FILTERING DEVICE Russian patent published in 2004 - IPC

FIELD: converter engineering; energy converters used as dc and quasi-sinusoidal voltage generating stages. SUBSTANCE: device has first group of terminals with plus and minus terminals for connecting rectified voltage supply as well as first, second, and third terminals for connecting three-phase nonsinusoidal voltage supply; second group of terminals incorporating plus and minus terminals for connecting dc current loads; first, second, and third terminals for connecting three-phase loads; first through third reactors; first through third capacitors; relay unit incorporating dc relay that controls first through tenth making contacts and first breaking contact, and ac relay that controls eleventh through twenty-second making contacts and second breaking contact. Same filter elements form three-section ripple filter or three-phase resonant filter in response to operation of dc relay or three-phase ac relay, respectively. EFFECT: enlarged functional capabilities. 1 cl, 1 dwg