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AssigneeSiemens Aktiengesellschaft
InventorsManfred Bruckmann, Rainer Marquardt, Rainer Sommer
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Method and apparatus for controlling a turn-off power converter valve having at least two series connections. Each non-latching power semiconductor switch of this power converter valve has an active collector-emitter limiting circuit. When a rising edge of a drive signal that is provided arrives, a predetermined value of the reference limited voltage of the active collector-emitter limiting circuit is decreased to a low value and is increased to the predetermined value again during a turn-off operation. Using a switch-on command, it is possible to balance the voltage sharing on the non-latching power semiconductor switches of a turn-off power converter valve having at least two series connections.
A method for controlling a power converter valve having at least two turn-off non-latching power semiconductor switches which are electrically connected in series, each of the semiconductor switches having an active collector-emitter limiting circuit with a predetermined reference limiter voltage value, the method comprising the steps of (a) when a rising edge of a drive signal arrives, performing a changeover from the predetermined reference limiter voltage value to a lower value;
An apparatus for controlling a turn-off power converter valve having at least two turn-off, non-latching power semiconductor switches which are electrically connected in series, each of the conductor switches comprising a driver stage and a clamping snubber to form an active collector-emitter limiting circuit;
An apparatus for controlling a turn-off power converter valve having at least two turn-off, non-latching power semiconductor switches which are electrically connected in series, each of the conductor switches comprising a driver stage and an active collector-emitterlimiting circuit which has a voltage detection device and a changeover switch, wherein a differential amplifier is provided as the active collector-emitter limiting circuit, wherein the voltage detection device is linked on an input side to a collector terminal of the respective semiconductor switch, wherein the voltage detection device is linked on an output side to an actual value input of the differential amplifier, wherein the differential amplifier is connected on the output side to a control input of the driver stage, wherein a reference input of the differential amplifier is connectable to two reference voltage sources using the changeover switch, and wherein a control signal is present at a control input of the changeover switch.
An apparatus for controlling a turn-off power converter valve having at least two turn-off, non-latching power semiconductor switches which are electrically connected in series, each of the semiconductor switches comprising a driver stage and an active collector-emitter limiting circuit which has a voltage detection device, the voltage detection device being linked on an input side to a collector terminal of the respective semiconductor switch, the voltage detection device being linked on an output side to a control input of the driver stage, wherein a differential amplifier is provided as the active collector-emitter limiting circuit, wherein a reference input of the differential amplifier is linked to a reference voltage source, and wherein a controllable current source is connected on the output side to an actual value input of the differential amplifier.
Dependencies are inferred from the claim text.