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Foreign-object detecting device, wireless electric-power transmitting device, and wireless electric-power transmission system

A technology for foreign object detection and wireless power transmission, which is applied in radio wave measurement systems, transmission systems, near-field transmission systems, etc., and can solve problems such as shortening the working time of mobile devices.

Inactive Publication Date: 2017-10-20
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the power consumption of a mobile device operating with a battery of a predetermined capacity increases, the operating time of the mobile device becomes shorter

Method used

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  • Foreign-object detecting device, wireless electric-power transmitting device, and wireless electric-power transmission system
  • Foreign-object detecting device, wireless electric-power transmitting device, and wireless electric-power transmission system
  • Foreign-object detecting device, wireless electric-power transmitting device, and wireless electric-power transmission system

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Experimental program
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no. 1 Embodiment approach

[0139] Hereinafter, a foreign object detection device according to a first embodiment of the present invention will be described with reference to the drawings.

[0140] figure 1 It is a block diagram showing the foreign object detection device of the first embodiment. The foreign object detection device includes a foreign object detection circuit 10 and a plurality of detection coils 11a and 11b. Hereinafter, the detection coil will be simply referred to as a coil. The plurality of detection coils 11a and 11b are close to each other on one surface, and lead wires are wound.

[0141] Such as figure 1 As shown, detection coils 11a and 11b are formed by winding a wire, and have outer terminals (marks ●) disposed outside the wound wires and inner terminals (marks ●) disposed inside the wound wires. The outer terminal is a terminal that receives a detection signal from the foreign object detection circuit from outside the detection coil or a terminal that is grounded. The out...

no. 2 Embodiment approach

[0177] Figure 13 It is a block diagram showing the wireless power transmission system of the second embodiment. Figure 13 The wireless power transmission system includes a power transmitting device 30 and a power receiving device 40 . The power transmission device 30 includes a foreign object detection circuit 10 , detection coils 11 a and 11 b , power transmission coils 31 a and 31 b , power transmission circuits 32 a and 32 b , a communication circuit 33 , and a control circuit 34 . The power transmission circuits 32a and 32b generate high-frequency power. The control circuit 34 of the power transmission device 30 controls the foreign object detection circuit 10 , the power transmission circuits 32 a and 32 b , and the communication circuit 33 . The power receiving device 40 includes a power receiving coil 41 , a power receiving circuit 42 , a communication circuit 43 , a control circuit 44 , and a load device 45 . The control circuit 44 of the power receiving device 40...

no. 3 Embodiment approach

[0191] Figure 20 It is a block diagram showing the wireless power transmission system of the third embodiment. Figure 20 The wireless power transmission system includes a power transmitting device 30A and a power receiving device 40 . Power transmission device 30A includes foreign object detection circuit 10 , power transmission coils 31 a and 31 b , power transmission circuits 32 a and 32 b , communication circuit 33 , control circuit 34A, and switch circuit 35 . The control circuit 34A of the power transmission device 30A controls the foreign object detection circuit 10 , the power transmission circuits 32 a and 32 b , the communication circuit 33 , and the switch circuit 35 . Figure 20 The power receiving device 40 with Figure 13 The power receiving device 40 is the same. In the power transmission device 30A, the power transmission coils 31a and 31b are also used as Figure 13 The detection coils 11a and 11b work. That is, the power transmission coils 31a and 31b a...

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PUM

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Abstract

The invention relates to a foreign-object detecting device, a wireless electric-power transmitting device, and a wireless electric-power transmission system. The foreign-object detecting device includes a first coil, a second coil arranged adjacent to the first coil and having the same winding direction as that of the first coil, and foreign-object detecting circuitry. The foreign-object detecting circuitry outputs a first detection signal to an outside or inside terminal of the first coil, outputs a second detection signal having an inverted phase to an outside or inside terminal of the second coil, causes one of the first and second detection signal to flow clockwise, causes the other detection signal to flow counterclockwise to generate a combined magnetic field across a center of the first and a center of the second coil, measures an amount of change in an impedance value of the first or second coils, and determines that a foreign object is present within the combined magnetic field, based on the amount of change.

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of March 20, 2015, an application number of 201510124972.6, and an invention title of "foreign object detection device, wireless power transmission device, and wireless power transmission system". technical field [0002] The present invention relates to a foreign object detection device for detecting foreign objects such as metals and human bodies (animals) in the vicinity of, for example, a wireless power transmission device of a wireless power transmission system. In addition, the present invention relates to a wireless power transmission device and a wireless power transmission system including such a foreign object detection device. Background technique [0003] In recent years, various mobile devices including mobile phones have spread, and the power consumption of mobile devices has continued to increase due to improvements in functions and performance and diver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/10H02J50/10H02J50/60H02J50/00H02J50/40
CPCH02J50/10H02J50/60G01V3/105G01V3/104H04B5/79H04B5/26G01V3/101
Inventor 山本温菅野浩
Owner PANASONIC CORP