Dual-mode wireless power receiver

Patent metadata

Field	Value
Publication number	US-9859744-B2
Application number	US-201414181731-A
Country	US
Kind code	B2
Filing date	Feb 17, 2014
Priority date	Aug 3, 2012
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A dual-mode receiver is provided that includes an electromagnetic resonator having one or more inductive elements that are arranged to form a receiver coil and a network of passive components arranged to form a matching network.

First claim

What is claimed is:

1. A wireless power receiver comprising:
an electromagnetic resonator that includes:
a plurality of inductive elements connected in series and forming a receiver coil; and
a network of passive components comprising a plurality of capacitors arranged to form a matching network, the network of passive components comprising a first capacitor in parallel with a first inductive element of the plurality of inductive elements,

wherein the electromagnetic resonator passively resonates at both a first resonant frequency and a second resonant frequency higher than the first resonant frequency to wirelessly receive power to provide to a rectifier electrically connected to the network of passive components, and
wherein a quality factor of the electromagnetic resonator at both the first and second resonant frequencies is higher than a quality factor for inductive wireless power transfer.

2. The wireless power receiver of claim 1 , wherein the quality factor for inductive wireless power transfer is less than 10.

3. The wireless power receiver of claim 1 , wherein one of the first and second resonant frequencies is 6.78 MHz.

4. The wireless power receiver of claim 1 , wherein the plurality of inductive elements comprises a second inductive element, wherein the first inductive element surrounds the second inductive element.

5. The wireless power receiver of claim 1 , wherein the plurality of inductive elements are planar.

6. The wireless power receiver of claim 1 , further comprising:
a plurality of switching elements coupled to the network of passive components to convert from AC to DC.

7. The wireless power receiver of claim 1 , wherein the wireless power receiver is a multi-mode wireless power receiver configured to receive power wirelessly at the first resonant frequency or the second resonant frequency.

8. The wireless power receiver of claim 1 , wherein the wireless power receiver is configured to provide in-band communications based on load modulation.

9. The wireless power receiver of claim 1 , further comprising a rectification circuit.

10. The wireless power receiver of claim 9 , wherein the rectification circuit comprises a synchronous rectifier or a bridge rectifier.

Assignees

• Mediatek Singapore Pte Ltd

Inventors

• Riehl Patrick Stanley

Classifications

• H01F38/14 Primary

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H02J50/12

  of the resonant type · CPC title

• H02J17/00

  Electricity · mapped topic

• H02J5/005

  Electricity · mapped topic

• H02J7/025 Primary

  Electricity · mapped topic