US 11,943,851 B2
Narrow pulse widths in h-bridge buck-boost drivers
Suresh Hariharan, Livermore, CA (US); Ron Vincent Ocampo, San Jose, CA (US); and Ramesh Selvaraj, San Jose, CA (US)
Assigned to Maxim Integrated Products, Inc., San Jose, CA (US)
Filed by Maxim Integrated Products, Inc., San Jose, CA (US)
Filed on Aug. 4, 2022, as Appl. No. 17/881,491.
Claims priority of provisional application 63/229,641, filed on Aug. 5, 2021.
Prior Publication US 2023/0041463 A1, Feb. 9, 2023
Int. Cl. H05B 45/3725 (2020.01); H02M 1/32 (2007.01); H02M 3/158 (2006.01); H05B 45/10 (2020.01); H05B 45/325 (2020.01)
CPC H05B 45/3725 (2020.01) [H02M 1/32 (2013.01); H02M 3/1582 (2013.01); H05B 45/10 (2020.01); H05B 45/325 (2020.01)] 20 Claims
OG exemplary drawing
 
20. A buck-boost driver circuit comprising:
an H-bridge comprising:
a low-side switch that, in a shunting mode, carries a first average current;
a high-side switch that, in a non-shunting mode, carries a second average current; and
an average current mode control circuit that uses an error voltage from a first circuit loop that comprises the low-side switch and uses a load current from a second circuit loop that comprises the high-side switch to adjust the first and second average currents to be substantially the same to reduce a current pulse width of the load current, the low-side switch allowing an output capacitor of the buck-boost driver circuit to operate without a shunt switch; and
a set of comparators that uses the error voltage to determine a duty cycle of at least one or more switches of the H-bridge.