WIRELESS POWER SOURCE WITH PARALLEL RESONANT PATHS

• US 20160172892A1
• Filed: 08/05/2014
• Published: 06/16/2016
• Est. Priority Date: 08/06/2013
• Status: Abandoned Application

• Current Assignee: MediaTek Singapore Pte. Ltd. (MediaTek, Inc.)
• Original Assignee: MediaTek Singapore Pte. Ltd. (MediaTek, Inc.)
• Inventors: AYACHIT, Agasthya, SATYAMOORTHY, Anand, RIEHL, Patrick Stanley
• Application Number:
  US14/907,063
• Publication Number:
  US 20160172892A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/50 using additional energy repeaters between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage

Abstract

A wireless charger for charging multiple devices is provided that includes one or more drive coils that are coupled to a drive amplifier. A plurality of repeater coils are coupled to the one or more drive coils. One or more receiver coils are coupled to the repeater coils. The one or more repeater coils are tuned such that they are only resonant when the one or more receiver coils are in close proximity.

Claims

1. A wireless charger for charging multiple devices comprising:

one or more drive coils that are coupled to a drive amplifier;

a plurality of repeater coils that are coupled to the one or more drive coils; and

one or more receiver coils that are coupled to said repeater coils, the one or more repeater coils being tuned such that they are only resonant when the one or more receiver coils are in close proximity.

2. The wireless charger of claim 1, wherein the drive amplifier is coupled to a plurality of drive coils in parallel, each of which is coupled to at least one repeater coil, each of the at least one repeater coil is coupled to the one or more receiver coils

3. The wireless charger of claim 2, wherein the coils are tuned such that the drive coil that is coupled to a receiver at a given time presents a lower impedance to the amplifier, thus drawing more current.

4. The wireless charger of claim 1, wherein the repeater coils are tuned so as to present a higher impedance to the drive amplifier when coupled to a receiver coil.

5. A method of forming a wireless charger for charging multiple devices comprising:

providing one or more drive coils that are coupled to a drive amplifier;

positioning a plurality of repeater coils that are coupled to the one or more drive coils; and

positioning one or more receiver coils that are coupled to said repeater coils, the one or more repeater coils being tuned such that they are only resonant when the one or more resonant coils are in close proximity.

6. The method of claim 5, wherein the drive amplifier is coupled to a plurality of drive coils in parallel, each of which is coupled to at least one repeater coil, each of the at least one repeater coil is coupled to the one or more receiver coils

7. The method of claim 6, wherein the coils are tuned such that the drive coil that is coupled to a receiver at a given time presents a lower impedance to the amplifier, thus drawing more current.

8. The method of claim 5, wherein the repeater coils are tuned so as to present a higher impedance to the drive amplifier when coupled to a receiver coil.