Magnetic unit

Patent metadata

Field	Value
Publication number	US-11437175-B2
Application number	US-201916707041-A
Country	US
Kind code	B2
Filing date	Dec 9, 2019
Priority date	Dec 29, 2018
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

The present disclosure relates to the field of power electronic technology, provides a magnetic unit, including: a magnetic core and a winding, the magnetic core includes Q magnetic legs arranged in a row, where Q is a natural number and Q≥2, and the winding includes a first winding and a second winding, where the first winding is magnetically coupled with the second winding, and the first winding is wound around the Q magnetic legs while the second winding is wound around the Q magnetic legs. The first winding between any two adjacent magnetic legs is generally symmetrically disposed at both sides of the symmetric plane between the any two adjacent magnetic legs, thereby the magnetomotive force (MMF) distribution between any two adjacent magnetic legs is uniform.

First claim

What is claimed is:

1. A magnetic unit, comprising:
a magnetic core, comprising: Q magnetic legs arranged in a row, wherein Q is a natural number and Q≥2;
a first winding wound around the Q magnetic legs; and
a second winding magnetically coupled with the first winding and wound around the Q magnetic legs;
wherein the first winding comprises a first winding section formed on a first layer and a second winding section formed on a second layer;
wherein a virtual straight line exists between an i th magnetic leg and an (i+1) th magnetic leg adjacent to the i th magnetic leg among the Q magnetic legs, the virtual straight line intersects with a projection of the first winding section to form first cross line segments, and the number of the first cross line segments is (2n+1), and the virtual straight line intersects with a projection of the second winding section to form second cross line segments, and the number of the second cross line segments is (2n+1), wherein 1≤i≤Q−1 and n≥1;
wherein the i th magnetic leg and the (j+1) th magnetic leg have a symmetric plane, and a (n+1) th cross line segment among the (2n+1) first cross line segments intersects with the symmetric plane; and a (n+1) th cross line segment among the (2n+1) second cross line segments intersects with the symmetric plane.

2. The magnetic unit according to claim 1 , wherein an innermost turn of the first winding section wound around the i th magnetic leg and an innermost turn of the second winding section wound around the i th magnetic leg are connected in series, and an innermost turn of the first winding section wound around the (i+1) th magnetic leg and an innermost turn of the second winding section wound around the (i+1) th magnetic leg are connected in series.

3. The magnetic unit according to claim 1 , wherein
a proportional value A between lengths of the (n+1) th cross line segment among the (2n+1) first cross line segments at two sides of the symmetric plane is 0.7˜1.43; and
a proportional value B between lengths of the (n+1) th cross line segment among the (2n+1) second cross line segments at two sides of the symmetric plane is 0.7˜1.43.

4. The magnetic unit according to claim 1 , wherein each of the (2n+1) first cross line segments has the same length.

5. The magnetic unit according to claim 1 , wherein
among the (2n+1) first cross line segments, a length of the (n+1) th cross line segment is greater than or equal to a length of any of other 2n cross line segments, and a length of at least one cross line segment of said other 2n cross line segments is less than the length of the (n+1) th cross line segment; and
among the (2n+1) second cross line segments, a length of the (n+1) th cross line segment is greater than or equal to a length of any of other 2n cross line segments, and a length of at least one cross line segment of said other 2n cross line segments is less than the length of the (n+1) th cross line segment.

6. The magnetic unit according to claim 1 , wherein lengths of the (2n+1) first cross line segments gradually increase from the first line segment to the (n+1) th line segment, and gradually decrease from the (n+1) th line segment to the (2n+1) th line segment; and
lengths of the (2n+1) second cross line segments gradually increase from the first line segment to the (n+1) th line segment, and gradually decrease from the (n+1) th line segment to the (2n+1) th line segment.

7. The magnetic unit according to claim 1 , wherein the first winding or the second winding is formed by a PCB, a copper foil, a pie winding or any combination thereof.

8. The magnetic unit according to claim 1 , wherein the first winding and the second winding are used as a primary winding and a secondary winding of the transformer, respectively.

9. The magnetic unit according to claim 1 , further comprising a plurality of the first windings wound around the Q magnetic legs.

10. A magnetic unit, comprising:
a magnetic core, comprising a magnetic matrix having magnetic legs arranged with P rows and Q columns, where P and Q are natural numbers and P≥2, Q≥2;
a first winding wound around the P*Q magnetic legs; and
a second winding magnetically coupled with the first winding and wound around the P*Q magnetic legs;
wherein the first winding comprises a first winding section formed on a first layer and a second winding section formed on a second layer;
wherein a first virtual straight line exists between an i th magnetic leg and an (i+1) th magnetic leg adjacent to the i th magnetic leg among the Q magnetic legs in each row, the first virtual straight line intersects with a projection of the first winding section to form first cross line segments, and the number of the first cross line segments is (2+1), and the first virtual straight line intersects with a projection of the second winding section to form second cross line segments, and the number of the second cross line segments is (2n+1),
wherein a second virtual straight line exists between a j th magnetic leg and a (j+1) th magnetic leg adjacent to the j th magnetic leg among the P magnetic legs in each column, the second virtual straight line intersects with a projection of the first winding section to form third cross line segments, and the number of the third cross line segments is (2n+1), and the second virtual straight line intersects with a projection of the second winding section to form fourth cross line segments, and the number of the fourth cross line segments is (2n+1), wherein 1≤i≤Q−1, 1≤j≤P−1 and n≥1;
wherein the magnetic leg and the (i+1) th magnetic leg adjacent to the magnetic leg in each row have a first symmetric plane, and a (n+1) th cross line segment among the (2n+1) first cross line segments intersects with the first symmetric plane; a (n+1) th cross line segment among the (2n+1) second cross line segments intersects with the first symmetric plane; the j th magnetic leg and the (j+1) th magnetic leg adjacent to the j th magnetic leg in each column have a second symmetric plane, and a (n+1) th cross line segment among the (2n+1) third cross line segments intersects with the second symmetric plane; and a (n+1) th cross line segment among the (2n+1) fourth cross line segments intersects with the second symmetric plane.

11. The magnetic unit according to claim 10 , wherein
in the Q magnetic legs in each row, an innermost turn of the first winding section wound around the i th magnetic leg and an innermost turn of the second winding section wound around the i th magnetic leg are connected in series, and an innermost turn of the first winding section wound around the (i+1) th magnetic leg of the Q magnetic legs and an innermost turn of the second winding section wound around the (i+1) th magnetic leg are connected in series; and
in the P magnetic legs in each column, an innermost turn of the first winding section wound around the j th magnetic leg and an innermost turn of the second winding section wound around the j th magnetic leg are connected in series, and an innermost turn of the first winding section wound around the (j+1) th magnetic leg and an innermost turn of the second winding section wound around the (j+1) th magnetic leg are connected in series.

12. The magnetic unit according to claim 10 , wherein
in the Q magnetic legs in each row, a proportional value C between lengths of the (n+1) th cross line segment among the (2n+1) first cross line segments at two sides of the first symmetric plane is 0.7˜1.43, and a proportional value D between lengths of the (n+1) th cross line segment among the (2n+1) second cross line segments at two sides of the first symmetric plane is 0.7˜1.43; and
in t

Assignees

• Delta Electronics Shanghai Co

Inventors

• Wu Rui
• Ye Yiqing
• Zhou Yuan

Classifications

• H01F27/24 Primary

  Magnetic cores · CPC title

• H01F27/2804 Primary

  Printed windings · CPC title

• H01F2027/2809

  on stacked layers · CPC title

• H01F27/28

  Coils; Windings; Conductive connections · CPC title

• H01F27/306 Primary

  Fastening or mounting coils or windings on core, casing or other support · CPC title