Implementing Triple Conversion Single-Phase On-line UPS using TMS320C240

Uninterruptible power supplies (UPS) play an important role in interfacing critical loads such as computers, communication systems, medical/life support systems, and industrial controls to the utility power grid. Among the various UPS topologies, on-line UPS provides the most protection to such loads against any utility power problem. However, because of the multiple power conversion stages, on-line UPSs have been the most complex and expensive type of system.Today’s lowcost, high-performance digital signal processor (DSP) controllers, such as the Texas Instruments (TI) TMS320C24x, provide an improved and cost-effective solution for on-line UPS design. This application report discusses the different implementation aspects of a DSP based on-line UPS design using a TMS320C240.