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Hybrid aluminium polymer capacitors

KEMET has announced the launch of three hybrid aluminium polymer capacitor series: the A780, PHA225, and PHH225.

These AEC-Q200 qualified capacitors offer a combination of highly conductive polymer technology and liquid electrolytic material in a hybrid design, resulting in a much improved electrical performance for automotive and industrial applications. The launch aligns with the growing vehicle electrification product market, driven in part by a rising need for 48V architecture in mild hybrid electric vehicles (MHEV).

The A780 series is KEMET’s first release of a surface mount (V-Chip) hybrid aluminium polymer capacitor. Both liquid aluminium electrolyte and solid polymer materials are housed in a cylindrical aluminium can and when combined, provide greater advantages such as a higher ripple current, lower equivalent series resistance (ESR), lower leakage current, and exceptional self-healing capability than standard solid polymer aluminium capacitors with no liquid electrolyte.

These capacitors can withstand heavy vibrations (up to 30g), meeting the stringent design requirements for automotive powertrain and industrial applications, including engine control units, DC/DC converters, 48V inverters for MHEV, switched-mode power supply (SMPS) and computer voltage regulator modules (VRM).

The PHA225 and PHH225 with an axial and radial crown design also offer the same combination of highly conductive polymer and liquid electrolytic material as the A780 series. These capacitors can withstand temperatures up to 140°C, provide extremely high ripple current capability and self-healing performance. The hybrid construction of polymer and liquid electrolytic provides extremely low and stable ESR across all temperature ranges, thus extending its operating lifetime.

The PHA/PHH 225 capacitor has a small size and high ripple current per unit volume, which is valuable when designing-in for automotive and industrial technologies, such as 48V automotive inverters. By using smaller, high power density hybrid aluminium capacitors in parallel for an existing 48V automotive inverter design, engineers can reduce the number of required components and still maintain high ripple current performance.

The PHA225 and PHH225 hybrid series is intended for designing in high power automotive applications, including DC-Link for 48V inverters, cooling fans, water pumps, power steering, and braking and injection systems.

Author
Neil Tyler

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