Microwave oven capable of supplying AC power

Details Microwave oven capable of supplying AC power Microwave oven capable of supplying AC power

2000-02-10

2001-11-06

Leung, Philip H. (Department: 3742)

Electric heating

Microwave heating

With control system

C219S715000, C219S756000, C219S760000

Reexamination Certificate

active

06313450

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a microwave oven, and more particulary to a microwave oven capable of supplying alternating current power to outer electronic appliances.
2. Description of the Related Art
Generally, a microwave oven is designed to be driven solely by alternating current (hereinafter called AC) power, and accordingly requires an inverter for converting direct current (hereinafter called DC) power into AC power in the places where the AC power is not available.
Regarding the inverter for converting the DC power to AC power, the same applicant disclosed a non-directional frequency generator (hereinafter called NDFG) using rotational AC converting means for converting DC power into AC power in the Korean Patent Application Nos. 98-18589 (filed May 22, 1998) and 98-21117 (filed Jun. 8, 1998), which have not been opened to the public yet.
Hereinafter, the above NDFG will be briefly described as a related art with reference to the accompanying drawings.
FIG. 1
is a schematic view for showing the NDFG of a microwave oven driven by the DC power according to the related art of the present invention.
Referring to
FIG. 1
, the NDFG
100
includes a motor
110
driven by the DC for generating rotational force, a commutator
130
rotated by the motor
110
, and a plurality of brushes such as first, second, third, and fourth brushes
121
-
124
as shown in
FIG. 1
, which are in contact with the outer circumference of the commutator
130
. The commutator
130
includes a conductive part which is divided into an even number of parts, but into at least two parts
132
a
and
132
b
as shown in FIG.
1
. The conductive parts
132
a
and
132
b
have an insulating part
133
of a certain width formed therebetween. The conductive parts
132
a
and
132
b
are in simultaneous contact with at least two neighboring brushes of the brushes
121
-
124
. The DC is applied to the input sides of the first to fourth brushes
121
-
124
, while the output sides of the first to fourth brushes
121
-
124
are connected with a high voltage transformer (hereinafter called HVT).
Such a NDFG supplies the AC power while the brushes
121
-
124
thereof come in contact with the respective parts formed on the outer circumference of the commutator
130
, sequentially.
Once the AC power is generated, the AC power is applied to a primary coil of the HVT, and the AC power applied to the primary coil is stepped up to a higher voltage at a secondary coil of the HVT. By the higher voltage, the magnetron MGT is driven to generate the microwaves.
Although the microwave oven according to the related art of the present invention is capable of converting DC power into AC power, the microwave oven has an inefficiency in that the AC power generated at the microwave oven can not be supplied to the any outer electric appliances.
SUMMARY OF THE INVENTION
The present invention has been developed to overcome that above-mentioned problem of the related art, and accordingly, it is an object of the present invention to provide a microwave oven capable of supplying alternating current power which is converted from direct current power to other external electronic appliances.
The above object is accomplished by an AC/DC type microwave oven according to the present invention, including: a non-directional frequency generator for inputting direct current power and outputting alternating current power; a transformer for inducing the alternating current power outputted from the non-directional frequency generator into a certain alternating current power of a predetermined voltage, and for outputting the induced alternating current power; and an outlet section for supplying the outputted certain alternating current power.
The transformer includes a primary coil section for inputting the alternating current power induced from the non-directional frequency generator; a first secondary coil section for inducing a higher voltage for driving a magnetron; a filament coil section for supplying a filament voltage to drive the magnetron; and a second secondary coil section for inducing commonly used alternating current power to supply the commonly used alternating current power.
The first secondary coil section, the second secondary coil section, and the filament coil section are switched on/off by first, second, and third switching sections, respectively, in a manner that the first and third switching sections are switched on to drive the first secondary coil section and the filament coil section for driving the magnetron, while, the second switching section is switched on to drive the second secondary coil section for supplying the certain alternating current power.
The microwave oven includes a button inputting section having a microwave oven operating button for driving the magnetron, and a voltage supplying button for outputting the certain alternating current power, and the first to third switching sections are on/off controlled by a microcomputer in accordance with a selection made through the button inputting section. The first and third switching sections, and the second switching section are driven separately, or simultaneously. The first to third switching sections are relays.
The outlet section for supplying the certain alternating current power is a socket outlet.


REFERENCES:
patent: 4332993 (1982-06-01), Shibahara et al.
patent: 4866572 (1989-09-01), Blodgett
patent: 4904837 (1990-02-01), Low et al.
patent: 5321235 (1994-06-01), Makino et al.
patent: 5347109 (1994-09-01), Nakabayashi et al.
patent: 0 171 170 A2 (1986-02-01), None
patent: 2 206 750 A (1989-01-01), None
patent: 58-18895 (1983-02-01), None
patent: 6-243962 (1994-09-01), None

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