Dual-mode wireless power receiver

• US 9,859,744 B2
• Filed: 02/17/2014
• Issued: 01/02/2018
• Est. Priority Date: 08/03/2012
• Status: Active Grant

• Current Assignee: MediaTek Singapore Pte. Ltd. (MediaTek, Inc.)
• Original Assignee: MediaTek Singapore Pte. Ltd. (MediaTek, Inc.)
• Inventors: Riehl, Patrick Stanley
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): Shiao, David
• Application Number:
  US14/181,731
• Publication Number:
  US 20140159656A1
• Time in Patent Office: 1,415 Days
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas

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.

Claims

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.