US 11,949,334 B2
Power converter with DCR sensing circuit having improved noise immunity
Jonathan F. Bolus, San Francisco, CA (US); Alberto Alessandro Angelo Puggelli, Cupertino, CA (US); Fabio Gozzini, San Jose, CA (US); and Hao Zhou, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Dec. 15, 2021, as Appl. No. 17/644,521.
Prior Publication US 2023/0188035 A1, Jun. 15, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 1/0009 (2021.05); H02M 3/1584 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a coupled inductor power converter comprising:
a first switching circuit configured to source current to a first switch node that is coupled, via a first inductor, to a regulated power supply node;
a second switching circuit configured to source current to a second switch node that is coupled, via a second inductor, to the regulated power supply node, wherein the first and second inductors share a magnetic core;
a first filter circuit configured to filter a voltage level of a first terminal of the first inductor to generate a first filtered signal;
a second filter circuit configured to filter a voltage level of a second terminal of the first inductor to generate a second filtered signal;
a third filter circuit configured to filter a voltage level of a first terminal of the second inductor to generate a third filtered signal;
a fourth filter circuit configured to filter a voltage level of a second terminal of the second inductor to generate a fourth filtered signal;
a first capacitor coupled between the first and third filter circuits;
a second capacitor coupled between the second and fourth filter circuits; and
a control circuit configured to adjust operation of the first and second switching circuits using a voltage level of the regulated power supply node, and the first, second, third, and fourth filtered signals.