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Selectively controllable electromagnetic shielding

An electromagnetic shielding and selective technology, applied in the fields of magnetic field/electric field shielding, partial shielding, circuits, etc., can solve the problems of magnetic field broadcasting, occurrence, etc.

Inactive Publication Date: 2013-05-15
ACCESS BUSINESS GRP INT LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conversely, if the electronic algorithm does not include shutting down of the system at one location when multiple devices are being charged, broadcasting of the magnetic field into the surrounding environment may occur, with its detrimental effects

Method used

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  • Selectively controllable electromagnetic shielding
  • Selectively controllable electromagnetic shielding
  • Selectively controllable electromagnetic shielding

Examples

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Embodiment Construction

[0051] exist figure 1 A wireless power system incorporating an embodiment of the present invention is shown in . Wireless power system 10 generally includes wireless power supply 12 and remote device 14 . The wireless power supply 12 of this embodiment includes a primary coil 16 , a primary driver 18 and an intermediate magnetic shield 20 . In use, the primary driver 18 applies an alternating signal to the primary coil 16 to generate a magnetic field. The remote device 14 of this embodiment includes an electronic load 22 , a secondary coil 24 and a permanent magnet 26 . When an appropriate magnetic field is present, a current is induced in the secondary coil 24 to power the electronic load 22 . This induced power may be used to charge and / or directly power remote device 14 . The illustrated intermediate shield 20 is a magnetic shield capable of being selectively saturated by a magnetic field to provide holes in the shield. In the unsaturated state, the intermediate shield...

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Abstract

A selectively controllable electromagnetic shield having an electromagnetic shielding material and a mechanism for selectively generating an aperture in the shield. The mechanism for selectively generating an aperture in the shield may be a magnetic field source that generates a magnetic field of sufficient strength to substantially saturate all or a portion of the shielding material. For example, a permanent magnet or DC electromagnet may be used to selectively saturate the shield. In its un-saturated state, the magnetic shield has a high permeability so that it draws much of the electromagnetic field into itself and functions as a flux path for the magnetic field. In effect, the shield directs the flow of much of the magnetic field through the shield so that the amount of the field passing from one side of the shield to the other is dramatically reduced. Once saturated, the permeability of the shield is substantially reduced so that the magnetic field lines are no longer drawn into the shield to the same degree. As a result, once saturated, the effectiveness of the shield in the saturated region is reduced and a substantially greater amount of the electromagnetic field may flow through or around the shield in the region saturated by the magnet.

Description

technical field [0001] The present invention relates to electromagnetic shielding, and more particularly to systems and methods for providing selective control of electromagnetic shielding. Background technique [0002] Efforts to realize wireless power transfer systems in commercial and residential settings have broadly increased in recent years. Wireless power systems offer the prospect of eliminating power / charging cords for a wide range of powered devices, including not only handheld electronic devices such as cellular phones, media players, wireless headsets, and personal digital assistants, but also higher Power equipment such as appliances, tools and electric vehicles. Efficient inductive power transfer has become an area of ​​increasing scientific interest because it can solve certain problems associated with traditional wired or contact power transfer. These include but are not limited to corrosion, mechanical friction, mess and impracticality in places such as un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00H02J7/02G01R33/421
CPCH02J7/025H05K9/002H01F38/14H05K9/0088B60L11/182Y02T90/14H01F27/362Y02T90/122Y02T10/7088G01R33/421Y02T10/7005Y02T10/7072Y10T29/49002H04B5/00B60L53/126B60L53/124H02J50/10H01F27/36Y02T10/70H01F27/366H02J50/70B60Y2200/24B60Y2200/14B60Y2200/11H02J50/80H02J50/12Y02T90/12
Inventor D.W.巴曼W.T.小斯托纳J.K.施万内克K.J.特纳B.C.梅斯
Owner ACCESS BUSINESS GRP INT LLC
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