Abstract
This work deals with the development of a single phase on-line uninterruptible power supply(UPS) with universal input output voltage rating(110V/220V). The converter is consisted of an ac-dc/dc-dc three level boost converter combined with a double half bridge inverter. In this type of configuration, size, cost and efficiency are improved due to the fact of reduced number of switches, batteries and not requiring isolation transformer operating in lower frequency to realize bypass operation. A higher frequency operation of both converters is adopted using a passive non-dissipative snubber circuit in the boost converter and latest available commercial technology of IGBTs switches in inverters. A simple and well known control strategy is presented. Principle of operation, simulated results and experimental results of a 2.6kVA prototype is also presented to demonstrate UPS performance.
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