Circuit arrangement and method for operating the circuit arrangement

Abstract

The invention relates to a circuit arrangement (1) having a controller (2) with a binary input (6) for detecting the switching state of a corresponding switch (8), wherein the input (6) ) is connected to a pull-down resistor (14), which achieves a low heat generation in all possible operating states while detecting possible switching states particularly reliably. For this purpose, according to the invention, the pull-down resistor (14) is a cold conductor.

Description

technical field [0001] The invention relates to a circuit arrangement having a controller with at least one binary input. It also relates to the corresponding operating method. Background technique [0002] In many cases, control devices or controllers with binary inputs are used for controlling the motors. An example of this is a so-called motor control unit (MCU). The release and feedback of the corresponding switching device or switch are queried via its binary input and a command for operating the motor is given. Typically, the type of input is "active high", which switches from a logic 0 (low) to 1 (high) from a certain switching threshold (usually eg 0.5*control voltage) under the condition of an applied potential. Release, feedback and commands are guided by various switching elements such as auxiliary switches, signaling switches and position switches, as well as by clamping positions. [0003] Since this is a binary input with a generally high input impedance (u...

AI Technical Summary

Problems solved by technology

If the control unit is used under harsh climatic ambient conditions (e.g. off-shore, coastal, heavily polluted air, extreme air humidity), leakage paths (Kriechwege) can form which reduce the insulation resistance

This can lead to potential propagation at the switching element as well as at the clamping position, which can lead to undesired release and control commands

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