Let's meet our new WE-FTDB DC-Link Capacitor Series
WCAP-FTDB: Film Capacitors THT DC-Link Boxed (MKP)
A metalized polypropylene (MKP) film is used for the new product series DC-Link film capacitors. This results in the following features and characteristics:
High ripple current capability
High voltage values (up to 1200 VDC)
Long expected lifetime
High ripple current capability
Capacitance range: 1 µF – 75 µF
Operating temperature: -40 °C up to +105 °C
DC Link Application
Film capacitors, aluminum electrolytic capacitors or MLCCs can be used for the DC link application. Significant differences exist, among other things, with regard to the nominal voltage, the possible capacitance and the design/size of the capacitor. Intermediate circuit applications are e.g. frequency converters, solar inverters and DC chargers in the field of e-mobility. The diagram shows a simplified representation of a three-phase converter.
Film- vs. Aluminum Electrolytic Capacitors in Comparison
DC-Link applications can be very different – therefore different capacitor technologies can also be used. In principle, the advantages of the individual technologies must be considered and weighed up. In the table you can see the main differences between the film and aluminum electrolytic capacitors in comparison.
Inner Structure
The picture shows the internal structure of DC-Link film Capacitors. Film capacitors consist of a wound metalized plastic film. The pins are contacted on this winding and then sealed in a plastic box using epoxy resin.
Example Applications
EV-Chargers
Power Factor Correction (PFC) Stage
UPS – Uninterruptible Power Supplies
DC input for Solar Inverter
Inverter for Motor Drives
Measurements
Redexpert
With the help of REDEXPERT you will find the right capacitor based on your technical requirements. The tool supports, for example, with measured values for capacitance, impedance, ESR and dissipation factor (DF). The ability to compare individual components with each other in terms of measured values enables convenient component selection.
Webinar “DC Link Capacitors: Specifications and Applications”
In our webinar you will find more information regarding the specification and application of DC Link Capacitors. The following content is explained in more detail:
DC link capacitors in general
Applications of DC Link Capacitors
Comparison of Aluminum Electrolytic Capacitors and DC Link Film Capacitors using a concrete example
Interpretation of the datasheet values
Influences on the expected lifetime
Do you have specific questions about your circuit? We are happy to advise you personally. Please contact your sales representative or write us via our chat.
