Switching Transformer

• US 20090231078A1
• Filed: 12/05/2006
• Published: 09/17/2009
• Est. Priority Date: 12/05/2005
• Status: Abandoned Application

• Current Assignee: Tamura Corporation
• Original Assignee: Tamura Corporation
• Inventors: Watanabe, Osamu
• Application Number:
  US12/096,032
• Publication Number:
  US 20090231078A1
• Time in Patent Office: Days
• US Class Current: 336/192
• CPC Class Codes: H01F 2005/043 having multiple pin terminals, e.g. arranged in two parallel lines at both sides of the coil
• CPC Class Codes: H01F 27/027 specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
• CPC Class Codes: H01F 27/266 Fastening or mounting the core on casing or support on coil H01F27/30
• CPC Class Codes: H01F 27/325 Coil bobbins formers for coils in general H01F5/02
• CPC Class Codes: H01F 3/10 Composite arrangements of magnetic circuits
• CPC Class Codes: H01F 41/064 Winding non-flat conductive wires, e.g. rods, cables or cords
• CPC Class Codes: H01F 41/098 Mandrels; Formers
• CPC Class Codes: H01F 5/02 wound on non-magnetic supports, e.g. formers
• CPC Class Codes: Y10T 29/49071 by winding or coiling

Abstract

There is provided a switching transformer which enables material costs to be reduced while the performance to be improved, permitting cost and size reductions, and which is suitable for mass production by ensuring good assemblability. Instead of using a conventional coil bobbin having a winding drum part, a center-leg-having core 3 having the shape of a substantially inverted T is integrated with a terminal block 1 having a substantially flat upper surface and terminals implanted in a lower surface. An electric wire 6a is wound around the outer circumference of a center-leg core 3b protruding from the upper surface 1a of the terminal block 1, thereby a coil 6 is mounted. A C-type core 4 is built into this assembly to form a switching transformer.

Claims

1-8. -8. (canceled)

9. A method of manufacturing a switching transformer, comprising the steps of:

inserting a center-leg core of a center-leg-having core which has a substantially inverted T-shaped section, into a hole for inserting the center-leg core formed in a center part of a terminal block which has terminals implanted in a lower surface thereof and a substantially flat upper surface, to integrate the terminal block and the center-leg-having core;

winding an insulating tape on the outer circumference of the center-leg core protruding from the upper surface of the terminal block, and winding margin tapes on respective end portions of the center-leg core;

rotating the center-leg core to wind an electric wire between the margin tapes, to mount a coil; and

subsequently, assembling the switching transformer by placing, from the upper surface side of the terminal block, a substantially Π

-shaped, side-leg-having C-type core having side-leg cores formed on both end portions of a connecting part, making an inner surface of the connecting part abut to a top end surface of the center-leg core, and connecting bottom faces of the side leg cores through a spacer to respective end portions of a top surface of a core body of the center-leg-having core.

10. A switching transformer comprising:

a terminal block which has a substantially flat upper surface, terminals implanted in a side portion of a lower surface, a hole formed in a center portion thereof and a rib formed around the hole;

a substantially-inverted-T-shaped center-leg-having core, having a core body positioned on a lower face of the terminal block, and a center-leg core which is formed on a center part of the core body, inserted through the hole of the terminal block and protruding from the upper surface of the terminal block;

an insulating tape wound around the outer circumference of the center-leg core;

margin tapes wound respectively around both end portions of the center-leg core;

a coil wound between the margin tapes; and

a substantially Π

-shaped, side-leg-having C-type core, having a connecting part and side-leg cores formed on respective end portions of the connecting part,

wherein the side-leg-having C-type core is assembled from the upper surface side of the terminal block so as to straddle the coil, bottom surfaces of the side-leg cores are connected through a spacer to respective end portions of a top surface of the core body of the center-leg-having core, and an inner surface of the connecting part is abutted to a top end surface of the center leg core.