Fully coupled magnetic device

Patent metadata

Field	Value
Publication number	US-11545301-B2
Application number	US-202117772108-A
Country	US
Kind code	B2
Filing date	Feb 8, 2021
Priority date	Mar 20, 2020
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

A fully coupled magnetic device includes at least two phases of circuits, with each phase formed by several coupling units connected in series. Every two phases of circuits are directly coupled through at least one coupling unit, and a direction of a magnetic field generated by DC (direct current) of one phase of the two phases of circuits is opposite to that of another phase of the two phases of circuits.

First claim

What is claimed is:

1. A fully coupled magnetic device, which comprises at least two phases of circuits, wherein each phase of the two phases of circuits comprises multiple coupling units ( 1 ) all of which are connected, every two phases of circuits are directly coupled through at least one coupling unit ( 1 ), and a direction of a magnetic field generated by DC (direct current) of one phase of the two phases of circuits is opposite to that of another phase of the two phases of circuits;
the fully coupled magnetic device further comprises multiple identical coupling units ( 1 ) arranged in a matrix of N rows×(N−1) columns, wherein the matrix of the coupling units ( 1 ) is denoted as: A=(a ij ) N×(N−1) , where a phase number N of the fully coupled magnetic device is an integer number≥2, a ij is the coupling unit in the i th row and j th column of the matrix A, i=1, 2, 3, . . . N, j=1, 2, 3, . . . N−1; each coupling unit ( 1 ) comprises a magnetic core ( 2 ), a forward winding coil ( 3 ) and a reverse winding coil ( 4 ), and the forward and reverse winding coils are wound on the magnetic core ( 2 ) or the magnetic core ( 2 ) wraps the forward and reverse winding coils, the number of turns of the forward and reverse winding coils is the same, and the magnetic fields in the magnetic core ( 2 ) generated by currents in the forward and reverse winding coils are opposite to each other in direction, and all N input terminals are located at one side of the matrix, and all N output terminals are located at the other side of the matrix; when p=1 (p represents phase number and varies from 1 to N), the 1 st phase current starts from the first input terminal, passes sequentially through the forward winding coil ( 3 ) within the coupling units of an, a 12 , a 13 , . . . a 1(N−1) , and then passes sequentially through the reverse winding coil ( 4 ) within the coupling units of a 2(N−1) , a 3(p−2) , a 4(N−3) , . . . a N1 , all connected in series until reaching the first output terminal to become the complete 1 st phase circuit; when p=2, 3, 4, . . . N−1, the p th phase current starts from the p th input terminal, passes through the reverse winding coil ( 4 ) of the coupling units a 1(p−1) , a 2(p−2) , a 3(p−3) , . . . a (p−1)1 , then passes through the forward winding coil ( 3 ) of the coupling units a p1 , a p2 , a p3 , . . . a p(N−1) , then passes through the reverse winding coil ( 4 ) of the coupling units a (p+1)(N−1) , a (p+2)(N−2) , a (p+3)(N−3) , . . . a Np , all connected in series until reaching the p th output terminal to become the p th phase circuit; when p=N, the N th phase current starts from the p th input terminal, passes through the reverse winding coil ( 4 ) of the coupling units a 1(p−1) , a 2(p−2) , a 3(p−3) , . . . a (p−1)1 , and then go through the forward winding coil ( 3 ) of the coupling units a p1 , a p2 , a p3 , . . . a p (N−1) , all connected in series until reaching the N th output terminal to become the N th phase circuit.

2. The fully coupled magnetic device according to claim 1 , wherein the forward winding coil ( 3 ) and the reverse winding coil ( 4 ) are both solenoid coils wound on the magnetic core ( 2 ), the magnetic core ( 2 ) has a single layer structure which is made from magnetic materials or a laminated structure which is formed by stacking multiple layers of magnetic materials and insulating materials in sequence, the magnetic core ( 2 ) has an open loop or a closed loop.

3. The fully coupled magnetic device according to claim 2 , wherein the coupling unit ( 1 ) adopts sequential multi-layer deposition and integration process, from bottom to top, comprises a bottom conductor layer ( 5 ), a magnetic core layer ( 6 ) and a top conductor layer ( 7 ); there is an insulating layer ( 8 ) between two adjacent layers, multiple through holes ( 9 ) are provided in the insulating layer ( 8 ) for connecting the bottom conductor layer ( 5 ) and the top conductor layer ( 7 ), the through holes ( 9 ) are filled with conductive materials, two layers of conductors form a spiral through the through holes ( 9 ) and are wound on the magnetic core layer ( 6 ), a conductive path is formed from the input terminal to the output terminal of each phase of circuit.

4. The fully coupled magnetic device according to claim 3 , wherein the bottom conductor layer ( 5 ), the magnetic core layer ( 6 ) and the top conductor layer ( 7 ) are all fabricated using conductive material by micro-nano fabrication method, and the insulating layer ( 8 ) is fabricated using insulating material by micro-nano fabrication method, the micro-nano fabrication method comprises photolithography, electrochemical deposition, physical vapor deposition, dry etching and wet etching.

5. The fully coupled magnetic device according to claim 1 , wherein the forward winding coil ( 3 ) and the reverse winding coil ( 4 ) are both stripline coils, and the magnetic core ( 2 ) comprises an upper layer and a lower layer, the magnetic core ( 2 ) wraps around the forward winding coil ( 3 ) and the reverse winding coil ( 4 ); the magnetic core ( 2 ) has a single layer structure which is made from magnetic materials or a laminated structure which is formed by stacking multiple layers of magnetic materials and insulating materials in sequence, the magnetic core ( 2 ) has an open loop or a closed loop.

6. The fully coupled magnetic device according to claim 5 , wherein the coupling unit ( 1 ) adopts sequential multi-layer deposition and integration process, from bottom to top, comprising a bottom magnetic core ( 10 ), a bottom conductor layer ( 11 ), a top conductor layer ( 12 ), and a top magnetic core ( 13 ); there is an insulating layer ( 8 ) between two adjacent layers; multiple through holes ( 9 ) are provided for connecting the top conductor layer ( 12 ) and the bottom conductor layer ( 11 ); the through holes ( 9 ) are filled with conductive materials, and a conductive path is formed from the input terminal to the output terminal of each phase of circuit.

7. The fully coupled magnetic device according to claim 6 , wherein the bottom magnetic core ( 10 ), the bottom conductor layer ( 11 ), the top conductor layer ( 12 ) and the top magnetic core ( 13 ) are all fabricated using conductive material by micro-nano fabrication method, and the insulating layer is fabricated using insulating material by micro-nano fabrication method, the micro-nano fabrication method comprises photolithography, electrochemical deposition, physical vapor deposition, dry etching and wet etching.

8. The fully coupled magnetic device according to claim 1 , wherein there are two magnetic cores ( 2 ), each magnetic core ( 2 ) comprises a bottom magnetic core ( 10 ) and a top magnetic core ( 13 ); the forward winding coil ( 3 ) and the reverse winding coil ( 4 ) are respectively spiral, and the top and bottom magnetic cores are respectively wrapped around both the forward winding coil ( 3 ) and the reverse winding coil ( 4 ) respectively; the bottom magnetic core ( 10 ) and the top magnetic core ( 13 ) of the each magnetic core ( 2 ) have a single layer structure which is made from magnetic materials or a laminated structure which is formed by stacking multiple layers of magnetic materials and insulating materials in sequence, the bottom magnetic core ( 10 ) and the top magnetic core ( 13 ) of the each magnetic core ( 2 ) have an open loop or a closed loop.

9. The fully coupled magnetic device according to claim 8 , wherein the coupling unit ( 1 ) adopts sequential multi-layer deposition and integration process, from bottom to top, comprising the bottom magnetic core ( 10 ), the lower wire layer ( 11 ), the upper wire layer ( 12 ) and the top magnetic core ( 13 ); there is an insulating layer ( 8 ) between two adjacent layers

Assignees

• Univ Hangzhou Dianzi

Inventors

• Wang Ningning
• Peng Shanfeng
• Yu Junchao
• Ciaran Feeney
• Ye Tingcong

Classifications

• H01F37/00

  Fixed inductances not covered by group H01F17/00 · CPC title

• H01F27/2804 Primary

  Printed windings · CPC title

• H01F38/14 Primary

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H01F2027/2809

  on stacked layers · CPC title

• H01F27/306

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