JPS6349635A - Microwave oven - Google Patents

Abstract

PURPOSE:To control heating under a condition that the effect of the noise of microwave is excluded, and improve the finish of cooking, by a method wherein the driving of a microwave supplying means is stopped to correct a desired temperature when a detecting temperature has arrived at a temperature of low value, which is lower than the desired temperature by a predetermined temperature, while the driving of the microwave supplying means is started again and effected until the detecting temperature arrives at a corrected temperature. CONSTITUTION:When a detecting temperature has arrived at a low value temperature Tt, lower than a cooking finishing temperature T0 by a predetermined temperature 5 deg.C, microwave heating is stopped, and a predetermined time of 5 sec is set in a timer (TM). When 5 sec has elapsed, a flag F1 is set. Successively, a cooking finishing temperature T0 is corrected to a temperature T' based on a difference between the detecting temperature T and the low value temperature Tt, then, the flag F2 is set and the microwave heating is re-started. The re-started heating is carried out until the detecting temperature T (with the noise of microwave on the minus side of the wave) arrives at the cooking finishing temperature T'.

Description

[Detailed description of the invention] Industrial application field *15 Romei detects the food temperature and uses the microphone OtJJ! , relates to a microwave oven that controls a ytn PA.

(b) Conventional technology English J! As seen in No. 5.6-10072, in the conventional microwave oven, the microwave r oscillated from a magnetron as a microwave supply means is supplied to Kaen Tominouchi through a special pipe valve. The microwave heats the food on the turntable to zero.

- An infrared sensor is provided outside the heating chamber as a second temperature detection means for detecting the temperature of the food by receiving infrared rays from the food. Then, based on the detection from the sensor, the microphone of the above magneto
? 1m 'j from R: fljlJφO is Vζ.

In this case, the packaging is such that the A8-sized microwaves supplied in the heating chamber do not leak out to the outside, but the holes in the microwaves are not completely suppressed.

When such a leakage occurs, the noise caused by this sensor is added to the output of the above sensor, and the SN ratio of the sensor decreases significantly, making it difficult to heat the sensor at an accurate temperature. There is a drawback that the cape loses f5 when executed and the cooking quality deteriorates.

? → Problems to be solved by the invention The present invention solves the problem of heating (bl) while completely eliminating the influence of noise.
The goal of the Cape is to obtain a microwave oven with a good quality finish.

(Means for solving the problem are uninvented.) A 7111 heat chamber for storing food, a microwave supply means for supplying microphone C waves for heating the food into the heating chamber, and a means for detecting the temperature of the food. In the microwave oven, the microwave oven includes a temperature detecting means for detecting temperature, and an igIJ cape section for controlling the MJ of the microwave supply means based on the temperature detection means.

The control unit includes a stop step of stopping the driving of the microwave supply means when the temperature detected by the temperature detection means reaches a predetermined temperature (lower than the desired temperature) after the microwave heating starts; a storing step of determining the detected temperature of the temperature detecting means at the time; a correcting step of correcting the desired temperature based on the difference between the detected temperature stored in the memory δ and the low temperature; The purpose is to perform the step of restarting the microwave supply means until the temperature detected by the temperature detection means reaches the corrected temperature.

(E) Effect According to the third aspect of the present invention, heating can be controlled at 11 ilJ at a detected temperature while completely eliminating the influence of microwave noise.

Example: The following will explain one example of the embodiment of the present invention with reference to all the drawings.

Figure 1 shows the orientation of the secondary microwave at 1 dri, LITt, and the magnetron (1) as a microwave supply means.
) Heat chamber (4) Circle rC supply zone, food (6) on main table (5) is heated by microwave.
Ru. - 10,000, outside the heating chamber (4) there is an infrared sensor (7) as a temperature detection means for detecting the food temperature by receiving the infrared edge of There is.

Figure 2 shows the circuit of such a microwave oven.
The control part that controls t1lJ, that is, the microcomputer (8
) is installed on the front operation panel (not shown) of the main unit (3), and the P5Tu
At the same time as inputting the information, the detected temperature f# information of the infrared layer sensor (7) is inputted via the A/D converter (1 (l), and the output of the heating Ig H is controlled based on this image information. When such a heating signal H is output, a Swiss-Nang circuit (i
ll is turned on, power from the fishing power source A4 is supplied to the high EE regeneration unit, high voltage is impressed on the Eli magnetron (1), microwaves are oscillated, and the sword OPA is activated.
It will be destroyed.

Now, in such a microwave oven, the heating chamber (
4) Although the microwaves supplied inside the fermentation system are designed to prevent leakage to the outside as much as possible, leakage of such microwaves cannot be completely suppressed. Part of the microwave is DO heat silkworm (4)
It leaked outside, and after 5 degrees, I was wrung. lE microwave oven,
U+ even if the product is the same model! Differences naturally occur between different products; in some products, noise caused by leaked microwaves is always positive on the output of the sensor (71), and in other products, such noise is added to the output of the sensor (71).
A situation arises in which the output is always negative.

Here, r:, 4. The sub-range is designed to be able to cope with microwave noise even if the same model is exposed to the microwave noise on the glass or minus side chair box.

Next, regarding such countermeasures, the operation of the microwave oven will be explained based on the flowchart of the program of the microcomputer (8) shown in FIG. 6, and the custom-made output diagram of the sensor (7) shown in FIG. 734. In FIG. 4, the horizontal axis shows the cooking time, and the vertical axis shows the detected temperature of the food by Senna (7).

A case where bad micro and noise are on the negative side will be explained.

Normally, the program cycles through steps S1 and S2. In step S1, use the keyboard (9) above.
The key information entered into the computer (8) -n, Sz
In the step, it is determined whether the sharpening operation is related to a menu key.

When the user operates the menu key that selects the number 1 on the keyboard (9), the information is manually input to the computer (8) in 81 steps.

Then the program goes through St, S2 steps (7) ['
The program exits from the step S6 and reaches step S6 (/c. In this step, the 1'L information regarding the menu key with the above-mentioned operation procedure, in this case -
, z) Hour temperature for the sword 1, that is, the cooking end temperature K T
'(In this case, 55℃) is the computer + 8) Bij's memory (l (OM) sword 1 is taken out. Guagram ri
Missing S4. Cycle through step S5. The S4 step is the same as the S1 step above.
It is determined whether or not the input news from the step ζ is related to the start.

And the start key? When operated, the program is 84
．． The cycle exits from the S5 step and reaches the 86th step. In this step, the computer (8J yen flag CF"1J
(F2) are both t-throttled.

In step S7, a lower low temperature Tt is calculated from the end temperature To of the above rule 1 (e.g. 5℃). The influence of noise has a large effect on the temperature rising or falling.

Continuation (In step 88, heating No. 18 H starts to output,
Microwave heating is started.

The program then cycles through steps 89-S12. In step S9, the detected temperature T of the sensor (7) is input q
: n, 51 (in the 3rd step, the flag CF'2J is reset or the resultant force 1 is cut off, in the S11 step the flag (Fx) is reset or the resultant force - is published, and in the S12 step the above test is It is analyzed whether or not the temperature eT has reached the above-mentioned low value 0 degrees 1'L.Thus, during the circulation of steps S9 to S12, ttont+'/I
Q-detection temperature T gradually increases as the sword n-waki moves. The degree of cooperation T is negative with microwave noise on the negative side (range 1dlfl of %Note a in Figure 4).

The detected temperature is 5 degrees Celsius from the cooking end temperature To.
When the low value temperature Tt is reached (point B in custom diagram a in Fig. 4), the program executes S1 as a stop step.
! Proceed to step (r0 1 at this step, above, 711
1, the output of the heat signal I is stopped, and the microwave heating is stopped. In the following step S14.

A predetermined time f is set in the timer ('rg) in the computer (8).
5 seconds is 9 cents, and a down count starts from that time. In the following step S15, it is determined whether the content of the timer (TM) has become 0, that is, whether 5 seconds have passed or is old. The program remains in the forward step until 1 lcs seconds have elapsed (custom diagram a range employment J0 and 5
After seconds have elapsed, the program reaches step S16. A flag (Ft) is set in this step. The program then returns to step S9. In this case, in C @ Chion type T, microwave heating is stopped and the microwave noise is on the negative side. It's still 5 degrees Celsius (it's rising).

Accurately represents food temperature (Fig. 4 custom-made diagram aC)J
Point Y]. Therefore, the detected temperature T is determined by the computer (8)
The temporary record t is written in the section (MEMJ).Here,
At this point, the 89 steps are V when T microwave heating is stopped.
The next step is to memorize the detected temperature T.

When the program reaches step S11 after going through all the SIO steps, the program finds that the flag (Fl) is set in this case, and then goes to step S17 as a correction step. In this step, the time storage unit (ME
Based on the difference between the detected temperature iT stored in M) and the low temperature Tt, the 1-fill end 2gTo is 7Ia plus the above.

The actual correction formula is as follows, where Tt is the corrected cooking end temperature.

'? -(Tt-T)+T.

In this case, Tt<T.

T'=-X+TO becomes. Here, X is n expressed by the following formula.

x=zTt, -TJ That is, in this case, the corrected cooking end temperature T' is.

It becomes I, which is obtained by subtracting the above ix from the original truth ending temperature To.

The program then reaches step 818. In this step, a flag (F2) is set. The following step S19 is the same as the above step S8, and microwave heating is restarted.

The program then starts at S9. The S10 step and the 820 step as a restart execution step are completely circulated. In step S20, it is determined whether the detected temperature KT (microwave and noise are on the negative side) during the restarted microwave heating has reached the corrected cooking end temperature T'. nru. In this case, it is impossible to judge whether such an event has been reached and 7: JrJ heat restart is executed.

Therefore, if such a point is not reached (point V in custom diagram a) -
F' f 5 m u Above b 9-810 m S 2
The cycle of Q steps is exited at the Sho step and the process proceeds to step 821. In this step, the output of the heating signal H is stopped, the cooking is completed, and a buzzer (not shown) is activated.
The completion of cooking will be notified.

Here, when the detected temperature T is measured at the end of cooking, the temperature r rises by the difference X from the cooking end temperature T' and becomes a value approximately equal to the original cooking end temperature TO (micro Because there is no wave noise], the result is a better quality of sake.

Next, a case will be explained in which microwave noise reaches the glass side.

In this case, when the menu key and start key related to the above-mentioned y-sake can are operated, the program advances to step S17 as described above. However, in this case, 89~S1
During the two-step circulation, the detected temperature T of the -1 sensor (7) gradually increases as it begins to heat up.

At such a measurement level T, microwave noise is on the glass side (Fig. 4, range 1 of note Fq).

In addition, in step S9 (when the above storage step is performed), the detected temperature T is during the microwave heating stop and the microwave noise is not on the glass side, that is, when the microwave power III is heated. The temperature related to micro and noise is lower (less than 5°C) compared to the previous model.

Accurately represents the food temperature.
Because T and Tfu are there.

T'-x 10T.

becomes. In the case of partial or intermediate, the corrected -fc cooking end temperature T' becomes the fc value by adding the above difference X to the original cooking end temperature To. After that, the program goes to step S9. When the detected temperature gT reaches the upper GQ corrected tLfc cooking end temperature T', the cooking is completed as described above.

Here, when we examine the detected temperature T at the end of the A treatment, we find that the temperature T at Qi is zl, which is approximately X difference from the end temperature T' at the end of leg burying, and approximately equal to the original temperature at the end of leg burying, and hair To. This results in 1 equal shift (because there are no microscopic noises), resulting in 14 cans being finished well.

In addition, in the imaginary case of f9A with no microwave -n,
In the above step S17, the difference X is 0 and 1 time T'mT.

It is easy to understand that. It can be seen that the customization of the detected temperature T in this case is based on the customization diagram C of the fourth factor.

In the above example, the desired temperature reached by one food item is the cooking end temperature, but it may be any desired temperature during cooking. In this case, the step S21 is a step of executing the next Calo heat and finishing the cooking.

(G) Effects of the Invention According to the present invention, it is possible to provide a practical microwave oven that can control heating while eliminating the shadow of microwave noise, and can therefore provide good cooking results.

[Brief explanation of the drawing]

The drawings show a microwave oven according to an embodiment of the present invention, Figure 1M1 is a sectional view, Figure 2 is a flowchart of the microcomputer program, and Figure 4 is a diagram of the infrared assembly 4+ characteristics.〇(1) ...Magnetron, (4)
...710 heat chamber, (71...infrared chamber?, (8
)...Microcomputer. If Sanyo Electric Co., Ltd.'s agent Takashi Nishino (1 other person) Fig. 1 Fig. 2 Fig. 4 1.

Claims (1)

[Claims] 1) a heating chamber for storing food; a microwave supply means for supplying microwaves for microwave heating into the heating chamber; a temperature detection means for detecting the temperature of the food;
In the microwave oven, the microwave oven includes a control section that controls driving of the microwave supply means based on the temperature detected by the temperature detection means, and the control section controls whether the temperature detected by the temperature detection means is lower than a desired temperature after starting microwave heating. a stopping step of stopping the driving of the microwave supply means when a low value temperature lower by a predetermined temperature is reached; a storing step of storing the detected temperature of the temperature detecting means at the time of such stopping; and a storing step of storing the detected temperature of the above-mentioned temperature detecting means at the time of such stopping. a correction step of correcting the desired temperature based on the difference between the temperature and the low value temperature; and a restarting step of restarting driving of the microwave supply means until the temperature detected by the temperature detection means reaches the corrected temperature. A microwave oven characterized by having an execution step.