DEVICE FOR CONVERTING A SMOOTHING FILTER INTO A THREE-PHASE RESONANT FILTER Russian patent published in 2023 - IPC H02M1/10 

FIELD: electrical engineering.

SUBSTANCE: invention can be used in circuits of generalized converters that alternately perform the functions of a rectifier and an inverter. The technical result of the claimed invention is to expand the functionality of the device. The device contains: DC relay with NO and NC contacts; three-phase alternating current relay with NO contacts and one NC; DC input and output terminals; input and output terminals of three-phase alternating current; a throttle containing the first, second and third equal parts; a capacitor containing the first, second and third capacitors of equal capacity. In this case, the DC relay is activated in the rectification mode, with the help of its closing contacts, a smoothing filter circuit is formed, in which all parts of the inductor are closed in series, and all three capacitors are connected in parallel, and the AC relay is turned off by the opening contacts of the DC relay.

EFFECT: when a three-phase current appears, an AC relay is activated and a resonant filter circuit is formed, while the coils of the first, second and third parts of the inductor are switched on by closing.

1 cl, 1 dwg