US 12,347,601 B2
Planar transformer, power conversion circuit, and adapter
Peng Yu, Dongguan (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Dec. 14, 2021, as Appl. No. 17/550,188.
Application 17/550,188 is a continuation of application No. PCT/CN2020/083477, filed on Apr. 7, 2020.
Claims priority of application No. 201910518152.3 (CN), filed on Jun. 14, 2019.
Prior Publication US 2022/0102057 A1, Mar. 31, 2022
Int. Cl. H01F 27/29 (2006.01); H01F 27/28 (2006.01); H01F 27/36 (2006.01); H01F 27/38 (2006.01); H02M 1/44 (2007.01); H02M 3/335 (2006.01); H05K 1/16 (2006.01)
CPC H01F 27/2804 (2013.01) [H01F 27/29 (2013.01); H01F 27/36 (2013.01); H01F 27/38 (2013.01); H02M 1/44 (2013.01); H02M 3/33576 (2013.01); H05K 1/165 (2013.01); H01F 2027/2809 (2013.01); H01F 2027/2819 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A planar transformer, comprising a magnetic core and a printed circuit board (PCB) winding board, wherein the PCB winding board comprises:
a primary winding, wherein a first terminal of the primary winding is connected to an electric potential quiescent point of a primary circuit of a power conversion circuit, and a first turn of coil of the primary winding is disposed at a start position of the first terminal of the primary winding;
a secondary winding, wherein a first terminal of the secondary winding is connected to an electric potential quiescent point of a secondary circuit of the power conversion circuit, and a first turn of coil of the secondary winding is disposed at a start position of the first terminal of the secondary winding;
a shielding winding, disposed between the primary winding and the secondary winding, and configured to shield electric field coupling between the primary winding and the secondary winding; and
a compensation winding, adjacent to the primary winding or adjacent to the secondary winding, wherein the compensation winding comprises N turns of coils, and N is a positive number greater than 1
wherein the compensation winding is adjacent to a first winding layer in a first winding: the first winding is the primary winding adjacent to the compensation winding or the secondary winding adjacent to the compensation winding; and an (Ns)th turn to an (Ns+B−1)th turn of coils of the first winding are disposed at the first winding laver, wherein N satisfies the following condition:
N=Nb×C, and Nb=2×Ns+B−2, wherein
an induced voltage generated by Nb turns of coils is equal to an induced voltage generated by the first winding, C is a real number greater than 0, and Nb, Ns, and B are positive numbers.