Adaptive impedance tuning in wireless power transmission

A wireless power and voltage technology, applied to circuits, inductors, electrical components, etc., can solve problems such as low efficiency

Active Publication Date: 2012-03-28
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since wireless power transmission is generally less efficient than wired transfer, efficiency is of greater concern in wireless power transfer environments

Method used

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  • Adaptive impedance tuning in wireless power transmission
  • Adaptive impedance tuning in wireless power transmission
  • Adaptive impedance tuning in wireless power transmission

Examples

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Embodiment Construction

[0022] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

[0023] The detailed description set forth below in conjunction with the accompanying drawings is intended as a description of exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The term "exemplary" is used throughout this description to mean "serving as an example, instance or illustration" and should not necessarily be construed as preferred or advantageous over other exemplary embodiments. The detailed description includes specific details for the purpose of providing a thorough understanding of the exemplary embodiments of the invention. It will be readily apparent to those skilled in the art that the exemplary embodiments of the invention may be practiced...

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Abstract

Exemplary embodiments are directed to wireless power. A wireless power receiver includes a receive antenna for coupling with near field radiation in a coupling-mode region generated by a transmit antenna operating at a resonant frequency. The receive antenna generates an RF signal when coupled to the near filed radiation and a rectifier converts the RF signal to a DC input signal. A direct current (DC)-to-DC converter coupled to the DC input signal generates a DC output signal. A pulse modulator generate a pulse-width modulation signal to the DC-to-DC converter to adjust a DC impedance of the wireless power receiver by modifying a duty cycle of the pulse-width modulation signal responsive to at least one of a voltage of the DC input signal, a current of the DC input signal, a voltage of the DC output signal, and a current of the DC output signal.

Description

[0001] Claim of priority under 35 U.S.C. §119 [0002] This application claims priority under 35 U.S.C. § 119(e) to the following applications: [0003] U.S. Provisional Patent Application 61 / 162,157, filed March 20, 2009, entitled "WIRELESS POWER IMPEDANCE CONTROL," and [0004] US Provisional Patent Application 61 / 176,468, entitled "DC-BASED ADAPTIVE TUNING," filed May 7, 2009. technical field [0005] The present invention relates generally to wireless power transfer, and more particularly to devices, systems and methods related to adaptively tuning impedance in a receiver device to improve wireless power transfer. Background technique [0006] Typically, each battery powered device (eg, wireless electronic device) requires its own charger and power source, typically an alternating current (AC) power outlet. Such wired configurations become inconvenient to use when many devices need to be charged. [0007] Methods are being developed that use over-the-air or wireless ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J17/00
CPCH02J17/00H04B5/0037H04B5/0093H02J50/12H02J50/20H02J50/40H02J50/60H02J50/80H02J50/90H02J50/70H01F38/14
Inventor 威廉·H·范诺瓦克斯坦利·S·通丘欧内斯特·T·奥萨基查尔斯·E·惠特利三世
Owner QUALCOMM INC
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