Transformer with high coupling efficiency

Details Transformer with high coupling efficiency Transformer with high coupling efficiency

2000-10-17

2002-03-26

Mai, Anh (Department: 2832)

Inductor devices

With supporting and/or spacing means between coil and core

Preformed insulation between coil and core

C336S200000, C336S208000, C336S192000

Reexamination Certificate

active

06362715

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a transformer, and more particularly, to a transformer with high coupling efficiency.
BACKGROUND OF THE INVENTION
A chip coil transformer is an important device in the surface mounting technology and it is usually assembled on a circuit substrate to provide a variety of voltages for the circuit.
FIG. 1
illustrates the chip coil transformer
10
of the prior art. The prior chip coil transformer
10
includes a bobbin
12
, low-voltage conducting wires
13
, high-voltage conducting wires
14
, and a core
15
. A plurality of partitions
16
and pins
17
are disposed on the bobbin
12
. A winding region
18
is formed between two of the partitions
16
, and there are seven winding regions
18
-
24
formed on the bobbin
12
as shown in FIG.
1
. Low-voltage conducting wires
13
are wound onto the winding region
18
to form a low-voltage winding loop. High-voltage conducting wires
14
are wound onto the winding region
19
-
24
to form a high-voltage winding loop. Each two of the winding regions
18
-
24
are isolated by means of each corresponding partition
16
. Besides, each pin
17
functions as an output and an input for the low-voltage conducting wires
13
or the high-voltage conducting wires
14
.
However, because the low-voltage conducting wires
13
and the high-voltage conducting wires
14
are wound onto the same bobbin
12
, the coupling efficiency of the low-voltage winding loop and the high-voltage winding loop on the winding regions
18
and
24
, which are at both ends of the bobbin
12
, is not desirable. The length of the bobbin
12
is not easy to be reduced either. Moreover, each of the partitions
16
provided to isolate the winding regions
18
-
24
occupies a certain space, and therefore the industry faces a technical problem in minimizing the electronic parts.
SUMMARY OF THE INVENTION
To solve the above problem, the present invention provides a transformer with high coupling efficiency including a substrate, a bobbin, and a device. The substrate having M sets of pads and M sets of lower conducting wires is defined to have a front surface and a rear surface. Each set of pads includes a first pad and a second pad provided on the substrate acting as connecting point for the front surface and the rear surface of the substrate. Each set of the lower conducting wire is provided on the rear surface of the substrate to connect the first pad and the second pad of the corresponding set of pads. The bobbin is provided on the substrate functioning as a winding reel for a high-voltage conducting wire. The device having N sets of upper conducting wires is disposed on the bobbin. Each set of upper conducting wire connect the first pad of one set of pads with the second pad of another set of pads adjacent to the one set of pads. And these N sets of upper conducting wires connect respectively with the M sets of lower conducting wires by these M sets of pads to form a low-voltage winding loop on the device and the rear surface of the substrate. Because the low-voltage winding loop and the high-voltage winding loop of the present invention are located respectively on the device, the rear surface of the substrate, and the bobbin, the transformer of the present invention may have higher coupling efficiency. Besides, because there appears to be no partition formed on the bobbin, the transformer of the present invention is characterized by minimizing its volume.


REFERENCES:
patent: 5319342 (1994-06-01), Kuroki
patent: 5461353 (1995-10-01), Eberhardt
patent: 5754088 (1998-05-01), Fletcher et al.
patent: 5996214 (1999-12-01), Bell
patent: 6144278 (2000-11-01), Nishida et al.

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