KR930011048B1 - Heating & cooking device - Google Patents

Abstract

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Description

How to calibrate zero point of cooker and cooker

1 to 6 show a first embodiment of the present invention, in which FIG. 1 is a block diagram which appears simultaneously with the configuration of the main parts.

2 is a perspective view of a microwave oven.

3 is a schematic view of a weight sensor portion.

4 is a diagram showing a relationship between a detection signal and weight.

5 is a flowchart showing the contents of write control.

6 is a flowchart showing the content of heating cooking control.

7 and 8 correspond to the equivalent of FIG. 1 and the equivalent of FIG. 3 showing the second embodiment of the present invention.

9 and 10 correspond to Fig. 1 and Fig. 3 corresponding to a third embodiment of the present invention.

Figure 11 is a schematic longitudinal sectional view showing the related art.

12 is a perspective view from behind the operation panel showing another related art.

* Explanation of symbols for main parts of the drawings

12: heating cooking chamber 17: drive motor

18: Tentable 19: Waveguide

20: magnetron 21: door switch

22: main relay 23: rectifier circuit

24: inverter circuit 25: high frequency transformer

26, 26a: microcomputer 27: inverter control circuit

28: weight sensor 29: sensor mounting plate

30: displacement detector 31: oscillation circuit

32: fixed electrode 33: movable electrode

34, 38: nonvolatile memory 40: unit

41, 42: writing device 43: mode setting switch

44: write switch

The present invention includes a weight sensor for detecting the weight of a food placed on a pedestal on which a cooking object is placed in a heating cooking chamber and outputting a level signal according to the weight thereof, and heating operation based on a detection signal from the weight sensor. It relates to a heating cooker and a zero calibration method of the heating cooker to control the.

As shown in FIG. 11, a conventional heating cooker microwave oven allows food to be placed on a ten table (2) corresponding to a base on which a workpiece of the heating cooking chamber (1) is placed, and the weight of the food is a weight sensor. It is detected by (3).

In this case, since the weight sensor 3 detects the weight of the tentable 2 together with the food, the weight of the tentable 2 without the food is actually detected in advance, so that the weight of the tentable 2 on which the food is placed. The weight of the food can be detected by removing the detected weight of only the ten tables 2 from the detected weight.

However, detecting the weight of the tent table 2 without food in advance is annoying in weight detection or uneven weight in each of the ten tables. . The zero adjustment is as follows.

As shown in FIG. 11, in the state where only the ten table 2 is arranged, the variable resistor 5 provided in the bottom portion of the microwave oven main body 4 is adjusted as a driver through the hole 6 in the bottom portion, and the variable resistor ( The output of the reference value generator with 5) is made to be at the same level as the output of the weight sensor described above.

In other words, the variable resistor 5 functions as a storage unit for storing reference values. In addition, the variable resistor 5 for adjusting the zero point may be configured to be adjusted on the side of the operation panel 7 as shown in FIG.

In the above configuration, however, the variable resistor 5 needs to be adjusted so that the output of the reference value generating circuit is at the same level as the output of the above-described weight sensor, so that fine adjustment is required and time is required for the zero point adjustment operation.

Therefore, when the zero point adjustment to the manufacturing line has to stop the line, there is a problem that the productivity is lowered, resulting in a decrease in assemblability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a heating cooker capable of easily performing a so-called zero point adjustment in a short time.

The present invention is provided with a weight sensor for detecting the weight of the food placed on the base on which the cooking object is placed in the heating cooking chamber and outputting a level signal according to the weight thereof, and heating operation based on the detection signal from the weight sensor. And a nonvolatile memory for storing, as reference data, the level of the detection signal from the above-described weight sensor in a state in which the food is not placed on the base on which the above-mentioned workpiece is placed. It features.

In this case, a writing apparatus for reading and writing the level of the detection signal from the above-described weight sensor and writing to the above-described nonvolatile memory may be provided.

According to the above-described apparatus, since the non-volatile memory for storing the level of the detection signal from the weight sensor described above as reference data without placing the food on the base on which the workpiece is placed, the level of the detection signal is provided. The reference value itself can be regarded as a reference value, and the reference value can be stored as a processing by a microcomputer or the like, and therefore, there is no need to make analogous subtle adjustments unlike the variable resistor of the reference value generating circuit described above, so-called zero point. Adjustment can be easily performed in a short time.

In this case, the whole device is provided with a writing device for reading and writing the level of the detection signal from the weight sensor and writing it to the nonvolatile memory described above. It can contribute to the improvement of product assembly compared with the case where adjustment is performed.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 6.

First, FIG. 2 shows a microwave oven as a heating cooker, and a heating cooking chamber 12 is formed inside the range body 11. The heating cooking chamber 12 is opened and closed by the door 13.

Moreover, the operation panel 14 is provided in the front of the range main body 11, and various switches 15 and the indicator 16 are arrange | positioned at the operation panel 14. As shown in FIG.

At the lower portion of the bottom plate of the heating cooking chamber 12, a motor 17 (see FIG. 1) for driving a tentable is installed, and a rotary shaft 17a protrudes inward from the bottom plate of the heating cooking chamber 12. have.

It is possible to attach the tentable 18 as a stand for placing a workpiece on the protruding end of the rotary shaft 17a so that attachment and detachment are possible. In FIG. 1, the electrical schematic and mechanical schematic of the microwave oven are shown simultaneously.

A waveguide 19 is formed at an upper portion of the heating cooking chamber 12, and a magnetron 20 is provided at an end of the waveguide 19, and the microwave output from the magnetron 20 is heated. Food can be cooked by heating it.

The magnetron 20 is configured to supply power through the first door switch 21, the main relay 22, the rectifier circuit 23, the inverter circuit 24, and the high frequency transformer 25.

The main relay 22 is controlled by the microcomputer 26a constituting the controller, and the inverter circuit 24 is controlled by the inverter control circuit 27 of the one controlled by the microcomputer 26a. The output of the magnetron 20 can be changed.

The microcomputer 26a is also connected with various switches 15 and indicators 16 provided on the operation panel 14 described above. On the other hand, the weight sensor 28 is comprised by the displacement detector 30 and the oscillation circuit 31 which were provided in the sensor mounting plate 29 as shown in FIG.

The displacement detector 30 includes a fixed electrode 32 and a movable electrode 33, and the movable electrode 33 is spaced apart from the fixed electrode 32 according to the vertical displacement of the motor 17. In addition, the capacitance between the positive electrodes 32 and 33 changes.

The oscillation circuit 31 processes and outputs an electric signal by the oscillation circuit according to the capacitance between the positive electrodes 32 and 33. In this case, the oscillation circuit 31 outputs a detection signal (frequency signal) Fout which is directly proportional to the weight of the motor 17. To output (see Figure 4).

In addition, a nonvolatile memory 34 is connected to the microcomputer 26a described above, and the nonvolatile memory 34 is provided from the above-described weight sensor 28 in a state in which food is not placed on the above-mentioned ten table 18. Is to store the frequency level of the detected signal as reference data.

In addition, a mode setting switch 35 for zero adjustment is connected to the microcomputer 26a. The mode setting switch 35, the microcomputer 26a, and the nonvolatile memory 34 have the same substrate 36. Is actually installed on the inner surface of the operation panel 14 described above.

The microcomputer 26a not only controls the heating operation based on the detection signal from the weight sensor 28 but also has a function as a writing device for storing reference data in the nonvolatile memory 34.

The control contents of the microcomputer 26a incorporating a function as a writing apparatus as shown in FIG. 1 will be described in the first embodiment with reference to the drawings.

5 shows the program contents as a writing device of the microcomputer 26a. This program is started on the maker side by turning on a power switch (not shown) after assembling the product.

First, the operator attaches the tentable 18 to the rotary shaft 17a, and when the mode setting switch 35 is operated (determined in step S1), the operator reads and writes this detection signal (frequency signal) Fout from the weight sensor 28. (Step S2), the period from the start of operation of the first pulse of the frequency signal of the detection signal Fout to the start of operation of the next pulse is counted to obtain a period, and the frequency (detection signal level) is obtained from this period.

This frequency is set as Fo as reference data (step S3) and stored in the RAM of the microcomputer 26a (step S4). The weight is displayed on the display unit 16 in accordance with the reference data Fo (signal Fout) (step S5).

The purpose of this indication is to set an opportunity for the operator to judge the presence or absence of abnormality, that is, the weight displayed on the indicator 16 when the attachment of the tentable 18 is forgotten or the accident of the weight sensor 28 itself occurs. This is far beyond the expected weight range. Therefore, the user can determine the presence or absence of abnormality by looking at the displayed weight. In addition, when there is an abnormality, you may be informed as a rich man (bell).

However, if a switch for writing, for example, a start switch is operated (judged in step S6), the reference data Fo is written into the nonvolatile memory 34 (step S7). After that, when the mode setting switch 35 is operated again (step S8), the control for writing ends. Further, the reference data Fo is handled as follows when the microcomputer 26a controls the heating operation.

6 shows the control program contents for the heating operation of the microcomputer 26a. First, the reference data Fo is read and written from the nonvolatile memory 34 (step P1). In this case, the reference data Fo is set to a value corresponding to the case where the detection signal Fout is 16 mW (thus 1120 g of the weight of the ten table 18 alone, see FIG. 4).

Thereafter, the detection signal (frequency signal) Fout from the weight sensor 28 is read and written (step P2), and the time from the start of the operation of the first pulse to the start of the next pulse of the frequency signal of the detection signal Fout is counted. The period is found, the frequency (level of the detected signal) is obtained from the period, and the frequency is converted into the detection data Fk (step P3), and stored in the RAM of the microcomputer 26a (step P4).

In this case, the detection data Fk is set to a value corresponding to the case where the detection signal Fout is 28.8 kV (hence the total weight of the tentable 18 and the food is 5120 g, see FIG. 4).

Subsequently, it is judged whether or not this detection data Fk has a range of ± 66 Hz with respect to the reference data Fo (step P5).

The purpose of this judgment is to judge whether or not food is placed on the tentable 18. If the detected data Fk of the tentable has a range of ± 66 ms with respect to the reference data Fo ("YES" in step P5), the food is placed. It is judged that there is no stand to put.

In this case, the flag FGL1 is turned off (step P6). If it is not within the range ("NO" in step P5).

It is determined whether the detected data Fk is lower than the reference data Fo (step P7). If the detected data Fk exceeds the reference data Fo ("NO" in step P7), that is, if food is placed on the ten table 18, If the detection data Fk is lower than the reference data Fo ("YES" in step P7), i.e., if the ten table 18 is not attached, the flag FLG1 is turned on (step P8).

If the menu selection switch is operated (judged at step P9) and the start switch is operated (judged at step P10) and the door switch 21 (see FIG. 1) is turned on (judged at step P11) the flag FLG1 It is determined whether is on or off (step P12).

When the flag FLG1 is turned on, the indication of the absence of the ten tables 18 is shown on the display 16 (step P13).

This flag FLG2 is set to OFF in advance by initial setting. Therefore, initially, the flag FLG2 is turned off, and the weight Fs of the food is determined based on the reference data Fo and the detection data Fk (step P15).

That is, the weight Fs of the food is calculated by removing the reference data Fo from the detection data Fk. In this case, since the detection data Fk is 28.8 kPa (equivalent to 5120 g) as described above, and the reference value data Fo is 16 kPa (equivalent to 1120 g), the weight Fs of the food is determined as 4000 g.

After that, after setting the heating time according to the determined weight (step P16), the magnetron 20 is driven to start the heating operation (step P17), and the flag FLG2 is turned on (step P18).

After that, if the heating time does not pass the set time (judgment in step P19), the flow returns to step P11. If the heating time has elapsed, the flag FLG1 and 2 are turned off, and the driving of the magnetron 20 is stopped to complete the heating operation (step). P20).

As will be apparent from the foregoing description, the present invention provides a nonvolatile memory for storing the above-described level of the detection signal Fout from the weight sensor 28 without placing food on the table 18 as reference data Fo. 34), if the detection signal Fout is processed into data suitable for the storage value, the level itself of the detection signal Fout can be used as the reference value, and the reference value can be stored by the microcomputer 26a.

In other words, unlike the conventional method in which the detection signal Fout taken out from the weight sensor 28 is stored as a reference value in the nonvolatile memory 34, the variable resistance for so-called zero point adjustment must be delicately adjusted. No adjustment is required and zero adjustment can be easily performed in a short time.

In the first embodiment, since the microcomputer 26a is provided with a writing device for writing to the above-described nonvolatile memory 34 by reading and writing the level of the detection signal Fout from the weight sensor 28 described above, Zero point adjustment is possible in the state of assembling the product, and even if the zero point adjustment is performed during manufacturing, it can contribute to the improvement of the assemblability of the product.

7 and 8 show a second embodiment of the present invention, in which the following points differ from the above embodiment.

The nonvolatile memory 38 is provided on the same substrate 39 as the oscillation circuit 31, and the substrate 39 is integrally installed with the sensor mounting plate 29 described above, and these are the weight sensors. It consists of the unit 40 containing 28.

In addition, the microcomputer 26 for operation control is not equipped with a writing apparatus.

In the second embodiment, a separate device 41 is required for writing the detection signal Fout from the oscillation circuit 31 to the nonvolatile memory 38 as the reference data Fo, but the device 41 is connected to the unit 40. If the oscillation circuit 31 and the nonvolatile memory 38 are connected to each other, the reference data Fo can be written to the nonvolatile memory 38 by the unit 40 alone in the manufacturing step.

9 and 10 show a third embodiment of the present invention, in which the following points are different from the second embodiment. The unit 40 is always provided with a microcomputer 42, a mode setting switch 43, and a writing switch 44 for writing the reference data Fo. In addition, this invention is not limited to the said Example, It can change and implement within the range which does not deviate from the summary.

The present invention is provided with a weight sensor for detecting the weight of the food placed on the pedestal on which the cooked material of the heating cooking chamber is placed, and outputting a signal of the level according to the weight, as is clear from the above description, and detecting at the weight sensor. In order to control the heating operation based on the signal, a fire for storing the above-described level of the detection signal from the weight sensor as reference data without placing the food on the base on which the above-mentioned object is placed. It is characterized by having a volatile memory, so that the reference value can be stored as a process by a microcomputer, and thus, unlike the variable resistor of the conventional reference value generating circuit, so-called zero point adjustment that does not require analog fine adjustment. Can be easily performed in a short time.

In this case, if a device for reading and writing the level of the detection signal from the above-described weight sensor and writing to the above-described nonvolatile memory is provided, the zero point can be adjusted while the product is assembled or during manufacture. It can contribute to the improvement of sex.

Claims (6)

The heating cooking chamber 12, a pedestal 18 on which to place the cooked goods installed in the heating cooking chamber, and the weight of the food placed on the pedestal on which the cooked food is placed are detected through the pedestal, and the level is determined according to the weight. In a heating cooker having a weight sensor 28 for outputting a detection signal of the control unit and a control unit 26 for controlling heating cooking based on the detection signal, the food is placed on a pedestal 18 on which the above-mentioned cooking object is placed. And a nonvolatile memory (34, 38) for storing, as reference data, the level of the detection signal from the above-described weight sensor in the state of not being placed thereon. The writing apparatus (26a, 41, 42) according to claim 1, wherein the above-described control unit reads and writes the level of the detection signal from the above-described weight sensor 28, and writes it to the aforementioned nonvolatile memories 34,38. Heating cooker characterized in that it is provided with. The nonvolatile memory (38) according to any one of the preceding claims, wherein the nonvolatile memory (38) is provided on a substrate, and the substrate is integrally installed with the substrate (40) on which the aforementioned weight sensor (28) is disposed. Heat cooker characterized in that. In the zero calibration method of a heating cooker for detecting the weight of the cooked food placed on the base on which the cooking objects placed in the heating cooking chamber are placed, and determining the weight of the food by using the weight sensor. and the step (S2) is written by reading a detection signal Fout of the level according to the weight, the zero point correction method of the heating cooker, characterized in that a step (S ₄₎ for storing the level of the detection signal Fout as a reference data Fo . 5. The zero point correction method according to claim 4, wherein the above-mentioned storing step (S4) has a step (S7) of writing the reference data Fo in the nonvolatile memory. 5. The zero point correction method according to claim 4, further comprising a step (S5) of performing the step of reading and writing the above-described detection signal Fout and then displaying the reference data Fo.