US 11,689,102 B2
Boost converter circuit with feedforward path for improved load regulation
Subbarao Surendra Chakkirala, San Jose, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Jan. 11, 2021, as Appl. No. 17/145,831.
Prior Publication US 2022/0224230 A1, Jul. 14, 2022
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2006.01); H02M 3/157 (2006.01); H04R 3/00 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 1/00 (2013.01); H02M 3/157 (2013.01); H02M 1/0016 (2021.05); H04R 3/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power supply circuit comprising:
a boost converter comprising:
an inductive element coupled between an input voltage node and a switching node;
a first switch coupled between the switching node and a reference potential node; and
a second switch or a diode coupled between the switching node and an output voltage node; and
a feedback control circuit having a first input coupled to the output voltage node, having a second input configured to sense a current through the first switch, and having an output coupled to at least a control input of the first switch, the feedback control circuit comprising:
a voltage node configured to influence a duty cycle of the boost converter;
a feedforward path coupled to the voltage node and configured to have a voltage signal derived from an input voltage at the input voltage node;
a combiner having an output coupled to the voltage node and having a first input coupled to the feedforward path, such that the feedforward path is coupled to the voltage node via the combiner; and
a first comparator having a first input coupled to the second input of the feedback control circuit and having a second input coupled to the output of the combiner.