APPARATUS FOR PROTECTION INPUT OPEN PHASE OF POWER CONVERTER

摘要

The present invention relates to an input imaging protection device for a power converter, comprising: an AC / DC converter for converting a three-phase AC power source into a DC power source; a charging unit for storing energy of the DC power source; and energy of the DC power source stored in the charging unit. A DC / AC conversion unit for converting the AC into an AC power source, a DC link voltage detection unit for detecting the output voltage of the charging unit, and controlling the operation of the DC / AC conversion unit, and outputting the output voltage detected from the DC link voltage detection unit. It includes a control unit that checks every set sampling time, counts the sampling time from a time point at which the identified output voltage increases and decreases to a time point again, and then determines whether there is an input phase loss according to the counted number of times. At least one phase of the three-phase input power, even if the DC link output from the converter is greatly shaken or distorted. By accurately determining the state of the input phase that is single-phase (OFF) has an effect that the input phase protection operation can be properly operated.