Active and adaptive field cancellation for wireless power systems

A wireless power and wireless technology, which is applied in some areas where it is undesirable, can solve problems such as bulky and inconvenient connectors

Inactive Publication Date: 2015-10-14
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cables and similar connectors can sometimes be in

Method used

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  • Active and adaptive field cancellation for wireless power systems
  • Active and adaptive field cancellation for wireless power systems
  • Active and adaptive field cancellation for wireless power systems

Examples

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Embodiment Construction

[0026] Magnetic induction can be used to efficiently transfer power wirelessly from a transmitter to a receiver. The transmitter and receiver include antennas tuned to resonate at specific frequencies. The transmitter energizes the transmit antenna with a signal at the resonant frequency, which in turn energizes the receive antenna so that energy can be extracted at the receiver. To the extent that the magnetic field deviates from the resonant frequency of the system, the efficiency of the system can be reduced. Furthermore, out-of-band (ie, not at the resonant frequency of the antenna) emissions can exceed regulatory levels and lead to reduced electromagnetic compatibility and compliance. To improve efficiency and achieve regulatory compliance, active cancellation techniques can be used to cancel unwanted or undesirable electric or magnetic fields. These techniques involve placing the sensor in the near field of the transmitting antenna. Based on the sensed field, the emit...

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Abstract

This disclosure provides methods and apparatus, including computer-readable media, for wireless power transfer and particularly active cancellation of undesirable electric or magnetic field emissions from a wireless power transmitter. In one aspect, the disclosure provides for an apparatus including a sensor, controller, and emitter, wherein the sensor is used to sense the electric or magnetic field emissions from a transmit antenna, the controller configured to determine the undesirable components of the field, and the emitter to generate a field to destructively interfere with the undesirable components.

Description

technical field [0001] The present invention relates generally to wireless power. More specifically, the present invention relates to methods and apparatus that can be used to reduce undesirable portions of sensed electric or magnetic fields. Background technique [0002] An increasing number and variety of electronic devices are powered by rechargeable battery packs. Such devices include mobile phones, portable music players, laptop computers, tablet computers, computer peripherals, communication devices (eg, Bluetooth devices), digital cameras, hearing aids, and the like. While battery technology has improved, battery-powered electronic devices increasingly require and consume greater amounts of power, and thus often require recharging. Rechargeable devices are often charged via a wired connection through a cable or other similar connector that is physically connected to a power supply. Cables and similar connectors can sometimes be inconvenient or bulky, among other di...

Claims

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Application Information

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IPC IPC(8): H02J5/00
CPCH02J17/00H02J5/005H02J50/80H02J50/70H02J50/10H02J50/12H02J7/0049H02J50/60H02J50/90
Inventor 威廉·亨利·范诺瓦克
Owner QUALCOMM INC
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