US 9,812,955 B2
Method for limiting the starting current of a step-up-converter
Dirk Wüstenhagen, Auma (DE); and Dejan Kienzle, Heilbronn (DE)
Assigned to BorgWarner Ludwigsburg GmbH, Ludwigsburg (DE)
Filed by BorgWarner Ludwigsburg GmbH, Ludwigsburg (DE)
Filed on Sep. 14, 2016, as Appl. No. 15/265,423.
Claims priority of application No. 10 2015 115 637 (DE), filed on Sep. 16, 2015.
Prior Publication US 2017/0077804 A1, Mar. 16, 2017
Int. Cl. H02M 3/158 (2006.01); H02M 3/07 (2006.01); H02M 1/36 (2007.01)
CPC H02M 3/07 (2013.01) [H02M 1/36 (2013.01); H02M 3/158 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for limiting a starting current of a step-up-converter that is supplied by a DC voltage source, the step-up converter comprising a first capacitor, a coil connected in parallel to the first capacitor, a second capacitor connected to the coil in series, and a switch connected to the second capacitor in parallel and connected to the coil in series, said method comprising:
a) measuring an output voltage of the step-up converter and connecting the step-up-converter to the DC voltage source by closing a power switch that is connected in series to the first capacitor;
b) opening the power switch as soon as the output voltage increases by more than a predefined threshold value from the time the power switch was closed, and maintaining the power switch open for a predefined time; and
c) repeating steps a) and b) until the output voltage reaches a predefined final value.