Mini transformer

Details Mini transformer Mini transformer

2000-07-28

2002-04-09

Mai, Anh (Department: 2832)

Inductor devices

Winding with terminals, taps, or coil conductor end...

C336S233000, C336S198000, C336S208000

Reexamination Certificate

active

06369681

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a mini transformer with improved insulation feature.
BACKGROUND OF THE INVENTION
There is trend to minimize the size of a product in modern days. This is true particularly to electrical/electronic products. A conventional mini transformer commercially available for fulfilling such needs is shown in FIG.
1
. The mini transformer comprises a coil
10
, a core
11
, and a plurality of pins
14
and
15
with one ends embedded in a plurality of plastic pegs
12
at primary winding and a plurality of plastic pegs
13
at secondary winding respectively. Plastic pegs
12
and
13
are provided at the bottom of core
11
. A plurality of conductors
101
are electrically connected between pins
14
and coil
10
, while a plurality of conductors
102
are electrically connected between pins
15
and coil
10
wherein conductors
101
and
102
are soldered to coil
10
. One can connect a desired electrical device between a conductor
101
and a conductor
102
when using the transformer. But this is unsatisfactory for the purpose for which the present invention is concerned for the reason of poor insulation caused by its mini size.
A mini transformer aimed at eliminating above problem is shown in FIG.
2
. The improvement is that an elongate groove
121
is provided across the upper portions of plastic pegs at either side. These grooves
121
can increase the electrical paths from pins
14
and
15
to core
11
respectively, resulting in an increase of insulation. But this design suffered from a drawback, i.e., a structural destruction of the pins
14
and
15
. Further, the increase of insulation is limited. To the worse, neither of above designs complies with insulation regulations. Thus improvement still exists.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a mini transformer mounted in an electrical device comprising a coil, a core, and a plurality of pins with one ends embedded in a plurality of plastic pegs at primary winding and a plurality of plastic pegs at secondary winding respectively. Plastic pegs are provided at the bottom of core. Conductors are electrically connected between pins and coil by soldering. Insulated flanges are provided on both sides of core at the junctions between plastic pegs and core. This can increase the electrical paths from pins to core without damaging the structures of plastic pegs. Also, it does not increase the height of transformer. Further, the total width of this mini transformer after the increase of the extended widths of insulated flanges is still within the allowable range of the original mini transformer. Thus no modification to the corresponding electrical device is required. Most importantly, it complies with insulation regulations.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.


REFERENCES:
patent: 4760366 (1988-07-01), Mitsui
patent: 5315280 (1994-05-01), Stokes et al.
patent: 5977855 (1999-11-01), Matsumura et al.
patent: 6072380 (2000-06-01), Monroe
patent: 6078240 (2000-06-01), Huang

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