US 12,218,595 B2
Double-boost DC/DC converter
Lorenzo Giuntini, Locarno (CH)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on May 5, 2022, as Appl. No. 17/737,158.
Claims priority of application No. 21172502 (EP), filed on May 6, 2021.
Prior Publication US 2022/0360176 A1, Nov. 10, 2022
Int. Cl. H02M 3/158 (2006.01); H02M 1/088 (2006.01)
CPC H02M 3/1582 (2013.01) [H02M 1/088 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A voltage balancing circuit for a double-boost DC/DC converter, comprising:
a split DC-link having a first midpoint;
outer switches and inner switches parallel-connected to the split DC-link, wherein the outer switches are connected to capacitors of the split DC-link and to the inner switches, the inner switches are connected to each other at a second midpoint, the inner switches comprise a first inner switch and a second inner switch, and the outer switches comprise a first outer switch and a second outer switch;
a DC source terminal to which a DC source is connectable in parallel to the inner switches over inductances;
wherein an inductance is connected to the first midpoint of the split DC link and to the second midpoint of the inner switches; and
a controller configured to perform the following steps:
in a first operation mode, where current is exchanged with the DC source:
S1: the first and second inner switch are switched on;
S2: after a first time interval, the second inner switch is switched off;
S3: after a second time interval, the first inner switch is switched off;
S4: after a third time interval, jump to S1; or
in a second operation mode, where no current is exchanged with the DC source alternatingly:
switching on the first outer switch and the first inner switch contemporarily and switching off the second outer switch and the second inner switch contemporarily,
switching off the first outer switch and the first inner switch contemporarily and switching on the second outer switch and the second inner switch contemporarily.