Transformer bobbin

Details Transformer bobbin Transformer bobbin

2001-06-07

2002-11-12

Mai, Anh (Department: 2832)

Inductor devices

With supporting and/or spacing means between coil and core

Preformed insulation between coil and core

C336S208000, C336S192000

Reexamination Certificate

active

06480085

ABSTRACT:

This application incorporates by reference Taiwanese application Serial No. 89111197, Filed Jun. 8, 2000.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates in general to a transformer bobbin, and more particularly to a transformer bobbin for preventing the coils from a short circuit.
2. Description of the Related Art
The transformer mainly includes a bobbin and a core for transforming the voltage between the low-voltage port and the high-voltage port of the bobbin. The low-voltage port and the high-voltage port of the bobbin are wrapped around by the copper coils, and the core is placed on the middle and the sides of the bobbin, which is able to complete the voltage transformation.
Referring to
FIG. 1
, which depicts a three-dimensional diagram of a bobbin on the conventional transformer. The bobbin
100
includes a hollow sleeve
102
, the partitions
104
,
106
,
108
, and
110
, and the pin sets
112
and
114
. The core is placed in the hollow part of the hollow sleeve
102
(not shown in FIG.
1
), and the outside of the hollow sleeve
102
is wrapped around by the copper coils (not shown in FIG.
1
). The partitions
104
,
106
,
108
and
110
are perpendicular connected to the hollow sleeve
102
. The high-voltage port is formed by wrapping the copper coils around the hollow sleeve
102
between the partition
106
and
110
. The low-voltage port is formed by wrapping the copper coils around the hollow sleeve
102
between the partition
106
and
104
. The spools
120
,
122
and
124
represent the space between the partitions
110
and
108
, the space between the partitions
108
and
106
, the space between the partitions
106
and
104
, respectively. Moreover, the partitions
104
and
110
are perpendicular connected to the pin sets
112
and
114
, respectively. The pin sets
112
and
114
include a number of pins that are twined round by the starting point and the terminal point of the copper coils.
Referring to
FIG. 2A
, which depicts a diagram that parts of the copper coils wrap around the bobbin in FIG.
1
. Also, referring to
FIG. 2B
, which depicts a diagram that all of the copper coils wrap around the bobbin in FIG.
1
. First, the pin
116
is twined round by the starting point
200
of the copper wire, as shown in
FIG. 2A
, and then, the hollow sleeve
102
between partitions
108
and
110
is clockwise wrapped around by the copper wire to construct the copper coil
204
. In
FIG. 2B
, through a gap in the partition
108
(not shown in FIG.
2
B), the copper wire continuously wraps around the hollow sleeve
102
between partitions
106
and
108
. After completing the winding of the copper coil
204
, the copper wire passes the side edge of the partition
108
, and the terminal point
205
of the copper wire twines round the pin
118
.
In order to give a clear description thereinafter, the copper wire segment from the starting point
200
to the winding-started point A is defined as the leading copper wire
206
, and all of the copper coil
204
is defined as the coil body
208
, wherein the winding-started point A is the point that the copper wire starts to wrap around the hollow sleeve
102
.
Referring to
FIG. 3A
, which depicts a front view of the transformer in
FIG. 2B
along the X-axis. Also, referring to
FIG. 3B
, which depicts a lateral view of the transformer in
FIG. 2B
along the Y-axis. In
FIG. 3A
, the starting point
200
of the copper wire twins round the pin
116
, and then multiple layers of the copper coil
204
wraps around the hollow sleeve
102
. Portion of the leading copper wire
206
is lying on the pin set
114
, and the other portion is placed on the surface of the partition
110
that is parallel to the YZ-plane. Therefore, the leading copper wire
206
placed on the partition
110
touches the coil body
208
at the interface
302
.
In
FIG. 3B
, each circle represents a copper coil
204
outside of the hollow sleeve
102
. Similarly, the starting point
200
of the copper wire twins round the pin
116
, and part of the leading copper wire
206
touches the coil body
208
at the interface
302
.
Accordingly, it could cause some problems that the leading copper wire
206
touches the coil body
208
at the interface
302
. First, the high-voltage port includes spools
102
and
122
, and the voltage difference between the starting point
200
and the terminal point of the copper wire is very big, and it can be in the range of 1000 to 1200 voltage. Moreover, the voltage difference between the leading copper wire
206
and the upper layer of the coil body
208
, about 500 to 600 voltage, is also big. Therefore, the contact of the leading copper wire
206
and the coil body
208
is able to cause a short circuit if the insulating coating of the copper wire is defective. Second, the copper coil
204
wraps around the bobbin
100
by means of a rotating machine, and the rotational speed is pretty fast. Therefore, the copper coil
204
of the coil body
208
will rub against the leading copper wire
206
during the rotation, and the insulating effect disappears. If so, the transformer is broken and cannot work anymore.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a transformer bobbin, which the leading copper wire is isolated from the coil body. It can prevent the short circuit and raise the yield of the transformer.
The invention achieves the above-identified objects by providing a bobbin of a transformer for transforming voltage between a first port and a second port of the bobbin, the first port is wrapped around by a first copper wire and forming a plurality of copper coils of the first port, and the second port is wrapped around by a second copper wire and forming a plurality of copper coils the second port. The bobbin includes a hollow sleeve, a first pin set, a partition, and a second pin set. The hollow sleeve is a hollow polyhedron, wherein the hollow sleeve is wrapped around by the copper coils of the first port and copper coils of the second port. A winding-started point is near a corner of the hollow sleeve. The winding-started point is the point that the first copper wire starts to wrap around the hollow sleeve. The first pin set includes a first pin and a first griding slot, wherein the first pin is for being wrapped around by a starting point of the first copper wire, and the first griding slot is for placing the copper wire segment from the starting point to the winding-started point. The partition is for connecting the hollow sleeve and the first pin set. The second pin set includes a third pin and a fourth pin, wherein the third pin and the fourth pin are wrapped around by the starting point and the terminal point of the second copper wire, wire, respectively. The corner of the hollow sleeve is an intersection point of a top plane the hollow sleeve, a side plane of the hollow sleeve, and the partition.


REFERENCES:
patent: 4419814 (1983-12-01), Hasserjian
patent: 4916424 (1990-04-01), Kijima
patent: 5266916 (1993-11-01), Kijima
patent: 99/63554 (1999-09-01), None

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