JPS6149941A - Automatic grilling appliance - Google Patents

Abstract

PURPOSE:To ensure the even quality of grilling regardless of the fluctuation of heating intensity of a cooking appliance due to the voltage fluctuation of the A/C power source or manufacturing tolerances of heater by inputting the heating intensity information of the heating means to an electrifying time determining means through a heat sensing means and a comparator means so as to select the electrifying time period according to the heating intensity. CONSTITUTION:A comparator means 3 compares the output from a heat sensing means 2 with the reference value, and makes an output. The outputs from the comparator means 3 and a grilled color setting means 4 are inputted to an electrifying time determining means 5 to determine the electrifying time period. A heating means 1 is electrified by an electrifying means 6 for the determined electrifying time period. In this manner, despite the fluctuation of heating intensity of a cooking appliance due to the voltage fluctuation of the A/C power source or manufacturing tolerances of the heater, an even quality of grilling is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is used in roasting cookers such as toaster ovens, and is used to reduce the heating power ( It concerns an automatic roasting device that always yields a constant mass despite fluctuations in power consumption.

Conventional configurations and their problems In recent years, there has been a wave of automation in cooking appliances with the ultimate goal of automatic cooking1, and they are easy to operate and can produce uniform and good results no matter who uses them. is required. Among these, automatic toaster ovens are seeing the light of day as an effective technology to ensure that the color of bread stays the same even when repeatedly toasted. In conventional toaster ovens, the roasting time is set by the user using a timer, so when repeatedly roasting, depending on the temperature rise of the device, it may be necessary to shorten the energization time. Unless the settings are reset and roasted, bread with a uniformly baked color cannot be obtained, and therefore, the settings require intuition, which is extremely inconvenient in practice. However, recently, it has become possible to obtain bread with a substantially uniform color even when the above-mentioned automatic roasting and repeated roasting are performed. However, even though this is called automatic roasting, a timer is used that can suitably shorten the time during repeated roasting, and the bread can be browned repeatedly by simply controlling the timer. It does not become uniform during roasting.

The main reason for this is fluctuations in the thermal power (power consumption) of the toaster heater due to voltage fluctuations in the AC power supply used in open toasters and manufacturing variations in the heaters. Generally, for example, it is said that the voltage fluctuation of an AC power supply varies by ±10 factors, and the rate at which this affects power consumption means that power consumption varies by ±20 factors. This difference in heating power was very large, and the difference in color of bread due to voltage fluctuations of the AC power supply was at a level that left a lot of dissatisfaction in practical terms.

Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks, and is designed to provide a device that can constantly operate a cooker despite fluctuations in the heat power (power consumption) of the cooker due to voltage fluctuations in the AC power supply, manufacturing variations in the heater, etc. The purpose is to provide an automatic roasting device that can achieve certain roasting conditions.

Structure of the Invention In order to achieve the above object, the automatic roasting apparatus of the present invention includes a heating means for heating the food to be cooked, a heat-sensitive means provided in the vicinity of the heating type means, and an output of the heat-sensitive means set to a reference value. a comparison means for comparing the browning color of the food, a browning setting means for setting the browning color of the food, an energization time determining means for determining the energization time by inputting the outputs of the comparison means and the browning setting means; The device is equipped with an energizing means for energizing the heating means for the time determined by the time determining means, and with this configuration, the thermal power (power consumption) information of the heating means is determined by the thermal means and the comparison means. Since the energization time can be set according to the input heat, a constant degree of grilling can always be achieved.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a block diagram of an automatic roasting apparatus according to an embodiment of the present invention, in which 1 is a heating means for heating the food to be cooked, etc., 2 is a heat-sensitive means; It is arranged. Reference numeral 3 denotes a comparison means, and this comparison means 3 compares the output of the heat-sensitive means 2 with a reference value and outputs the result. Reference numeral 4 denotes a browning setting means for setting the browning of the food to be cooked, and the energization time is determined by the energization time determining means 5 using the outputs of the comparison means 3 and the browning setting means 4 as inputs. The heating means 1 is energized by the energizing means 6 for the determined energizing time.

FIG. 2 shows an electric circuit diagram of an automatic roasting apparatus according to an embodiment of the present invention. Reference numeral 11 is an AC power source, and a heater 13 is connected to both ends of the AC power source through contacts 12. A series circuit of a coil 14 and a thyristor 16 is connected to the GND of the AC power source 11 from the connection point between the contact 12 and the heater 13.

15 is a thyristor, and the gate of this thyristor 15 is connected to the collector of a transistor 34, which will be described later, and a resistor 16. GND via parallel circuit of capacitor 17
It is connected to the.

On the other hand, the set voltage of the variable resistor 18 connected to both ends of the DC power supply is input to the microcomputer 32 through the A/D converter 19. In addition, the contact 12 and the heater 1 mentioned above
From the connection point of 3, G is connected via a series circuit of resistors 20 and 21.
It is connected to NDIfC and is input to the microcomputer 32 from the connection point between the resistors 20 and 21.

A series circuit of a heat sensitive element (hereinafter referred to as NTC) 22 and a resistor 23 which functions as the heat sensitive means 2, and respective series circuits of resistors 24 and 25 and resistors 26 and 27 are connected between DC power supplies, and each series circuit The voltage at the connection point is vT I V
Rl + vR2.

The voltage vT is connected to the non-inverting input terminals of comparators 28 and 29, the voltage vRl is connected to the inverting input terminal of comparator 28, and the voltage vR2 is connected to the inverting input terminal of comparator 29, respectively.

Further, the output of one comparator 28 is input to the microcomputer 32 and is connected to +vDD via the resistor 30.
The output of the other comparator 29 is input to a microcomputer 32 and is also connected to +DD via a resistor 31.

The output of the microcomputer 32 is the transistor 3
4, and the emitter of this transistor is connected to GND, and the collector is connected to the gate of the thyristor 15 as described above, and is connected to + through the resistor 33.
■Connected to DD'.

Regarding the automatic roasting device configured as above, the following is as follows.
The operation will be explained using FIG.

First, the user puts bread into the open toaster,
Set the browning color. This color setting is inputted to the microcomputer 32 through the A/D converter 19 as the output voltage of the variable resistor 18.

Next, when the user turns on a roasting start switch (not shown), the contacts 12 are closed and the heater 13 starts being energized. This start of energization is input to the microcomputer 32 via resistors 20 and 21.

With this start of energization, the temperature of the heater 13 rises, and the temperature of the NTC 22 also rises, and the voltage of VT gradually rises. Figure 3 shows this situation. For example, assuming that the voltage of VT increases to vTl (7), when VT increases and reaches the voltage of vRl, the output of the comparator 28 is inverted, and what was previously [L'J] becomes rHJ. become.

The microcomputer 32 starts timer counting from this inverted input to the microcomputer 32. When the temperature further rises and vT reaches the voltage of "R2", the output of the comparator 29 is reversed, and what was previously "L" becomes "H".

This inverted input from the microcomputer 32 stops the above-mentioned timer count.

That is, the microcomputer 32 determines the time T1 from when the voltage of vT reaches ■G to when it reaches ■R2.
is measured. - On the other hand, if, for example, the power consumption of the heater 13 and the voltage of the AC power supply 11 decreases a little and the change in the 7th column increases like VT2, the microcomputer 32 will change the voltage T2 in the same way as in the case of vTl described above. be measured.

In this way, fluctuations in the power consumption of the heater 13 are controlled by the NTC
The voltage of VT is converted to the degree of temperature rise of 22, and the voltage of VT is
The time from Rl to "R2" is converted and input to the microcomputer 32.

The time T1 mentioned above. If the baking color setting is the same from the information such as T2 and the baking color setting by the variable resistor 18 mentioned above,
The microcomputer 32 calculates and determines the energization time so that it remains constant regardless of fluctuations in the power consumption of the heater 13.

When the calculated energization time has elapsed since the start of roasting, the microcomputer 32 outputs a signal so that the transistor 34, which had been on until then, is turned off. When the transistor 34 is turned off, a signal is applied to the gate of the thyristor 15 through the circuit including the resistors 16, 33 and the capacitor 17, and the thyristor 15 becomes conductive.

Then, a current flows through the coil 14, energizing it, opening the contact 12, which had been mechanically closed, and stopping the power supply to the heater 13, thereby completing roasting.

As described above, according to this embodiment, fluctuations in the power consumption of the heater 13 are detected as changes in the temperature rise of the NTC 22,
Furthermore, the changes in the time required for the temperature to rise to a certain level are input to the microcomputer 32, and in conjunction with the input of the browning setting, the energization time is calculated and determined so that the open toaster can always obtain cooked food with a constant browning color. is controlled, and you can always get the desired brown color.

In the above example, the time required for the temperature to rise between two points was used, but the time required to reach the temperature at one point may be used, or the same effect can be obtained by increasing the temperature between multiple points. is clear.

Effects of the Invention As described above, according to the present invention, a heating means for heating the food to be cooked, a heat-sensitive means provided in the vicinity of the heating means, a comparison means for comparing the output of the heat-sensitive means with a reference value, A browning setting means for setting the browning color of the food, an energization time determining means for determining the energization time by inputting the outputs of the comparison means and the browning setting means, and a energization time determining means for determining the energization time. Since the heating means is equipped with a power supply means for supplying power to the heating means, it is always constant despite fluctuations in the cooking appliance's heating power (power consumption) due to voltage fluctuations in the AC power supply, manufacturing variations in the heater, etc. Grilling gives you the right texture.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an automatic roasting apparatus showing an embodiment of the present invention, Fig. 2 is an electric circuit diagram of the automatic roasting apparatus, and Fig. 3 is a change in voltage vT due to NTC in the automatic roasting apparatus. This is a time chart showing the following. 1... Heating means, 2... Heat sensitive means, 3
... Comparison means, 4... Burning setting means,
5... Energization time determining means, 6... Energization means, 32... Microcomputer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 5 - Figure 3 T+ Tz

Claims (1)

[Claims] A heating means for heating the food, a heat sensitive means provided near the heating means, a comparison means for comparing the output of the heat sensitive means with a reference value, and a browning means for setting the browning of the food. a setting means; an energization time determining means for determining the energization time by inputting the outputs of the comparison means and the browning setting means;
An automatic roasting device comprising an energizing means for energizing the heating means for a time determined by the energizing time determining means.