Siemens Ag Osterreich

Siemens Aktiengesellschaft

Siemens Österreich

Heinz Pichorner

Franz Wöhrer

Franz Hackl

Thomas Biribauer

Wilfried Hofmüller

Wilhelm Ritschel

Wilhelm Reischer

Grammenos Nicoltsios

Leo Karl

A three-phase AC power controller has three strands, each having an input and an output. Five pairs of valves are connected antiparallel for rotating field reversal. The first input is connected to the first output by way of a first pair, the second input is connected to the second output by way of a second pair and to the third output by way of a third pair, and the third input is connected to the second output by way of a fourth pair and to the third output by way of a fifth pair. An RC half-branch is connected as a snubber circuit to each input and to each output. These RC half-branches are each interconnected via a transverse connection.

Three-phase AC power controller

There is described a method for controlling a quenching device for a converter bridge with line regeneration, whereby the converter bridge controlled by a network-timed control circuit by ignition pulses is connected with its three inputs to the phases of a three-phase network and the two outputs of the bridge are connected to a direct-current motor which feeds, when operated as a generator, current back to the three-phase network via the bridge. The quenching device is controlled by a trigger unit which emits trigger pulses depending on the monitoring of electrical and temporary variables. The quenching device comprises, for each bridge half, a quenching condenser that can be charged by a charging circuit quenching voltage. The quenching condensers, in the event of quenching, can be connected to the bridge halves by means of switches that are controlled by the trigger unit.

Quenching device for a converter bridge with line regeneration

There is described a method for controlling a quenching device for a converter bridge with line regeneration, whereby the converter bridge controlled by a network-timed control circuit by ignition pulses is connected with its three inputs to the phases of a three-phase network and the two outputs of the bridge are connected to a direct-current motor which feeds, when operated as a generator, current back to the three-phase network via the bridge. The quenching device is controlled by a trigger unit which emits trigger pulses depending on the monitoring of electrical and temporary variables. The device has measuring values 'direct output current' and/or 'supply voltages' used to determine characteristic values which are compared with theoretical characteristic values. Depending on the result of said comparison, the quenching device is optionally activated.

A protective circuit (SCH) for a line-commutated thyristor bridge (B, B'), which is designed for feeding energy of a power circuit connected to the bridge and also for feedback from this circuit, and which is connected between the thyristor bridge and the power circuit. In a series branch of the protective circuit, there is at least one IGBT transistor (GTGT), which is biased in the feedback direction with an inverse-parallel diode (DDD), and which can be deactivated for the appearance of a tipping recognition signal (s, U), which is supplied by a control circuit (AST) associated with the transistor.

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Pettendorf, Austria

Heinz Pichorner