| 摘要 |
The present invention is directed to a single-phase to three-phase direct converter that increases in an input amplitude modulation factor. In a first period (T1) when a cosine value (cos(2Ét)) is positive that is a cosine value of a value twice a phase angle (Ét) determined while an AC waveform output from a single-phase AC power source is regarded as a sine value of the phase angle (Ét), a discharge duty (dc) for making a first switch conducting is set to be higher than a first value determined by dividing the product of an amplitude of an AC voltage of the single-phase AC power source and the cosine value by the product of an across voltage of a capacitor and 2 . In addition to or alternatively to this, in a second period (T2) when the cosine value is negative, a rectifying duty (drec) for making a diode rectifier conducting is set to be higher than a second value that is the reciprocal of the product of the absolute value of the sine value and 2 . |
