Dongguan Weiqing Electronics Co., Ltd

CN EN
News

Internal structure for increasing the rated voltage

Release time:

2024-01-05 17:26

Source:

The rated voltage of different film materials depends on factors such as film thickness, material quality (free from physical defects and chemical impurities), ambient temperature, operating frequency, and the safety margin against breakdown voltage (dielectric strength). However, broadly speaking, the rated voltage of film capacitors primarily hinges on the thickness of the plastic film. For example, using the minimum available film thickness for polyester film capacitors—approximately 0.7 μm—it is possible to manufacture capacitors with a rated voltage of 400 VDC. If higher voltages are required, thicker plastic films are typically employed. Yet, the breakdown voltage of dielectric films generally exhibits a nonlinear relationship: for thicknesses greater than about 5 mils, the breakdown voltage increases only in proportion to the square root of the film thickness. On the other hand, capacitance decreases linearly with increasing film thickness. For reasons related to availability, storage, and existing processing capabilities, there is a strong desire to achieve higher breakdown voltages while continuing to use currently available film materials. This can be accomplished by metallizing only one side of the insulating film, thereby creating an internal series connection within the capacitor. By employing this series-connection technique, the overall breakdown voltage of the capacitor can be multiplied by an arbitrary factor; however, the total capacitance will also decrease by the same factor. For reasons related to availability, storage, and existing processing capabilities, there is a strong desire to achieve higher breakdown voltages while continuing to use currently available film materials. This can be accomplished by metallizing only one side of the insulating film, thereby creating an internal series connection within the capacitor. By employing this series-connection technique, the overall breakdown voltage of the capacitor can be multiplied by an arbitrary factor; however, the total capacitance will also decrease by the same factor. For reasons related to availability, storage, and existing processing capabilities, there is a strong desire to achieve higher breakdown voltages while continuing to use currently available film materials. This can be accomplished by metallizing only one side of the insulating film, thereby creating an internal series connection within the capacitor. By employing this series-connection technique, the overall breakdown voltage of the capacitor can be multiplied by an arbitrary factor; however, the total capacitance will also decrease by the same factor. The breakdown voltage can be enhanced either by using a unilaterally metallized film or by employing a bilaterally metallized film. Bilaterally metallized films can also be combined with partially metallized layers to form internally series-connected capacitors. These various design approaches are particularly well-suited for high-reliability applications involving polypropylene films.

Previous Page

None

Next Page

Self-healing of metallized film capacitors

Related News

2026 Complete Guide: What Is a Thin Film Capacitor, Uses & Selection Tips

This 2026 updated guide from Weiqing Electronics breaks down all essential information about thin film capacitors, from basic definitions to practical selection strategies. Drawing on our years of manufacturing and testing experience, we share real test data, industry insights, and objective comparisons to help you pick the right component for your electronic design.

2026 Complete Guide to Thin Film Capacitor: Selection, Types & Applications

This 2026 professional guide breaks down all key information about thin film capacitors, from basic working principles to practical selection tips. Drawing on over 30 years of manufacturing experience at Weiqing Electronics, it helps designers and procurement teams pick the right component, answering common questions and comparing performance across types.

Thin Film Capacitor: Types, Applications, Benefits & Selection Guide 2026

This complete 2026 guide covers all key aspects of thin film capacitors, including basic definitions, core types, performance advantages, common applications, and expert selection tips. Backed by Weiqing Electronics’ 20+ years of manufacturing experience and third-party industry data, this guide helps engineers and procurement professionals make informed decisions for consumer automotive, industrial, and aerospace electronic projects.

Resonant Capacitor 2026 Guide: Types, Selection & Applications for Engineers

This guide covers all core knowledge of resonant capacitors for 2026, from basic definitions and working principles to selection criteria and common application scenarios. We combine Weiqing Electronics’ decades of manufacturing and testing experience to deliver objective, professional insights, helping engineers and procurement professionals avoid common selection mistakes and improve circuit performance.

Resonant Capacitor: Complete 2026 Guide for Selection and Applications

This 2026 expert guide from Weiqing Electronics breaks down all key information about resonant capacitors, from core definitions and working principles to practical selection tips and troubleshooting. It includes in-house test data and real-world experience to help you pick the right component for your project.

Complete 2026 Guide: How to Choose a Reliable Capacitor Manufacturing Plant

This guide covers all critical aspects of sourcing from a professional capacitor manufacturing plant, from quality control protocols to production capacity and custom design support. We draw on 20+ years of hands-on production experience, 2026 industry data, and answer common questions to help you avoid sourcing risks. Whether you need prototypes or bulk production, this guide helps you make an informed decision.