Current sensor

US9128128B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• Jeffrey Michael Fries · Grain Valley, US
• Jeffery Armstrong · Palm Bay, US
• Robert N. Bettis · West Melbourne, US
• Bradley Dale Brown · Winnipeg, CA
• Shawn Clark · Melbourne, US
• Gregory K. Hann · Odessa, US
• Mark Bradshaw Kraeling · Melbourne, US
• Steve R. Murphy · West Melbourne, US
• Daniel G. Penny, III · Melbourne, US
• Eric Vorndran · Melbourne, US

Key dates

• Filing date: Jun 10, 2011
• Grant date: Sep 8, 2015
• Expiry date: Feb 27, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R19/20
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

There is provided a voltage or current sensing device. An exemplary voltage or current sensing device includes a drive circuitry configured to deliver a drive current to a magnetic core operably coupled with a conductor, for driving the core to cyclical magnetic saturation. The device also includes sense circuitry configured to receive a voltage signal corresponding to an application current in the conductor. The device also includes signal processing circuitry configured to sample the voltage signal, wherein a first sample is in phase with the drive current and a second sample is out of phase with the drive current. The device also includes a feedback loop configured to deliver a compensation current to the magnetic core, wherein the compensation current is configured to balance the magnetic core and wherein the compensation current is based at least in part on the first sample in phase with the drive current.