TDK Electronics · TDK Europe

Modular Standard Series

ModCap MF and ModCap HF
Capacitor Concept

 Intro Pic

TDK is complementing the Modular Standard Series with a new version specifically designed for high-frequency performance in DC link applications. ModCap HF, in combination with the new generation of SiC semiconductor modules, enables compact converters for applications in light traction and renewable energies where a compact, robust and the most power density level is required, which is particularly recommended with the new generation of SiC semiconductors.

ModCap HF, like ModCap MF, is constructed with parallel interconnected flat windings filled with polyurethane resin but with 8 terminals and a new generation of the internal busbar. Thanks to this design, the capacitors can be placed very near to the SiC IGBT modules and absorb the effect of HF harmonics with excellent performance at a very high level in the range of several hundred kHz. Combined with an extremely low 8 nH self-inductance of the capacitors, this prevents a significant overshoot of the voltage across the IGBT modules when the power is turned off. As a result, snubber capacitors are generally not required. This, in turn, reduces the footprint and cost of new generation converter designs, particularly those using SiC technology.

Like ModCap MF, the ModCap HF is also deploying biaxial-oriented polypropylene (BOPP) as a dielectric, which enables a constant hot-spot temperature 90 °C until the new generation of dielectrics that TDK is currently developing reaches hot-spot temperatures of up to 125 °C. Simulation software such as ModCap MF is available to calculate the thermal responses of the capacitors based on parameters such as frequency spectrum, maximum current and customer-specified installation conditions.

Modular Standard Series Line up

 ModCap MF 

  • Capacitance from 350 up to 3900 µF
  • Voltages from 900 up to 2300 V
  • Low ESL <14 nH
  • Temperature up to 90 °C hot spot
  • IEC 61071, IEC 61881-1, EN 45545-2 HL3 R23 (fire and smoke), UL recognized
  • Filled with polyurethane resin (dry technology)
  • Plastic case (opened)
  • Flat windings

ModCap HF

  • Capacitance from 640 to 1850 µF
  • Voltage from 900 to 1600 V
  • Low ESL (8 nH)
  • Temperature up to 90 °C hot spot
  • IEC 61071, IEC 61881-1, EN 45545-2 HL3 R23 (fire and smoke), UL recognized
  • Filled with polyurethane resin (dry technology)
  • Plastic case (open), 8 terminals connection with new generation of internal bus bar 
  • Flat windings

Benefits ModCap MF and ModCap HF

  • Compact solution, highest power density, high frequency solution
  • Modular concept for parallelization specially for SiC semiconductors
  • Low voltage overshoot
  • No snubber capacitors are needed
  • Lifetime up to 200 000 hours
  • Simulation software available
  • Cost optimized
  • Reduces time to market and lead time


Thermal simulation

Thermal model available for specific simulation according to spectrum and boundary conditions defined by the customer.

 Simulations Thermal Map

Electromagnetic simulation

Electromagnetic model available for specific simulation according to spectrum and boundary conditions defined by the customer.

 Simulations Electromagnetic

ModCap Solves Design Problems

Why are snubber capacitors generally not required?

ModCap HF has been designed to minimize the stray inductance; values around 8 nH are achieved for the whole series. Thanks to its design, the capacitors can be fitted very near to the SiC semiconductor modules, thus producing very short lead lengths. This stops any substantial voltage overshoot at the semiconductors modules when the current is shut off. As a result, no snubber capacitors are needed.

Why does ModCap have higher energy and power density than other solutions?

ModCap HF is based on previous design of ModCap MF although with an internal construction and 8 terminals in order to reinforce the performance at HF and the power density. The unique metallization of the films maximizes self-healing capability while withstanding high current densities thanks to its reduced film width, thus reducing losses. The capacitor dimensions were designed for current and future SiC power modules to optimize the DC link unit's footprint in terms of dimensions and power, almost equal dimension than small construction of ModCap MF.

What is the maximum hot spot temperature of this series?

Up to 90 °C of hot-spot temperature can be achieved during operation as in case of ModCap MF thanks to the use of high crystallinity BOPP and our fine-tuned automated process parameters. New versions of ModCap HF to include high temperature film is actually under development.

As with ModCap MF TDK offers FEA simulations for ModCap HF for precise heat distribution in the capacitor, tailored to your specific electrical and mechanical conditions. TDK can simulate ModCap HF in customer setup, taking into account the electrical conditions and all other aspects that may have an influence, such as external electromagnetic interference, the cooling system, the mechanical assembly and what is more important, the performance at HF together new generation of SiC semiconductors

Is ModCap compliant with fire and smoke regulations?

As ModCap, all materials used in rail vehicles for passenger transport must meet the EN45545-2 standard in order to achieve the highest level of safety possible in the event of a fire. Railway vehicles are classified in accordance with the fire hazard level associated with their design and operation.

The three hazard levels are: HL1, HL2 and HL3 with HL1 being the lowest requirement and HL3 being the highest. ModCap MF series meet the high requirements of the new European fire protection standard EN45545-2, reaching safety levels up to HL3 in the requirement set applicable to power capacitors (R22, R23 and/or R24).

Therefore, ModCap HF can even be installed in bunks and bed wagons that cross long tunnels and railway vehicles operating on the underground tracks.

ModCap HF, as well as ModCap MF, are recognized as UL approval.

Why ModCap is able to handle harmonics up to 100 kHz?

The basis for the use with high harmonics is the internal new generation bus bar included with ModCap HF. Thanks to its internal bus bar ModCap HF is able to handle the HF harmonics achieving a homogenous internal current distribution avoiding resonance effects.

Product Resources

Suitable for

 Solar Grid

Get Data Sheets

PDF Type Application Style Number of phases Rated capacitance (µF)
B25645 DC link MKK DC-R unknown 350 - 3900
B25647 DC link MKK DC-R unknown 640 - 1850

In order to download up to 20 files together as zip, please mark them with the check box. To start the download, please click the Download button at the end of the list.

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