Posted on 07 April 2019

Film Capacitors for DC-Link








DC-Link or DC intermediate circuits are energy storage devices that connect several electricity grids by inverters on a joint current and voltage level.

Requirements for film capacitors for DC-Links are:

- High CV (capacitance x voltage) product

- Compact

- Over-voltage (DC) capability

- Low losses (ESR) with high current capability

- High frequency ripple current

- Low parasitic inductance (ESL)

- High reliability

- Long useful life

- Thermal stability 85ºC to 100ºC.


User benefits are:

- Thermal stability (85ºC to 100ºC)

- High current capability

-High  capacitance density


The determining parameters to optimize a solution are:

- Voltage (load profile, surge/tranients)

- Ripple current (frequency spectrum, load profile)

- Ambient temperature (load profile?)

- Cooling conditions

- Requested useful life - which end of life criteria are important in your application?

- Actual capacitance (at delivery date, at end of life)

-Dimensions, pinning, labeling, insulation, mounting


For further information on film capacitors please click on the following articles:

Capacitor Bank Design

Calculating the Useful Life of Capacitors

Mounting Positions of Aluminum Electrolytic Capacitors with Screw Terminals

Equivalent Series Resistance (ESR) for Capacitors

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