JPH0546205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an electric cooking device, such as an electric rice cooker, which has a function of displaying cooking steps.

(B) Conventional technology In recent years, for example, a control circuit configured with a one-chip microcomputer has been used to perform a preheating process to preheat a pot and make the rice in the pot sufficiently absorb moisture. Next, the rice cooking process,
An electric rice cooker is provided in which a steaming process and a warming process are performed in this order. By the way, among such electric rice cookers, for example,
As disclosed in Japanese Patent No. 155221, there is a method in which the cooking process is displayed using a display such as a light emitting diode. This kind of electric rice cooker is
For example, in a store, it is desirable to drive a display without driving a heater such as a heater in order to improve the display effect and explain the operation to consumers. The operations were synchronous and the above operations could not be performed.

(c) Problems to be solved by the present invention In consideration of the above-mentioned drawbacks, the present invention provides an electric cooking method that can be used to improve the display effect and easily explain the operation to consumers, for example in stores. The purpose is to provide equipment.

(d) Means for Solving Problems The present invention is an electric cooker, which includes a first control means for controlling cooking heating, a second control means for controlling a display, and a reference signal to the first control means. a reference signal generating means for determining whether or not the output of the reference signal generating means is input to the first control means; The present invention is characterized by comprising a third control means that is driven in synchronization with or asynchronously with the control means.

(E) Effect Since the present invention is constructed as described above,
It is possible to automatically select whether to drive the second control means synchronously or asynchronously with the first control means.

(f) Examples Examples of the present invention will be described based on the drawings. First, FIG. 1 is a partial sectional view of the electric rice cooker of the present invention.
In the figure, 1 is a cylindrical inner case 2 with a bottom, and a cylindrical outer case.
(3) and a rice cooker body consisting of a bottom lid 4 etc. that covers the bottom opening of the outer case; 5 is a lid; 6 is a pot housed in the inner case 2; 7 is a heater that heats the bottom of the pot;
Reference numeral 8 denotes a heat-sensitive part provided so as to be in pressure contact with the outer bottom surface of the pot 6, and a thermistor described later is thermally attached inside the heat-sensitive part, and the temperature of the pot 6 can be sensed by this thermistor. has been done. 9 is a case for storing electrical components, 10A, 1
0B, 10C, and 10D are light emitting diodes provided on the side surface of the outer case 3 facing the outside, and are used to display the preheating process, rice cooking process, steaming process, and warming process. A first operation knob 11 is slidably provided on the side surface of the outer case 3, and is used to operate a power switch, which will be described later. A second operating knob 12 is slidably provided on the bottom surface of the outer case 3, and is used to operate a switch to be described later.

Next, Fig. 2 is a schematic electrical circuit diagram of the electric rice cooker mentioned above, and 13 in the figure is the first electrical circuit that controls cooking heating.
The control means is composed of a control circuit 13A composed of, for example, a microcomputer, and a switching element 13B connected in series to the heater 7. 14 is the light emitting diode 10A, 10B,
10C, 10D, the ring counter 14A, the preset circuit 14B, the first
to fourth output circuits 14C, 14D, 14E, 14
It is composed of F. 15 is the control circuit 13
A waveform shaping circuit 17 which is a reference signal generating means that supplies a reference signal to the CL terminal of A, and which shapes the waveform of the commercial power supply 16 (shown in a of FIG. 3) and outputs a reference signal (shown in b of FIG. 3). and a switch 18 for stopping the operation of the waveform shaping circuit 17.
The waveform shaping circuit 17 is a PNP transistor 17
A, resistors 17B and 17C, and switch 1
8 is connected in parallel to the resistor 17B. Reference numeral 19 indicates that the output of the reference signal generating means 15 is the control means 1.
A smoothing circuit 19A that determines whether or not a reference signal is input to the CL terminal of 3A outputs a smoothed signal such as C in FIG. 3 when a reference signal is input to the CL terminal; If the output of the circuit is below a predetermined level (shown by the dotted line at C in FIG. 3), an L signal is sent, and if it is above a predetermined level, an H signal is sent to the CE terminal of the control means 13A, which will be described later.
It is composed of a level judgment circuit 19B that supplies the control means. 20 controls the second control means 14 and the first control means 1 based on the output of the determination means 19.
3, the oscillation circuit 20A, the inverter 20B, the
1AND circuit 20C, 2nd AND circuit 20D and OR
It is composed of a circuit 20E. Therefore, the above
The 1AND circuit 20C is supplied with the output of the oscillation circuit 20A and the output of the level determination circuit 19B via the inverter 20B, and the second AND circuit 20D is supplied with the output of the level determination circuit 19B and the control circuit 13.
The output of the D terminal of A is given, and the OR circuit 2
The outputs of the first and second AND circuits 20C and 20D are given to 0E. 21 is the thermistor 2
2, whose output is given to the TM terminal of the control circuit 13A via the A/D conversion circuit 23. 24 is a DC power supply circuit, and 25 is a power switch.

Next, the first control means 13 will be explained in detail.
When the H signal is applied to the CE terminal, the control circuit 13A outputs the reference signal from the reference signal generating means 15 and the temperature signal from the temperature detecting means 22 to the CL terminal, TM.
Read from the terminal and read from the switching element 13B.
A signal is output from the S terminal to the switching element 13B, taking into account the ON or OFF time and the timing of turning ON. Moreover, the control circuit 13A
1 from the D terminal after the preheating, cooking, and shading processes are completed.
It is set to output pulses.

Next, the second control means 14 will be explained in detail. When a voltage is applied to the preset circuit 14B, the ring counter 14A is preset by the preset circuit 14B, drives the first output circuit 14C, and sets the output of the output circuit 14C to L. still,
At this time, the second output circuit 14D, the third output circuit 14
E and the fourth output circuit 14F are both open collector type, and the respective outputs of these circuits are all H. Next, ring counter 14A
When a pulse is given to , the second output circuit 14D is driven, and only the output of this circuit 14D becomes L,
The outputs of the other circuits 14C, 14E, and 14F become H. When the next pulse is further applied to the ring counter 14A, the third output circuit 14E is driven,
Only the output of this circuit 14E becomes L. When the next pulse is applied to the ring counter 14, the fourth output circuit 14F is driven, and only the output of this circuit 14F becomes L. Furthermore, when the next pulse is input to the ring counter 14A, the first output circuit 14C is driven, and only the output of this circuit 14C becomes L.
The same procedure will be repeated below.

Next, the operation of the electric rice cooker described above will be explained. First, when the second operation knob 12 is operated to turn off the switch 18, and the first operation knob 11 is operated to turn on the power switch 25, the waveform shaping circuit 17 transfers the reference signal to the control circuit 13A. Since it is output to the CL terminal of
A outputs a signal such as C in FIG. At this time, since this signal indicates a predetermined level or higher, the level determination circuit 19B sends the H signal to the CE terminal of the control circuit 13A.
As a result, the control circuit 13A is driven, and the output of the D terminal of the control circuit 13A is applied to the inverter 20B and the second AND circuit 20D.
It is applied to the ring counter 14A via the 2AND circuit 20D and the OR circuit 20E. Therefore, each process is executed in sequence, and during the preheating process, a current flows through the diode 10A and lights up, and then when the rice cooking, steaming, and warming processes are sequentially performed, the diodes corresponding to those processes are lit in sequence. become.

Next, operate the second operation knob 12 to switch 1.
8 to the ON state, and then turn the first operation knob 11
When the power switch 25 is turned ON by operating the transistor 17A, the emitter and base of the transistor 17A are short-circuited, so the reference signal is not output from the waveform shaping circuit 17, and the level determination circuit 19B converts the L signal to the control circuit. 13A CE terminal, inverter 20
B. will be applied to the first AND circuit 20C, and as a result, the control circuit 13A will not operate and the heater 7 will be
The OFF state is maintained, and the output of the oscillation circuit 20A is applied to the ring counter 14A via the first AND circuit 20C and the OR circuit 20E. Therefore, for example, if the oscillation cycle of the oscillation circuit 20A is set to about 5 seconds, the preheating process display,
Light emitting diodes 10A, 10B, 1 for displaying rice cooking process, steaming process display, and warming process display, respectively
0C and 10D are to be lit repeatedly in this order.

(g) Effects of the Invention As described above, the present invention can automatically select whether to drive the second control means synchronously or asynchronously with the first control means, so that cooking can be performed without heating. For example, at a store, it is possible to improve the display effect and easily explain the operation to consumers.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of the electric rice cooker of the present invention, FIG. 2 is a schematic electric circuit diagram, and a,
b and c are time charts of the main parts of FIG. 2. 13...First control means, 14...Second control means, 15...Reference signal generation means, 17...Waveform shaping circuit, 18...Switch means, 19...Determination means, 20...Third control means .

Claims (1)

[Scope of Claims] 1. A first control means for controlling cooking heating, a second control means for controlling display, a reference signal generation means for supplying a reference signal to the first control means, and a reference signal generation means for supplying a reference signal to the first control means. a determining means for determining whether an output is input to the first controlling means; and a second controlling means for driving the second controlling means synchronously or asynchronously with the first controlling means based on the output of the determining means. 3. An electric cooking appliance characterized by comprising: 3 control means. 2. Claim 1, characterized in that the reference signal generating means comprises a waveform shaping circuit that shapes the waveform of a commercial power source and outputs a reference signal, and a switch means that stops the operation of the waveform shaping circuit. Electric cooker mentioned.