Patent ID: 7583047

Claim:
A quenching device for a converter bridge with line regeneration, the converter bridge which is activated with ignition pulses by a network-timed control circuit and having three inputs connected to the phases of a three phase network and having two outputs connected to a DC motor that injects current into the three-phase network when operated as a generator, where the quenching device is activated by a trigger unit configured to emit trigger pulses, comprising: at least a pair of quenching condensers, each condenser of the pair of quenching condensers assigned to a bridge half and chargeable to a defined quenching voltage by a respective charging circuit; a plurality of switches that connect the quenching condensers to the respective assigned bridge halves, wherein the plurality of switches connect the quenching condensers to the respectively assigned bridge halves based on activation by the trigger unit; a plurality of diodes arranged in a six-pole bridge circuit in the connections of the quenching condensers where points of the bridge are connected to the phases of a three phase network; and a protective condenser connected in parallel circuit with a voltage limiter and connectable to a DC output of the bridge via controlled switches, wherein: the protective condenser is permanently connected to the DC side of the six diodes arranged in a bridge circuit via two diodes.