Switching state of a mechanical switch
First Claim
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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Accused Products
Abstract
A circuit for monitoring a switching state of a mechanical switch is provided that includes a first mechanical switch configured to couple a high-voltage power storage device to a load, a measuring device that measures a voltage characteristic at the first mechanical switch, the measuring device is being connected 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 that can be switched in during measuring such that a voltage divider formed by two or more insulation resistors (R_iso+, R_iso−) of the high-voltage power storage device is modified, and an evaluation device that compares the measured voltage characteristic at the first mechanical switch with a predefined threshold value so that the switching state of the first mechanical switch can be determined.
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Citations
18 Claims
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1. A circuit for monitoring a switching state of a mechanical switch, the circuit comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for monitoring a switching state of a mechanical switch, the method comprising the steps of:
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measuring a voltage characteristic at a first mechanical switch, the first mechanical switch configured to couple a high-voltage power storage device to a load, wherein a voltage drop at the first mechanical switch is measured over a period of time; switching in at least one of a first switchable resistor and a second switchable resistor of an insulation-monitoring unit during the measurement of the voltage characteristic at the first mechanical switch by way of a first switch and a second switch, respectively, wherein the first switch is connected in series to the first switchable resistor, the second switch is connected in series to the second switchable resistor, and a voltage divider formed by at least two insulation resistors of the high-voltage power storage device is modified by the switching in of at least one of the first switchable resistor and the second switchable resistor; and determining the switching state of the first mechanical switch based on the measured voltage characteristic at the first mechanical switch, wherein determining the switching state includes comparing the measured voltage characteristic at the first mechanical switch with a predefined threshold value. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification