Transmitter to receiver communication link in a wireless power system

• US 9,654,184 B2
• Filed: 07/16/2013
• Issued: 05/16/2017
• Est. Priority Date: 07/20/2012
• Status: Expired due to Fees

• Current Assignee: WiPQTUS Inc.
• Original Assignee: WiPQTUS Inc.
• Inventors: Singh, Manjit, Sankar, Ganapathy
• Primary Examiner(s): Lu, Zhiyu
• Application Number:
  US13/942,712
• Publication Number:
  US 20140162554A1
• Time in Patent Office: 1,400 Days
• Field of Search: None
• 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 5/26 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 input impedance of said wireless power transmitter so as to modulate a current and a magnetic field produced on transmitter coil of said wireless power transmitter when a primary voltage is applied to said wireless power transmitter, said change to said input impedance initiated by said flux modulator in said wireless power transmitter while said wireless power transmitter is providing system, said change to said input impedance achieved by one or multiple of;

said transmitter coil comprising a primary could and a connection modulation coil, said flax modulator selecting one of said primary coil and combination of said primary coil and said communication modulation coil to cause said change in said input impedance;

said wireless power transmitter comprising a tuning circuit, said tuning circuit comprising a primary capacitor and a communication modulation capacitor, said flux modulator selecting one of said primary capacitor and a combination of said primary capacitor and said communication modulation capacitor to cause said change in said input impedance; and

said wireless power transmitter comprising said tuning circuit, said tuning circuit comprising a primary capacitor and a communication modulation resistor, said flux modulator selecting one of said primary capacitor and a combination of said primary capacitor and said communication modulation resistor to cause said change in said input impedance;

and

a flux demodulator operably disposed in said 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 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.

3. 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.

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

operably disposing a flu 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 the effective input impedance of said wireless power transmitter to modulate a current and a magnetic field produced on transmitter coil of said wireless power transmitter when a primary voltage is applied to said wireless power transmitter, said change to said input impedance initiated by said flux modulator while said wireless power transmitter is providing wireless power to said wireless power receiver of said wireless power system, said change to said input impedance achieved by one or multiple of;

said transmitter coil comprising a primary coil and a communication modulation coil, said flux modulator selecting one of said primary coil and a combination of said primary coil said communication modulation coil to cause said change in said input impedance; and

said wireless power transmitter comprising a tuning circuit, said tuning circuit comprising a primary capacitor and a communication modulation capacitor, said flux modulator selecting one of said primary capacitor and a combination of said primary capacitor and said communication modulation capacitor to cause said change in said input impedance; and

said wireless power transmitter comprising said tuning circuit, said tuning circuit comprising a primary capacitor and a communication modulation resistor, said flux modulator selecting one of said primary capacitor and a combination of said primary capacitor and said communication modulation resistor to cause said change in said input impedance,

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 induce secondary voltage is received and demodulated by said flux demodulator in said wireless power receiver for obtaining information from said wireless power transmitter.

5. The method of claim 4, 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.