Dehn + Söhne Gmbh + Co Kg

Thomas Boehm

Peter Igl

Benjamin Moosburger

Hans Herold

The invention relates to a circuit assembly for the state monitoring and logging of overvoltage protection devices or overvoltage protection systems by means of pulse current monitoring, comprising at least one passive RFID transponder having an inductively coupled voltage supply, wherein in the case of an event of the overvoltage protection device or the overvoltage protection system, the RFID transponder antenna circuit is influenced, in particular interrupted, short circuited, or detuned, so that disturbance processes can be identified. According to the invention, a coil Lis provided on a discharge line of the overvoltage protection device or the overvoltage protection system that carries pulse currents that occur, which coil Lis oriented in such a way that the field caused by pulse current passes through the coil winding surface, wherein the coil Lis connected to at least one switching device, which is connected on the antenna circuit of the RFID transponder to the inductor Lthere in order to influence the antenna circuit at least at times.

Circuit assembly for the state monitoring and logging of overvoltage protection devices or overvoltage protection systems

The invention relates to a multi-staged overvoltage protection circuit, in particular for information-technology systems, comprising at least one coarse protection element and at least one fine protection element, wherein the at least one fine protection element can be activated by a triggering device depending on a threshold. According to the invention, the applied operating voltage is led to an evaluation device, which generates a reference voltage. Also provided is an evaluation unit, firstly for checking to see whether the current operating voltage is above the reference voltage, secondly for checking to see whether the voltage excess exceeds a previously determined level, and thirdly for establishing whether the rate of change of the operating voltage is greater than another previously determined value so that a transient overvoltage exists, wherein the triggering device then receives an activation signal from the evaluation device.

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Hohenfels, Germany

Thomas Boehm