US 11,892,484 B2
Psuedo digital ASK demodulator with integrated buck boost and USB-PD for wireless charging
Prasanna Venkateswaran Vijayakumar, Bangalore (IN); Arun Khamesra, Bangalore (IN); Jegannathan Ramanujam, Bangalore (IN); and Ravi Konduru, Bengaluru (IN)
Assigned to Cypress Semiconductor Corporation, San Jose, CA (US)
Filed by Cypress Semiconductor Corporation, San Jose, CA (US)
Filed on Feb. 11, 2022, as Appl. No. 17/669,706.
Prior Publication US 2023/0258694 A1, Aug. 17, 2023
Int. Cl. G01R 19/10 (2006.01); H02J 50/80 (2016.01); G01R 31/30 (2006.01); H04L 27/06 (2006.01); H02J 50/12 (2016.01)
CPC G01R 19/10 (2013.01) [G01R 31/3004 (2013.01); H02J 50/12 (2016.02); H02J 50/80 (2016.02); H04L 27/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for demodulating data by a wireless charging transmitting device, comprising:
sensing a voltage signal of a coil used to wirelessly transmit a power signal from the wireless charging transmitting device, wherein a load impedance of the coil is modulated by data transmitted by a wireless charging receiving device;
sensing a current signal of the coil used to transmit the power signal using an adjustable sample-hold interval, wherein the adjustable sample-hold interval controls a timing for sampling the current signal; and
selecting dynamically between the sensed voltage signal or the sensed current signal to demodulate the data transmitted by the wireless charging receiving device.