US 12,483,129 B2
Control of two-stage dc-dc converter
Nameer Ahmed Khan, Toronto (CA); Olivier Trescases, Toronto (CA); John Pigott, Phoenix, AZ (US); Hendrik Johannes Bergveld, Eindhoven (NL); Gerard Villar Piqué, Eindhoven (NL); and Alaa Eldin Y El Sherif, Plano, TX (US)
Assigned to NXP USA, Inc., Austin, TX (US)
Filed by NXP USA, Inc., Austin, TX (US)
Filed on Mar. 31, 2023, as Appl. No. 18/129,312.
Claims priority of application No. 22165872 (EP), filed on Mar. 31, 2022.
Prior Publication US 2023/0318453 A1, Oct. 5, 2023
Int. Cl. H02M 3/157 (2006.01); H02M 1/00 (2006.01); H02M 3/158 (2006.01)
CPC H02M 3/157 (2013.01) [H02M 1/0012 (2021.05); H02M 1/008 (2021.05); H02M 3/1582 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A controller for a power converter having a main converter connected between a first input voltage (VIN) and a ground and having a main output at a main output terminal, an auxiliary converter connected between a second input voltage (“VIN”) and the ground and having an auxiliary output (AUX), an output capacitor (COUT) connected between the main output terminal and the ground, and an auxiliary capacitor (CAUX) connected between the auxiliary output and the main output terminal;
the controller comprising:
a first control circuit configured to operate the main converter at a first frequency,
a second control circuit configured to operate the auxiliary converter at a second frequency;
the first control circuit being further configured to operate the main converter to control the voltage at the auxiliary output; and
the second control circuit being further configured to operate the auxiliary converter to control the voltage at the main output terminal;
wherein the main converter is configured to dynamically configure a slew rate of an auxiliary inductor current of the inductor based on a load current at the main output terminal.