Inverter with Hard- and Soft-Switched Transistors for usage in Uninterruptible Power Supplies

摘要

To reduce the filter expenditure inverters in uninterruptible power supplies are pulsed increasingly with higher frequencies today. A substantial part of the losses in these inverters are caused by the switching processes. These losses can clearly reduced by soft switching. In the paper inverters for uninterruptible power supplies with hard and soft switched transistors will be described. At first the efficiency-curves of the inverters are shown. Then the total losses in the inverters are analyzed based on practical measurements. The losses in the switches are divided into switching and forward power losses. At last the results are compared to each other.