| 摘要 |
PROBLEM TO BE SOLVED: To provide a high efficiency power converter by reducing the switching loss during PWM control.SOLUTION: A refrigerator includes a motor drive device driven by a power converter, and a compressor driven by a motor subjected to drive control by the motor drive device. The power converter includes a pulse control unit outputting a pulse signal for performing PWM control, a power conversion circuit for converting a DC power into an AC power by using a pulse signal output from the pulse control unit, a current detection unit for detecting the current of the power conversion circuit, a vector control unit performing vector control on the basis of a current detected in the current detection unit, and generating a command voltage to the pulse control unit, and a pulse stop control unit generating a pulse stop control signal for stopping the pulse signal, in a section determined with reference to the current phase of the power conversion circuit, over the section thus determined, and outputting the pulse stop control signal to the pulse control unit. |
