US 12,074,663 B2
Amplitude-shift keying demodulation for wireless chargers
Yannick Guedon, Singapore (SG)
Assigned to STMICROELECTRONICS ASIA PACIFIC PTE LTD., Singapore (SG)
Filed by STMicroelectronics Asia Pacific Pte Ltd., Singapore (SG)
Filed on Oct. 17, 2022, as Appl. No. 17/967,449.
Application 17/967,449 is a continuation of application No. 17/402,108, filed on Aug. 13, 2021, granted, now 11,509,513.
Application 17/402,108 is a continuation of application No. 16/669,068, filed on Oct. 30, 2019, granted, now 11,140,010, issued on Oct. 5, 2021.
Prior Publication US 2023/0035218 A1, Feb. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 5/72 (2024.01); H02J 7/04 (2006.01); H02J 50/12 (2016.01); H02J 50/80 (2016.01); H04B 5/79 (2024.01); H04L 25/49 (2006.01); H04L 27/06 (2006.01)
CPC H04B 5/72 (2024.01) [H02J 7/04 (2013.01); H02J 50/12 (2016.02); H02J 50/80 (2016.02); H04B 5/79 (2024.01); H04L 25/4904 (2013.01); H04L 27/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power transmitter comprising:
a first switch coupled between a first node and a reference voltage node;
a second switch coupled between the first node and a power supply node;
a coil, wherein a first end of the coil is coupled to the first node, and a second end of the coil is coupled to the reference voltage node;
a first sample-and-hold (S&H) circuit coupled to the first node;
a second S&H circuit coupled to the second end of the coil; and
a timing control circuit, wherein the timing control circuit is configured to generate a first control signal, a second control signal, and a third control signal, wherein the first control signal is configured to turn the first switch ON and OFF alternately at a switching frequency, the second control signal is configured to turn the second switch ON and OFF alternately at the switching frequency, and the third control signal is configured to enable the first S&H circuit to sample at the switching frequency.