US 12,463,640 B2
Single-FET MUX switch for coil selection
Yong Liao, Aliso Viejo, CA (US)
Assigned to AyDeeKay LLC, Aliso Viejo, CA (US)
Filed by AyDeeKay LLC, Aliso Viejo, CA (US)
Filed on Apr. 1, 2022, as Appl. No. 17/712,028.
Claims priority of provisional application 63/275,452, filed on Nov. 4, 2021.
Prior Publication US 2023/0139164 A1, May 4, 2023
Int. Cl. H02J 50/40 (2016.01); H02J 50/12 (2016.01); H02J 50/80 (2016.01); H03K 17/567 (2006.01); H03K 17/687 (2006.01); H03K 17/693 (2006.01)
CPC H03K 17/693 (2013.01) [H02J 50/12 (2016.02); H02J 50/40 (2016.02); H02J 50/80 (2016.02); H03K 17/567 (2013.01); H03K 17/6871 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An integrated circuit, comprising a wireless-charger transmitter, wherein the wireless-charger transmitter comprises:
a driver circuit electrically coupled to multiple branches associated with multiple transmission coils, wherein a given branch comprises or is configured to electrically couple to: a capacitor, a multiplexer (MUX) switch that comprises a single field-effect transistor (FET) or a single integrated-gate bipolar transistor (IGBT), and a given transmission coil; and
a control circuit configured to provide control signals to gates of FETs or the IGBTs in the branches that selectively activate at least the MUX switch in the given branch and selectively deactivate remaining MUX switches in a remainder of the branches, wherein the driver circuit is configured to perform wireless charging by driving the given transmission coil in the activated given branch using an electrical signal having a fundamental frequency component, wherein the FET is configured in a nonconductive state to block current flow in the given branch for capacitor voltages having a first polarity, and the capacitor is configured to charge up and bias a body diode of the FET to block current flow in the given branch for capacitor voltages having a second polarity after a predefined number of cycles of the fundamental frequency.