US 9,812,965 B2
Low input voltage boost converter with peak inductor current control and offset compensated zero detection
Benton Calhoun, Charlottesville, VA (US); and Aatmesh Shrivastava, Charlottesville, VA (US)
Assigned to University of Virginia Patent Foundation, Charlottesville, VA (US)
Filed by University of Virginia Patent Foundation, Charlottesville, VA (US)
Filed on Dec. 17, 2016, as Appl. No. 15/382,639.
Application 15/382,639 is a division of application No. 15/268,783, filed on Sep. 19, 2016.
Application 15/268,783 is a division of application No. 15/085,428, filed on Mar. 30, 2016, granted, now 9,490,698.
Application 15/085,428 is a division of application No. 14/600,425, filed on Jan. 20, 2015, granted, now 9,325,240.
Claims priority of provisional application 61/928,621, filed on Jan. 17, 2014.
Prior Publication US 2017/0098999 A1, Apr. 6, 2017
Int. Cl. H02M 3/156 (2006.01); H02M 3/158 (2006.01); H02M 1/088 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 1/088 (2013.01); H02M 2001/0025 (2013.01)] 20 Claims
OG exemplary drawing
 
20. An apparatus, comprising:
an inductor configured to pass through an inductor current;
a boost converter switch operatively coupled to the inductor, configured to receive a control signal to activate a boost converter to generate the inductor current; and
a switch control circuit operatively coupled to the boost converter switch, the switch control circuit configured to:
receive an input voltage and generate a control signal having an amplitude proportional to the square of a magnitude of the input voltage and having a pulse duration proportional to an inverse of the magnitude of the input voltage, and
vary an activation time of the boost converter switch based on the input voltage to maintain a peak inductor current of the inductor substantially constant.