Power conversion apparatus, motor drive apparatus, and refrigeration cycle application apparatus

A power conversion apparatus comprising:

• a rectifier step-up circuit to rectify first alternating-current power and boost voltage, the first alternating-current power being supplied from a commercial power supply;
• a capacitor connected to an output end of the rectifier step-up circuit;
• an inverter circuit to convert power output from the rectifier step-up circuit and the capacitor into second alternating-current power and output the second alternating-current power to a load, the inverter circuit being connected to both ends of the capacitor;
• a current detector to detect a current value of current output from the inverter circuit and sent to the load;
• a power detector to detect a power state of the capacitor;
• and
• control circuitry to control the rectifier step-up circuit and the inverter circuit, the control circuitry causing the rectifier step-up circuit to irregularly stop boost operation when at least one of a detection value detected by the current detector and a detection value detected by the power detector is a current value indicating an anomaly, the control circuitry controlling the inverter circuit such that the detection value detected by the power detector falls below a first reference value in a case where the detection value detected by the power detector unit is equal to or greater than the first reference value when the boost operation is irregularly stopped.