Flyback transformer with core grounded

Details Flyback transformer with core grounded Flyback transformer with core grounded

2000-02-03

2002-04-16

Mai, Anh (Department: 2832)

Inductor devices

With supporting and/or spacing means between coil and core

Preformed insulation between coil and core

C336S096000, C336S107000

Reexamination Certificate

active

06373367

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a flyback transformer, and more particularly, to a flyback transformer with a core grounded.
BACKGROUND OF THE INVENTION
A flyback transformer is generally implemented within the circuits of a display device for providing distinctive voltages required by the circuits operation of the display device. Some U.S. Patents, i.e. U.S. Pat. Nos. 5,160,872, 5,287,479, 4,144,480 and 4,475,097 may be referred in order to have an in-depth understandings of structures of the flyback transformer and functions of High Voltage output, Focus output and Screen output of the flyback transformer.
Please refer to
FIGS. 1 and 2
.
FIG. 1
is a schematic diagram of a flyback transformer
10
according to the prior art.
FIG. 2
is an exploded diagram of the flyback transformer
10
shown in
FIG. 1. A
flyback transformer
10
of the prior art comprises a low-voltage bobbin
12
, a high-voltage bobbin
14
, an upper core
16
, a lower core
18
, a housing
20
and a clip
22
. The assembly procedure of the flyback transformer
10
comprises: first, installing a winding shaft (not shown) of the low-voltage bobbin
12
into a shaft hole (not shown) of the high-voltage bobbin
14
; secondly, installing the low-voltage bobbin
12
and high-voltage bobbin
14
into the housing
20
; finally, mounting the upper and lower cores
16
,
18
on the low-voltage bobbin
12
by the clip
22
to form the flyback transformer
10
.
Please refer to FIG.
3
.
FIG. 3
is an assembly diagram of the low-voltage bobbin
12
, clip
22
and upper and lower cores
16
,
18
. The clip
22
is formed of a thicker metal wire rod, such as stainless or piano wire, subjected to surface treatment, such as galvanization or tinning and bent in a U-shape, a grounding end
24
being bent from and integral with the lower end of clip
22
. And then, the grounding end
24
is mounted onto a predetermined bore of a printed substrate (not shown) for grounding the upper and lower cores
16
,
18
. In addition, fitting holders
28
are provided on the outer surface of low-voltage bobbin
12
as shown in
FIG. 3 and a
positioning fitting
26
is fitted onto the low-voltage bobbin
12
and fixed at both ends to the fitting holders
28
for positioning the grounding end
24
. Nevertheless, the positioning fitting
26
really provides the grounding end
24
with high positional accuracy, it always leads to increase product cost and assembly complexity of the flyback transformer
10
. So the positioning fitting
26
is not used extensively for the flyback transformer
10
.
SUMMARY OF THE INVENTION
It is therefore a primary objection of the present invention to provide a flyback transformer with a core grounded to solve the above mentioned problem.
In a preferred embodiment, the present invention provides a flyback transformer comprising a core, a low-voltage bobbin and a conductive device. The core comprises an upper core and a lower core. The low-voltage bobbin comprises a skirt. The skirt has a lower opening for receiving the lower core and a grounding pin is provided on a side portion of the skirt. The conductive device comprises an U-shaped body, an input end and an output end. The U-shaped body is engaged with the side portion of the skirt. The input end is provided on one end of the U-shaped body for flexibly connecting the lower core. The output end is provided on the other end of the U-shaped body for connecting the grounding pin. The core is grounded by the way of connecting the lower core and the grounding pin through the conductive device.
These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment which is illustrated in the various figures and drawings.


REFERENCES:
patent: 4246636 (1981-01-01), Kawamura et al.
patent: 4475097 (1984-10-01), Kikuchi
patent: 4499522 (1985-02-01), Nakamura
patent: 5798682 (1998-08-01), Kim et al.
patent: 5898354 (1999-04-01), Lee

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