DEVICE FOR ELECTRIC BRAKING OF ELECTRIC TRAIN Russian patent published in 2006 - IPC B60L7/22 

FIELD: electrical engineering; traction electric drive.

SUBSTANCE: proposed device contains supply source and two groups of dc traction motors. Windings of armatures and field windings of electric motors are connected into cross bridge circuit. Brake resistor is placed in bridge diagonally opposed pair of junctions. Moreover, diode, two contractors, thyristor generative resistor, two current relays, regenerative relay and matching unit are available. Beginning of armature windings of first group of electric motors is connected with beginning of field windings of second group of electric motors. End of armatures windings of first group of electric motors is connected with anode of diode. Cathode of diode is connected with plus terminal of supply source through series-connected first current relay, regenerative resistor and first contactor. First contactor is shunted by thyristor whose anode is connected with common terminal of regenerative resistor and first contactor and with first output terminal of matching unit. Second output terminal of matching unit is connected with control electrode of thyristor, and input, with regenerative relay output placed between minus and plus terminals of supply source, plus terminal of supply source being connected with thyristor cathode. Second current relay is connected between output of connection of beginning of armature windings of second group of electric motors and ends of field windings of second group of electric motors and minus terminal of supply source. First current relay is made for operation when regeneration current reaches its lower threshold value, and its making contact is placed in circuit of coil of first contactor. Second. Second relay is made for switching off regenerative braking mode when regeneration current reaches upper threshold value.

EFFECT: enlarged range of regenerative braking using regeneration.

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