US 11,658,561 B2
LCL filter
Jez Radoslaw, Zory (PL); and Miskiewicz Milosz, Cracow (PL)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Nov. 6, 2020, as Appl. No. 17/91,358.
Claims priority of application No. 19207847 (EP), filed on Nov. 7, 2019.
Prior Publication US 2021/0143726 A1, May 13, 2021
Int. Cl. H02M 1/12 (2006.01); H01F 27/24 (2006.01); H01F 27/30 (2006.01)
CPC H02M 1/126 (2013.01) [H01F 27/24 (2013.01); H01F 27/306 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An LCL filter for 1 or 3-phase grid comprising:
one magnetic core;
at least one primary winding;
at least one secondary winding; and
at least one winding for reducing flux ripples in the magnetic core located between the primary winding and the secondary winding,
wherein:
said windings are placed on the magnetic core,
the primary winding is connected to the input of said LCL filter for connecting the filter to an inverter,
the secondary winding is connected to the output of said LCL filter for connecting the filter to a load or grid,
the winding is connected to the filter capacitor,
the magnetic core is a closed magnetic core, and
said windings are galvanically insulated.