Isolated capacitance line voltage sensor
US10120055B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2014 |
| Grant date | Nov 6, 2018 |
| Priority date | — |
| Expiry date | Mar 28, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Isolated capacitance line voltage sensing is provided that avoids metal-to-metal contact for voltage sensing of a power signal present on a power wire. An external conductor is positioned by the power wire, creating a capacitor with the power wire conductor, insulation, and external conductor. The capacitance is used to measure the electric field, indicating a voltage level for the powered wire. The impedance mismatch caused by the capacitance is transformed. The impedance transformation circuit may be integrated with the external conductor, allowing voltage sensing by a voltage meter having a lower input impedance. A manual or automatic calibration circuit may be provided to ensure the measured voltage represents the actual voltage on the power wire.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.