Inductor with variable air-gap separation

Details Inductor with variable air-gap separation Inductor with variable air-gap separation

2001-06-14

2003-06-24

Mai, Anh (Department: 2832)

Inductor devices

With closed core interrupted by an air gap

C336S234000, C336S200000

Reexamination Certificate

active

06583701

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an inductor with multiple air-gap separations, especially to an inductor having air-gap with multiple separations to provide better electrical property.
BACKGROUND OF THE INVENTION
The prior art inductor for large-current application generally has large-volume silicon-steel plates, and an air gap for increasing reluctance thereof, thus preventing saturation of the inductor. As shown in FIG.
1
A and
FIG. 1B
, an inductor
1
A is composed of an I-shaped silicon-steel plate
11
a
and an B-shaped silicon-steel plate
12
a
, and an air gap
13
a
with uniform separation between the I-shaped silicon-steel plate
11
a
and the B-shaped silicon-steel plate
12
a.
However, the air gap
13
a
with uniform separation has some disadvantages. If the air gap
13
a
is small, the inductor
1
a
is saturated and the inductance thereof is increased and temperature is increased in heavy load case (larger current). If the air gap
13
a
is large, the inductance is not enough to prevent harmonic distortion in low load case (small current). The temperature cannot be decreased to enhance efficiency in low output voltage and heavy load condition.
As can be seen from above description, the inductor having air gap with uniform separation has serious problem.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide an inductor with multiple air-gap separations to overcome above problem.
To achieve above object, the present invention provides an inductor with multiple air-gap separations comprises a magnetic core and an enameled wire around the magnetic core. The magnetic core has an air gap with at least a large-gap portion and a small-gap portion. The small-gap portion provides enough inductance in case of low load input to prevent harmonic distortion. The large-gap portion provides enough inductance in case of heavy load output and low input voltage to prevent saturation and temperature rise. The air gap has a surface of stair shape, bevel shape or a curved surface to optimize the electrical property of the inductor.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:


REFERENCES:
patent: 4874990 (1989-10-01), Dobnick
patent: 5047745 (1991-09-01), Marriott et al.
patent: 5155676 (1992-10-01), Spreen
patent: 5371486 (1994-12-01), Yamada et al.
patent: 5440225 (1995-08-01), Kojima
patent: 5889373 (1999-03-01), Fisher et al.
patent: 355128809 (1980-10-01), None

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