AC-DC CONVERTER, MOTOR DRIVE DEVICE WITH AC-DC CONVERTER, AND AIR CONDITIONER, REFRIGERATOR, HEAT PUMP TYPE HOT-WATER HEATER, WASHING MACHINE AND CLEANER WITH THE MOTOR DRIVE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an AC-DC converter capable of controlling an input current to a sine wave with the same phase as an AC voltage when a power frequency changes.

SOLUTION: A control circuit 20 includes a power supply period calculation section 23 which calculates a period T of an AC voltage based on the time between zero points detected by a zero-point detection circuit 11; an angular frequency calculation section 24 which calculates an angular frequency ω of an AC voltage based on the period calculated by the power supply period calculation section 23; a power supply phase calculation section which calculates a phase θ of an AC voltage based on a time between zero points and an angular frequency ω; and a driving signal generation section 28 which generates a driving signal based on the phase θ, the angular frequency ω, an AC voltage detected by a power voltage detection circuit 9 and a DC voltage detected by a DC voltage detection circuit 10.

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