| 摘要 |
PROBLEM TO BE SOLVED: To improve the distortion of the output voltage of an inverter. SOLUTION: This inverter equipment converts an AC voltage input from an AC power supply to a DC voltage by a converter 2, and an inverter 3 converting this DC voltage into an AC voltage is controlled by a pulse width control signal determined from on a sine wave chopping wave comparison method based on a command frequency by a PWM(pulse width modulation) control circuit. In this case, provided are a current detector 8 detecting a current flowing to one phase of an output circuit of an inverter 3, a zero cross detecting circuit 9 detecting the zero cross of this detected current, a three-phase zero cross arithmetic circuit 10 sequentially outputting pulse width correction values for one period portion at the phase intervals of a predetermined electrical angle from on the zero cross detecting signal, and a pulse width correction arithmetic section which corrects the pulse width determined by a PWM control circuit by a pulse width correction value output by a zero cross arithmetic circuit and controls the inverter by the control signal with the corrected pulse width. |
