JPH0749861B2 - Microwave cooking method with toaster function - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heating method for a microwave oven with a toaster function in which heating heaters are provided so as to face each other vertically.

<Prior art> In a microwave oven with a toaster function, which is provided with heating heaters facing each other vertically, for example, when toasting bread by the toaster function, the bread is placed horizontally on a metal tray. The pan is placed in the refrigerator, and the upper and lower surfaces of the pan are heated by the upper heater and the lower heater. Normally, when bread is toasted, the tray is not heated, so even if the upper and lower heaters are continuously heated equally, the upper and lower surfaces of the bread are almost even and almost the same. Toasted. However, when toasting bread continuously, the metal tray on which the bread is placed is in a heated state due to the previous use, and moreover, the tray is used continuously while heat is not dissipated. The bottom of the bread in contact with the tray was affected by the residual heat of the tray and was overbaked, resulting in a blackened char.

Therefore, when continuously toasting bread, the temperature inside the refrigerator is measured during the second and subsequent toasts, and the heating time by the upper and lower heaters is reduced equally depending on the residual heat of the tray at that time. A method of preventing the bottom surface of the bread from being toasted too much.

<Problems to be Solved by the Invention> However, in this way, in the method of toasting by equally reducing the energization time to both the upper and lower heaters, if the lower surface of the pan in contact with the tray is adjusted to a good toast,
The top surface of the bread is not well toasted for a good browning. Moreover, if the bread and toast are continuously toasted three times or more, residual heat is further accumulated on the tray, so if the bread top surface is well toasted,
The bottom surface in contact with the tray is too charred. Thus, it is not easy to toast both the upper and lower sides of the bread in a substantially equal and good condition.

The present invention solves the above-mentioned conventional drawbacks, and an object thereof is to provide a heating cooking method capable of toasting both sides of a bread in a good state when the bread is toasted in a microwave oven with a toaster function. To do.

<Means for Solving the Problems> A heating and cooking method for a microwave oven with a toaster function according to the present invention is a heating and cooking method for a microwave oven with a toaster function, which has upper and lower heaters arranged to face each other. , The step of continuously energizing the upper heater and the lower heater at the same time as the start of cooking, the step of measuring the temperature inside the chamber at a certain time after the start of energization, and the upper heater and the lower heater with respect to the measured chamber temperature And a step of controlling so that the respective energization times are preset so that the above object can be achieved.

<Operation> In the heating and cooking method of the present invention, at the same time as the start of cooking, the upper heater and the lower heater are energized to heat the inside of the refrigerator. Then, after a lapse of a predetermined time, the temperature inside the refrigerator is measured, and the upper heater and the lower heater are set so that the heating time is preset for the measured inside temperature to be in a good heating state. Are controlled respectively.

<Example> Hereinafter, an example of the present invention is described based on a drawing. FIG. 1 is a schematic view of a microwave oven with a toaster function used for carrying out the method of the present invention. As shown in FIG. 1, the upper heater 2 is arranged at the upper center of the oven 16, and the lower heater 3 is arranged directly below the upper heater 2 so as to face the upper heater 2. The thermistor 4 for measuring the temperature inside the oven is attached to the oven 16.

FIG. 2 is an electric circuit diagram of the microwave oven. As shown in FIG. 2, a series circuit of an oven lamp 12 and an oven lamp relay 13 provided on the control board 7 is connected between both terminals of the power plug 1. A series circuit of a latch switch 5, a turntable motor 10, and a turntable relay 11 on the control board 7 is also connected between both terminals of the power plug 1. And the connection part of the latch switch 5 and the turntable motor 10,
A fan motor 14 is connected between the oven lamp 12 and the connection portion of the oven lamp relay 13.

Connection of fan motor 14 and latch switch 5,
A series circuit of the door switch 6, the lower heater 3, and the lower heater relay 9 provided on the control board 7 is connected between the fan motor 14 and the connection portion of the oven lamp 12. Further, a series circuit of the heater 2 and the upper heater relay 8 is connected between both ends of the series circuit of the lower heater 3 and the lower heater relay 9. The thermistor 4 provided in the oven 16 is connected to the CPU 15 provided on the control board 7 so that the internal temperature detected by the thermistor 4 is input to the CPU 15 as temperature information and A / D converted. It has become.

The energization time to the upper heater 2 and the lower heater 3 is
The program is controlled by the CPU 15.

In such a microwave oven, when the bread was continuously toasted, the heating time of each heater was obtained experimentally so that a constant brown mark was obtained on the upper and lower surfaces of the bread, and FIG. 3 (a). The results shown in and (b) were obtained. FIG. 3 (a) shows the continuous heating time of the upper heater 2 with which the upper and lower surfaces of the bread are uniformly browned, with respect to the temperature inside the refrigerator, and FIG. 3 (b) shows
The heating time of the lower heater 3 in that case is shown with respect to the internal temperature.

In order to form a good brown mark on the upper surface of the bread, the upper heater 2 has a temperature inside the refrigerator of 50% as shown in FIG. 3 (a).
If the temperature is lower than ℃ (= T ₁ ), the surrounding equipment in the storage will absorb the heat, which requires a long time of 210 seconds (3 minutes and 30 seconds). When the temperature rises to 1, the heating time by the upper heater 2 decreases in inverse proportion, and when the temperature inside the chamber becomes 200 ° C. (= T ₂ ) or higher, the heating time by the upper heater 2 becomes 160 seconds. When the temperature in the refrigerator is 200 ° C or higher, if the heating time of the upper heater 2 is set to be shorter than 160 seconds, good browning will not be formed on the upper surface of the bread, so a certain time of 160 seconds is required. .

On the other hand, in order to form a good brown mark on the lower surface of the pan, the lower heater 3 is used when the temperature inside the refrigerator is lower than 50 ° C (= T ₁ ) as shown in Fig. 3 (b). In this case, the equipment around the inside absorbs heat, so as with the upper heater 2, a long time of 210 seconds (3 minutes 30 seconds) is required.
As the internal temperature rises, the heating time of the lower heater 3 decreases in inverse proportion. In this case, lower heater 3
The rate of shortening the heating time is higher than the rate of shortening the heating time of the upper heater 2. When the temperature inside the refrigerator reaches 200 ° C. or higher, the heating time of 135 seconds, which is shorter than the heating time by the upper heater 2, is sufficient. The internal temperature is 2
If the temperature is over 00 ℃, set the heating time of the lower heater 3 to 135
If the time is shorter than a second, a good browning is not formed on the lower surface of the pan, and thus a fixed time of 135 seconds is required.

Based on such experimental results, the heating time of the upper heater 2 and the lower heater 3 with respect to the internal temperature is set in advance.

Based on such experimental results, the heating time of the upper heater 2 and the lower heater 3 with respect to the internal temperature is set in advance. In this case, the upper heater 2 continuously heats the inside of the refrigerator, and the continuous heating time of the upper heater 2 is changed based on the inside temperature. On the other hand, the lower heater 3 is configured to heat the inside of the refrigerator continuously or intermittently at a cycle of 32 seconds while the upper heater 2 is continuously heating,
The heating time (on time) within a cycle of 32 seconds is changed based on the internal temperature.

The continuous heating time by the upper heater 2 is set based on the graph shown in FIG. 3 (a), and the heating time by the lower heater 3 is set based on the graph shown in FIG. 3 (b). ing.

That is, assuming that the temperature inside the chamber detected by the thermistor 4 is Temp, the continuous heating time by the upper heater 2 is 210 seconds (3 minutes 30 seconds) when the temperature inside the chamber Temp is less than 50 ° C. (= T ₁ ). ) Is set to a constant value. In addition, the internal temperature Te
160 seconds (2 minutes 40 seconds) when mp is over 200 ℃ (= T ₂ ).
Is set to a constant value. And the temperature inside the chamber is 50 ℃ or higher 20
If the temperature is below 0 ° C (T ₁ ≤ Temp <T ₂ ), the upper heater 2
The heating time of is set to be short in inverse proportion to the rise in the internal temperature. In other words, heating time at the chamber temperature of 50 ℃ 210
Assuming that the second and the heating time of 160 seconds at the inside temperature of 200 ° C. are shortened in inverse proportion to the increase of the inside temperature, the setting heating time Tc of the upper heater 2 when the inside temperature rises by 1 ° C. The heating time Tc of the upper heater 2 is set by the following equation so that is reduced by 1/3 second.

Tc = 3′30 ″ − (Temp−T ₁ ) × 1/3 (1) As mentioned above, the heating time of the lower heater 3 is that of the upper heater 2 when the temperature inside the chamber is 200 ° C. The heating time is 160 seconds, while 135 seconds is sufficient, and the temperature inside the chamber is 50
In the range of ℃ ~ 200 ℃, as the internal temperature rises,
The heating time of the upper heater 2 is shortened at a higher rate than when it is shortened. For this reason, the inside of the cabinet is the upper heater 2
The lower heater 3 repeats heating and heating stop at regular intervals so that the lower heater 3 heats the inside of the refrigerator evenly during the period of being heated by.

That is, the heating time of the upper heater 2 is 160 seconds when the inside temperature is 200 ° C., while the heating time of the lower heater 3 is 135 seconds. In this case, the heating of the upper heater 2 and the lower heater 3 is performed. The time ratio will be 32:27. Therefore, when the internal temperature of the lower heater 3 is 200 ° C, the heating time is set so that the upper heater 2 is intermittently heated at a ratio of 32:27 while being continuously heated for 160 seconds. It That is, the energization time (ON time) Ton of the lower heater 3 is set so that the heating time is 27 seconds in a cycle of 32 seconds. As a result, the lower heater 3
Alternately repeats heating for 27 seconds and stopping heating for 5 seconds for 160 seconds.

When the temperature inside the chamber is 50 ° C or more and less than 200 ° C (T ₁ ≤Temp <T ₂ ), the heating time of the lower heater 3 in the cycle of 32 seconds is set to be short in inverse proportion to the rise in the temperature inside the chamber. Cage,
The heating time Ton of the lower heater 3 is shortened by 1/30 seconds each time the temperature inside the chamber rises by 1 ° C. 50 ° C inside temperature
In the following cases, the lower heater 3 is continuously heated for 210 seconds like the upper heater 2.

Therefore, the heating time of the lower heater 3 is set by the following equation.

Ton = 32 ″ − (Temp−T ₁ ) × 1/30 (2) The operation of continuously toasting bread by the microwave oven having such a configuration will be described with reference to the flowchart of FIG.

To toast the bread, the bread is placed on a metal tray, placed on a turntable in the cabinet, and the oven door is closed. As a result, both the latch switch 5 and the door switch 6 are turned on. When the toast key is pressed in such a state, the upper heater relay 8, the lower heater relay 9, the oven lamp relay 11, and the turntable relay 13 are turned on, and the upper heater 2 and the lower heater 3 are energized. When heating is started, the oven lamp 12 is turned on to notify that the inside of the refrigerator is in a heated state. Further, the turntable motor 10 is driven to rotate the turntable.

In this way, when the heating of the inside of the refrigerator is started and, for example, 1 minute has passed, the temperature Temp of the inside of the refrigerator is measured by the thermistor 4. The measurement data of the thermistor 4 is input to the CPU 15, A / D converted, and processed as a signal. Then, the temperature Temp inside the chamber detected by the thermistor 4 is 50 ° C (=
When it is lower than T ₁ ), the continuous heating time Tc of the upper heater 2 is set to 3 minutes and 30 seconds (= 210 seconds), and the upper heater 2 is continuously energized for the heating time. At this time, the lower heater 3 has an on time To within a 32-second cycle.
n is set to 32 seconds.

Therefore, the upper heater 2 is continuously energized for 3 minutes and 30 seconds to heat the inside of the refrigerator, and the lower heater 3 also
The upper heater 2 is continuously heated for 3 minutes and 30 seconds. As a result, the bread placed on the metal tray in the refrigerator is toasted with good brownness on both the upper surface and the lower surface.

When the internal temperature Temp is 50 ° C or higher and lower than 200 ° C (T ₁ ≤ Temp <T ₂ ), the heating time Tc of the upper heater 2 is set by the above-mentioned equation (1) and the lower heater 3
The on-time Ton within the 32-second cycle is also set by the above-described equation (2).

Therefore, while the upper heater 2 continuously heats the interior of the chamber for the set time Tc, the lower heater 3 is turned on for a predetermined on time Ton during the continuous heating time Tc of the upper heater 2. The intermittent heating that is turned off is repeated in a cycle of 32 seconds.

When the internal temperature Temp is 200 ° C. (= T ₂ ) or more, the heating time Tc of the upper heater 2 is set to 160 seconds (= 2 minutes 40 seconds) and the lower heater 3 within the 32 second cycle. On time
Ton is set to 27 seconds.

Therefore, while the upper heater 2 continuously heats the inside of the chamber for the set 160 seconds, the lower heater 3 is turned on for 27 seconds during 160 seconds which is the continuous heating time of the upper heater 2, The intermittent heating that is turned off for 5 seconds is repeated in a cycle of 32 seconds.

In this way, since the heating time of the upper heater 2 and the lower heater 3 is controlled based on the temperature Temp in the refrigerator, the bread placed on the tray in the refrigerator has a good scorching condition on both the upper surface and the lower surface. Is toasted.

<Effects of the Invention> In this way, the heating and cooking method of the present invention, based on the temperature inside the chamber at the time when a predetermined time has elapsed from the start of heating, the upper heater and the lower heater are set to the measured chamber temperature. Since the heating time is set to each preset time, the effect of the residual heat of the tray on which the bread is placed is eliminated even when the bread is continuously toasted. Thus, both sides of the bread can be toasted in a good charred state. In addition, since the residual heat of the tray is used for toasting, power consumption is saved and economic efficiency is improved.

[Brief description of drawings]

Fig. 1 is a schematic view of a microwave oven with a toaster function, Fig. 2 is an electric circuit diagram of the microwave oven, and Fig. 3 (a) is an optimum heater for the inside temperature when the bread is toasted by the microwave oven. FIG. 3B is a graph showing the heating time, and FIG. 3B is a graph C showing the optimum heating time of the lower heater. 2 ... Upper heater, 3 ... Lower heater, 4 ... Thermistor.

Claims (1)

[Claims] 1. A heating and cooking method for a microwave oven with a toaster function, which has an upper heater and a lower heater arranged to face each other vertically, wherein a step of continuously energizing the upper heater and the lower heater at the start of cooking, and energization. A step of measuring the temperature inside the refrigerator at the time when a fixed time has elapsed after the start, and a step of controlling the upper heater and the lower heater so that the preset energization time is set for the measured temperature inside the refrigerator. A method for heating and cooking a microwave oven with a toaster function, which comprises: