US 12,438,437 B2
Dynamic control of AC-DC power converter PFC front end during load transients
Vijay G Phadke, San Jose, CA (US); and Liang Zhou, Sunnyvale, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on May 22, 2023, as Appl. No. 18/321,287.
Prior Publication US 2024/0396473 A1, Nov. 28, 2024
Int. Cl. H02M 1/42 (2007.01); H02M 1/00 (2006.01); H02M 1/44 (2007.01); H02M 1/14 (2006.01); H02M 7/5387 (2007.01)
CPC H02M 1/007 (2021.05) [H02M 1/0025 (2021.05); H02M 1/4225 (2013.01); H02M 1/44 (2013.01); H02M 1/0009 (2021.05); H02M 1/143 (2013.01); H02M 7/53873 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An AC-DC power supply comprising:
a power factor correction (PFC) stage that receives a rectified AC input voltage and produces an intermediate DC bus voltage;
a DC-DC stage that receives the intermediate DC bus voltage and produces a regulated DC output voltage; and
a digital controller including:
a relatively faster DC-DC stage controller that receives one or more DC-DC stage feedback signals and produces in response thereto one or more DC-DC drive signals for one or more switching devices of the DC-DC stage;
a relatively slower PFC stage controller that receives one or more PFC feedback signals and produces in response thereto one or more PFC drive signals for one or more switching devices of the PFC stage; and
control logic that receives periodic output power indications of the AC-DC power supply and uses the periodic output power indications of the AC-DC power supply to cause the one or more PFC drive signals to respond to a change in output power of the AC-DC power supply more quickly than would be achieved by the relatively slower PFC stage controller.