| Abstract: | This paper presents a single-phase input-output common bus line uninterruptible power supply (UPS) circuit topology using a six-in-one insulated gate bipolar transistor (IGBT) module which incorporates a bidirectional chopper-linked battery bank with specific current-mode control strategy. The steady-state operating principle of this UPS topology and its new control strategy are described, together with conventional UPS. The experimental results of the cost-effective and high-performance small-scale UPS topology with a two-quadrant chopper-fed battery link are illustrated for the developed 3 kV A UPS and discussed, in comparison with conventional UPS topologies, from a practical point of view. |
