A circuit arrangement, a method for operating a circuit arrangement and a switching device

Abstract

The invention relates to a circuit arrangement (100) for evaluating at least two switching states of an actuating element, having: a movable contact arrangement (110) connectable to the actuating element; a second voltage divider comprising a first voltage divider An evaluation circuit (140a) having a first node (K1a, K2a, K3a, K4a, K5a) and a first pickup for picking up a first output signal (A1, A3, A5) of the first evaluation circuit (140a) Point (150a); at least one second evaluation circuit (140b) comprising a second voltage divider with second nodes (K1b, K2b, K3b, K4b, K5b) and a pick-up for the second evaluation circuit (140b) Second pick-up points (150a) for second output signals (A2, A4, A6); first contact surfaces (121a, 122a, 123a, 124a, 125a), each electrically connected to one of the first nodes (K1a to K5a) one, and second contact surfaces (121b, 122b, 123b, 124b, 125b), each electrically connected to one of the second nodes (K1b to k5b), via the movable contact means (110), according to the switching of the actuating element state, at least one of the first contact surfaces (121a to 125a) and / or at least one of the second contact surfaces (121b and 125b) may be electrically connected to a predetermined reference potential (P). The invention also relates to a method for operating a circuit arrangement (100) and a switching device comprising the circuit arrangement (100).

Description

technical field [0001] The invention relates to a circuit arrangement for evaluating at least two switching states of an actuating element, having a movable contact device connectable to the actuating element, a first evaluation circuit having a first voltage divider, having A first node and a first tap for extracting a first output signal of the first evaluation circuit; at least one second evaluation circuit with a second voltage divider having a second node and a first tap for extracting the second evaluation circuit Second taps of two output signals; first contact surfaces, which are respectively electrically connected to one of the first nodes; and second contact surfaces, which are respectively electrically connected to one of the second nodes, wherein, through the movable contact means, according to The switching state of the actuating element, at least one of the first contact surfaces and / or at least one of the second contact surfaces may be electrically connected to ...

AI Technical Summary

Problems solved by technology

[0005] In such circuit arrangements, however, the diagnostic capability and robustness to common faults or types of faults on circuit arrangements is no longer sufficient, especially in this regard to meet the latest requirements of car manufacturers

For example, in known circuit arrangements, faults in the form of short circuits between two mechanically adjacent contact surfaces cannot be reliably detected

However, since the design of the contact surfaces means that they are arranged very close to each other, that is to say separated by a small insulating distance, they cannot be protected against short circuits with sufficient reliability, e.g. due to abrasion, condensation, dust or other conductive foreign bodies

If a short circuit occurs between the contact surface on the first evaluation circuit and the contact surface on the second evaluation circuit, the fault detection rate is limited even further

Furthermore, the fault detection rate is further limited if not only pure short circuits, i.e. contact resistances of approximately 0 ohms, but also soft short circuits, i.e. any parasitic resistance between the two contact surfaces are considered

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