JPS63164190A - 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 used in general households.

Conventional technology Conventionally, in the control device of an electric hot plate, a temperature sensor detects the temperature at the bottom of the plate, and when the temperature rises to the set temperature, electricity continues to be applied to the heater until the set temperature is reached, and when the set temperature is reached. The configuration was such that the power to the heater was stopped.

Problems to be Solved by the Invention However, with the temperature control method described above, the temperature continues to rise for a while even after the power supply to the heater is stopped, so the plate temperature rises to a temperature higher than the set temperature. The higher the set temperature, the more likely the fluorine on the plate surface will be thermally degraded due to the temperature overshoot mentioned above, and therefore the maximum temperature that can be set will be a temperature that overshoots the maximum temperature that the vessel can withstand. There is a problem in that the maximum settable temperature must be lowered even though there are foods that must be cooked at as high a temperature as possible.

In view of the above problems, the present invention eliminates the excessive temperature overshoot that occurs when the plate temperature rises, and achieves two! The purpose is to improve the durability of the bare surface and raise the maximum temperature that can be set.

Means for Solving the Problem In order to achieve this object, the electric plate control device of the present invention includes a temperature detecting means for detecting the temperature of the plate, and a temperature detecting means for controlling the temperature at a plurality of temperature points. Separate means;
It is comprised of a control temperature setting means for setting the temperature controlled by the temperature control means, and a heater power reduction means for reducing the heater power.

Effect With this configuration, the temperature controlled by the temperature control means is first set by the control temperature setting means, the temperature control operation is started, and until the plate temperature reaches the control temperature, the temperature detection means sets the temperature to be controlled by the temperature control means. When it is detected that the temperature has reached a certain lower temperature, the heater power reduction means reduces the heater power at a reduction rate according to the control temperature set by the control temperature setting means.

As a result, the overshoot of the plate temperature with respect to the control temperature can be suppressed in just the right amount compared to when the current is continued until the control temperature is reached.

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

FIG. 1 is a circuit 1072 diagram showing the configuration of an embodiment of the present invention.
A series circuit of L and heater 3 is connected. The relay contact 4a is driven to open and close by a relay coil 4b, and the relay contact 4a and the relay coil 4b constitute a relay. temperature detection means 5 for detecting plate temperature;
The control temperature setting means 6, through which the user selects and sets the desired plate temperature using the control temperature selection switch 7, is input to the temperature control means 8. Note that the control temperature setting means 6 operates at θ2. Three types of control temperatures, θ5 and θ4, are selected and set.

The temperature control means 8 adjusts the temperature at the control temperature set by the control temperature setting means 6. That is, the output of the temperature detection means 6 is compared with the control temperature, and the heater power is adjusted by controlling the energization rate of the relay 4. The operation starts when the control temperature selection switch 7 is still pressed. When the temperature control means starts operating and the temperature detection means 5 detects that the temperature has reached a temperature lower than the control temperature set at that time, the heater power reduction means 9 reduces the relay energization performed by the temperature control means 8. The reduction rate is changed to a reduction rate according to the control temperature, and the electric power of the heater 3 is reduced. The heater power reduction means 9 counts the on/off signals sent to the relay 4 by the temperature control means from the time when the relay energization rate is changed and reduced, and one on/off cycle is regarded as one time, and when it counts twice, the operation is stopped. make it stop.

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, in step 101, the control temperature selection switch 6 is operated to select a desired control temperature. Here the control temperature is the second
If θ4 shown in the figure is selected, θ3 becomes the starting point of the heater power reduction means, and at the same time the temperature control operation is started, and in step 102, if the temperature θ at the start point is θ≧θ4, the plate temperature is lower than the control temperature. Because it is expensive,
Go to Ste Knob 103 and set the relay on/off cycle to 16
seconds, the relay energization rate is 0/16, that is, the relay remains off, and the process is repeated until θ θ 4.
If so, proceed to step 104 and set the relay energization rate to 16/
16, and in step 106, if the plate temperature has not reached the control temperature even once and the power has not been reduced by the heater power reduction means, the next step 106 is performed.
If not, the process returns to step 102. Proceeding to step 106, it is determined whether the plate temperature θ is a temperature at which the heater power reduction means is started, and
In the case of 3, the process returns to step knob 102, and in the case of θ≧θ3, the process proceeds to the next step 107. In step 107, counting of the number of times the relay is turned on and off is started, and at the same time, in step 108, the relay energization rate is reduced to 10/16. Next, in step 109, the relay is turned on and off N
If 2 times, the process returns to step 1o2, and the operation of setting the relay energization rate to 16/16 in step 104 and returning to step 102 via step 106 is repeated until θ≧θ. On the other hand, if N<2 in step 109, unless θ≧θ4 in step 110, step 1
Continue to reduce heater power at 0B energization rate. If θ≧θ4 in step 110, the process returns to step 102 and proceeds to step 101, where the relay energization rate is set to o/16 and energization to the heater is stopped.

Similarly, if the control temperature θ3 is set to θ3, then θ
becomes the starting temperature of the heater power reduction operation, the relay energization rate is reduced by 1Q/1e, and when the control temperature θ8 is 02, θ becomes the starting temperature of the heater power reduction operation, and the relay energization rate becomes 8/16. Reduce the amount of electricity applied to the heater.

By carrying out these operations described above, overshoot when the plate temperature rises is suppressed, and the energization to the heater is reduced at the optimum energization rate for each control temperature, so it is possible to perform control without excess or deficiency. . In addition,
By the combination of plate temperature θ and control temperature θ8,
The relay energization rate shown in FIG. 4 is changed.

Effects of the Invention As described above, by providing a heater power reduction means, the present invention can prevent excessive overshoot when the plate temperature rises, and improve the durability of the fluororesin coated on the plate surface. Furthermore, it becomes possible to raise the maximum temperature that can be set. Also, whether or not the plate has a lid, and whether the temperature is high or low,
Due to the magnitude of the power supply voltage, if you reduce the power when the plate temperature rises, the plate temperature will remain flat or drop, but by reducing the power by -the number of steps,
After a certain number of times, the maximum power is restored and the plate temperature can be raised to the control temperature.

[Brief explanation of the drawing]

Fig. 1 is a circuit 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 rise characteristic diagram during temperature control, and Fig. 3 is a diagram of a microcomputer used in the control device. The flowchart, FIG. 4, is a diagram showing relay energization rate setting. 3...Heater, 4...Relay, 6.
... Temperature detection means, 6 ... Control temperature setting means, 8 ... Temperature control means, 9 ... Temperature control means.
ter power reduction means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Time Figure 3

Claims (1)

[Claims] a plate having a heater; 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; a control temperature setting means for setting the temperature to be controlled by the temperature control means; When the temperature rises from the start of control operation until the plate temperature reaches the control temperature, from a constant temperature lower than the control temperature,
and a heater power reduction means for reducing the heater power until the control temperature is reached, and the power reduction rate performed by the heater power reduction means is the power according to the control temperature set by the control temperature setting means. A control device for an electric hot plate characterized by a reduction rate.