US 12,249,864 B2
Uninterruptible power supply converter circuit
Lorenzo Giuntini, Locarno (CH)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Apr. 21, 2023, as Appl. No. 18/304,917.
Application 18/304,917 is a continuation of application No. PCT/EP2021/078877, filed on Oct. 19, 2021.
Claims priority of application No. 20203666 (EP), filed on Oct. 23, 2020.
Prior Publication US 2023/0268764 A1, Aug. 24, 2023
Int. Cl. H02J 9/06 (2006.01); H02M 1/14 (2006.01); H02M 3/158 (2006.01)
CPC H02J 9/06 (2013.01) [H02M 1/143 (2013.01); H02M 3/1584 (2013.01); H02J 2207/20 (2020.01)] 12 Claims
OG exemplary drawing
 
1. An uninterruptible power supply (UPS) converter circuit, comprising:
a controlled switching element;
a filter capacitor;
a diode; and
a split DC capacitor comprising a plus DC capacitor and a minus DC capacitor split at a DC-link mid-point;
wherein the controlled switching element, the filter capacitor, the plus DC capacitor and the minus DC capacitor are connected to each other at the DC-link mid-point on a respective first side;
wherein a second side of the filter capacitor at an AC point is coupled via an inductor element to a second side of the controlled switching element, the second side of the controlled switching element being coupled to the second side of the plus DC capacitor and the minus DC capacitor;
the diode connecting the first side of the inductor element at the DC-link mid-point with the second side of the plus DC capacitor; and
wherein the controlled switching element is configured to be controlled in non-nominal operation to discharge the filter capacitor such that a current from the AC point via the inductor element flows alternatingly through the diode to the second side of the plus DC capacitor and to the DC-link mid-point, respectively, thereby discharging the filter capacitor.