US 12,438,439 B2
Common mode noise cancellation for LLC resonant converters
Chanwit Prasantanakorn, Santa Clara, CA (US); and Bharat K Patel, San Martin, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Jan. 31, 2023, as Appl. No. 18/162,196.
Prior Publication US 2024/0258905 A1, Aug. 1, 2024
Int. Cl. H02M 1/12 (2006.01); H02M 1/42 (2007.01); H02M 3/00 (2006.01); H02M 3/335 (2006.01); H02M 7/04 (2006.01)
CPC H02M 1/123 (2021.05) [H02M 1/4208 (2013.01); H02M 3/01 (2021.05); H02M 3/33571 (2021.05); H02M 7/04 (2013.01); H02M 1/4225 (2013.01); H02M 1/4241 (2013.01)] 31 Claims
OG exemplary drawing
 
1. A power converter comprising:
a switching bridge having two input terminals configured to receive an input voltage and a switch node coupled to a primary winding of a transformer;
at least one rectifier device coupled between a secondary winding of the transformer and an output of the power converter; and
a common mode noise compensation capacitor, a first terminal of the common mode noise compensation capacitor being coupled to a connection between the secondary winding of the transformer and the at least one rectifier device, and a second terminal of the common mode noise compensation capacitor being coupled to an energized input terminal of the two input terminals.