JPS63166185A - 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 an electric hot plate for household use.

2. Description of the Related Art As shown in FIGS. 4a and 4b, a conventional hot plate detects the temperature of a plate 4 using a temperature detection means 2 such as a bimetal thermometer connected in series to an AC power supply 1, and mechanically connects the contacts. It is configured to open and close to control the temperature of a metal plate 4 in which a heater 3 is embedded.

Problems to be Solved by the Invention However, the above configuration has the drawback that as soon as the contacts of the bimetal thermostat are welded, if the power is connected and the switch is turned on in the event of a mechanical failure, it will continue to operate indefinitely. Was. As a result, the high temperature state persisted, and there was a risk of burns caused by unintentional touching or, in the worst case scenario, a fire. It also has the disadvantage of consuming unnecessary power forever.

In view of the above-mentioned drawbacks, the present invention provides a control device for an electric hot plate, which prevents dangers such as burns and fires by preventing the high temperature from persisting even if the user forgets to turn off the switch and leaves it unattended. It is.

Means for Solving the Problems To achieve this object, the electric hot plate control device of the present invention includes a temperature detection means for detecting the temperature of the plate, and a temperature control means for controlling the temperature at a plurality of temperature points. , a control temperature setting means that includes a control temperature setting switch that sets the control temperature, and a timer that starts timing from the time when the control operation of the temperature control means starts and resets the time every time the control temperature setting switch is pressed. a timing inhibiting means for prohibiting a timing operation, and a control operation stopping means for stopping a control operation in the temperature control means, and prohibits timing when the control temperature is the lowest, and prohibits timing at other control temperatures. , which is configured to stop operating after a certain period of time.

Effect With this configuration, the control temperature setting switch is pressed, and the temperature control means adjusts the plate temperature to a constant temperature based on the information from the temperature detection means, and at the same time, the time measurement means starts measuring time, and the control temperature is Each time the setting switch is pressed, the clock time is reset and time measurement starts. Here, when the control temperature is the lowest control temperature by the timekeeping prohibition means, the timekeeping operation by the timekeeping means is stopped. When the time measured by the time measuring means exceeds a certain period of time, that is, when no switch is pressed for a certain period of time, the control operation of the temperature control means is stopped by the control operation stopping means, and the power supply to the heater is stopped. This prevents the sibrate temperature from remaining at a dangerously 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.
1 is an AC power supply, 3 is a heater, and 5 is a relay that cuts off and on energization to the heater 3, which is composed of a contact 5a and a coil 5b, and the contact 5a is inserted into the energization circuit of the heater 3, The coil 6b is controlled by a temperature control means 7.

The temperature control means 7 performs control operations based on a signal from a temperature detection means 6 which detects the temperature of the plate, such as a negative characteristic thermistor. The temperature control means 7 also includes a start switch 8 that starts when pressed once and stops when pressed once more, a control temperature setting means 9 for setting the control temperature of the temperature control means 7, and a control operation stop means 12.
This is to give a signal. The control temperature setting means 9 is provided with a setting switch 1o for setting the temperature, and as shown in FIG. θ2. Three types of control temperatures of θ3 can be set.

Reference numeral 11 denotes a timer which starts counting time from the time when the start switch 8 is pressed, and is adapted to provide a timer signal to the control operation stopping means 12. Reference numeral 13 denotes a timekeeping prohibition means that stops the timekeeping operation of the timekeeping means 7 when the control temperature θ8 of the temperature control means 7 is the lowest control temperature θ1 (80° C.).

The operation of the electric hot plate control device configured as described above will be explained below when the control temperature θ8 is 03 in Fig. 2.
This will be explained with reference to a temperature characteristic diagram showing temperature changes of the plate when set to , and a flowchart shown in FIG. First, when the start switch 8 is pressed, the control temperature θ8 of the temperature control means is initially set to 01 (so'c) in step 101. In step 102, the process proceeds to the next step 103 only when the control temperature θ8 is other than 01.

In step 103, the clock time T in the clock means 11 is reset and time measurement is started, and in step 104, the clock time T is counted up every second.
6, if the time measurement T is less than 60 minutes, step 106
Proceeding to step 1, the temperature detection means 6 detects the plate temperature θ, and in step 107, the plate temperature θ is compared with the set control temperature θ8. If θ is less than θ8, the relay 6 is turned on in step 108, and θ≧08 If so, the relay 6 is turned off in step 109 to stop energizing the heater.

In the next step 110, it is determined whether the control temperature setting switch 1° has been pressed, and if it has not been pressed, the process returns to step 104, and the same operation follows. If it has been pressed, the process proceeds to step 111 and the current If the set control temperature θ8 is not θ3 (230'C), that is, θ8 is 0.
1 (80℃) or θ2 (180℃) Step 11
Proceed to step 2 and the control temperature is reset to a higher control temperature.

If θ8=03 in step 111, it is reset to 08=01 in step 113. After that, the process returns to step 102. In step 102, if 08 is 01 (80°C), that is, if it is the lowest control temperature, the process proceeds to step 106, and the operation at 1 osi is not performed from step 103. Therefore, if 03=θ1, The time measurement means is configured not to perform time measurement. If θ8\θ1 in step 102, the process proceeds to steps 103, 104, and 105, and if the measured time T is 60 minutes or more in step 105, the process proceeds to step 114, where the relay is turned off, the power supply to the heater is stopped, and the temperature The control operation of the control means also stops.

If the measured time T is less than 60 minutes, step 106
Then, the above-mentioned operations are repeated.

By performing the above-mentioned series of operations, even if the user forgets to turn off the switch, if the control temperature is high, the control operation will be automatically stopped and the power supply to the heater will be stopped, thereby preventing burns, fire, etc. This can prevent dangerous situations from occurring.

Effects of the Invention As is clear from the description of the embodiments above, the present invention provides a temperature detection means for detecting the temperature of a plate, a temperature control means for controlling the temperature at a plurality of temperature points, and a control performed by the temperature control means. A control temperature setting means including a control temperature setting switch for setting the temperature; and a timekeeping means that starts measuring time from the time when the control operation of the temperature control means is started and resets the time every time the control temperature setting switch is pressed. By providing a timekeeping prohibition means that prohibits the timekeeping operation of the timekeeping means and a control operation stop means that stops the control operation of the temperature control means, it is possible to prevent temperature control from occurring when the user forgets to turn off the switch. Even if the heater is left unattended, it will automatically shut off after a certain period of time, stopping power to the heater, preventing the user from getting unexpectedly burned, and preventing dangerous situations such as fire. It is. Furthermore, at the lowest controlled temperature used to keep warm after cooking, continuous use is possible regardless of time. In addition, each time the control temperature setting switch is pressed, the clock time in the clock means is reset and the clock is re-counted, so it can be used even if the temperature control is used continuously without stopping, such as changing the control temperature with the setting switch. Its effects are great, such as the fact that it can be used without stopping the control operation during operation.

[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, Fig. 2 is a plate temperature characteristic diagram, Fig. 3 is a flowchart, and Figs. 4 a and b are conventional electric hot plate controls. FIG. 2 is a circuit diagram and a configuration diagram of the device. 6... Temperature detection means, 7... Temperature control means, 9... Control temperature setting means, 11...
...Clocking means, 12... Control operation stopping means, 1
3... Means for inhibiting timekeeping. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 60' Time opening 3rd figure evening 4rlA Cb)

Claims (1)

[Claims] a temperature detection means for detecting the temperature of the plate; a temperature control means for controlling the temperature at a plurality of temperature points; and a control temperature setting means comprising a control temperature setting switch for setting the control temperature controlled by the temperature control means; A timekeeping means that starts timekeeping from the time when the control operation of the temperature control means is started and resets the timekeeping every time a control temperature setting switch is pressed, a timekeeping prohibition means that prohibits the timekeeping operation of the timekeeping means, and a temperature control means. If the control temperature set by the control temperature setting means is the lowest control temperature, the timekeeping prohibition means stops the timekeeping operation of the timekeeping means, and the control temperature setting means stops the timekeeping operation. A control device for an electric hot plate, characterized in that when the control temperature is other than the minimum control temperature, the timer starts a timekeeping operation, and when a certain period of time is counted, the temperature control operation of the temperature control means is stopped.