Sensing coil geometry for metal object detection in predetermined spaces with increased sensitivity

A coil and object technology, applied in the field of sensing coil geometry, can solve the problems of sensing coil sensitivity reduction, sensing coil interference, etc.

Active Publication Date: 2021-04-06
WITRICITY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sensitivity of conventional square or rectangular sensing coils is reduced when such a metallic object is approximately at the center of one of these sensing coils and the size of the sensing coil is significantly larger than that of the metallic object.
Furthermore, when the sensing coil is located above the magnetic body of the transmitter of the wireless charging system, the wireless magnetic field generated by the transmitter may cause undesired interference to the sensing coil

Method used

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  • Sensing coil geometry for metal object detection in predetermined spaces with increased sensitivity
  • Sensing coil geometry for metal object detection in predetermined spaces with increased sensitivity
  • Sensing coil geometry for metal object detection in predetermined spaces with increased sensitivity

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Embodiment Construction

[0032] The detailed description set forth below in connection with the accompanying drawings is intended as a description of the embodiments and is not intended to represent the only embodiments in which the invention may be practiced. The term "exemplary" used throughout this specification means "serving as an example, instance or illustration", and is not necessarily to be construed as preferred or advantageous over other embodiments. The detailed description includes specific details for the purpose of providing a thorough understanding of the embodiments. In some cases, some devices are shown in block diagram form.

[0033] Transferring power wirelessly may refer to transferring any form of energy associated with an electric, magnetic, electromagnetic, or other form from a transmitter to a receiver without the use of physical electrical conductors (eg, power may be transferred through free space). Power output to a wireless field (eg, a magnetic field) can be received, ca...

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Abstract

The present disclosure provides systems, methods and devices for detecting the presence of objects. In one aspect, an apparatus for detecting the presence of an object is provided. The device includes a sensing coil formed from a conductor having a predetermined shape configured to attenuate a current induced in the conductor by an external time-varying magnetic field. The sensing coil has electrical characteristics that vary according to the presence of an object. The device includes a detection circuit coupled to the sensing coil and configured to detect the presence of the object in response to detecting a difference between a measured value of the electrical property and a reference value of the electrical property. In the absence of an object above at least a portion of the sensing coil, the reference value of the electrical characteristic is substantially the same as the measured value of the electrical characteristic.

Description

technical field [0001] The present disclosure relates generally to wireless power transfer, and more particularly to sensing coil geometry with improved sensitivity for metal object detection in a predetermined space. Background technique [0002] Wireless charging systems are capable of transferring power in free space, for example, by wireless magnetic fields, for charging electric vehicles. However, the wireless magnetic field may induce eddy currents in any metallic objects located within a predetermined space near the wireless charging system. This eddy current causes metallic objects to heat up and can damage components of the wireless charging system. The presence of such metallic objects can be determined using a sensor system including multiple sensing coils, thereby reducing or interrupting wireless power transfer accordingly. However, the sensitivity of conventional square or rectangular sensing coils is reduced when such a metallic object is located approximate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/60H02J50/10H02J7/00H02J5/00G01V3/10B60L53/124B60L53/122B60L53/126B60L53/38B60L53/36
CPCH02J5/005H02J7/025H02J50/10H02J50/60G01V3/101H02J50/12H02J50/90H02J50/80Y02T90/12Y02T10/7072Y02T90/14B60L53/38B60L53/36B60L53/124H02J7/0042B60L53/126B60L53/122H02J2310/48Y02T10/70G01V3/10
Inventor S·乔普拉L·A·珀西博恩M·维尔纳
Owner WITRICITY CORP
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