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Electromagnetic shielding for wireless power transfer systems

A technology of electromagnetic shielding and wireless charging, applied in circuit devices, preventing/reducing unwanted electrical/magnetic influences, components of transformers/inductors, etc., can solve problems such as low wireless power transmission efficiency

Active Publication Date: 2018-11-09
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This unexpected voltage can lead to inefficient wireless power transfer

Method used

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  • Electromagnetic shielding for wireless power transfer systems
  • Electromagnetic shielding for wireless power transfer systems
  • Electromagnetic shielding for wireless power transfer systems

Examples

Experimental program
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Effect test

Embodiment Construction

[0025] During wireless power transfer in a wireless charging system, various electrical interactions can occur between a transmitter coil and a receiver coil in a wireless charging system. Some of the electrical interactions are intended interactions between the transmitter and receiver coils, while others are unintended interactions that can lead to inefficient power transfer and create problems in electronic devices. For example, figure 1 is a simplified diagram illustrating the electrical interaction between the transmitter coil 102 and the receiver coil 104 of the exemplary wireless charging system 100 during wireless power transfer. The transmitter coil 102 may be disposed within a wireless charging device, such as a wireless charging pad, and the receiver coil 104 may be disposed within a consumer electronic device such as a smart phone, smart watch, tablet, laptop, or the like. The electronic device may rest on the wireless charging device at interface 112 to enable po...

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Abstract

Embodiments describe electromagnetic shielding for wireless charging systems. A wireless charging system includes a transmitter coil configured to generate a magnetic flux, a receiver coil positionedcoaxial with the transmitter coil to receive the generated magnetic flux, where electrical interaction between the transmitter coil and the receiver coil generates electric fields, a transmitter shield positioned between the transmitter coil and the receiver coil to intercept some of the electric fields directed away from the transmitter coil and allow the magnetic flux to pass through the transmitter shield, and a receiver shield positioned between the transmitter shield and the receiver coil to intercept some of the electric fields directed away from the receiver coil and allow the magneticflux to pass through the receiver shield.

Description

[0001] Cross references to related patent applications [0002] This application claims U.S. Nonprovisional Patent Application No. 15 / 701,224 filed September 11, 2017 and U.S. Nonprovisional Patent Application No. 15 / 701,237 filed September 11, 2017 (which claims U.S. Provisional Patent Application No. 62 / 399,082 filed on August 7, 2017, U.S. Provisional Patent Application No. 62 / 542,210 filed on August 7, 2017, U.S. Provisional Patent Application No. 62 / 459,149 filed on February 15, 2017, and 2017 priority of US Provisional Patent Application No. 62 / 542,206, filed August 7, the disclosures of which are hereby incorporated by reference in their entirety for all purposes. Background technique [0003] Electronic devices (eg, mobile phones, media players, electronic watches, etc.) operate when a charge is stored in their batteries. Some electronic devices include rechargeable batteries that can be recharged by coupling the electronic device to a power source through a physical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F38/14H01F27/36H02J50/70
CPCH01F38/14H02J50/70H02J50/10H01F27/36H01F27/361H02J50/402H01F27/2823
Inventor S·艾卡耶姆B·R·加尔巴斯C·S·格拉哈姆K·R·F·拉松
Owner APPLE INC