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Two pieces of plastic film, each coated with metallic electrodes, are coiled into a cylindrical winding, terminals are joined, and the winding is then enclosed to create a film capacitor. The two terminals can be used interchangeably since, in general, film capacitors are not polarised. Plastic film capacitors come in two main varieties and have two different electrode arrangements:
Two plastic films are used as the dielectric to create film/foil capacitors, also known as metal foil capacitors. Each electrode is covered in a sheet of thin metal foil, typically aluminium. The simplicity of electrical connection to the metal foil electrodes and the construction’s capacity for high current surges are advantages of this design.
Two metallized films are combined to create metallized film capacitors, while a plastic film serves as the dielectric. One or both sides are covered with an extremely thin ( 0.03 m[2]) vacuum-deposited aluminium metallization that acts as electrodes. Dielectric breakdowns or short circuits between the electrodes may not always result in component damage in this topology, giving it “self-healing” qualities.
When compared to film/foil construction, this fundamental design enables the production of high-quality goods such “zero defect” capacitors and wrapped capacitors with bigger capacitance values (up to 100 F and larger) in smaller cases (high volumetric efficiency). The reduced current surge rating of metallized structure, however, is a drawback.
The Global film capacitor market accounted for $XX Billion in 2023 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
KEMET Introduces Three New Series of Film Capacitors for Rapidly Expanding Green Energy and Automotive Applications. A DC-Link and DC filter power film capacitor is included in the most recent C44U-M series, which is made for high-power conversion systems applications in industrial, energy storage, and green energy systems.
It enables DC networks and proportionately delivers high current depending on the requirements of the circuit or the load—a feature shared by wind, solar, and energy storage technologies. This UL 810-certified capacitor is ideal for high capacitance while minimising ESR due to its high DC voltage load capabilities (1,800 VDC) and strong ripple current.
Similar to the previous series, the new C44P-R series is UL-810 approved and offers high current capacity for input and output AC filtering (up to 1,000 VAC) in solar converters, wind turbines, uninterruptible power supply, and power factor correction systems.
Its fully vertically integrated production plant in Bulgaria enables these cylindrical aluminium canister capacitors to have better energy densities, longer lives, dependability, and high-quality constructions.
The R75H Pulse series features the same high energy density, long life, and reliability advantages but is designed with a radial box shape for PCB installation. With its high voltage range (up to 2,000 VDC), high capacitance range, high dv/dt capabilities, and AEC-Q200 approved design, this series satisfies one of the most demanding reliability requirements in the market.
These automotive-grade capacitors may enable power conversion for solar panel micro-inverters, on-board battery management systems, on-board electronics systems, and WBG semiconductor devices.
Due to its THB (Temperature Humidity Bias) test capabilities of up to 85 oC/85 R.H and working temperature of up to 125 °C, this series is intended for adaptability in challenging environments. Applications benefit from its capacity to withstand high temperatures.
