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February 14, 2013
Mitsubishi Electric Develops 1,200V/1,200A SiC Power Module Technologies
Mitsubishi Electric Corporation announced today that it has developed large-capacity silicon carbide (SiC) power module technologies incorporating all-SiC power devices for 1,200-volt, 1,200-ampere performance. The new technologies, which have been incorporated in a prototype module, are expected to expand SiC-applications to factory automation equipment, elevators, escalators, photovoltaic systems, wind-power generation systems and other industrial applications.
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The prototype is a dual module that incorporates SiC MOSFET) and SiC Schottky barrier diodes. The optimized structure limits surge voltage created during high-speed switching to the same extent as Si power modules, thereby reducing power loss and preventing the power devices from being destroyed.
Power capacity was increased by using two parallel-connected circuit blocks, and current sharing between the blocks was equalized to balance the temperature in each block. To equalize current sharing, Mitsubishi Electric optimized chip layout, main current wiring and control wiring.
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High power capacity has the potential to easily destroy power devices when a short circuit occurs. Mitsubishi Electric also developed a rapid protection circuit by incorporating a current sensor function in the MOSFET to enable the use of low-resistance devices. The resulting 75% reduction of power loss allows cooling equipment to be downsized by some 50% in application equipment.
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