Granted Patent B2

US 12,749,984 · App. 18/893,472 · Granted Sep 29, 2026

Inventor: James Sigamani (Manila, PH)

Assignee: Astec International Limited

H02M3/33571H02M3/01

Abstract

Claims (64)

1 . A transformer for a multi-phase power supply circuit, the transformer comprising:

a core body comprising:

a first base portion having a plurality of core legs joined thereto; and

a second base portion having a plurality of core legs joined thereto;

a plurality of primary coil assemblies, wherein each primary coil assembly of the plurality of primary coil assemblies comprises:

a first primary winding having a respective core leg of the plurality of core legs of the first base portion extending therethrough and comprising a first node and a second node; and

a second primary winding having a respective core leg of the plurality of core legs of the second base portion extending therethrough and comprising a first node and a second node;

wherein the second nodes of the first primary windings are electrically coupled together; and

wherein the first nodes of the second primary windings are electrically coupled together.

2 . The transformer of claim 1 further comprising a plurality of secondary coil assemblies, wherein each secondary coil assembly of the plurality of secondary coil assemblies comprises:

a first secondary winding having a first node and a second node;

wherein a first portion of each first secondary winding has a respective core leg of the plurality of core legs of the first base portion extending therethrough.

3 . The transformer of claim 2 , wherein a second portion of each first secondary winding has a respective core leg of the plurality of core legs of the second base portion extending therethrough.

4 . The transformer of claim 2 , wherein each secondary coil assembly of the plurality of secondary coil assemblies further comprises:

a second secondary winding having a first node and a second node;

wherein each second secondary winding has a respective core leg of the plurality of core legs of the second base portion extending therethrough.

5 . The transformer of claim 4 , wherein the second nodes of the first secondary windings are electrically coupled together; and

wherein the first nodes of the second secondary windings are electrically coupled together.

6 . The transformer of claim 1 , wherein the core body further comprises a transformer return leg configured to conduct magnetic flux between the first and second base portions.

7 . The transformer of claim 6 , wherein magnetic fluxes from each of the plurality of primary coil assemblies partially cancel each other within the transformer return leg.

8 . A method of forming a transformer for a multi-phase power supply circuit, the method comprising:

winding, about each core leg of a first plurality of core legs of a core body, a respective first primary winding, each first primary winding comprising a first node and a second node;

winding, about each core leg of a second plurality of core legs of the core body, a respective second primary winding, each second primary winding comprising a first node and a second node;

electrically coupling the second nodes of the first primary winding together; and

electrically coupling the first nodes of the second primary winding together;

wherein the first plurality of core legs are joined to a first base portion of the core body; and

wherein the second plurality of core legs are joined to a second base portion of the core body.

9 . The method of claim 8 further comprising winding, about each core leg of the first plurality of core legs, a first portion of a respective first secondary winding, each first secondary winding comprising a first node and a second node.

10 . The method of claim 9 further comprising winding a second portion of each first secondary winding about a respective core leg of the second plurality of core legs.

11 . The method of claim 9 further comprising winding, about each core leg of the second plurality of core legs, a first portion of a respective second secondary winding, each second secondary winding comprising a first node and a second node.

12 . The method of claim 11 further comprising:

electrically coupling the second nodes of the first secondary windings together; and

electrically coupling the first nodes of the second secondary windings together.

13 . A three-phase power supply circuit comprising:

a plurality of LLC resonant voltage converters; and

a transformer assembly coupled with the plurality of LLC resonant voltage converters;

wherein the transformer assembly comprises:

a core body comprising:

a first base portion having a plurality of core legs joined thereto; and

a second base portion having a plurality of core legs joined thereto;

a plurality of first primary windings, each first primary winding comprising a first node and a second node;

a plurality of second primary windings, each second primary winding comprising a first node and a second node;

wherein the second nodes of the first primary windings are electrically coupled together;

wherein the first nodes of the second primary windings are electrically coupled together;

wherein a respective core leg of the plurality of core legs of the first base portion extends through a respective first primary winding; and

wherein a respective core leg of the plurality of core legs of the second base portion extends through a respective second primary winding.

14 . The three-phase power supply circuit of claim 13 , wherein each first node of the first primary windings is electrically coupled to a first output terminal of a respective LLC resonant voltage converter of the plurality of LLC resonant voltage converters; and

wherein each second node of the second primary windings is electrically coupled to a second output terminal of a respective LLC resonant voltage converter of the plurality of LLC resonant voltage converters.

15 . The three-phase power supply circuit of claim 13 , wherein the transformer assembly further comprises a plurality of secondary coil assemblies;

wherein each secondary coil assembly of the plurality of secondary coil assemblies comprises a first secondary winding having a first node and a second node; and

wherein a first portion of each first secondary winding has a respective core leg of the plurality of core legs of the first base portion extending therethrough.

16 . The three-phase power supply circuit of claim 15 , wherein a second portion of each first secondary winding has a respective core leg of the plurality of core legs of the second base portion extending therethrough.

17 . The three-phase power supply circuit of claim 16 further comprising a plurality of bridge rectifiers electrically coupled with the transformer assembly, each bridge rectifier assembly electrically coupled with a respective first secondary winding and comprising:

a first pair of diodes electrically coupled with the first node of the respective first secondary winding; and

a second pair of diodes electrically coupled with the second node of the respective first secondary winding.

18 . The three-phase power supply circuit of claim 16 , wherein the core body further comprises a transformer return leg absent of any primary or secondary winding wound thereabout.

19 . The three-phase power supply circuit of claim 15 , wherein each secondary coil assembly of the plurality of secondary coil assemblies further comprises:

a second secondary winding having a first node and a second node;

wherein each second secondary winding has a respective core leg of the plurality of core legs of the second base portion extending therethrough;

wherein the second nodes of the first secondary windings are electrically coupled together; and

wherein the first nodes of the second secondary windings are electrically coupled together.

20 . The three-phase power supply circuit of claim 19 further comprising a plurality of bridge rectifiers electrically coupled with the transformer assembly, each bridge rectifier assembly electrically comprising:

a first pair of diodes electrically coupled with the first node of a respective first secondary winding; and

a second pair of diodes electrically coupled with the second node of a respective second secondary winding.

Assignments (2)

Continuity (2)

References Cited (23)