UNINTERRUPTIBLE POWER SUPPLY DETECTING MOMENTARY POWER FAILURE FOR MONO PHASES INPUT

摘要

PURPOSE: An uninterruptable power supply device detecting a momentary power failure for a single phase input is provided to properly perceive a moment spike voltage by monitoring a peak value of an input voltage in real time. CONSTITUTION: A synchronous reference frame conversion unit(300) converts an instantaneous voltage and a phase delay voltage into a synchronous reference frame by obtaining Vqe and Vde. An input voltage maximum value calculation unit(400) finally calculates Vm by raising Vqe and Vde to the second power, adding each other and extracting a square root. A surge sensor(500) detects the rise and the drop of a momentary voltage in real time.