IP Library › Granted Patent US 12,712,114
Granted Patent B2
US 12,712,114 · App. 18/806,859 · Granted Aug 18, 2026

Method of making a laminated transformer

Inventors: Ke Dai (Hangzhou, CN); Jian Wei (Hangzhou, CN); Jiajia Yan (Hangzhou, CN)
Assignee: Silergy Semiconductor Technology (Hangzhou) LTD.
H01F27/2804H01F27/24H01F27/323H01F2027/2809
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Quick Facts
Patent No.
US 12,712,114
App. No.
18/806,859
Granted
Aug 18, 2026
Kind
B2
Abstract

A method of making a laminated transformer can include: casting a non-magnetic material on a film to form a non-magnetic layer; performing a screen-printing process on the non-magnetic layer to form a winding layer, including a magnetic material body and a coil; and performing a pressing process to laminate two magnetic layers and a plurality of structures including the non-magnetic layer and the winding layer, where the plurality of structures are laminated between two layers of the magnetic layers.

Claims (16)

1 . A method of manufacturing a laminated transformer, the method comprising the steps of:

casting a non-magnetic material on a film to form a plurality of non-magnetic layers;

a screen-printing a plurality of winding layers on each non-magnetic layer of the plurality of non-magnetic layers, wherein each winding layer of the plurality of winding layers comprises a magnetic material body and a coil;

laminating by pressing two magnetic layers and a plurality of structures to form the laminated transformer, wherein each structure of a plurality of structures comprises a non-magnetic layer and a winding layer, wherein the plurality of structures are configured to position between two layers of the magnetic layers; and

screen-printing a magnetic paste on each non-magnetic layer of the plurality of non-magnetic layers to form the magnetic material body, forming a first opening in the magnetic material body, filling a metal paste in the first opening to form the coil, and removing the film to form each structure of the plurality of structures.

2 . The method of claim 1 , wherein prior to the screen-printing to form the magnetic material body, further comprising:

forming a second opening in at least portion of the non-magnetic layer; and

filling a metal material in the second opening to form a conductive pillar as an interlayer connection.

3 . The method of claim 2 , wherein the non-magnetic layer comprises the conductive pillar.

4 . The method of claim 1 , wherein:

a plurality of coil layers comprises a primary coil having at least one first type of coil layer, and a secondary coil having at least one second type of coil layer; and

further comprising disposing a first of the plurality of non-magnetic layers between the primary coil and the secondary coil.

5 . The method of claim 4 , further comprising disposing a second of the plurality of non-magnetic layers is disposed between two adjacent layers of the first type of coil layers.

6 . The method of claim 4 , further comprising disposing a second of the plurality of non-magnetic layers between two adjacent layers of the second type of coil layers.

7 . The method of claim 1 , wherein a lower a thickness of the non-magnetic layer, transmitting a less magnetic flux along a horizontal direction of the non-magnetic layer.

8 . The method of claim 1 , wherein a thickness of each magnetic layer is greater than a thickness of the winding layer.