CN203118781U - 一种多层复合介质薄膜电容器 - Google Patents

一种多层复合介质薄膜电容器 Download PDF

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CN203118781U
CN203118781U CN 201220414213 CN201220414213U CN203118781U CN 203118781 U CN203118781 U CN 203118781U CN 201220414213 CN201220414213 CN 201220414213 CN 201220414213 U CN201220414213 U CN 201220414213U CN 203118781 U CN203118781 U CN 203118781U
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film
capacitor
pet
layer
multilayer composite
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吴建明
王波
陶雨胜
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SHENZHEN SINCERITY TECHNOLOGY Co Ltd
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SHENZHEN SINCERITY TECHNOLOGY Co Ltd
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Abstract

本实用新型公开了一种多层复合介质薄膜电容器,由四层膜结构的复合膜体绕卷而成;所述的四层膜结构的复合膜体是由从上至下的PET金属化膜层、PP膜层、PET金属化膜层和PP膜层叠合而成,或者,所述的四层膜结构的复合膜体是由从上至下的PP金属化膜层、PET膜层、PP金属化膜层和PET膜层叠合而成。该多层复合介质薄膜电容器的容量随温度的变化量小,性能稳定。

Description

一种多层复合介质薄膜电容器
技术领域
本实用新型涉及一种塑胶薄膜电容器,特别涉及一种多层复合介质薄膜电容器。 
背景技术
塑胶薄膜电容器是电容器产品中的一种,它是一种性能优越的电容器,其具有如下特性:无极性,绝缘阻抗很高,频率特性优异(频率响应宽广),而且介质系数很小。塑胶薄膜电容器由于体积小容量大,因此有广泛的用途,可以做不同系列的产品,如高储能电容器,抗电磁干扰电容器,安全膜电容器,交流启动电容器,高频高压电容器,电力电容器等等。 
    塑胶薄膜电容器的结构形式主要有两种,一种是以金属箔为电极,塑胶薄膜做介质卷绕在一起而制成的薄膜电容器,另一种是在塑胶薄膜表面使用真空蒸镀技术将金属材料附着在上面而制成的电容器。蒸镀在薄膜表面的金属层相当于电极,比箔式结构的电容器体积更小,容量更大,现在使用塑胶薄膜电容器都是依据金属化结构而生产的。 
   无论是箔式结构还是金属化结构的电容器,电容器的电气性能一般有四个主要参数:标称容量及偏差,损耗角,绝缘电阻,额定电压,除了以上四个主要参数外,还有一个重要参数就是电容量的温度系数。实际电容器的电容量是随着温度变化而变化的,当温度升高时,有的电容量会变大,称为正温度系数的电容器;有的则变小,称为负温度系数的电容器
目前最常用的材料是PET与PP两种,PET材料是属于正温度系数的电容器,而PP材料则是属于负温度系数的电容器,若要单独使用此两种材料都无法满足高精度容量(容量随温度的变化很小)的要求,有些材料做成的电容器容量精度也高,但成本会很高。 
实用新型内容
本实用新型所要解决的技术问题是提供一种多层复合介质薄膜电容器,该多层复合介质薄膜电容器的容量随温度的变化量小,性能稳定。 
实用新型的技术解决方案如下: 
一种多层复合介质薄膜电容器,由四层膜结构的复合膜体绕卷而成;所述的四层膜结构的复合膜体是由从上至下的PET金属化膜层、PP膜层、PET金属化膜层和PP膜层叠合而成,或者,所述的四层膜结构的复合膜体是由从上至下的PP金属化膜层、PET膜层、PP金属化膜层和PET膜层叠合而成。
PET膜指聚酯膜,PP膜表示聚丙烯膜。聚酯金属化膜即PET金属化薄膜(由PET膜层和金属镀层组成),聚丙烯金属化膜即PP金属化膜(由PP膜层和金属镀层组成)。PET膜层又称为PET光膜层,PP膜层又称为PP光膜层。 
有益效果:
本实用新型的多层复合介质薄膜电容器,结合PET薄膜和PP薄膜的两者不同特点,使该复合介质薄膜电容器能够适用于高频率,高电压,要求高精度容量场合下的使用。
采用多层复合介质薄膜的电容器表现出优越的容量高稳定性,且耐高电压,耐高频率。实验表明,在同一高温度120℃的条件下:复合介质薄膜电容器的容量变化率为1.5%左右;采用PP薄膜的电容器容量变化率为3%左右;采用PET薄膜的电容器容量变化率为10%左右;在同一低温度-40℃的条件下:采用复合介质薄膜的容量变化率为0.1%左右;采用PP薄膜的电容器容量变化率为1%左右,采用PET薄膜的电容器容量变化率为2%左右。从以上实验可以看出采用多层复合薄膜介质电容器能够满足使用之要求。 
附图说明
图1是本实用新型的多层复合介质薄膜电容器的总体结构示意图。 
标号说明:1-第一层膜,2-第二层膜,3-第三层膜,4-第四层膜,5-金属镀层。 
具体实施方式
以下将结合附图和具体实施例对本实用新型做进一步详细说明: 
实施例1:
如图1所示,一种多层复合介质薄膜电容器,由四层膜结构的复合膜体绕卷而成;所述的四层膜结构的复合膜体是由从上至下的PET金属化膜层、PP膜层、PET金属化膜层和PP膜层叠合而成,所述的PET金属化膜层、PP膜层、PET金属化膜层和PP膜层分别对应图1中的第一层膜1、第二层膜2、第三层膜3和第四层膜4;PET金属化薄膜由PET膜层和金属镀层5组成,聚丙烯金属化膜即PP金属化膜由PP膜层和金属镀层5组成;
或者,所述的四层膜结构的复合膜体是由从上至下的PP金属化膜层、PET膜层、PP金属化膜层和PET膜层叠合而成。
这种设计是属于将第一条PP金属化膜下叠加一条PET光膜,第三条PP金属化薄膜下叠加一条PET光膜,然后四条薄膜叠加一起卷绕而形成电容器。反之也是一样的结构,只是金属化薄膜与光膜位置改变而已。由于增加一条光膜,可以增加其电容器的耐电压;可以使用在高电压,高频率振荡电路,如LED户外路灯等对容量要求随温度变化小的场合等。 

Claims (1)

1.一种多层复合介质薄膜电容器,其特征在于,由四层膜结构的复合膜体绕卷而成;所述的四层膜结构的复合膜体是由从上至下的PET金属化膜层、PP膜层、PET金属化膜层和PP膜层叠合而成。
CN 201220414213 2012-08-21 2012-08-21 一种多层复合介质薄膜电容器 Expired - Fee Related CN203118781U (zh)

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US9852846B2 (en) 2015-02-26 2017-12-26 Capacitor Sciences Incorporated Self-healing capacitor and methods of production thereof
US10340082B2 (en) 2015-05-12 2019-07-02 Capacitor Sciences Incorporated Capacitor and method of production thereof
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CN114334451A (zh) * 2021-11-26 2022-04-12 西安交通大学 金属化膜电容器

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