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Saving money: SiC in UPS applications

Efficiency is the main driver for improvement and savings for UPS systems. In the IT environment, on-line UPS systems are used, where improved efficiency is directly measured in electricity cost savings. 3-Level solutions achieve excellent efficiency and support savings during operation already today, while the use of SiC switches will allow for another huge step in savings in the future. Technical solutions using SiC switches clearly show superior power loss behavior and thus improve efficiency significantly, without the need for a complex control system in contrast to a 3-Level solution. Despite of assumed higher SiC switch module prices opposed to the 3- Level IGBT modules, these costs are compensated by the efficiency gain after only one year of operation, and 9% of the initial invest is saved after five years of operation. Despite higher power module prices, there is a clear system benefit in using SiC devices.

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• May 31, 2014