TDK has expanded its axial and soldering-star aluminum electrolytic capacitor lineup with new 125-V components in the B43693 and B43793 series and upgraded its existing 63-V B41687 and B41787 series.
The capacitors are designed for high-ripple-current dc-link banks used in small electric vehicles (EVs), micromobility platforms, and other electrified systems with battery voltages from 48 to 120 V.
The 125-V series can support higher dc-link voltages with a single component, reducing the need to connect capacitors in series. This can simplify capacitor-bank design and reduce the space and number of components required in EV inverter systems.
Specifications include:
- Ripple-current capability of up to 21.6 A
- Operating temperatures of up to +140° C for the 125-V series
- Capacitance values from 56 to 650 µF
- Standard vibration resistance of up to 20 g, with 60 g available on request
- Can sizes from 16 × 25 mm to 21 × 49 mm
The B41687 and B41787 series cover ratings from 25 to 63 V, operate at temperatures of up to +150° C, and provide capacitance values from 510 to 4,800 µF.
All four series feature low equivalent series resistance and high ripple-current capability to reduce power losses and heat generation in inverter dc-link stages. Axial-lead and soldering-star terminals support horizontal or vertical mounting on printed circuit boards and busbars.
Heat-sink mounting can more than double the ripple-current capability of the 125-V capacitors. For example, the rated ripple current of an 18 × 30 mm component increases from 5.2 A at +105°C ambient temperature to 11.1 A when its aluminum case is maintained at +105° C. The higher ripple-current capability can help engineers reduce capacitor-bank size, component count, and assembly costs in compact EV power-electronics systems.
Filed Under: Power Electronics, Technology News