| 摘要 |
PURPOSE:To restrain the pulsation of DC voltage and permit the improvement of the power factor of the title device by a method wherein a DC voltage pulsation correcting means, regulating the amplification degree of a DC voltage pulsation detecting and amplifying circuit, is provided to change the amplification degree. CONSTITUTION:In a conduction ratio command producing means 8, the output of a power source current detecting and amplifying circuit 7 is subtracted from a conduction ratio commanding value when the output of the same circuit 7 is positive while the output of the same circuit 7 is added when the output of the same is negative. When the output of pulsation of a DC voltage pulsation detecting and amplifying circuit 17 is non-inversion, the output is added while the output is subtracted to operate a switching element by the flow ratio commanding value when the output is inversion. A DC voltage pulsation correcting means 18, outputting a DC voltage pulsation correcting gain GS which becomes the amplification degree of the DC voltage pulsation detecting and amplifying circuit 17, is provided and the amplification degree is changed by a DC voltage pulsation correcting means 18. According to this method, a power factor may be improved without using any AC current commanding waveform and the pulsation of a DC voltage may be restrained at the same time. |
