LINE FILTER Russian patent published in 2018 - IPC H02M1/12 

FIELD: electricity.

SUBSTANCE: according to the invention the line filter comprises of a core coil inserted in the raptures of line wires, of capacitors incorporated between the line wires, of cored ballast inductors connected in a series circuit on which control windings are mounted. One terminal of the ballast inductor circuit is connected to one of the line wires, electronic dongles connected between one of the line wires and the first terminals of the control winding, the second terminals of which are connected to one of the line wires, electronic switches cut in parallel to the ballast inductors, a threshold control device connected to the line wire inputs through their inputs and to the electronic switches and dongles through their outputs and their outputs connected to electronic switches and keys. The total number of incoming and outgoing line wires is equal to three. The inductance coils cut in a rapture of line wires in pairs are connected to the outgoing line wires in the filter output. Bias coils installed in the circuit of each of the three line wires are mounted on a common core with relevant inductance coils and connected to the output of the corresponding line wire through one terminal and to the second output of the corresponding circuit of ballast inductors through the other terminal.

EFFECT: prevention of step current change of a three wire network, symmetrization of load voltage.

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