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Current sensor for measuring an alternating current

  • US 10,545,178 B2
  • Filed: 03/09/2016
  • Issued: 01/28/2020
  • Est. Priority Date: 03/10/2015
  • Status: Active Grant
First Claim
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1. A current sensor (1, 1

  • ) for measuring an alternating current, the sensor comprising;

    at least one electrical coil (5, 50),an electronic unit (6) for conditioning a signal of the at least one electrical coil,an electrical terminal block (7),the at least one electrical coil (5, 50) having a closed contour inscribed within a polygon and delimiting in its center a through window (9) for an electrical conductor crossed by the alternating current to be measured, this conductor being called a primary conductor (2),the at least one electrical coil (5, 50) comprising N rectilinear segments (TR) of width L and N circular sectors (SC) delimited each by an interior arc (10) of interior radius Ri and an exterior arc (11) of exterior radius Re,the rectilinear segments (TR) being connected two by two by a circular sector (SC),the rectilinear segments (TR) being made of turns (12) separated from each other by a constant spacing P, separated from each other on the interior arc (10) by a constant spacing equal to spacing P,wherein the at least one electrical coil (5, 50) is made in a form of a printed circuit provided on at least one electronic board (4) comprising additional turns (13, 15) in its circular sectors (SC) with a width (L1, L2) lower than the width (L) of other turns, called main turns (12), and extending from the exterior arc (11) towards at least one intermediate arc (14, 16) located between the interior arc (10) and the exterior arc (11), the additional turns (13, 15) being inserted between the main turns (12) so that the spacing between two consecutive turns (12, 13, 15) on the exterior arc (11) is substantially equal to spacing P, the N rectilinear segments (TR) and the N circular sectors (SC) have a same width L, in the circular sectors (SC), main turns (12) being separated from each other on the interior arc (10) by a constant spacing equal to spacing P, of rectilinear segments (TR), and main turns (12) and additional turns (13, 15) being separated from each other on the exterior arc (11) by rectilinear segments (TR), so that an average turns density is almost constant in all of the electrical coil (5, 50), and the constant spacing P is chosen the smallest spacing P possible for a given printed circuit technology in circuit sectors (SC) which is implemented in rectilinear segments (TR) in order to maximize the measuring sensitivity of the current sensor (1, 11).

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