Built-in test injection for current sensing circuit
US9146294B2 · kind B2 · utility
1Cited by
1References
11Claims
0Family size
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Key dates
| Filing date | Jul 19, 2012 |
| Grant date | Sep 29, 2015 |
| Priority date | — |
| Expiry date | Mar 23, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A current sense system includes a current transformer having a primary coil and a secondary coil, wherein the secondary coil has a first and second terminal; a burden resistor connected between the first terminal of the secondary coil and ground; a monitor circuit that measures current in the primary coil by monitoring voltage across the burden resistor; and a built-in test (BIT) circuit connected to the second terminal of the secondary coil. The BIT circuit provides a virtual ground during normal operation, and either a positive voltage or a negative voltage during test operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.