Electricity: motive power systems – Automatic and/or with time-delay means – Responsive to thermal conditions
Reexamination Certificate
2000-02-10
2001-10-23
Ip, Paul (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
Responsive to thermal conditions
C318S471000, C219S702000, C062S089000
Reexamination Certificate
active
06307343
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hood motor of a gas range, and more particulary to a driving controlling apparatus of a hood motor for switching on/off the driving of the hood motor and for controlling the rotational speed of a hood motor.
2. Description of the Related Art
Generally, a hood motor ventilates hot-air generated from the lower side of a gas range, and the odor of foods being cooked. Such a hood motor includes a driving controlling apparatus for starting/stopping the driving of the motor, and for controlling the rotational speed of the motor by using a temperature sensor installed therein for sensing the temperature rise.
FIG. 1
is a circuit diagram for showing a conventional driving controlling apparatus of a hood motor.
As shown in
FIG. 1
, the conventional driving controlling apparatus of the hood motor includes a hood motor
1
, a thermal cut out (hereinafter called TCO), a motor driving relay
2
, and a motor rotational speed switching relay
3
.
The hood motor
1
includes a temperature protector (hereinafter called T/P), inductors L
1
, L
2
, and L
3
, and a capacitor C. Between the inductors L
2
and L
3
of the hood motor
1
, a low-velocity transfer contact L of the motor rotational speed switching relay
3
is connected, while a high-speed transfer contact H is connected between the inductors L
1
and L
3
of the motor rotational speed switching relay
3
.
Further, the motor driving relay
2
includes an exciting coil which is connected with a motor driving button, while both ends of the TCO are connected with a switching terminal T
1
and a switching-on contact, respectively.
The exciting coil of the motor rotational speed switching relay
3
is connected with a speed switching button which is manipulated by a user, while another switching terminal T
2
is connected with the switching-on contact of the motor driving relay
2
.
In the driving controlling apparatus of the hood motor constructed as above, when the user wants to ventilate the gas range, the user manipulates the motor driving button to connect the switching terminal T
1
of the motor driving relay
2
to the switching-on contact. Accordingly, commonly used alternating current (hereinafter called AC power) is applied to the hood motor
1
, so that the hood motor
1
is rotatably driven.
In such a situation, when the user manipulates the speed switching button, the motor rotational speed switching relay
3
varies the rotational speed of the hood motor
1
, in accordance with the contact of the switching terminal T
2
with the low-velocity transfer contact L or with the highvelocity transfer contact H, by the selective manipulation of the user through the speed switching button.
Meanwhile, when the temperature in the gas range rises over a certain temperature, the TCO which senses such a temperature rise is switched on. Accordingly, the hood motor
1
is rotatably driven by AC power due to a closed circuit formed by the TCO, even when the switching terminal T
1
of the motor driving relay
2
is not switched on to the switching-on contact.
In such a situation, also, the rotational speed of the hood motor
1
is adjusted by the user who manipulates the speed switching button by selectively switching the motor rotational speed switching relay
3
.
In the conventional driving controlling apparatus of the hood motor, however, since expensive relays have to be employed to switch on/off the hood motor and to control the rotational speed of the hood motor, the manufacturing cost is considerably higher. Further, as the relays are frequently used, there occurs poor contact of the relays, so that the driving reliability of the circuit is deteriorated.
Accordingly, there is a growing demand for a driving controlling apparatus that can substitute the conventional hood motor driving method employing expensive relays, which is inexpensive, and has higher reliability.
SUMMARY OF THE INVENTION
The present invention has been developed to overcome the above-mentioned problems of the related art, and accordingly, it is an object of the present invention to provide a driving controlling apparatus of a hood motor capable of on/off driving the hood motor and controlling the rotational speed of the hood motor without employing expensive relays, by the pulse width modulation controlling of a microcomputer.
Another object of the present invention is to provide a driving controlling apparatus of a hood motor capable of on/off driving the hood motor by sensing a temperature rise in a gas range even without a pulse width modulation controlling of a microcomputer.
The above objects are accomplished by a driving controlling apparatus of a hood motor according to the present invention, including: hood motor means rotatably driven for ventilating the inner portion of a system; main controlling means for generating control signals for controlling the operation of the hood motor, sub-controlling means for controlling the driving of the hood motor by sensing temperature change in the system; and driving circuit means for controlling the driving of the hood motor in accordance with the control signal of the main controlling means and the driving controlling of the sub-controlling means.
Preferably, the main controlling means generates control signals for on/off driving the hood motor, and for controlling the switching of the rotational speed of the hood motor.
More preferably, the main controlling means includes: a microcomputer for outputting pulse width modulation control signals of varied duty cycle in accordance with a low-speed mode and a high-speed mode; and a transistor on/off driven by the pulse width modulation control signals from the microcomputer, for generating pulse signals.
Further, the sub-controlling means includes: a printed circuit board power circuit for generating a certain driving voltage; a voltage dividing circuit for dividing a certain driving voltage from the printed circuit board power circuit; and a temperature switch for sensing a temperature rise of the inner portion of the system to a certain degree, the temperature switch being switched on/off for applying the partial voltage divided by the voltage dividing circuit into the driving circuit means.
Further, the driving circuit means includes: a switching regulator for outputting driving pulse signals of a certain frequency by pulse signals applied from a transistor of the controlling means; and a transistor driven by the driving pulse signals from the switching regulator for controlling the applying of direct current power to the hood motor from the rectifier circuit means.
In a driving controlling apparatus of a hood motor constructed as above according to the present invention, since inexpensive transistors are employed to on/off drive the hood motor and to control the rotational speed of the hood motor, instead of the conventionally-used expensive relays, the manufacturing cost is significantly reduced.
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Cho Young-Won
Lee Sung-ho
Bushnell , Esq. Robert E.
Ip Paul
Samsung Electronics Co,. Ltd.
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