Transmitter To Receiver Communication Link In A Wireless Power System

• US 20140162554A1
• Filed: 07/16/2013
• Published: 06/12/2014
• Est. Priority Date: 07/20/2012
• Status: Active Grant

• Current Assignee: WiPQTUS Inc.
• Original Assignee: WiPQTUS Inc.
• Inventors: Sankar, Ganapathy, Singh, Manjit
• Granted Patent: US 9,654,184 B2
• Time in Patent Office: Days
• US Class Current: 455/41.2
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H04B 5/0031 for data transfer
• CPC Class Codes: H04B 5/0037 for power transfer
• CPC Class Codes: H04B 5/0081 with antenna coils loop aerials H01Q7/00
• 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 establishing a communication link in a wireless power system from a wireless power transmitter (WPT) to a wireless power receiver (WPR) is provided. A flux modulator is operably disposed in the WPT for dynamically changing the WPT'"'"'s impedance so as to modulate a magnetic field produced on the transmitter coil when a primary voltage applied to the WPT. A flux demodulator is operably disposed in the WPR for receiving and demodulating a secondary voltage induced on a receiver coil due to the modulated magnetic field on the transmitter coil. The induction of the secondary voltage on the receiver coil due to the modulated magnetic field on the transmitter coil establishes the communication link from the WPT to the WPR. The flux demodulator is configured as an analog signal processing chain or a digital signal processing block for decoding information obtained from the WPT.

Claims

1. A system for establishing a communication link in a wireless power system, comprising:

a flux modulator operably disposed in a wireless power transmitter of said wireless power system, said flux modulator configured to dynamically change effective impedance of said wireless power transmitter so as to modulate a magnetic field produced on said transmitter coil when a primary voltage is applied to said wireless power transmitter; and

a flux demodulator operably disposed in a wireless power receiver of said wireless power system, said flux demodulator configured to receive and demodulate a secondary voltage induced on a receiver coil due to said modulated magnetic field on said transmitter coil for obtaining information from said wireless power transmitter;

whereby said induction of said secondary voltage on said receiver coil due to said modulated magnetic field on said transmitter coil establishes said communication link between said transmitter and said receiver in said wireless power system.

2. The system of claim 1, wherein said transmitter coil comprises a primary coil and a communication modulation coil, and wherein said flux modulator changes said effective impedance of said wireless power transmitter by selecting one of said primary coil and a combination of said primary coil and said communication modulation coil.

3. The system of claim 1, wherein said flux demodulator is configured as an analog signal processing chain comprising a peak detector, a filter gain block, and a comparator for decoding said information obtained from said transmitter via said established communication link.

4. The system of claim 1, wherein said flux demodulator is configured as a digital signal processing block for decoding said information obtained from said transmitter via said established communication link.

5. The system of claim 1, wherein a tuning circuit comprises a primary capacitor and a communication modulation capacitor, and wherein said flux modulator dynamically changes said effective impedance of said wireless power transmitter by selecting one of said primary capacitor and a combination of said primary capacitor and said communication modulation capacitor.

6. The system of claim 1, wherein a tuning circuit comprises a primary capacitor and a communication modulation resistor, and wherein said flux modulator dynamically changes said effective impedance of said wireless power transmitter by selecting one of said primary capacitor and a combination of said primary capacitor and said communication modulation resistor.

7. The system of claim 1, wherein a communication modulation resistor is included between an input power source and an inverter, wherein said flux modulator dynamically changes said effective impedance of said wireless power transmitter by including or excluding said communication modulation resistor between said input power source and said inverter.

8. A method for establishing a communication link in a wireless power system, comprising:

operably disposing a flux modulator in a wireless power transmitter of said wireless power system and a flux demodulator in a wireless power receiver of said wireless power system;

configuring said flux modulator to dynamically change effective impedance of said wireless power transmitter to modulate a magnetic field produced on said transmitter coil when a primary voltage is applied to said wireless power transmitter; and

inducing a secondary voltage on a receiver coil by said modulated magnetic field on said transmitter coil for establishing said communication link between said wireless power transmitter and said wireless power receiver, wherein said induced secondary voltage is received and demodulated by said flux demodulator for obtaining information from said wireless power transmitter.

9. The method of claim 8, wherein said transmitter coil comprises a primary coil and a communication modulation coil, and wherein said flux modulator selects one of said primary coil and a combination of said primary coil and said communication modulation coil for dynamically changing said effective impedance of said wireless power transmitter to modulate said magnetic field.

10. The method of claim 8, wherein said flux demodulator is configured as one of an analog signal processing chain and a digital signal processing block for decoding said information obtained from said wireless power transmitter via said established communication link.

11. The method of claim 8, wherein a tuning circuit comprises a primary capacitor and a communication modulation capacitor, and wherein said flux modulator dynamically changes said effective impedance of said wireless power transmitter by selecting one of said primary capacitor and a combination of said primary capacitor and said communication modulation capacitor.

12. The method of claim 8, wherein a tuning circuit comprises a primary capacitor and a communication modulation resistor, and wherein said flux modulator dynamically changes said effective impedance of said wireless power transmitter by selecting one of said primary capacitor and a combination of said primary capacitor and said communication modulation resistor.

13. The method of claim 8, wherein a communication modulation resistor is included between an input power source and an inverter, wherein said flux modulator dynamically changes said effective impedance of said wireless power transmitter by including or excluding said communication modulation resistor between said input power source and said inverter.