TDK DC-Link Capacitors Target High-Frequency SiC Power Systems
TDK has introduced the B25696H series of DC-link film capacitors for SiC-based power electronics. The capacitors offer voltage ratings from 900VDC to 2000VDC, capacitance up to 1280µF, self-inductance as low as 30nH, and ripple current capability up to 91A.
The B25696H is a DC-link capacitor series used in power conversion systems. Target applications include renewable energy inverters, energy storage systems, solid-state transformers, traction inverters, and industrial motor drives.
Self-Inductance Down to 30nH
The B25696H series uses an internal busbar structure designed to distribute current evenly across the capacitor windings. TDK specifies self-inductance values as low as 30nH and ESR values down to 0.8mΩ at 10kHz.
According to the company, ESR performance remains stable up to 100kHz. The series is intended for switching topologies that operate at higher frequencies, including systems based on silicon carbide power devices.
The capacitors use a metallized polypropylene dielectric and are housed in an aluminum cylindrical enclosure with a resin-sealed top.
Voltage Ratings Up to 2000VDC
The series covers capacitance values from 47µF to 1280µF and voltage ratings from 900VDC to 2000VDC. TDK specifies ripple current capability up to 91A at 10kHz with an ambient temperature of +60°C. The capacitors are available in 85mm and 100mm diameter versions.
Electrical connections are provided through M6 female screw terminals, while installation is supported through an M12 threaded mounting stud.
Designed for Long-Life Power Conversion Systems
The B25696H series operates across a temperature range of -40°C to +85°C hotspot temperature.
TDK specifies a service life of 100,000 hours at +75°C hotspot temperature and rated voltage. The company states that operating life can be extended to as much as 200,000 hours through voltage and temperature derating.
The capacitors also incorporate the self-healing characteristics commonly associated with metallized polypropylene film capacitor technology.
Support for Converter Design and Thermal Modeling
TDK provides the B25696H series with support through its CapThermal simulation platform.
The online tool allows engineers to estimate capacitor temperature rise and operating lifetime using application-specific operating conditions during converter development.
Learn more and read the original announcement at www.tdk-electronics.tdk.com
Technology Overview
The B25696H series is a family of MKP DC-link film capacitors for high-voltage power conversion systems. The capacitors support voltage ratings from 900VDC to 2000VDC, capacitance values from 47µF to 1280µF, self-inductance as low as 30nH, and ripple current capability up to 91A at 10kHz.
Frequently Asked Questions
What applications are the B25696H capacitors designed for?
The series is intended for renewable energy inverters, traction drives, industrial motor drives, solid-state transformers, and energy storage systems.
What voltage ratings are available?
The B25696H family is available with rated DC voltages from 900V to 2000V.
What is the lowest inductance specified for the series?
TDK specifies self-inductance values as low as 30nH for the B25696H series.
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