TDK presents its latest high-power film capacitor technology for next-generation DC-link stages in power converters. The ModCap family and related MKP/ENKP devices are designed to work directly with fast-switching SiC power modules, combining ultra-low ESL, stable ESR and high current capability in compact plastic packages. Rated voltages typically span 900–1600 V with capacitance values in the several-hundred to below 1000 µF range, targeting designs where power density, thermal robustness and long service life are critical. https://www.tdk-electronics.tdk.com/en/modcap_power_capacitors
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In this interview from SPS 2025 in Nuremberg, TDK’s product marketing manager for power capacitors explains how new flat-winding constructions and optimized polypropylene and high-temperature film systems enable operation up to 105 °C hot-spot without derating while keeping lifetime specifications around 200 000 hours. Compared with traditional cylindrical can capacitors, these modular DC-link blocks support much higher current per unit, reduce conduction paths and keep parasitic inductance down in the single-digit nanohenry range, which is crucial for SiC-based converter stages.
The ModCap units are designed to sit very close to SiC power modules, with multiple low-inductance terminals providing short, symmetric current loops. This architecture reduces voltage overshoot during fast switching and can remove the need for separate snubber capacitors in many topologies, simplifying the DC-link layout. Because a single ModCap can replace several conventional capacitors, inverter designers can shrink cabinet volume, reduce assembly effort and cut the number of busbar interfaces and mounting points in high-power converter systems.
On the application side, the discussion highlights central PV inverters, wind converters, battery energy storage systems, electrolyzers and hydrogen production equipment, as well as solid-state transformer architectures. Traction inverters for locomotives, metros and light rail also benefit from low ESL and high ripple-current capability, especially at switching frequencies extending towards hundreds of kilohertz. Stable electrical behavior over wide load swings is emphasized as an important parameter for renewables where input power fluctuates significantly.
Complementing the ModCap DC-link blocks, TDK’s ENKP and MKP families provide AC and filter-stage capacitance for solar, wind and industrial drives, so engineers can build a coordinated stack from DC-link energy storage to EMC filtering. Across this portfolio, the focus is on temperature resilience, low loss at high frequency and predictable lifetime under demanding operating profiles. The video positions capacitor technology as a key enabler for higher current density, more compact converters and long-term reliability in SiC-based renewable, traction and industrial power electronics.
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