System and method for high voltage system isolation resistance measurement
US9720049B2 · kind B2 · utility
Assignees
Inventor
Key dates
| Filing date | Jul 8, 2015 |
| Grant date | Aug 1, 2017 |
| Priority date | — |
| Expiry date | Jan 4, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/3835
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A circuit that measures isolation resistance in a battery pack that is associated with a load includes four resistors. Two resistors are connected between terminals of the battery pack and another two resistors are connected in the load in parallel to the resistors in the battery pack. A controller operates two contactors to disconnect the battery from the load and measure first and second voltages in the battery pack and one of the two resistors. The controller operates the two contactors to connect the battery to the load and measures third and fourth voltages in the battery pack and one of the two resistors. The controller identifies the isolation resistance with reference to resistance values of the four resistors and the first, second, third, and fourth measured voltages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.