A feasible high-performance single-phase UPS incorporating switched mode rectifier with high-frequency transformer link

It is essential for an uninterruptible power supply (UPS) to eliminate harmonic currents in its input current and to get unity power factor. The switched mode rectifier (SMR) with a high-frequency transformer link has promising characteristics as an AC/DC conversion circuit for UPS. It does not only eliminate harmonic currents but also provides an isolation between AC input and DC output with a small high frequency transformer. We applied the SMR for the development of UPS with capacity of 2 kVA, 3 kVA and 5 kVA. This paper presents circuit configurations and control strategies of the SMR and the test results of the developed UPS.