JPS6345782A - Temperature controller of electric hot plate - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Public Expenses for Industrial Use] The present invention relates to a temperature control device for an electric stove that controls the amount of electricity applied to a heater, and in particular to a temperature control device for controlling the amount of electricity applied to the heater until it reaches a set temperature. [Prior art] Fig. 4 is a plan view of an electric stove, and in the figure, 1
1 is a spiral sheathed heater, 2 is a temperature sensor that detects the temperature at the bottom of the cooker placed on the electric stove, 3 is a manual temperature setting knob that adjusts the amount of heat generated by the sheath and 1, and 4 is a power source. It's a switch.

In such an electric stove 7, energization of the sheathed heater 1 is started by inputting the power switch 4, and energization is continued until the temperature set by the temperature setting input knob 3 is reached.

At this time, the temperature sensor 2 constantly detects the temperature at the bottom of the cooking device, and the energization of the sheathed heater 1 is controlled to a set temperature based on the detection signal of the temperature sensor 2.

Therefore, you can input the temperature required for various types of cooking! By selecting 3, the amount of heat generated by the sheathed heater 1 is controlled.

[Problem that the invention seeks to solve]

However, with conventional electric stoves, heating is performed using maximum power to the set temperature set on each scale of the temperature setting input knob 3, and this causes the cooking temperature to always exceed the set temperature by seconds, causing a so-called overshoot. There was a problem.

Furthermore, depending on the size of the contents in the cooker, even if the set temperature is the same, the temperature and humidity may vary, making it impossible to always provide a constant cooking temperature.

Therefore, in the past, it was necessary to empirically change the temperature setting knob 3 depending on the contents. For example, when there is little content, when the temperature reaches a certain level, the temperature setting knob 3 must be changed empirically.
There was the inconvenience of having to lower the value by one scale.

This invention requires [1! This was done to solve the problem, and the temperature is 11 to ensure the correct set temperature! ! C,
Another object of the present invention is to obtain a temperature control device for an electric heater in which the cooking temperature does not change depending on the size of the contents.

[Means for solving problems]

The temperature control device for an electric stove according to the present invention includes an FI adjustment area provided in the steel at a temperature lower than the set temperature, a maximum power supply means that outputs a predetermined amount of heat until the adjustment temperature area B, and a maximum power supply means that outputs a predetermined amount of heat until the adjustment temperature area B is reached. , depending on the size of the contents of the cooker.
It is provided with partial energization means that outputs an amount of heat below a predetermined value.

[Effect]

According to the configuration of the present invention, a predetermined maximum power is applied to the seventh heater until the temperature at the bottom of the cooker reaches the adjustment temperature range,
In the Wll area, the size of the contents is determined, and depending on the size, the heater is partially energized at a percentage of the maximum power, and the cooker is heated with a gentle heat.

Therefore, when the temperature at the bottom of the cooker reaches the set f-temperature and the electricity is turned off, the temperature rise above the set temperature is suppressed, and cooking can be performed at the accurate set temperature.

〔Example〕

FIG. 1 is a circuit diagram showing one embodiment of the present invention.
4 is the same as the conventional device.

In the figure, 5 is a heat sensitive element, 8 is a microphone computer, and includes maximum power energization means and partial energization means, which are characteristic components of the present invention.

Then, the detection signal of the temperature sensor 2 is inputted, and the set temperature signal of the temperature setting input knob 3 is also inputted.

8 is a transistor, and 8 is an optical coupler. The transistor OFF is turned on and off based on the control signal output from the microcomputer 6, thereby operating the photocoupler 8 and controlling the energization of the sheathed heater 1. ing.

Day is the 00g source, 10 is the thyristor that performs rectification, 11
is a commercial power source.

The embodiment has the above configuration, and is shown in FIG.

The operation will be explained based on FIG.

No. 21523 is a graph showing the energization state to the sheathed heater.
If d has a lot of content (example 1.51 or more), c is b and d
Indicates each energization control state in the case of intermediate contents,
Further, FIG. 3 is a flowchart showing the operation of the microcomputer 8.

First, in step 12, a set temperature T is set using the temperature setting input knob 3, and when the power switch 4 is turned on, temperature detection is performed in step 13, and the temperature T,
is detected.

Next, in step 14, it is determined whether the detected temperature T1 is higher than the set temperature T. If T≦T1, the process moves to step 19, but if T>T1, the process moves to step 15.

In step 15, the rA drying degree T is determined from the set temperature T.

It is determined whether the detected temperature T1 is greater than T - T yo, and if T Tz<Tz, step 1B
Then, the process moves to (a) route control shown in FIG. 2a.

In step 16, the heating power is adjusted to the maximum power (to output a predetermined amount of heat) of each scale on the furniture setting knob 3, for example 4.
0% power is applied to the sheathed heater 1 to heat the cooker with a gentle heat generation curve as shown in FIG. 2a.

Then, while continuing this partial energization, temperature detection is further performed in step 1F, and when temperature T8 is detected, the process moves to step 18.

In step 18, it is determined whether the detected temperature T is larger than the set temperature T, and if T≧T, step 1
Returning to B, if it is TNTs, proceed to step 19.

Moreover, if T-'r*≧T1 in step 15, the process moves to step 22 and the heating power is maximized.

After the power is maximized, the process proceeds to step 23 of detecting the temperature, and then step 2 of determining whether or not the detected temperature T is within the adjustment temperature range.
Move to 4.

In this step 24, the temperature at the bottom of the cooker is adjusted! 18i
The state where the degree region is not reached, that is, T-T, ≧T.

If so, return to step 22 and proceed to step 9, where the temperature has entered the adjustment temperature range, and if it is T snow < Ts, then the step is to determine the size of the contents and to make partial energization appropriate for each stage. 25.

In this step 25, the time H1 from T-T to T-T4 is measured, and in step 26, if H1≦HA (predetermined time value), control of the route shown in FIG. After the heating power is partially energized to 0% in step 27, temperature detection is further performed in step 28, temperature T is detected, and the process proceeds to step 29.

In step 29, it is determined whether the detected temperature T is larger than the set temperature T, and if T≧T, step 2
7, and if T is 7%, move to step 1.

If H,>HA in step 26, the process moves to step 30, and if H1≦HB (predetermined time value), the process moves to the (C) route shown in FIG. 2C, and in step 31 the heating After partially energizing the power to D%, temperature is further detected in step 32, temperature T6 is detected, and step 33 is performed.
to move to.

In step 33, it is determined whether the detected temperature T is larger than the set temperature T, and if T≧T@, step 3
Returning to step 1, if T<T, the process moves to step 19.

If Hs>HA in step 30, the control shifts to route (2) shown in FIG. Detection is performed to detect temperature T7, and the process moves to step 3G.

In step 36, it is determined whether the detected temperature T7 is higher than the set temperature T, and if T≧T7, step 34
Returning to step 19, if T<T, the process moves to step 19.

In this state, the bottom temperature of the cooker has reached the set temperature T, so in step 19, the heating power is set to 0. Then, temperature is further detected in step 20, and it is determined in step 21 whether or not the detected temperature T is larger than the set temperature T.
Judgment will be made.

In step 21, control is performed to maintain the bottom temperature of the cooker at the set temperature.If the temperature is TNT, step 18
, and start energizing the belly part. Also, T≦T
, the process moves to step 19 and the heating power is set to O. The control cycle of B continues until the power switch 4 is turned off.

〔Effect of the invention〕

As explained above, this invention provides an adjustment temperature range, and when it enters this adjustment temperature range, the cooking temperature is adjusted by determining the size of the contents and reducing the heating power for Tanabata to perform partial energization. It is possible to prevent overheating and cook at an accurate set temperature. Further, it is possible to perform good cooking at the set temperature regardless of the size of the contents to be cooked, and it is possible to further improve the accuracy of temperature control of the heater. moreover,
By partially energizing in the cooking temperature range, residual heat of the heater can be used effectively, and there is also the advantage that wasted heating power can be eliminated.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the temperature control device for an electric stove according to the present invention, FIG. 2 is a graph showing the energization state to the heater, and FIG. 3 is a flow chart showing the control operation of the invention. FIG. 4 is a plan view of a conventional electric stove. In the figure, 1 is a sheathed heater, 2 is a temperature sensor, and 6 is a sheathed heater.
is a microcomputer including maximum power supply means and partial power supply means. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa (2 others) O1 diagram! : Laser Hi-9 2: Shit et al., Fin 5-5r, b, 2. 1, a"6: My flow control upper 0 knee 9 1O: Ding Ilister n: #J use electric power 2 Diagram revision: li) Root advantage A au P b 2 -) Root cheap 1sP C° (c) Route Tori Misaki d: (d) root + 1 clam r → 3rd

Claims (2)

[Claims] (1) In a temperature control device for an electric stove that detects the temperature at the bottom of the cooker and controls the amount of electricity supplied to the heater, an adjustment temperature range is provided in the temperature steel that is lower than the set temperature, and until this adjustment temperature range is reached, Maximum power energization means that outputs the maximum power that outputs the amount of heat, measures the time it takes to pass between a predetermined temperature within the adjusted temperature range, and uses the time to energize the heater from the predetermined temperature.The amount of heat determined by the measured time A temperature control device for an electric stove, characterized in that it is equipped with partial energization means for performing partial energization to output . (2) The temperature control device for an electric stove as set forth in claim (1), wherein the maximum power energization means and the partial energization means are realized by a microcomputer.