JPH026418B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heating cooking device which is equipped with energy saving measures and safety functions in the field of heating cooking devices.

Conventional Structure and Problems Sheathed heaters are used because the heating element of a heating cooker such as a microwave oven is required to withstand impact from a pot or the like on which it is placed and to have a long life. However, since this sheathed heater does not become red hot when energized at low power, it is difficult to tell the energization status, and in conventional cooking devices such as electric ranges, it is often forgotten to turn it off. Therefore, there is a risk of burns, etc.
If a pot was used for a long time with oil or the like in it, or if it was forgotten to turn it off, it would inevitably catch fire and be dangerous.

Purpose of the Invention The purpose of the present invention is to have a function that automatically stops the power to the heating element when the power is turned on for more than a predetermined time, and prevents the power from being turned on again unless the user consciously operates it. To provide a user-friendly, energy-saving and safe heating cooker that can be re-energized with a simple operation when energized.

Structure of the Invention The heating cooker of the present invention has a sheathed heater that heats a cooking container such as a pot, and an energization ratio setting means that includes a variable resistor or the like that can be arbitrarily set. energization ratio determining means for determining an energization ratio using a set value as an input signal;
A heating element energization amount control means that controls the energization amount based on the energization ratio, a timer that counts the energization time when the energization ratio is not zero, and clears the counted value when the energization ratio is zero, and a timer that counts the energization time after the energization is energized. When the value exceeds a predetermined value, the heating element energization amount control means stops the energization. Thereafter, the power will not be re-energized unless the user first sets the set value to zero using the energization ratio setting means and clears the set value of the timer, and re-energization is possible only after the set value is set to zero.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an example of the configuration of a control device, which is made up of a microcomputer 1 and peripheral circuits. The microcomputer 1 shown here is
It is a so-called one-chip microcomputer consisting of a CPU, ROM, RAM, input/output ports, etc. When the main switch 3 connected to the AC power supply 2 is closed, a DC power supply is generated by the DC power supply circuit 4, and the microcomputer 1 begins to operate.

An energization ratio setting means 4 is constituted by a resistor 5 and a variable resistor 6 connected in series to this DC power supply. The potential at the connection point between the resistor 5 and the variable resistor 6 serves as the energization ratio setting value, and is connected to the input port of the microcomputer 1 via the A/D converter 7. As a result, the energization ratio setting value set by the user using the variable resistor 6 is converted into a binary code and read into the microcomputer 1.

A three-terminal bidirectional thyristor 8 and a heating element 9 are connected in series to the AC power supply 2 via the main switch 3, and the three-terminal bidirectional thyristor 8 is connected to the transistor 1 from the DC power supply formed by the DC power supply circuit 4.
The configuration is such that the gate current flows through 0.

The transistor 10 is activated by the current conduction ratio control signal from the output port of the microcomputer 1, and a gate current flows to conduct the three-terminal bidirectional thyristor. This energization ratio control signal is such that when the microcomputer 1 determines that the energization time has exceeded a predetermined time, it issues an "off" signal, stops driving the three-terminal bidirectional thyristor 8, and stops energizing the heating element 9. It is composed of

FIG. 2 is a front view of an electric range as an example of a heating cooker. A knob 11 connected to the shaft of the variable resistor 6 and a main switch 3 are provided on the front panel 12. The position of this knob 11 determines the resistance value of the variable resistor 6, the energization ratio is determined, and the configuration is such that the energization of the heating element 9 by the sheathed heater provided on the upper top plate 14 is controlled.

Next, the operation of the electric range constructed as described above will be explained according to the flowchart shown in FIG. When the main switch 3 is closed, the program shown in the flowchart of FIG. 3 stored in the ROM in the microcomputer 1 starts.

First, in a step, it is determined whether energization is set by the variable resistor 6, and if it is determined that energization is set, energization is started to the heating element 9 according to the energization ratio set in the step. When energization starts, a timer counts the energization time in a step. The count value t of the timer reaches a predetermined value in step
When smaller than to, step, step,
Repeat the series of steps and continue counting on the timer. Timer count value t in step
When the value exceeds a predetermined value to, the process moves to a step where the power supply to the heating element 9 is stopped. When moving from step to step, the variable resistor 6 again judges whether the energization is set to zero as in the step, and if the set value is not zero, the step is repeated and waits until the set value becomes zero. . At this time, the position 13 of the knob 11 of the variable resistor 6 shown in FIG.
continues to indicate energization, and the heating element 11 is not energized. When the user notices this state of forgetting to turn it off and wants to cancel this state, he/she has only to temporarily return the knob 11 of the variable resistor 6 to zero. When the set value becomes zero in the step, the process returns to the start step, and it is determined that there is no input in the step, so the power to the heating element is stopped again in the step, and the count value of the timer that counts the energization time is calculated in the step. Clear and return to initial state.
At this time, the process repeats step, step, step, waiting for the next energization setting, and when the energization setting is made again, the operation described above is repeated.

Note that the predetermined value t ₀ mentioned above is a value that should be set for each device, and in the case of an electric range, it is a time that is considered to cause no inconvenience to cooking even if the electricity is stopped during normal cooking. , is set to approximately 1 hour. If this value is too long, the energy saving safety function will deteriorate.

Effects of the Invention As is clear from the above explanation, the heating cooker of the present invention has an energy-saving and safety feature that prevents forgetting to turn it off, and automatically turns off the power to the heating element when the power is turned on for a predetermined period of time or longer. stop. In addition, in order to re-energize, the knob of the variable resistor for setting the energization ratio is reset to zero, so it is as easy to use as the conventional device, but has added energy-saving and safety functions.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram of an electric range showing an embodiment of the present invention, FIG. 2 is a front view of the same electric range, and FIG. 3 is a flowchart showing an example of a program for the same electric range. 1... Microcomputer, 8... Three-terminal bidirectional thyristor, 9... Heating element, 14... Energization ratio setting means.

Claims (1)

[Claims] 1. A heating element that heats a cooking container such as a pot, an energization ratio setting means that can be arbitrarily set, and an energization ratio determining means that determines the energization ratio using a setting value set by the energization ratio setting means as an input signal; A heating element energization amount control means for controlling the amount of energization based on a control signal from the energization ratio determining means, and counting the energization time when the energization ratio determined by the energization ratio determination means is not zero; and a timer that clears a counted value and outputs an output to the heating element energization amount control means to stop energizing the heating element when the counted value exceeds a predetermined value.