Patent ID: 7705580

Claim:
A system for smoothing an output voltage of a power generator, the output voltage containing frequency components, the system comprising: a filter circuit to which the output voltage is input, the filter circuit comprising: a semiconductor substrate having an island portion therein; a first capacitor having opposing first and second electrodes; a second capacitor having opposing third and fourth electrodes; a first semiconductor switch electrically connected to be series with the third electrode of the second capacitor; and a second semiconductor switch electrically connected to be series with the fourth electrode of the second capacitor, the series-connected first switch, the second capacitor, and the second semiconductor switch constitute a series circuit, the series circuit being electrically connected with the first capacitor in parallel thereto, each of the first and second semiconductor switches being formed in the island portion of the semiconductor substrate, wherein the first semiconductor switch and the second semiconductor switch are configured to have substantially the same amount of leakage current flow during the first and second semiconductor switches being off; and a control circuit electrically connected to the first and second semiconductor switches of the filter circuit and configured to control the first and second semiconductor switches to be substantially simultaneously on and off to thereby cause the filter circuit to filter out the frequency components from the output voltage.