US 11,888,400 B2
USB interface
Jean Camiolo, St Egrêve (FR); Francesco Ferrazza, Milan (IT); and Nathalie Ballot, Sassenage (FR)
Assigned to STMICROELECTRONICS (GRENOBLE 2) SAS, Grenoble (FR); and STMICROELECTRONICS S.R.L., Agrate Brianza (IT)
Filed by STMicroelectronics (Grenoble 2) SAS, Grenoble (FR); and STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed on Jul. 13, 2021, as Appl. No. 17/373,881.
Claims priority of application No. 2008346 (FR), filed on Aug. 7, 2020.
Prior Publication US 2022/0045615 A1, Feb. 10, 2022
Int. Cl. H02M 3/335 (2006.01); G06F 13/42 (2006.01)
CPC H02M 3/33523 (2013.01) [G06F 13/4282 (2013.01); G06F 2213/0042 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An USB interface comprising:
a transformer;
a primary winding of the transformer and a first switch connected in series between a first node and a second node;
a secondary winding of the transformer and a component connected in series between a third node and a fourth node, the fourth node configured to be set to a first reference potential;
a second switch connected between the third node and a first terminal, the first terminal configured to provide an output voltage of the USB interface;
wherein the component is configured to avoid a current circulation in the secondary winding when the first switch is closed; and
a control circuit configured to:
compare a first voltage of an interconnection node between the secondary winding and the component to a first threshold; and
compare the first voltage to a second threshold when the first voltage is, in absolute values, above the first threshold.