Power modules optimised for automotive control

Semikron has introduced two intelligent power-control modules optimised for use in the control systems of fuel-cell powered vehicles.

Semikron has introduced two intelligent power-control modules optimised for use in the control systems of fuel-cell powered vehicles.

The SKAI modules have been assessed by General Motors as being considerable smaller, higher in performance and lower in cost than competitors' products.

The SKAI modules are three-phase inverters used to convert DC voltage (from the fuel cell) into AC voltage (to the motor drive) with the additional option of power feedback.

The systems feature an integrated DSP controller, driver and protection functions, DC-link capacitors, semiconductors, isolation, sensors and liquid cooling and communicate with the vehicle via its CANbus.

The power electronics modules are available in two versions.

The IGBT module is designed for 600/1200V, 500/400A output current, and between 50 and 200kW of motor power, whereas the MOSFET module provides 75/100/150V, 700/600/500A output current and between 3 and 20kW of motor power.

SKAI uses Semikron's patented SKiiP pressure contact technology, which has already been used in automotive applications.

In fact, thanks to SKiiP technology, Semikron already boasts over ten years of experience as a supplier of power electronic systems for battery-run vehicles, in particular forklift trucks.

This pressure contact technology, which is used for all electrical and thermal contacts, ensures extended lifetime and thermal cycling capability.

Unlike soldered connections, pressure contacts are not sensitive to impact, vibration and high ambient temperatures and ensure direct heat transfer to the heatsink.

In recognising Semikron as its supplier of the year for the development of the SKAI system, General Motors figures showed that the SKAI modules are 40% smaller, offer 25% improvement in performance, but cost 35% less than competitors' products.

"Our success here is based on the many years of experience we have in the very similar field of electric vehicle applications", explained Peter Frey, Managing Director of Sales/Marketing at Semikron International.

"We see ourselves as pioneers in the field of hybrid electric drives", he added.

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