	US 12,113,445 B2
	Method and apparatus for sensing the input voltage of a power converter
Anders Lind, San Juan Capistrano, CA (US)
Assigned to SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Scottsdale, AZ (US)
Filed by SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC, Scottsdale, AZ (US)
Filed on Sep. 21, 2023, as Appl. No. 18/371,332.
Application 18/371,332 is a division of application No. 17/524,136, filed on Nov. 11, 2021, granted, now 11,824,430.
Claims priority of provisional application 63/114,139, filed on Nov. 16, 2020.
Prior Publication US 2024/0250614 A1, Jul. 25, 2024
Int. Cl. H02M 1/42 (2007.01); H02M 1/00 (2006.01); H02M 1/08 (2006.01); H02M 1/32 (2007.01); H02M 3/158 (2006.01); H02M 7/219 (2006.01)

CPC H02M 3/1588 (2013.01) [H02M 1/0009 (2021.05); H02M 1/083 (2013.01); H02M 1/32 (2013.01); H02M 1/42 (2013.01); H02M 1/4225 (2013.01); H02M 7/219 (2013.01); H02M 1/4233 (2013.01)]

20 Claims

1. A method of detecting zero crossings in an AC input voltage at an input of a power converter, the method comprising:

measuring, at a first time, a first voltage at the input of the power converter;

if the first voltage is positive:

determining that the first time corresponds to a positive half-cycle of the AC input voltage; and

if the first voltage is equal to approximately zero:

a) determining that the first time corresponds to a negative half-cycle of the AC input voltage;

b) turning on a high-side switch of the power converter for a first time period; and

c) measuring, during the first time period, a second voltage at the input of the power converter;

if the second voltage is less than a first threshold, turning off the high-side switch and repeating b) and c) after a time delay; and

if the second voltage is less than a second threshold, maintaining the high-side switch in an ON state for a second time period.