the right capacitor encapsulation technology and make sure that the size and type of application meet needs. Capacitance stability including plenty of self, this is key to recovery capacitance of performance standards. In meeting these requirements, the special request, after supply and logistics problems will be needed to consider the main issues.
　Capacitance of miniaturization product-including in smaller package get higher capacitance, stable voltage, insulation and isolation characteristics, and other key electrical parameters, engineers in the face of circuit board space and installation height of constraints, design has a greater flexibility. With size reduced packaging, utilizing trend has become a key concern. The right components is emerging, makes the new product to meet the upcoming release of specifications. For example, 339 X2 series new compact, lead-free EMI suppression film capacitor namely to meet these requirements, capacitance value range from 1.0 to 4.7, the packet uF nF size more small, spacing is reduced to 7.5 mm. In addition, 100 nF the following 339 X2 capacitor, its height and thickness is still lower than the former 1-2 mm.
　Usually, engineers need to quickly with the EMI filter, ballast, buffer and power, such as design, few and capacitor manufacturer has a relationship. Usually, in view of the high value-added products, design personnel need to perfect the characteristics of different products, including special mold, and the power, and the fashionable appearance or a long battery life. Sometimes the product design personnel and capacitor manufacturers need to customized solutions, to cope with special challenges, such as application needs, meet the needs of the market or need special by particular test and so on. These might include: in other package size provide specific capacitance value, for the application of the limited space narrow packaging (such as car to ac power filter), or use passive device integration (IPD) technology into the filter or system function module. If the expected big enough, make the production technology to become possible is IPD can save a space and unit production costs.
　Metallized film capacitor to the trend of the development of the SMT has been established, the X and Y type voltage inhibit future may use this device technology. And through holes installation is still the main form of this kind of capacitor, some suppliers can provide components pins beforehand molding (the Pre-forming) service, so that customers shorten the time complexity and assembly. If customers request, the supplier also provide customized test during the manufacturing, such as through special higher peak voltage or current, etc. The end product design personnel may also need to suppliers to ensure the product changes in temperature or other special conditions performance. When there's these special request, the manufacturer of professional knowledge can significantly reduce product design and validation process.
　Film capacitor is the electronic industry the important components, although the corresponding production and structure in the development technology to provide more electric capacity and better electrical properties, but these devices seldom and new product new features about. In this case, because people often need to quickly complete design and component selection, when there is special requirement, capacitor manufacturer offers one-on-one type service can help solve design problems and ensure that interference filters, basic signal regulating circuit and electronic ballast and other basic function module successfully completed.

Return