JP2006115576A5 - - Google Patents

Claims (5)

  An inverter circuit that converts DC power into AC power; and a control device that controls the inverter circuit by a phase difference control method, wherein the control device detects current flowing through the inverter circuit; and AC voltage A phase difference detecting means for detecting a phase difference between the current and the alternating current, an adjusting means for adjusting a duty reference value according to an error between the detected phase difference and a target phase difference, and a vibration component of the alternating current A current vibration detecting means for detecting the frequency, a frequency correction amount calculating means for calculating a frequency correction amount based on the vibration component of the alternating current, and a frequency correction means for correcting a frequency command value based on the calculated frequency correction amount. PWM signal generation for calculating a PWM signal based on the output waveform data corresponding to the corrected frequency command value and the adjusted duty reference value It has a unit, wherein the control device, an inverter device and outputs the PWM signal to the inverter circuit. The frequency correction amount calculation means increases the frequency correction amount when the vibration component detected by the current vibration detection means is large, and decreases the frequency correction amount when the vibration component is small. The inverter device according to Item 1. A synchronous motor driving inverter circuit for converting direct current power to alternating current power; and a control device for controlling the inverter circuit by a phase difference control method, wherein the control device detects direct current flowing through the inverter circuit. A detection means; a phase difference detection means for detecting a phase difference between an AC voltage and an AC current based on the detected DC current; and a duty according to an error between the detected phase difference and a target phase difference. Adjusting means for adjusting a reference value; current vibration detecting means for detecting a vibration component of the alternating current; and a rotational speed correction amount calculating means for calculating a rotational speed correction amount of the motor based on the vibration component of the alternating current; Motor rotational speed correction means for correcting the motor rotational speed command value based on the calculated rotational speed correction amount, and an output corresponding to the corrected motor rotational speed command value PWM signal generating means for calculating a PWM signal based on the shape data and the adjusted duty reference value, and the control device outputs the PWM signal to the inverter circuit. Inverter device. A compressor driving device comprising the inverter device according to claim 1. A refrigeration / air-conditioning apparatus comprising the compressor driving apparatus according to claim 4.