Device for detecting a parasitic metallic object in the emission zone of a device for recharging a user apparatus for an automotive vehicle and associated detection method
First Claim
1. A device for detecting a presence of a parasitic metallic object on a reception surface of a device for recharging by induction of a battery of a user apparatus for an automotive vehicle, said recharging device comprising:
- an emission module,a management module, andthe reception surface for the user apparatus,said emission module comprising at least one induction emitting coil type antenna coupled to the reception surface and configured to generate an electromagnetic field around the reception surface in an “
emission”
zone,said management module of the device being configured to detect a presence of the user apparatus on the reception surface and to control the emission moduleat least two identical passive detection coils, situated between the emitting coil and the reception surface;
each coil, a first coil and a second coil forming a continuous loop, open at its ends and comprising a plurality of identical mutually spaced segments connected together by a link,said two coils being superposed, in two parallel planes, and mutually offset by a segment, in such a way that the respective segments of each coil cover distinct surface areas of the reception surface,the segments being disposed in a symmetric manner with respect to one of two perpendicular axes crossing at a center of the reception surface,first means for determining a first quality factor across terminals of the first coil,second means for determining a second quality factor across the terminals of the second coil,third means for determining a third quality factor across terminals of the emitting coil,means of control of the first, second, and third determining means,means of storage of the first, second and third quality factor at predetermined instants,means of calculation of ratios between the first, second and third quality factors stored, or between values of quality factors stored at different predetermined instants,means of comparison between the ratios so as to detect the presence of the parasitic metallic object on the reception surface.
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Accused Products
Abstract
A device for detecting the presence of a parasitic metal object on a reception surface of a device for recharging a user apparatus for an automotive vehicle, the device including an antenna of the emitting coil type and: at least two identical passive detection coils, situated between the emitting coil and the reception surface; a determiner for determining the quality factor across the terminals of the two coils, and of the emitting coil; a controller; a storage device for storing the quality factors at predetermined instances; a calculator for calculating ratios between the stored quality factors, or between values of the quality factors stored at different predetermined instances; a comparator for comparing between the ratios in order to detect the presence of an interfering metal object on the reception surface.
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Citations
11 Claims
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1. A device for detecting a presence of a parasitic metallic object on a reception surface of a device for recharging by induction of a battery of a user apparatus for an automotive vehicle, said recharging device comprising:
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an emission module, a management module, and the reception surface for the user apparatus, said emission module comprising at least one induction emitting coil type antenna coupled to the reception surface and configured to generate an electromagnetic field around the reception surface in an “
emission”
zone,said management module of the device being configured to detect a presence of the user apparatus on the reception surface and to control the emission module at least two identical passive detection coils, situated between the emitting coil and the reception surface; each coil, a first coil and a second coil forming a continuous loop, open at its ends and comprising a plurality of identical mutually spaced segments connected together by a link, said two coils being superposed, in two parallel planes, and mutually offset by a segment, in such a way that the respective segments of each coil cover distinct surface areas of the reception surface, the segments being disposed in a symmetric manner with respect to one of two perpendicular axes crossing at a center of the reception surface, first means for determining a first quality factor across terminals of the first coil, second means for determining a second quality factor across the terminals of the second coil, third means for determining a third quality factor across terminals of the emitting coil, means of control of the first, second, and third determining means, means of storage of the first, second and third quality factor at predetermined instants, means of calculation of ratios between the first, second and third quality factors stored, or between values of quality factors stored at different predetermined instants, means of comparison between the ratios so as to detect the presence of the parasitic metallic object on the reception surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification