JPS63164184A - Electric hot plate controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for an electric hot plate for general household use.

2. Description of the Related Art As shown in FIG. 3, a conventional electric hot plate has a structure in which the temperature of a sieve plate 4 is detected by a temperature detection means 2, such as a bimetal thermostat, connected in series to an AC power source 1, and the contacts are connected mechanically. The heater 30 is opened and closed to control the energization of the heater 30, thereby controlling the temperature of the metal plate 4 in which the heater 3 is embedded.

Problems to be Solved by the Invention However, with the above configuration, there was a problem that the device would continue to operate indefinitely unless the user turned off the power and the power was turned on and left unattended. . Therefore, if a high temperature condition were to occur, and if the user unknowingly touched it and suffered a burn, there was a risk of a fire occurring in the worst case scenario. There is also the problem that unnecessary power is consumed forever.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to prevent dangers such as burns and fires by preventing the high temperature state from persisting even if the user forgets to turn off the switch and leaves it unattended.

Means for Solving the Problems To achieve this object, the electric hot plate control device of the present invention includes a power control element for controlling energization of the heater, and a power control element control means for controlling the power control element. ,
The power control element control means includes a setting switch that sets a control mode of the power control element control means, and a timer that starts measuring when the setting switch is pressed, and the power control element control means controls the power when the timer measures a certain period of time. This is to stop the control operation of the means.

Effect With this configuration, when the setting switch is pressed, the timer is reset and time measurement starts, and if the timer measures time for more than a certain period of time, that is, the settings have not been changed for more than a certain period of time since the last time the setting switch was pressed. If there wasn't,
The control operation of the power control element is stopped, and the power supply to the heater is stopped.

This can prevent the plate temperature from being maintained at a high temperature.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
The heater 3 is connected to the AC power source 1 via a relay contact 6a of a relay 5, which is a power control element. Further, the relay 5 has a relay coil 5b, and by energizing this relay coil 6b, the relay contact 5& is brought into a closed state. A temperature detection element 6 such as a negative characteristic thermistor detects the temperature of the plate in which the heater 3 is embedded. A power control element control means (hereinafter referred to as relay control means) which inputs the output of the temperature detection element 7 controls the opening/closing operation of the relay 5 based on the signal from the temperature detection element e, and controls the temperature of the plate. be controlled at a constant level.

A start switch 8 for starting the operation of the relay control means 7 and a control temperature setting switch 9 for setting the control temperature θ8 in the relay control means 7 are provided, and in this embodiment, θ is set to 80.
Two types of control temperatures can be set: 'C and 08=230'C. The timer 10 resets the time T being measured each time the start switch 8 or the control temperature setting switch 9 is pressed, and starts timing.

The operation of the electric hot plate control device configured as described above will be explained below with reference to the flowchart shown in FIG.

First, when the start switch 8 is pressed, the control temperature θ in the relay control means 7 is initially set to 80'C, but then in step 102 the time T in the timer 1o is reset and time measurement is started, and the process proceeds to step 103. move on.

In step 103, if the time T measured by the timer 1o is less than 60 minutes, the process proceeds to step 104, where the temperature detection element 6 detects the plate temperature θ, and in step 106, the plate temperature θ is set to a control temperature θ8. If θ is less than θ8, the relay is turned on in step 106,
If θ≧8, the process advances to step 1o7 and the relay is turned off to stop energizing the heater. After that, the process proceeds to step 108, and the timer 100 time T is counted up every second. In step 109, it is determined whether or not the control temperature setting switch 9 has been pressed. If it has not been pressed, step 1
Return to 03 and repeat the same operation. If it has been pressed, the control temperature B is set to 230'C in step 110, the process returns to step 102, the time T of the timer 10 is reset, and timekeeping starts again. After that, the process advances to step 103. In step 103, if the time T has been measured for eo minutes or more, the process proceeds to step 111, where the relay is turned off regardless of the level of the plate temperature, and the relay control operation is stopped.

If the time T is less than 6 minutes, proceed to step 104;
The above-mentioned operations will be repeated below.By performing these operations, even if the user forgets to turn off the switch, it will automatically turn off and stop supplying electricity to the heater, reducing the risk of burns or fire. It can be prevented.

Effects of the Invention As described above, the present invention automatically turns off after a certain period of time even if the user forgets to turn it off and leaves it unattended, thereby preventing the user from getting unexpectedly burned and preventing dangerous situations such as fire outbreaks. It is also possible to prevent this situation from occurring. In addition, by re-clocking when the control mode is changed, such as when the control temperature setting switch is pressed, it is possible to distinguish whether the device is in use or has been left unattended due to forgetting to turn it off. This prevents it from breaking during use.

Furthermore, wasteful power consumption can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control device for an electric hot plate according to an embodiment of the present invention, and FIG. 2 is a flowchart of the same.
FIG. 3 is a block diagram of a conventional electric hot plate control device. 6...Power control element (relay), 7...
・Power control element control means (relay control means), 10...
...Timekeeping means. Name of agent: Patent attorney Toshio Nakao and one other person - □ Figure 2 Figure 3

Claims (1)

[Claims] A power control element that controls energization to the heater, a power control element control means that controls the power control element, a setting switch that sets the control mode of the power control element control means, and a timer when the setting switch is pressed. A control device for an electric hot plate, characterized in that the power control element control means stops the control operation in the power control element control means when the time measurement means measures a certain period of time.