MAGNETIC ELEMENT HAVING IMPROVED TRANSFORMERS AND COMMOM MODE CHOKES

• US 20110122589A1
• Filed: 11/22/2010
• Published: 05/26/2011
• Est. Priority Date: 11/20/2009
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: LIN, CHIH-MIN, HU, JIAN-SHE, HUANG, CHAO-TUNG, XU, YONG-CHUN, HUANG, KUO-CHUAN, WU, LI-CHUN
• Granted Patent: US 9,101,071 B2
• Time in Patent Office: Days
• US Class Current: 361/760
• CPC Class Codes: H01F 27/28 Coils; Windings; Conductive connections
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01R 12/526 the printed circuits being on the same board with plated through holes H05K3/42
• CPC Class Codes: H01R 13/6633 with inductive component, e.g. transformer
• CPC Class Codes: H05K 1/165 incorporating printed inductors
• CPC Class Codes: H05K 1/181 associated with surface mounted components
• CPC Class Codes: H05K 2201/086 for inductive purposes, e.g. printed inductor with ferrite core
• CPC Class Codes: H05K 2201/097 Alternating conductors, e.g. alternating different shaped pads, twisted pairs; Alternating components
• CPC Class Codes: H05K 2201/1003 Non-printed inductor
• CPC Class Codes: H05K 2201/1034 Edge terminals, i.e. separate pieces of metal attached to the edge of the printed circuit board [PCB]
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.

Abstract

A magnetic element (100) includes a board unit (2) including a paddle board (21) having a row of first conductive vias (251) and a row of second conductive vias (252) for insertion of terminals (3), a number of embedded magnetic components (22), and a number of SMDs (surface mount devices) (23) mounted on the paddle board by SMT (surface mount technology). Each embedded magnetic component includes a magnetic core (221) embedded in the paddle board, and a number of PCB (printed circuit board) layout traces (222) disposed in the paddle board. Each PCB layout trace includes a first PCB layout trace (222a) encircling around the magnetic core and connecting with the first conductive via, and a second PCB layout trace (222b) encircling around the magnetic core and connecting with the SMD.

Claims

1. A magnetic element comprising:

an insulative housing defining a receiving cavity;

a board unit received in the receiving cavity and comprising a paddle board having a row of first conductive vias and a row of second conductive vias, a plurality of embedded magnetic components and a plurality of SMDs (surface mount devices) mounted on the paddle board between the row of first conductive vias and the row of second conductive vias by SMT (surface mount technology), each embedded magnetic component comprising a magnetic core embedded in the paddle board, and a plurality of PCB (printed circuit board) layout traces disposed in the paddle board, each of said plurality of PCB layout traces comprising a first PCB layout trace having one end encircling around the magnetic core and another end connecting with one of the first conductive vias, and a second PCB layout trace having one end encircling around the magnetic core and another end connecting with the SMD; and

two rows of terminals respectively electrically connecting with the row of first conductive vias and the row of second conductive vias of the paddle board for being mounted on a mother board.

2. The magnetic element as claimed in claim 1, wherein said embedded magnetic components are made into transformers, and said SMDs are made into common mode chokes.

3. The magnetic element as claimed in claim 1, wherein said paddle board has a plurality of conductive pads provided thereon, said SMDs being soldered on the conductive pads, said second PCB layout trace connecting with the SMD by way of corresponding conductive pad.

4. The magnetic element as claimed in claim 3, wherein said paddle board has opposite first and second side faces, said conductive vias extending through the first and second side faces, said first PCB layout trace being disposed in the first side face, said second PCB layout trace being disposed in the second side face, said conductive pads being provided on the second side face.

5. The magnetic element as claimed in claim 1, wherein each terminal comprises a connecting portion, a soldering portion and a body portion between the connecting portion and the soldering portion.

6. The magnetic element as claimed in claim 5, wherein said insulative housing comprises a pair of periphery walls, said body portions of two rows of terminals mounted through the pair of periphery walls by insert-molding.

7. The magnetic element as claimed in claim 5, wherein said soldering portions of the terminals being coplanar at an imaginary plane parallel with the paddle board.

8. The magnetic element as claimed in claim 5, wherein said connecting portions of the terminals are inserted in the conductive vias.

9. The magnetic element as claimed in claim 5, wherein said connecting portions of the terminals are soldered with the conductive vias via soldering balls.

10. A method of making a PCB (printed circuit board) assembly, comprising steps of:

providing a printed circuit board with a plurality of embedded magnetic components therein, two rows of vias arranged along two opposite side regions thereof, a plurality of pads formed on at least one of two opposite surfaces thereof, a plurality of traces formed on both said two opposite surfaces thereof, each of said trace linking to at least one of the embedded magnetic component, the via or the pad;

applying a plurality of SMDs (surface mount devices) upon said at least one of the two opposite surfaces through SMT (surface mount technology), each linked to the corresponding pads; and

assembling a plurality of terminals to the corresponding vias, respectively.

11. The method of claim 10, wherein the SMDs are essentially linked between the embedded magnetic components and the corresponding terminals on said at least one of the two opposite surfaces.