Wireless power system with a self-regulating wireless power receiver

• US 9,608,454 B2
• Filed: 12/02/2013
• Issued: 03/28/2017
• Est. Priority Date: 12/03/2012
• Status: Active Grant

• Current Assignee: WiPQTUS Inc.
• Original Assignee: WiPQTUS Inc.
• Inventors: Sankar, Ganapathy
• Primary Examiner(s): Kim, Jung
• Assistant Examiner(s): Yeshaw, Esayas
• Application Number:
  US14/094,750
• Publication Number:
  US 20140152117A1
• Time in Patent Office: 1,212 Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
• CPC Class Codes: H03H 7/40 Automatic matching of load impedance to source impedance
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A method and a system for self-regulating wireless power transmitted to a wireless power receiver (WPR) are provided. An auto-tuning network is operably coupled within the WPR. The auto-tuning network includes an impedance network that dynamically increases, decreases, or maintains an amount of the received wirelessly transmitted power by detecting changes in a rectifier load disposed in the WPR and/or in a rectifier output voltage in the WPR. The auto-tuning network self-regulates the wireless power received from a wireless power transmitter (WPT) obviating the need for conventional communication messages. The WPT is hence free from a modulator/demodulator block and an out-of-band communication block and operates over a limited operating range to enable a simpler design for passing electromagnetic compliance regulations. The WPR implements a receiver-maximum-power-signature algorithm for enabling the WPT to detect unsupported receivers, configure its operating point and range, and terminate power transmission when not needed by the WPR.

Claims

1. A wireless power system comprising:

a wireless power transmitter configured to transmit wireless power; and

one or more self-regulating wireless power receivers configured to receive wirelessly transmitted power, said one or more wireless power receivers each comprising;

an auto-tuning network operably coupled within said wireless power receiver, said auto-tuning network configured to control and regulate said received wirelessly transmitted power, and

a rectifier operably coupled within said wireless power receiver, said rectifier configured to convert the said received wirelessly transmitted power from alternating current (AC) power into direct current (DC) power;

wherein said auto-tuning network in said wireless power receiver is configured to detect changed in one or both of a load of said rectifier and an output voltage of said rectifier, and to dynamically counteract said detected changed if the changed exceed a safe operating range, said auto-tuning network counteracts said unsafe changes by dynamically tuning its network.

2. The wireless power system of claim 1, wherein said auto-tuning network in said wireless power receiver comprises an impedance network, said impedance network dynamically configured to one of increase, decrease, and maintain amount of said received wirelessly transmitted power.

3. The wireless power system of claim 2, wherein said impedance network of said auto-tuning network in said wireless power receiver comprises one or more of passive electronic components, active electronic components, and electronic switches.

4. The wireless power system of claim 1, wherein said self-regulating wireless power receiver is configured to implement a receiver-maximum power-signature algorithm for enabling a wireless power transmitter to detect unsupported receivers and terminate transmission of power, wherein said receiver-maximum power-signature algorithm defines instructions for varying input impedance of said self-regulating wireless power receiver by a predefined amount for predetermined intervals of time, and wherein said input impedance of said self-regulating wireless power receiver is varied via impedance changes in said auto-tuning network of said self-regulating wireless power receiver.

5. The wireless power system of claim 4, wherein said wireless power transmitter is aware of the maximum power needs of said wireless power receiver via said receiver-maximum power-signature messages from said wireless power receiver, wherein said wireless power transmitter configures its operating point and range to transmit a required level of maximum wireless power to said wireless power receiver based on the received said maximum-power-signature message and an estimated level of magnetic field flux coupling between said wireless power transmitter and said wireless power receiver.

6. The wireless power system of claim 5, wherein said wireless power transmitter terminates said transmission of said wireless power to said wireless power receiver when said receiver-maximum power-signature messages are not periodically received.

7. The wireless power system of claim 1, wherein said wireless power transmitter does not contain one or both of a modulator/demodulator block and an out-of-band communication block configured to communicate conventional wireless power protocol messages to and from said self-regulating wireless power receiver, wherein said self-regulating wireless power receiver, via said auto-tuning network, is configured to regulate said wirelessly transmitted power from said wireless power transmitter without said communication of said conventional wireless power protocol messages to and from said modulator/demodulator block and said out-of-band communication block.

8. The wireless power system of claim 1, wherein said self-regulating wireless power receiver, via said auto-tuning network, is configured to receive said wirelessly transmitted power from a wireless power transmitter without establishing a conventional communication protocol with said wireless power transmitter.

9. A method for self regulating wireless power system, said method comprising:

providing a wireless power transmitter; and

providing one or more self-regulating wireless power receivers each comprising an auto-tuning network and a rectifier;

configuring said one or more self-regulating wireless power receivers to receive wirelessly transmitted power from said wireless power transmitter;

configuring said auto-tuning network in said wireless power receiver to control and regulate said received wirelessly transmitted power by detecting changes in one or both of a load of said rectifier and an output voltage of said rectifier, and dynamically counteracting said detected changes if the changes exceed a safe operating range by dynamically tuning its network.

10. The method of claim 9, wherein said auto-tuning network is comprising of an impedance network, wherein said impedance network is being dynamically configured to one of increase, decrease, and maintain amount of said received wirelessly transmitted power.

11. The method of claim 10, wherein said impedance network is comprising one or more of passive electronic components, active electronic components, and electronic switches.

12. The method of claim 9, further comprising implementing a receiver-maximum power-signature algorithm by said self-regulating wireless power receiver for enabling said wireless power transmitter to detect unsupported receivers and to configure its operating point to transmit a required level of maximum wireless power to said self-regulating wireless power receiver, wherein said receiver-maximum power-signature algorithm defines instructions for varying input impedance of said self-regulating wireless power receiver by a predefined amount for predetermined intervals of time, and wherein said input impedance of said self-regulating wireless power receiver is varied via impedance changes in said auto-tuning network of said self-regulating wireless power receiver.

13. The method of claim 9, wherein said self-regulating wireless power receiver, via said auto-tuning network, is configured to receive said wirelessly transmitted power from said wireless power transmitter that does not contain one or both of a modulator/demodulator block and an out-of-band communication block, that is used for communication of conventional wireless power protocol messages.

14. The method of claim 9, wherein said self-regulating wireless power receiver, via said auto-tuning network, is configured to receive said wirelessly transmitted power from said wireless power transmitter without establishing a conventional communication protocol with said wireless power transmitter, said conventional communication protocol comprising messages for increasing, decreasing, maintaining and stopping the wireless power transfer.

15. The method of claim 12, wherein said wireless power transmitter terminates said transmission of said wireless power to said wireless power receiver when said receiver-maximum power-signature messages are not periodically received.