Circuit device and method for ascertaining a state of a locking conductor loop

Abstract

The invention relates to a circuit device (SV) for ascertaining a state of an electric locking conductor loop (VS) for monitoring a high-voltage component (HK), comprising: - a current connection (SA1) for electrically connecting to a voltage source; a ground connection (ML) for electrically connecting to an electric ground (MS); a positive connection (PA) for electrically connecting to a line end (LE1) of the locking conductor loop (VS); a negative connection (NA) for electrically connecting to another line end (LE2) of the locking conductor loop (VS); a measuring arrangement (MA) for measuring the voltage potential ([phi]) at the negative connection (NA) when two different currents (I1, I2) are flowing from the current connection (SA1) to the ground connection (ML) via the negative connection (NA); and a detection arrangement (EA) which comprises a comparison unit (KP) for comparing each of the two voltage potential ([phi]) measurement values ([phi]1, [phi]2) measured for the two currents (I1, I2) with two specified potential reference values (Ur1, Ur2 or Ur3, Ur4) and which is designed to detect whether the negative connection (NA) is electrically short-circuited with the positive connection (PA), the current connection (SA1), the ground connection (ML), or none of these connections (PA, SA1, ML) on the basis of the comparison results of the comparison unit (KP).

Description

technical field [0001] The invention relates to a circuit arrangement for determining the state of a locking ring, wherein the locking ring is designed for monitoring high-voltage components. Furthermore, the invention relates to a touch protection circuit with the aforementioned circuit arrangement and the aforementioned locking ring, as well as to a vehicle with the aforementioned touch protection circuit. Furthermore, the invention relates to a method for determining the state of the aforementioned locking ring. Background technique [0002] Modern vehicles (especially hybrid or electric vehicles) include high-voltage on-board electrical network branches or high-voltage components, such as traction batteries, electric motors, power electronics and / or supercapacitors, which operate at voltages well above 60 volts and even 450 volts. Voltages above 60 volts are life-threatening for humans and animals. These high-voltage components are therefore equipped with various touc...

AI Technical Summary

Problems solved by technology

[0004] If there is a fault in these touch protection circuits (especially in the interlocking ring), it can happen that high-voltage components are incorrectly deactivated in non-hazardous situations or, conversely, are not reliably deactivated in dangerous situations. deactivated and therefore a hazard to humans and animals

Images