Multi-level active filter
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United States of America Patent
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Jul 29, 2008
Grant Date -
May 17, 2007
app pub date -
May 16, 2006
filing date -
May 17, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multi-phase active filter includes a group of power cells electrically connected in a three-phase configuration, a precharging circuit, and a controller that controls the voltage delivered to the plurality of power cells. Each power cell includes an inverter having a pair of direct current (DC) terminals, at least one capacitor electrically connected in parallel with the inverter, and an energy dissipating circuit that is electrically connected in parallel with the inverter. The energy dissipating circuit of each power cell self-regulates DC voltage within the cell.
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