JPS63125222A - Electric hot plate - 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 INDUSTRIAL APPLICATION The present invention relates to an electric hot plate for general household use.

2. Description of the Related Art A conventional electric hot plate of this type includes a cooking plate on which ingredients are placed on the upper cooking surface for cooking, a heater for heating the cooking plate, and a temperature detection means for detecting the temperature of the cooking plate. By controlling the heater so that the temperature detected by this temperature detection means reaches a predetermined temperature, the user can heat the heater to a predetermined temperature without adjusting the heat. The upper surface of the cooking plate allows you to cook things such as grilling.

Problems to be Solved by the Invention However, in such a conventional configuration, if the user forgets to turn on the electric hot plate before or after cooking, the cooking plate will not be heated for a long time. As a result, there is a risk of smoke emitting when the ingredients are on the cooking plate, and the temperature of the electric hot plate itself will also rise.
There was also the risk of burning the desk, etc. on which the main unit was installed.

The present invention aims to solve these problems and provide a constant electric hot plate.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a temperature detection means for detecting the temperature of the cooking plate, and a temperature detection means when the temperature detected by the temperature detection means is lower than the first temperature. is reset, and when the temperature is high, the timer is activated and outputs an output when a predetermined time has elapsed, and the timer has no output and the temperature detected by the temperature detection means is higher than the first temperature. and a control means for energizing the heater when the temperature is below 2.

Function According to the above configuration, the cooking plate is always heated to the second temperature, but when the user cooks and places cold ingredients on the cooking plate, the temperature of the cooking plate temporarily changes. temperature decreases below the first temperature. In such a state, the timer starts measuring, and if the temperature of the cooking plate does not fall below the first temperature after the user cooks for a predetermined period of time, the timer outputs an output and the control means Stop powering the heater.

In this way, if the user does not cook for a predetermined period of time, the power to the heater is stopped, so even if the user forgets to turn off the power, the power can be turned off automatically. It is.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. FIG. 1 shows a block diagram of an electric hot plate according to an embodiment of the present invention. Reference numeral 1 denotes a cooking plate on which a user can cook grilled foods, etc. This cooking plate 1 is made of iron or aluminum. It is composed of boards etc. 2
3 is a heater that heats the cooking plate 1; 3 is a temperature detection means provided at the bottom of the cooking plate 1 and includes a thermistor element or the like for detecting the temperature of the cooking plate 1; 4 is a timer; When the temperature detected by the means 3 temporarily drops below the first temperature due to the user placing the ingredients on the cooking plate 1, the temperature is reset; otherwise, the time is measured. The information is output when a predetermined time (for example, 30 minutes) has elapsed.

Reference numeral 6 denotes a control means, and this control means 6 controls the energization of the heater 2 so that the temperature detected by the temperature detection means 3 becomes the second temperature. When there is an output from the timer 4,
The power supply to the heater 2 is stopped to prevent forgetting to turn it off.

FIG. 2 shows a circuit diagram of an electric hot grate according to an embodiment of the present invention, in which 2 is a heater for heating the cooking plate 1, 3 is a heater provided in contact with the bottom of the cooking plate, and 3 is a heater for heating the cooking plate 1; Temperature detection means consisting of a thermistor whose resistance value changes according to the temperature of 1, 6 a CPU, RO
This one-chip microcomputer 6 is a so-called one-chip microcomputer consisting of M, RAM, etc., and drives a transistor 7 and a relay 8 to control energization to the heater 2 .

Reference numeral 9 denotes a Mu/D converter, which converts the voltage corresponding to the resistance value ratio of the temperature detection means 3 and the temperature detection resistor 10 into a digital signal and outputs it to the microcomputer 6. .

The operation of the hot plate in the above embodiment will be explained based on the flowchart in FIG. 3 and the graph showing the temperature change of the cooking plate 1 in FIG. 4.

Turn on the device and start it, step 11
Then, the temperature t detected by the temperature detection means 3 is the second temperature τ2
When the temperature is low, microcontroller 6 switches to relay 8 in step 12.
is driven to energize the heater 2 and raise the temperature of the cooking plate 1. On the contrary, the temperature t of cooking grade 1 is
When the temperature is higher than the temperature T2, the current supply to the heater 2 is stopped in step 13. Steps 11, 12 and 13 above
is repeated, and the cooking plate 1 is
The energization of the heater 2 is controlled so that the temperature becomes the second temperature T2.

Next, when the temperature t of the cooking plate 1 is lower than the first temperature T2 in step 14, the timer 4 is reset in step 15. This is because when the user cooks and places the ingredients on the cooking plate 1 as shown in part B of FIG. 4, the temperature of the cooking grate 1 temporarily changes to the first temperature T.
It happens at 9 o'clock when it falls below 1.

On the other hand, when the temperature of the cooking plate 1 is higher than the first temperature T1, the timer 3 measures the time, and as shown in part C of FIG. If the temperature t of the heater 2 does not fall below the first temperature 1, the timer 3 continues to measure in step 16, and in step 17 it becomes No for a predetermined period of time.Then, in step 18, the power supply to the heater 2 is stopped. Ru.

Effects of the Invention As described above, the electric hot plate of the present invention detects that the user is not cooking based on the temperature change of the cooking plate, and stops energizing the heater if the hot plate is not used for a predetermined period of time. Therefore, even if the user forgets to turn on the electric hot plate, the power to the heater can be automatically stopped, thereby avoiding dangers such as fire. Not only that, it eliminates the need for wasting electricity, making it very convenient and extremely useful.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an electric hot plate showing an embodiment of the present invention, Fig. 2 is a circuit diagram of the electric hot plate,
FIG. 3 is a flowchart showing the operation of the electric hot plate, and FIG. 4 is a graph showing changes in temperature of the cooking plate of the electric hot plate. 1...Cooking plate, 2...Heater,
3... Temperature detection means, 4... Timer, 6... Control means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3

Claims (1)

[Claims] A cooking plate for cooking by placing ingredients on the upper cooking surface;
a heater that heats the cooking plate, a temperature detection means that detects the temperature of the cooking plate, which is reset when the temperature detected by the temperature detection means is lower than a first temperature, and activated when it is higher; a timer that outputs an output when a predetermined time has elapsed; and energizing the heater when there is no output from the timer and the temperature detected by the temperature detection means is below a second temperature that is higher than the first temperature. An electric hot plate comprising control means.