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Switching state of a mechanical switch

  • US 10,209,311 B2
  • Filed: 11/16/2017
  • Issued: 02/19/2019
  • Est. Priority Date: 11/17/2016
  • Status: Active Grant
First Claim
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1. A circuit for monitoring a switching state of a mechanical switch, the circuit comprising:

  • a first mechanical switch configured to couple a high-voltage power storage device to a load;

    a measuring device configured to measure a voltage characteristic at the first mechanical switch, wherein the measuring device is capable of being switched to the first mechanical switch via a first measuring resistor such that a voltage drop at the first mechanical switch is measurable over a period of time;

    an insulation-monitoring unit having a first switchable resistor, a first switch connected in series with the first switchable resistor, a second switchable resistor, and a second switch connected in series with the second switchable resistor, wherein the first switchable resistor is capable of being switched in, by way of the first switch, during the measurement of the voltage characteristic at the first mechanical switch, wherein the second switchable resistor is capable of being switched in, by way of the second switch, during the measurement of the voltage characteristic at the first mechanical switch, wherein a voltage divider formed by two or more insulation resistors of the high-voltage power storage device is modifiable by the switching in of at least one of the first switchable resistor and the second switchable resistor; and

    an evaluation device configured to compare the measured voltage characteristic at the first mechanical switch with a predefined threshold value such that the switching state of the first mechanical switch is determined.

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