Wireless power system with a self-regulating wireless power receiver

• US 10,044,228 B2
• Filed: 10/19/2016
• Issued: 08/07/2018
• Est. Priority Date: 12/03/2012
• Status: Active Grant

• Current Assignee: WiPQTUS Inc.
• Original Assignee: WiPQTUS Inc.
• Inventors: Sankar, Ganapathy
• Primary Examiner(s): Chang, Joseph
• Application Number:
  US15/298,100
• Publication Number:
  US 20170040846A1
• Time in Patent Office: 657 Days
• Field of Search: 307104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• 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: 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 system for self-regulating wireless power transmitted to a wireless power receiver (WPR) is provided. An auto-tuning network is operably coupled within the WPR. The auto-tuning network comprises an impedance network that dynamically increases, decreases, or maintains amount of the received wirelessly transmitted power by detecting changes in a rectifier load disposed in the WPR and/or in an output voltage of the rectifier 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 can operate over a limited operating range to enable simpler design for passing EMC regulation. Additionally, 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 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 including;

a dynamically reconfigurable rectifier operably coupled within said wireless power receiver, said rectifier comprised of an intelligent switch network via which said rectifier converts said received wirelessly transmitted power from alternating current (AC) power into direct current (DC) power;

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

2. The wireless power system of claim 1, wherein said reconfigurable rectifier in said wireless power receiver comprises one or more of passive electronic components, active electronic components and electronic switches.

3. The wireless power system of claim 1, wherein power is delivered to said load from said reconfigurable rectifier via intermediate power regulation circuitry.

4. 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 including a dynamically reconfigurable rectifier;

configuring said one or more self-regulating wireless power receivers to receive wirelessly transmitted power from said wireless power transmitter and deliver a steady DC power to their respective load;

configuring said reconfigurable rectifier in said wireless power receiver to control and regulate said received wirelessly transmitter power and delivered power to its load 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 reconfiguring the rectifier'"'"'s mode of operation.

5. The method of claim 4, wherein said reconfigurable rectifier in said wireless power receiver comprises one or more of passive electronic components, active electronic components and electronic switches.