US 12,294,299 B2
Soft start for buck converters
John Duward Sagona, Poplar Grove, IL (US); and Patrick B. Palanca, Rockford, IL (US)
Assigned to Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Apr. 11, 2022, as Appl. No. 17/717,776.
Prior Publication US 2023/0327550 A1, Oct. 12, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/36 (2007.01); H02M 3/157 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 1/36 (2013.01); H02M 3/157 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of DC-DC power conversion comprising:
converting a DC link voltage to a DC output voltage for a load that is lower than the DC link voltage using a buck converter;
outputting a first control signal based on the DC output voltage and a commanded output voltage using a voltage regulation logic component;
outputting a second control signal based on the DC output voltage using a soft start function logic component;
controlling the buck converter in a normal switching mode in response to the DC link voltage being below a predetermined high threshold, wherein controlling the buck converter in the normal switching mode comprises:
switching the first control signal from the voltage regulation logic component to a current control logic component using a switch logic component; and
controlling a switching frequency of the buck converter using the current control logic component responsive to the first control signal; and
controlling the buck converter in a soft start switching mode in response to the DC link voltage being at or above the predetermined high threshold, wherein controlling the buck converter in the soft start switching mode comprises:
switching the second control signal from the soft start function logic component to the current control logic component using the switch logic component; and
controlling the switching frequency of the buck converter using the current control logic component responsive to the second control signal.