Overcurrent detection circuit, drive control device, and power conversion device

An overcurrent detection circuit comprising:

• a detection unit configured to detect whether a current flowing between main terminals of a main switching device used by a power conversion device is an overcurrent;
• and
• a switching unit configured to switch among thresholds used for determining the overcurrent in the detection unit according to in which phase of the power conversion device the main switching device is used, wherein
• the switching unit is configured to select any of the thresholds set for each phase based on a signal supplied according to the phase in which the main switching device is used,
• the detection unit includes a plurality of comparison units configured to compare a parameter according to the current flowing between the main terminals, and thresholds different from each other, and
• the switching unit is configured to switch, among the plurality of comparison units, a comparison unit for use in detection of the overcurrent.