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What is a capacitor film?

2024.11.23

Capacitor films, known for their use of plastic dielectric materials such as polypropylene (PP) and polyester (PET), offer exceptional durability, thermal stability, and voltage resistance. These capacitors are integral in power management, AC/DC conversion, and renewable energy systems. Industries like new energy vehicles and photovoltaic inverters heavily rely on capacitor films due to their reliability and adaptability.

Our Advanced Coating Technology

At Jiangsen Electronics, we take pride in our state-of-the-art Leybold Optics coating machines. We operate 6 highly efficient Leybold Optics machines, imported from Germany, to produce world-class metallized polypropylene films. These machines are renowned for their precision, high deposition rates, and ability to create films with exceptional uniformity and durability.

Leybold Optics Coating Machine

One of our Leybold Optics coating machines at Jiangsen Electronics.

The Leybold Optics machines enable us to maintain a dust-free, moisture-controlled environment, ensuring optimal quality and performance of our capacitor films. With their advanced technology, we achieve higher efficiency and precision, which sets us apart in the capacitor film industry. These machines support our goal of producing capacitor films that meet the stringent requirements of industries such as renewable energy and automotive applications.

Capacitor Types

Below is a comparison of capacitor films against alternative capacitor technologies to highlight their advantages:

Feature Capacitor Films Aluminum Electrolytic Capacitors Ceramic Capacitors
Dielectric Material Polypropylene (PP), Polyester Electrolyte Ceramic
Voltage Tolerance High (up to 2000V) Medium (500-650V) High (up to 1000V)
Thermal Resistance Excellent (up to 125°C) Moderate (85°C) Varies (up to 150°C)
Applications Inverters, DC-Links, Renewable Energy DC Support, Basic Power Supplies High-Frequency Circuits
Lifetime Long (self-healing) Shorter (limited by electrolyte evaporation) Moderate
Flexibility High (custom shapes and sizes) Low Low

Applications of Capacitor Films

1. Automotive Industry

With the rise of electrification, capacitor films have replaced aluminum electrolytic capacitors in new energy vehicles. The table below demonstrates why capacitor films are preferred:

Criteria Capacitor Films Aluminum Electrolytic Capacitors
Energy Density Higher, suitable for compact designs Lower
Voltage Handling 650V and above Limited to 500V
Durability Excellent, withstands voltage surges Susceptible to damage over time

Future Trends and Innovations

The ongoing developments in capacitor films include:

  • Miniaturization: Designing compact capacitors for limited spaces in advanced electronics.
  • High-Temperature Resistance: New films capable of operating above 150°C.
  • Environmentally Friendly Materials: Research into biodegradable dielectric materials.

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