Ifm Electronic Gmbh

Other

Jean-Luc Lamarche

Manfred Strobel

Karl Herrmann

Reinhard Albrich

Guntram Rundel

Melnrad Sauter

An oscillator circuit for a sensor, with a tuned circuit and an operational amplifier, the electrical oscillation of the tuned circuit is capable of being tapped between a first terminal and a second terminal of the tuned circuit, and the first terminal of the tuned circuit being connected to the noninverting input of the operational amplifier and the output of the operational amplifier is fed back to the noninverting input of the operational amplifier. The oscillator circuit is designed to improve the dynamic behavior of the oscillator circuit by the second terminal of the tuned circuit &#x2014;at least in terms of AC voltage &#x2014;being directly connected to the inverting input of the operational amplifier.

Oscillator circuit for a sensor

An electronic switching device, which operates without contact, includes a single sensor element (), a clock generator, which can be provided internally or which can be connected externally, an evaluation circuit (), and an electronic or electromechanical switch (), which is provided on an output side. The evaluation circuit () includes diversity processing units (), and a checking unit (), wherein an output signal of the sensor element () is delivered in succession to the processing units (), and that output signals of the processing units () are checked for consistency by the monitoring unit (). Advantageously, with only a single sensor element (), category 4 of EN 954-1 or safety level SIL 3 of EN 61508 requirements can be achieved.

Electronic proximity switching device

A circuit is described for monitoring the faultless state and/or for detecting the faulty state of a cable railway or chairlift system, with a plurality of monitoring and detection devices ( ) and with at least one control and evaluation unit ( ), the monitoring and detection devices ( ) being series-connected to one another and to the control and evaluation unit ( ) and having the potential to be interrogated with respect to their state, especially with respect to their operating state. To be able to meet safety requirements which are as high as possible and at the same time to require only a small installation space, each monitoring and detection device ( ) has several different influence areas ( ) and several signal outputs.

Circuit for monitoring trouble-free state and/or detecting incorrect state of an installation

An electronic proximity switching device with a proximity indicator and with an electronic switch which can be controlled by the proximity indicator. A plurality of these switching devices can be series connected without an unacceptable voltage drop occurring on the series connection when the switching devices are conductive, by the electronic switch of each switching device being connected to one input (2) of an AND element (3), another input (4) of the AND element (3) representing a control input (5) of the switching device, the output (6) of the AND element (3) representing the output (7) of the switching device, and load current flowing via the AND element (3) in the conductive state of the switching device. In other words there is AND element (3) in addition to an inductive proximity switch (1). A circuit for monitoring of the state of a system, for example, a fault state in an aerial railway or chairlift system, is provided with a plurality of switching devices (10), and with a control and evaluation unit (11), the switching devices (10) being series connected to one another and to the control and evaluation unit (11). When a fault state of the system is detected by the series connection of all switching devices (10), the fault can be located by interrogation of the switching devices with respect to their state (make or break contact state).

Electronic switching device and circuits with a plurality of such

An electronic switching device which can be connected via an outside conductor to one pole of a voltage source and only via one other outside conductor to a terminal of a consumer, in which the other terminal of the consumer can be connected to the other pole of the voltage source, therefore a two-wire switching device, with a proximity indicator (1) which can be influenced from the outside, with an electronic switch (3), which can be controlled by the proximity indicator (1) via a switching amplifier (2), and with operating voltage supply circuit (4) for making available the operating voltage required by proximity indicator (1), and optionally by the switching amplifier (2) (=internal operating voltage), the operating voltage supply circuit (4) an having in-phase regulator (5) and proximity indicator (1) and the switching amplifier (2) being connected to the output of the in-phase regulator (5). While in the two-wire switching devices known from the prior art two power components are necessary, in the electronic switching device according to the invention only one power component is necessary, because the operating voltage supply circuit (4) has a shunt controller (6) in addition to the in-phase regulator (5). The input of the shunt controller (6) is connected to the output of in-phase regulator (5), the actuator (7) of shunt controller (6) is in series with electronic switch (3), and the proximity indicator (1) and switching amplifier (6) are also connected to the connection of actuator (7) of shunt controller (6) to electronic switch (3).

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Mittelhausbergen, France

Jean-Luc Lamarche