US 11,862,381 B2
Power transformer of the symmetric-asymmetric type with a fully-balanced topology
Vincent Knopik, Crets en Belledonne (FR)
Assigned to STMicroelectronics SA, Montrouge (FR)
Filed by STMicroelectronics SA, Montrouge (FR)
Filed on Dec. 27, 2022, as Appl. No. 18/146,572.
Application 18/146,572 is a division of application No. 16/275,091, filed on Feb. 13, 2019, granted, now 11,569,021.
Application 16/275,091 is a continuation of application No. 15/223,148, filed on Jul. 29, 2016, granted, now 10,249,427, issued on Apr. 2, 2019.
Claims priority of application No. 1652713 (FR), filed on Mar. 30, 2016.
Prior Publication US 2023/0134367 A1, May 4, 2023
Int. Cl. H01Q 1/36 (2006.01); H01F 27/28 (2006.01); H01L 23/522 (2006.01); H03H 7/42 (2006.01); H01F 27/29 (2006.01); H01F 38/14 (2006.01); H01F 41/04 (2006.01); H01F 41/10 (2006.01); H01Q 1/24 (2006.01); H01Q 1/48 (2006.01); H01Q 1/50 (2006.01); H01Q 7/00 (2006.01)
CPC H01F 27/2804 (2013.01) [H01F 27/29 (2013.01); H01F 38/14 (2013.01); H01F 41/041 (2013.01); H01F 41/10 (2013.01); H01L 23/5227 (2013.01); H01Q 1/243 (2013.01); H01Q 1/36 (2013.01); H01Q 1/48 (2013.01); H01Q 1/50 (2013.01); H01Q 7/00 (2013.01); H03H 7/42 (2013.01); H01F 2027/2809 (2013.01); H01F 2027/2819 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A balun transformer, comprising:
a primary inductive circuit having a first terminal and a second terminal located side-by-side and symmetrically to a first axis and on a first side of the balun transformer; and
a secondary inductive circuit having a third terminal, a fourth terminal, a fifth terminal, and at least two loops, the secondary inductive circuit located at a second side of the balun transformer opposite the first side,
wherein the primary inductive circuit and the secondary inductive circuit are disposed on a plane,
wherein the primary inductive circuit includes more loops than the secondary inductive circuit, and
wherein the third terminal and the fourth terminal are located symmetrically to the first axis, the first axis crossing the fifth terminal symmetrically.