| 摘要 |
<p>PURPOSE:To suppress the ripple current of a special frequency by inverting the designated frequency components of a ripple voltage contained in a voltage between terminals of a capacitor of a DC filter in a reverse phase and supplying it to a main circuit DC side. CONSTITUTION:An input filter 9 removes a DC component, a high voltage and high frequency pulse voltage from a voltage between the terminals of a capacitor 6. The output voltage of the filter 9 is input through an insulating transformer 10 to a band pass filter 10. The filter 10 selectively produces the special frequency from the input voltage. The output voltage of a band pass filter 11 is applied through an amplifier 12 and a transformer 13 to the input side of a DC filter made of a reactor 5 and a capacitor 6 in series to become in reverse polarity to the ripple voltage of the special frequency of the capacitor 6. Thus, the DC filter can be reduced in size and weight.</p> |
