Embedded transformer

Details Embedded transformer Embedded transformer

2001-08-30

2003-07-01

Mai, Anh (Department: 2832)

Inductor devices

Windings

Having conductor of particular shape

C336S200000, C336S232000

Reexamination Certificate

active

06587026

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a transformer, and more particularly to an embedded transformer.
2. Description of the Prior Art
A conventional transformer bobbin
10
, as shown in
FIG. 1
, is composed of a bobbin
10
and cores
20
,
30
. The tubular body of the bobbin
10
is used to accommodate the central posts
25
of the cores
20
,
30
and providing winding of wire formed thereon. The wire includes the wire of primary side (not shown) and the wire of secondary side
60
, thereafter called wire
60
for short. A plurality of partition walls
50
are formed on the surface of the bobbin
10
so as to isolate the primary side, the secondary side and a plurality of winding grooves located on the secondary side. Each of the partition walls
50
further has a notch
51
formed thereon.
Still referring to
FIG. 1
, the secondary side of the bobbin
10
further has two pins, including a start terminal
70
a
and an ending terminal
70
b.
Among these, the start terminal
70
a
is used as a terminal from which winding of wire
60
is started and the ending terminal
70
b
is used as a terminal at which winding of wire
60
is terminated. During the wire
60
extends from the start terminal
70
a
to the ending terminal
70
b,
the wire
60
passes the winding groove so as to form windings. Once the winding number of a winding groove conforms to a predetermined value, the wire
60
extends to the next adjacent winding groove, through the above-mentioned notch
51
, to form another winding. However, for the simplification of drawing, the present invention merely depicts the wire
60
adjacent to the start terminal
70
a
and the ending terminal
70
b
. Unfortunately, during the wire
60
passes the notch
51
, the notch
51
is liable to scrape the insulating coating formed on the wire
60
and result in a short circuit.
In sum, the complex bobbin is required for the conventional transformer. Besides, during the wire passes the notch, the insulating coating formed on the wire may be scraped off and result in a short circuit. Accordingly, there has been a strong felt need for a novel transformer for solving the above-mention problems.
SUMMARY OF THE INVENTION
Therefore, the main object of the present invention is to provide a novel transformer can overcome aforementioned problems.
Another object of the present invention is to provide a novel transformer can fully take advantage of the resource of the user.
The advantages of the present invention are described as follows. Because the present transformer is embedded in the board, the present transformer has a lower profile compared to the conventional transformer. In the present invention, the required bobbin for the conventional trans former can be omitted. Since the bobbin is omitted, the present invention prevents the insulating coating coated on the wire from scraped off during the wire passes through the notch. Short-circuiting is thus avoided. The manufacturing cost is obviously reduced since the present transformer fully takes advantage of the resource of the user.
The above objects of the present invention are achieved by providing an embedded transformer embedded in a board. The embedded transformer includes a board, a first insulating sheet, a preformed coil, a second insulating sheet, a first core and a second core. Among these, the board includes a conductive pattern formed on an upper surface of the board. A part of the conductive pattern serves as a primary coil of the embedded transformer. The board does not only serve as the base of the conductive pattern, but also includes some electrical component and circuit formed on the remaining part. The designer of the board previously forms the conductive pattern. Besides, the conductive pattern can be formed based on the typical process for forming the trace on the printed circuit board.
The first insulating sheet is formed on the conductive pattern. The preformed coil is formed on the first insulating sheet and serves as a secondary coil of the embedded transformer. Besides, the interposed first insulating sheet electrically insulates the preformed coil form the conductive pattern. The preformed coil further includes a second insulating sheet formed thereon. The first core and the second core are formed on the second insulating sheet and the lower surface the board, respectively. Additionally, the first core and the second core are partially embedded in the board so as to be coupled to each other.


REFERENCES:
patent: 5319342 (1994-06-01), Kuroki
patent: 5565837 (1996-10-01), Godek et al.
patent: 6069548 (2000-05-01), Baarman et al.
patent: 6181232 (2001-01-01), Kitamura

Affiliated with

Also associated with

Rating

Embedded transformer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Embedded transformer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Embedded transformer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3056577