JP2006115575A5 - - 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 detection means for detecting a phase difference between the AC current and the AC current; an adjustment means for adjusting a duty reference value according to an error between the detected phase difference and a target phase difference; and the detected phase difference A phase difference vibration detecting means for detecting a vibration component of the phase difference, a frequency correction amount calculating means for calculating a frequency correction amount based on the vibration component of the phase difference, and correcting a frequency command value based on the calculated frequency correction amount PW that calculates a PWM signal based on the frequency correction means that performs, the output waveform data corresponding to the corrected frequency command value, and the adjusted duty reference value It has a signal creation 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 rotation speed correction amount when the vibration component detected by the phase difference vibration detection means is large, and decreases the rotation speed correction amount when the vibration component is small. The inverter device according to claim 1. A motor drive inverter circuit for converting DC power into AC power and a control device for controlling the inverter circuit by a phase difference control method, wherein the control device detects a DC current flowing through the inverter circuit. Means, a phase difference detecting means for detecting a phase difference between an AC voltage and an AC 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 phase difference vibration detecting means for detecting a vibration component of the phase difference by removing a DC component of the phase difference detected by the phase difference detecting means; and a rotational speed correction amount of the motor based on the vibration component of the phase difference. A rotational speed correction amount calculating means for calculating, a motor rotational speed correcting means for correcting a motor rotational speed command value based on the calculated rotational speed correction amount, and the corrected motor speed. PWM signal generating means for calculating a PWM signal based on the output waveform data corresponding to the numerical command value and the adjusted duty reference value, and the control device sends the PWM signal to the inverter circuit. An inverter device characterized by outputting. 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.