Power converting apparatus, dehumidifier, air conditioner, and refrigeration apparatus

A power converting apparatus that outputs an alternating-current power to drive an electric motor, the power converting apparatus comprising:

• a switching circuit that converts, based on driving of switching elements, an input direct-current power into an alternating-current power and outputs the alternating-current power;
• and
• a driving control unit capable of controlling a carrier frequency and controlling the driving of the switching elements, wherein
• the driving control unit sets a threshold of a noise level of a carrier noise at a specified carrier frequency for a noise level of a carrier noise obtained by combining noises that occur in the electric motor and the power converting apparatus due to the driving of the switching elements at the carrier frequency, sets a threshold of the number of rotations at which a noise level of a driving noise becomes a noise level of the threshold set at the specified carrier frequency for a noise source including the electric motor, for a noise level of driving noises from a plurality of noise sources that occur irrespective of the carrier frequency in one and the same housing in which the power converting apparatus and the electric motor are contained, and controls the carrier frequency based on the number of rotations of the noise source including the electric motor and the threshold of the number of rotations.