Insulation resistance monitoring for vehicles with high-voltage power net
First Claim
1. A method of monitoring insulation resistance between a high-voltage power net and a low-voltage power net, the high-voltage power net and the low-voltage power net being included within a vehicle, the low-voltage power net being grounded to a first ground and the high-voltage power net being grounded to a second ground, the second ground floating relative to the first ground, the method comprising:
- generating a test signal in a digital format;
converting the test signal in the digital format into an analog test signal;
applying the analog test signal to the high-voltage power net;
converting the analog test signal applied to the high-voltage power net into a digital reference signal;
measuring an output frequency response of the high-voltage power net to the analog test signal applied to the high-voltage power net while the high-voltage power net is active; and
comparing the output frequency response to a frequency domain representation of the digital reference signal to determine whether a desired insulation resistance is provided between the high-voltage power net and the low-voltage power net.
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Accused Products
Abstract
A monitor for monitoring isolation resistance, impedance, or other isolation reflective conditions between vehicle systems as contemplated. The monitor may be useful in assessing insulation resistance between a high-voltage power net and a low-voltage power net. The monitor may be configured to assess a sufficiency of the insulation resistance based on a frequency response of the high-voltage power net.
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Citations
12 Claims
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1. A method of monitoring insulation resistance between a high-voltage power net and a low-voltage power net, the high-voltage power net and the low-voltage power net being included within a vehicle, the low-voltage power net being grounded to a first ground and the high-voltage power net being grounded to a second ground, the second ground floating relative to the first ground, the method comprising:
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generating a test signal in a digital format; converting the test signal in the digital format into an analog test signal; applying the analog test signal to the high-voltage power net; converting the analog test signal applied to the high-voltage power net into a digital reference signal; measuring an output frequency response of the high-voltage power net to the analog test signal applied to the high-voltage power net while the high-voltage power net is active; and comparing the output frequency response to a frequency domain representation of the digital reference signal to determine whether a desired insulation resistance is provided between the high-voltage power net and the low-voltage power net. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A circuit operable to assess insulation resistance of a high-voltage power net included within a vehicle, the circuit comprising:
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a controller operable to output a test signal in a digital format; a digital-to-analog converter operable to convert the test signal in the digital format to an analog test signal; a positive sensor and interface circuit operable to output the analog test signal to a positive bus of the high-voltage power net; a negative sensor and interface circuit operable to output the analog test signal to a negative bus of the high-voltage power net; an analog-to-digital converter operable to convert the analog test signal into a digital reference signal; a positive analog-to-digital converter operable to convert a positive analog response of the positive bus to the test signal for output as a positive digital response to the controller; a negative analog-to-digital converter operable to convert a negative analog response of the negative bus to the test signal for output as a negative digital response to the controller; wherein the controller determines an output frequency response of the high-voltage power net to the test signal based on at least one of the positive digital response and the negative digital response; and wherein the controller compares the output frequency response to a frequency domain representation of the digital reference signal to determine whether a desired insulation resistance is provided between the high-voltage power net and a chassis of the vehicle. - View Dependent Claims (11, 12)
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Specification