TDK Corp. has introduced its new series of ModCap HF DC link capacitors that can operate at very high frequencies. These capacitors also deliver ultra-low equivalent series inductance (ESL) with a wide range of voltages and capacitance range.
Based on a modular capacitor concept for DC link applications, the new the B25647A* series is comprised of six new power capacitors. They offer rated voltages from 900 V to 1600 V and cover a capacitance range from 640 µF to 1850 µF. The rated currents range from 160 A to 210 A with a maximum permitted hot spot temperature of 90°C.
(Source: TDK Corp.)
A key feature of the ModCap HF DC link capacitors is the ultra-low ESL value of 8 nH as well as its flat equivalent series resistance (ESR) versus frequency evolution that is said to minimize losses even at high frequency. This makes the ModCap HF well suited for fast-switching SiC-based inverters, said TDK.
In addition, the very low self-inductance prevents voltage overshooting on the power semiconductors when the current is shut off, which generally eliminates the need for snubber capacitors, according to the company.
“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,” said TDK. “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.”
Another feature is the cubic design of the ModCap HF capacitors in comparison to conventional cylindrical designs. Measuring 205 × 90 × 170 mm, these capacitors can be used in a new generation of power modules to maximize power density, said TDK.
The capacitor series’ external materials are fully compliant with fire and smoke standard EN 45545-2 HL3 R23 and UL94 V-0, particularly for traction application. The series is UL recognized.
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