Inductor devices – Winding with terminals – taps – or coil conductor end...
Reexamination Certificate
2001-12-03
2003-02-04
Enad, Elvin (Department: 2832)
Inductor devices
Winding with terminals, taps, or coil conductor end...
C336S198000, C336S200000
Reexamination Certificate
active
06515567
ABSTRACT:
BACKGROUND OF THE INVENTION
1 Field of the Invention
The invention relates to a bobbin; in particular, the invention relates to a bobbin for a transformer.
2 Description of the Related Art
A conventional bobbin
10
for a transformer is shown in
FIG. 1
a
and
FIG. 1
b.
The bobbin
10
comprises a body
20
, a first partition wall
30
a
and a plurality of second partition walls
30
b.
The body
20
receives a bar core (not shown). A wire (not shown) fills the body
20
. The body
20
, the bar core and the wire constitute the transformer. The first partition wall
30
a
and the second partition walls
30
b
are formed on the body
20
. The body
20
is divided into a primary side
21
and a secondary side
22
by the first partition wall
30
a.
The wire comprises a first wire (not shown), filling the primary side
21
of the body
20
, and a second wire
60
filling the secondary side
22
of the body
20
.
Referring to
FIG. 1
a
and
FIG. 1
b,
the body
20
is provided with a plurality of winding grooves
34
, separated by the second partition walls
30
b,
on the secondary side
22
. Each of the second partition walls
30
b
is provided with a wire-guiding breach
31
and a protrusion
33
, as shown in
FIG. 1
a,
or a notch
35
as shown in
FIG. 1
b.
It is noted that all of the protrusions
33
are arranged in line, on the same side and the same level. Also, all of the notches
35
are arranged in line, on the same side and the same level.
A plurality of pins
50
are disposed on the secondary side
22
of the body
20
. One of the pins
50
is used as a starting terminal
50
a,
and one of the pins
50
is used as an ending terminal
50
b.
The starting end of the second wire
60
attaches to the starting terminal
50
a,
and the terminal end of the second wire
60
attaches to the ending terminal
50
b.
Between the second wire
60
attached to starting terminal
50
a
and the second wire
60
attached to ending terminal
50
b,
the second wire
60
fills the grooves
34
of the body
20
to form a winding (not shown). After the number of windings located in one of the grooves
34
, reaches a set number, the second wire
60
enters the next groove
34
through the breach
31
to continue the winding. Thus, a transformer with variable voltage is formed. To simplify the drawings,
FIG. 1
a
and
FIG. 1
b
simply show the second wire
60
adjacent to the starting terminal
50
a
and the ending terminal
50
b,
and the second wire filling the grooves is omitted.
After the second wire fills the grooves and forms a winding, the terminal end of the second wire is far from the ending terminal
50
b.
It is very dangerous to attach the terminal end of the second wire
60
to the ending terminal
50
b
without any support. When the terminal end of the second wire
60
, far from the ending terminal
50
b,
is attached to the ending terminal
50
b
without any support, the second wire
60
is liable to be broken. In addition, the second wire
60
, adjacent to the ending terminal
50
b,
is near the outmost portion of the winding that has the highest voltage. Thus, even though the second wire
60
is not broken, this portion of the second wire
60
is likely to experience short circuit due to its contact with the highest voltage of the winding resulted from undesired displacement.
To solve the above problems, various designs have been provided. In one of these designs, the second wire
60
is additionally twisted before it is attached to the ending terminal
50
b.
By twisting, the strength of the second wire
60
increases so as to avoid breaking. However, this design requires an additional twisting step, and still cannot properly hold the second wire
60
.
Alternatively, in another design as shown in
FIG. 1
a
and
FIG. 1
b,
the second wire
60
can be held by the protrusions
33
, or the second wire
60
can be supported by the notches
35
. While the notches
35
can support the second wire
60
in certain circumstances, they cannot fix the second wire
60
securely. For instance, the notches
35
can simply prevent the displacement of the second wire
60
resulting from the external force along an arrow X
1
in
FIG. 1
b,
but they cannot prevent the displacement of the second wire
60
resulted from the external force along an arrow X
2
in
FIG. 1
b.
The protrusions
33
may hold the second wire
60
, but they cannot fix the second wire
60
properly.
SUMMARY OF THE INVENTION
In order to address the disadvantages of the aforementioned bobbin, the invention provides a bobbin that can fix a wire properly without twisting the wire.
Accordingly, the bobbin of this invention comprises a body, a first partition wall, a second partition wall, at least one third partition wall, and two first pins. The first partition wall, having a first protrusion, is formed on the body. The body is divided into a primary side and a secondary side by the first partition wall. The second partition wall, having a second protrusion with a neck portion, is formed on the secondary side of the body. The third partition wall, having a third protrusion with a notch, is formed on the secondary side of the body so that the third partition wall is close to the second partition wall and away from the first partition wall. The first pins are disposed on the secondary side of the body in a substantially U-shape.
Furthermore, the second partition wall is provided with two first breaches. The third partition wall is provided with two second breaches corresponding to the first breaches respectively. Each of the second breaches is aligned with the corresponding first breach respectively.
Furthermore, the body is provided with two slots adjacent to the first pins respectively. The third protrusion has a first surface, the neck portion has a second surface, and the first surface is flush with the second surface.
Furthermore, each of the first pins is provided with a first arm, a second arm and a connecting section connecting the first arm and the second arm, and the connecting section is disposed outside the body. The first arm is provided with a step portion.
Furthermore, the secondary side of the body is provided with a plurality of grooves. The second partition wall is parallel with the first partition wall. The bobbin comprises a plurality of second pins disposed on the primary side of the body.
REFERENCES:
patent: 4904975 (1990-02-01), Medenbach
patent: 4939494 (1990-07-01), Masuda et al.
patent: 6078240 (2000-06-01), Huang
Chou Heng Cheng
Lin Chien-Chia
Wu Chen-Feng
Yeh Ming
Birch & Stewart Kolasch & Birch, LLP
Delta Electronics , Inc.
Enad Elvin
Nguyen Tuyen T.
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