The stack designs are available from IXYS at 3.3kV, 6.6kV and 10kV levels and incorporate the company’s press-pack IGBT technology. The 3.3kV option is available as a single stack, comprising a complete phase leg of four 2400A press-pack IGBTs plus the anti-parallel and neutral point clamp diodes. The phase leg is rated at 8MW. Both the 6.6kV and 10kV solutions comprise discrete stacks of 1600A reverse conducting press-pack IGBTs and fast diode which can be configured into the phase leg. Each phase leg would require two IGBT stacks and one diode stack. The 6.6kV stacks are rated at up to 12MW and the 10kV units are rated up to 16MW. The 6.6kVstack comprise four series devices and the 10kV stacks six. Actual power ratings depend on the configuration of the control system. Each system has direct water cooling to provide heat dissipation away from the devices, and pre-loaded disc spring clamping to evenly distribute the applied force across the device’s surface area. Stacks use an isolated clamping rod system to limit the occurrence of eddy currents within the unit. The IGBT stacks also incorporate gate trigger boards and snubber circuits. The stacks allow quicker access to prototype completions. The company can either continue to supply a stack customised to a particular specification or the components kits to fit a customer’s own design. Typical applications include medium voltage drives for industrial, marine and renewable energy infrastructure applications including wind generation, plus very large drives for use in the oil, gas and steel industries.

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