Patent ID: 8098031

Claim:
Active braking unit for recirculating energy that is produced during the braking of electric motors ( 2 ) to a supply system ( 1 ) with a forward branch ( 3 ), comprising a rectifier ( 32 ) that is attached to the supply system ( 1 ), said rectifier being guided via a first intermediate circuit ( 33 ) to a first inverter ( 34 ), which is connected to the motor ( 2 ), and a reverse branch ( 4 ), comprised of a second intermediate circuit ( 42 ), which is connected to the output of the first intermediate circuit ( 33 ) and has a second inverter ( 41 ) connected to it, which second inverter is connected via a system adapting circuit ( 5 ) and/or other system coupling means to the supply system ( 1 ), characterized in that each pole of the second intermediate circuit ( 42 ) is connected to the output of the first intermediate circuit ( 33 ) via a series connection of a current-compensated choke ( 61 , 62 ) and a diode ( 64 , 65 ).