February 26, 2015

Power capacitors: Ring-shaped design for e-mobility

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TDK Corporation presents the EPCOS RingCap – a power capacitor with an innovative design that is especially suitable for xEV applications. Thanks to its ring configuration, the new RingCap can be integrated into a clutch bell housing or wheel hub motors. The dimensions of the capacitor can be adapted according to the specific requirements of the customer: The outer diameter may be up to 315 mm, while its width is no more than 50 mm.

The EPCOS RingCap is designed for rated voltages of between 100 V DC and 900 V DC and offers capacitance values of between 100 µF and 2000 µF. Apart from the main winding, Y-capacitors with separate terminals can additionally be integrated in the winding. A special heat-treatment under vacuum increases long-term stability of the capacitor. In the standard version with dielectric made of polypropylene (PP) or polyethylene terephthalate (PET), the capacitor is suitable for a temperature range between -40 °C and +105 °C. With a dielectric made of polyethylene naphthalate (PEN), it can even handle temperatures of up to +150 °C.

Due to the low equivalent series inductance (ESL) values ranging from less than 10 nH up to 30 nH, no unwanted overvoltages occur in the DC link circuit during high-speed switching operations. For better protection against environmental effects, the capacitor is also available with a resin-filled housing.

Main applications

  • DC link capacitor for hybrid and electric vehicles

Main features and benefits

  • Flexible ring-shaped design
  • Rated voltages of between 100 V DC and 900 V DC
  • Capacitances between 100 µF and 2000 µF

For further information contact our Sales department at www.epcos.com/inquiry

Please forward reader inquiries to marketing.communications@epcos.com.

About TDK Corporation

TDK Corporation is a leading electronics company based in Tokyo, Japan. It was established in 1935 to commercialize ferrite, a key material in electronic and magnetic products. TDK's portfolio includes electronic components, modules and systems* marketed under the product brands TDK and EPCOS, power supplies, magnetic application products as well as energy devices, flash memory application devices, and others. TDK focuses on demanding markets in the areas of information and communication technology and consumer, automotive and industrial electronics. The company has a network of design and manufacturing locations and sales offices in Asia, Europe, and in North and South America. In fiscal 2014, TDK posted total sales of USD 9.6 billion and employed about 83,000 people worldwide.

* The product portfolio includes ceramic, aluminum electrolytic and film capacitors, ferrites, inductors, high-frequency components such as surface acoustic wave (SAW) filter products and modules, piezo and protection components, and sensors.