US 12,218,590 B2
Soft start for Buck converter
Antonino Torres, Catania (IT)
Assigned to STMicroelectronics International N.V., Geneva (CH)
Filed by STMicroelectronics International N.V., Geneva (CH)
Filed on Dec. 15, 2022, as Appl. No. 18/066,765.
Prior Publication US 2024/0204663 A1, Jun. 20, 2024
Int. Cl. H02M 1/08 (2006.01); H02M 1/36 (2007.01); H02M 3/157 (2006.01); H02M 3/158 (2006.01)
CPC H02M 3/157 (2013.01) [H02M 1/08 (2013.01); H02M 1/36 (2013.01); H02M 3/158 (2013.01)] 20 Claims
OG exemplary drawing
 
18. A method of starting a Buck converter, the method comprising:
supplying a reference voltage to a control circuit for the Buck converter, wherein the reference voltage increases from a first voltage to a second voltage;
comparing an output voltage of the Buck converter with a pre-determined threshold;
in response to detecting that the output voltage of the Buck converter is lower than the pre-determined threshold, driving the Buck converter with a first control signal, wherein the first control signal comprises a first plurality of pulses having a time-varying pulse width that is proportional with the reference voltage; and
in response to detecting that the output voltage of the Buck converter is higher than the pre-determined threshold, driving the Buck converter with a second control signal, wherein the second control signal comprises a second plurality of pulses with a pulse width proportional to a ratio between the output voltage of the Buck converter and a supply voltage of the Buck converter.