Circuit arrangement and process for detecting a switch position

摘要

A circuit arrangement for detecting a switch position includes a first node configured to be connected to one phase of a power network, a third node, and a micro-controller. A switch is arranged between the first node and the third node. A resistor is arranged parallel to the switch between the first node and the third node. A connection on the micro-controller is connected to the third node. The micro-controller is programmed to compare a voltage present at the connection against a reference voltage and to determine from this comparison whether the switch is open or closed.

主权项

1. A circuit arrangement for detecting a switch position, comprising:
a first node configured to be connected to a phase of an electrical grid; a second node configured to be connected to a neutral conductor of an electrical grid; a third node; a fourth node connected to a ground potential; a switch connected between the first node and the third node, the switch being configured to establish a current path from the first node to the third node when the switch is closed; a Zener diode having an anode connected to the fourth node and a cathode connected to the third node; a capacitor arranged between the third node and the fourth node; a first resistor arranged in parallel with the switch between the first node and the third node; a second resistor and a diode connected in series between the fourth node and the second node; and a microcontroller connected to a voltage the third node, a ground connection of the microcontroller being connected to the fourth node, the microcontroller being configured to:
compare the voltage at the third node with a predetermined reference voltage; anddetermine, on the basis of said comparison, whether the switch is open and whether the switch is closed.