×

Bidirectional communication demodulation for wireless charging system

  • US 9,960,643 B2
  • Filed: 11/16/2015
  • Issued: 05/01/2018
  • Est. Priority Date: 05/11/2015
  • Status: Active Grant
First Claim
Patent Images

1. In a wireless charging system comprising a power transmitter and a power receiver, wherein a primary coil in the power transmitter wirelessly transmits a power signal to a secondary coil in the power receiver, a method implemented by one of the power transmitter and the power receiver for recovering binary data modulated on the power signal using a bi-phase digital encoding scheme, the method comprising:

  • (a) scaling an analog signal corresponding to voltage in a first coil of the wireless charging system using analog circuitry to generate a processed analog signal as a scaled-down waveform, wherein the first coil is one of the primary coil and the secondary coil;

    (b) periodically sampling the processed analog signal at expected times of occurrences of voltage peaks in the scaled-down waveform using an analog-to-digital converter triggered by a pulse-width modulator to generate a sequence of digital samples;

    (c) detecting transitions in the sequence of digital samples associated with the bi-phase digital encoding scheme by applying two or more different transition-detection filters to the sequence of digital samples; and

    (d) decoding the detected transitions to recover the binary data.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×