US 12,292,461 B2
Resonant frequency change detection
Florian Thomas Müller, Buch am Erlbach (DE)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Feb. 28, 2022, as Appl. No. 17/682,506.
Prior Publication US 2023/0273249 A1, Aug. 31, 2023
Int. Cl. G01R 22/06 (2006.01); H02M 1/36 (2007.01); H02M 3/335 (2006.01)
CPC G01R 22/066 (2013.01) [H02M 1/36 (2013.01); H02M 3/335 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A system, comprising:
a flyback converter having a resonant frequency and a discontinuous conduction mode, the flyback converter including a controller configured to:
determine a first resonant frequency during the discontinuous conduction mode after a startup and demagnetization period of the flyback converter;
determine a second resonant frequency during the discontinuous conduction mode at a second time;
determine a threshold based on the first resonant frequency;
determine whether the second resonant frequency exceeds the threshold; and
responsive to determining that the resonant frequency exceeds the threshold, trigger an event.