Film capacitors, as important electronic components, are widely used in many fields such as power filtering, signal coupling, and resonance circuits. The performance of film capacitors directly affects the stability and reliability of electronic devices. The performance of film capacitors is closely related to their internal structure. How much do you know about the internal structure of film capacitors? Let me take you through it.
The internal structure of film capacitors mainly consists of electrodes, dielectric materials, and encapsulation.
Electrodes serve as carriers for storing charge in capacitors. The dielectric material is placed between the two electrodes to separate them and prevent direct electrical conductivity between them. Encapsulation protects the internal structure from external environmental influences.
The electrodes of film capacitors are made of metal foil materials such as aluminum foil and zinc foil. Metal foils have excellent conductivity, ensuring rapid charge transfer and laying the foundation for the operation of film capacitors.
The dielectric material is a critical component of film capacitors. It is typically made of materials such as polyester (PET), polypropylene (PP), polystyrene (PS), polycarbonate (PC), etc. These materials have good insulation and stability, preventing charge leakage. Different dielectric materials have different characteristics, and the choice of film capacitors depends on practical applications.
The encapsulation material of film capacitors usually includes epoxy resin coatings or molded plastics. Epoxy resin coatings have high insulation resistance, stable dielectric constant, and resistance to impact and vibration. Molded plastics have high mechanical strength, corrosion resistance, and impact resistance.
Epoxy resin coatings and molded plastics work together to protect the internal structure of capacitors from moisture, mechanical damage, corrosion, and other external factors, ensuring long-term stable operation of capacitors.
This article is provided by JYH HSU (JEC) Electronics. JEC is a research, development, production, and sales-oriented company specializing in manufacturing and selling various electronic components such as capacitors and resistors.
Post time: Apr-30-2025