Patent ID: 9594119
Date: 2017-03-14
CPC Classifications: G01R,H01H

Claim:
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: