Patent · US Active

DC and AC current detection circuit

US8975890B2 · kind B2 · utility

0Cited by
5References
7Claims
0Family size

Assignee

Inventor

Key dates

Filing dateSep 21, 2011
Grant dateMar 10, 2015
Priority date—
Expiry dateMay 30, 2032

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01R15/183
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A circuit for detecting a DC current in a conductor (L1) includes a current transformer (CT) having a ferromagnetic core (10), a primary winding comprising the conductor (L1) and at least one secondary winding (W1). The circuit further includes an oscillator (12) for supplying an oscillating signal across the secondary winding and means for detecting a dc offset in the current flowing in the oscillator circuit. The circuit includes a capacitor (C1) in series with the secondary winding, and the detecting means is arranged to detect a non-zero voltage across the capacitor above a certain level.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.