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Wireless charging foreign object detection device, method and wireless charging system

A technology of foreign object detection and wireless charging, which is applied to radio wave measurement systems, measurement devices, circuit devices, etc., to improve the effect of detecting blind spots

Active Publication Date: 2022-03-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the above deficiencies, the present invention provides a vertical foreign object detection coil structure mainly to detect the horizontal magnetic field above the transmitting coil, which solves the problem of "detection blind spot"

Method used

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  • Wireless charging foreign object detection device, method and wireless charging system
  • Wireless charging foreign object detection device, method and wireless charging system
  • Wireless charging foreign object detection device, method and wireless charging system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] Exemplarily, Fig. 3(a) illustrates a structure of a foreign object detection coil, the transmitting coil is a horizontally wound disc coil, and the winding plane of the transmitting coil 100 is the first plane P 1 , the winding plane of the single-turn detection coil 103 is the second plane P 2 , that is, the winding plane of the coil, and the second plane is perpendicular to the first plane.

[0133] Exemplarily, Fig. 3(b) illustrates a structure of a foreign object detection coil, the transmitting coil is a solenoid coil wound vertically, and the orthogonal plane of the winding plane of the transmitting coil 100 is the first plane P 1 , the winding plane of the single-turn detection coil 103 is the second plane P 2 , that is, the winding plane of the coil, and the second plane is perpendicular to the first plane.

[0134] In fact, the detection coil will couple the eddy current magnetic field generated by the foreign object 301 above the detection coil, causing ...

Embodiment 2

[0137] Exemplarily, Fig. 4(a) illustrates a structure of a foreign object detection coil, the transmitting coil is a horizontally wound disc coil, the winding plane of the transmitting coil 100 is the first plane, and the detection coil 103 is configured to detect multi-dimensional The magnetic induction intensity; the multi-dimensional magnetic field is a magnetic field in at least two directions that do not overlap;

[0138] Exemplarily, Fig. 4(b) illustrates a structure of a foreign object detection coil, the transmitting coil is a solenoid coil wound vertically, the winding plane of the transmitting coil 100 is the first plane, and the detecting coil 103 is configured to detect multiple The magnetic induction intensity of the dimension; the multi-dimensional magnetic field is the magnetic field of at least two directions that do not overlap;

[0139] For example, when the transmitting coil 100 is a symmetrical circular coil, the magnetic field is symmetrical about the z ax...

Embodiment 3

[0146] Exemplary, Figure 5 A foreign object detection coil structure is exemplified. The difference from Embodiment 1 is that each of the six detection coils 103 is perpendicular to the first plane. In fact, the detection coil will couple the eddy current magnetic field generated by the foreign object 301 (such as the metal inside the plush toy) above the detection coil, causing one of the voltage signal of the foreign object detection coil and the current signal of the foreign object detection coil to change. Therefore, by detecting at least one of the above signals, it can be used to determine whether there is a foreign object.

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Abstract

The invention provides a wireless charging foreign object detection device, method and wireless charging system, belonging to the technical field of wireless charging. Foreign matter close to the top of the transmitting coil will heat up severely, but the traditional foreign object detection scheme based on longitudinal magnetic field detection has the problem of "detection blind zone" above the transmitting coil. The invention provides a vertical foreign object detection coil structure mainly for detecting the horizontal magnetic field above the transmitting coil, which solves the problem of "detection blind spot". In addition, because the horizontal magnetic field attenuates slowly with height, the structure of the present invention has the ability to detect space foreign objects at a certain height. The invention can realize the detection of foreign matter, effectively warn the safety hazard caused by foreign matter, and provide safety for electric vehicles, electronic products, automatic guided transport vehicles, drones, logistics robots, and automatic driving equipment with wireless charging and wireless power supply systems. Assure.

Description

technical field [0001] The present application relates to the technical field of wireless charging, and in particular to a wireless charging foreign object detection device, method and system. Background technique [0002] Wireless charging technology has been applied to electric vehicles, electronic products, automated guided vehicles (AGV, Automated Guided Vehicle), drones, logistics robots, autonomous driving and other fields, especially where automatic charging is required. Compared with contact power supply, wireless power supply has the advantages of safety, flexibility, no spark, less maintenance, mobility and easy automatic charging. A number of wireless charging related technologies and patents have been published, such as: for the non-contact transformer structure, the published patents "CN104319076B A non-contact transformer (Chen Qianhong, Hou Jia, etc.)" and "CN101630577A Edge-extended high coupling coefficient non-contact Transformers (Zhang Wei, Chen Qianhong...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/60H02J50/10H02J7/00G01V3/10
CPCH02J50/60H02J50/10H02J7/0047H02J7/0029G01V3/10G01V3/105
Inventor 陈乾宏张斌徐立刚温振霖任小永张之梁
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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