High voltage isolation measurement system
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United States of America Patent
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Mar 20, 2018
Issued Date -
N/A
app pub date -
Mar 17, 2015
filing date -
Mar 30, 2014
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The isolation resistance value is determined by measuring the voltage across a set of high resistance resistor networks placed between the high voltage battery pack (both the positive and negative terminals) and the chassis ground and then modifying the resistance networks by switching in an additional high resistance network and repeating the measurements. This results in a system that can be assembled using low cost components to determine with a high degree of accuracy the value of the isolation resistance. The implementation of this system does not require expensive solid state relays, as the small amount of resistance through the switching device is negligible when determining the isolation resistance of the high voltage system. The system is not dependent on high precision devices to give accurate isolation resistance detection in a range that is appropriate for high voltage applications.
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