Power converter, motor driver, and refrigeration cycle applied equipment

A power converter comprising:

• a converter including at least one first semiconductor switching element and is adapted to rectify a power supply voltage applied from an alternating-current power supply;
• a smoothing capacitor adapted to smooth a rectified voltage output from the converter into a direct-current voltage containing a ripple;
• an inverter adapted to convert the direct-current voltage smoothed by the smoothing capacitor into an alternating-current voltage to be supplied to a motor;
• and
• a single calculator adapted to perform a control such that a first physical quantity is equal to a second physical quantity, wherein
• the first physical quantity represents an operation state of the converter and the second physical quantity represents an operation state of the inverter, wherein
• the single calculator is adapted to set a sampling timing for obtaining detection value of the first physical quantity in accordance with a constraint on sampling timing for obtaining detection value of the second physical quantity.