JPH0645062A - High frequency heating device - Google Patents

Abstract

PURPOSE:To provide a proper heating output regardless of power source voltage fluctuation by detecting power source voltage, and increasingly and decreasingly correct microwave heating output according to this. CONSTITUTION:When control is started, the value of the present power source voltage V is judged on the basis of the output of a power source voltage detecting circuit 38. To basic heating patterns, wattage correction corresponding to voltage fluctuation is conducted every pattern, and this value is set as the actual magnetron output. A magnetron 13 is ON, and for the oven thawing heating of a material 40 to be heated at the set output, the magnetron 12 is ON/OFF in the above pattern, considering voltage fluctuation to conduct the duty control of the output. When the full set cooking time is elapsed, completion of cooking is judged by a humidity sensor 15 on the basis of this, and the magnetron 13, a turn table 14, and a fan motor 12 are OFF to complete the thawing cooking control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency heating device.

[0002]

2. Description of the Related Art Generally, in a high-frequency heating device such as a microwave oven, when a range heating setting operation is performed using a menu key of either the auto menu (automatic heating) or the manual menu (manual heating), the corresponding operation is performed. For example, as shown in FIGS. 5 and 6, an appropriate magnetron energization amount or energization time for microwave heating is automatically set corresponding to the heating patterns A and B, and the heating pattern A is set according to the set heating amount. , And the range heating according to B is performed to finish it in a desired finished state.

[0003]

However, during heating with the microwave output corresponding to the heating amount set as described above, the power supply voltage itself fluctuates as shown in FIG. 7 (a), for example. However, if the voltage supplied to the magnetron is reduced as ΔV ₁ to ΔV ₆ , the output of the magnetron is also reduced, and the originally set heating amount cannot be secured, so that it is temporarily set. Even if the total cooking time T elapses, there is a problem that heating is insufficient and a good finished state cannot be realized.

Further, since the magnetron output must be properly controlled according to the type of cooking, it is not preferable that the fluctuation of the power supply voltage is unnecessarily increased not only when it is decreased.

[0005]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the above-mentioned problems, and includes heating means for heating an object to be heated by microwave output, and heating output of the heating means. Is set in advance according to the amount of the object to be heated, and the output of the heating means is controlled according to the cooking process so that the heating output set by the heating output setting means is obtained. In a high-frequency heating device comprising heating output control means, a power supply voltage detection means for detecting a power supply voltage, and the heating output setting means set in accordance with the value of the power supply voltage detected by the power supply voltage detection means. Heating output correction means for increasing / decreasing the heating output of the microwave heating means is provided so that an appropriate heating output can always be obtained regardless of fluctuations in the power supply voltage. .

[0006]

The high-frequency heating device of the present invention, as described above,
Heating means for heating an object to be heated by microwave output,
A heating output setting means for preliminarily setting the heating output of the heating means according to the amount of the object to be heated, and cooking the output of the heating means so that the heating output set by the heating output setting means is obtained. In a high-frequency heating device comprising heating output control means for controlling according to a process, a power supply voltage detecting means for detecting a power supply voltage, and the heating output according to the value of the power supply voltage detected by the power supply voltage detecting means. And a heating output correction means for increasing / decreasing the heating output of the microwave heating means set by the setting means. When the power supply voltage drops, the heating output set value is correspondingly increased. In the opposite case, it acts so as to reduce the set value in the opposite case, so that an appropriate heating output can always be obtained regardless of fluctuations in the power supply voltage.

Therefore, the finished state of the object to be heated is stable,
Problems such as poor heating and overheating do not occur.

[0008]

As a result, according to the high-frequency heating device of the present invention, the finished state of the cooked food can be always maintained at a constant state after the completion of cooking regardless of the fluctuation of the power supply voltage. It will always be possible to provide a good finished taste.

[0009]

【Example】

(1) First Embodiment FIGS. 1 to 5 show the configuration of a high-frequency heating device (microwave oven) according to a first embodiment of the present invention.

First of all, FIG. 1 shows the overall structure (housing structure) of the high-frequency heating apparatus 1, in which a heating chamber (cooking product storage) 2 is provided inside the housing 1a. A turntable 3 for placing a food item is rotatably installed on the bottom of the heating chamber 2. A door 16 having a finder portion 17 is attached to the front opening 19 of the heating chamber 2 so as to be vertically openable and closable.
A door switch 18 is provided on the side of the main body corresponding to the door 16.

On the other hand, the door 16 on the front side of the housing 1a.
Operates various functions of the high-frequency heating device on the right side of
An operation panel unit 26 for controlling is installed. As shown in detail in FIG. 2, for example, the operation panel 26 includes a display section (liquid crystal display section) 34, a heating time setting key for manual menu (5 minutes, from the upper side to the lower side (or left and right)). (1 minute, 10 seconds consisting of 3 keys) 27, start key 28a, cancel key 28b, manual heating key
(It consists of 5 keys: range strong / weak, raw thawing, toaster, pizza heating) 29, automatic heating key (6 keys: warm, milk warm, sake can, toast, frozen toast, cooked rice) 30 , Finish adjustment key (finish,
37, which has two functions for adjusting the color of the burnt color, and is composed of two keys, a strengthening key and a weakening key, and a time setting key 38 are appropriately arranged with good operability.

When the above-mentioned various operation keys on the lower side are turned on, for example, various selection setting states are displayed on the display section 34 as shown in FIG.
(FIG. 2 shows a state in which all operation information is displayed).

The operation panel section 26 is connected to a control unit 20 for controlling a microwave oven mainly composed of a microcomputer as shown in FIG. 3, for example, via a data bus and a control bus so that signals can be freely transmitted. It can be sent and received.

Further, as is clear from FIG. 3, the object to be heated on the defrosting net 5 placed on the turntable 3 in the heating chamber 2 inside the housing 1a of the high-frequency heating device 1 ( In this example, the defrosted food (40) is heated by causing the microwave to be absorbed by the magnetron (13), and the object to be heated in the heating chamber (2) is heated by irradiating it with infrared rays as needed. When,
A ventilation fan 12a and a fan motor 12 are installed as illustrated. A turntable motor drive circuit 24 is provided between the control unit 20 and the turntable motor 4, a fan motor drive circuit 25 is provided between the control unit 20 and the fan motor 12, and the control unit is further provided. A magnetron drive unit 22 is provided between the magnetron 20 and the magnetron 13. The turntable motor 4 is provided with a weight sensor 36, and the detection value K detected by the weight sensor 36 is used to determine the amount (weight) of the food. further,
Reference numeral 37 is a power supply circuit, which distributes and supplies the power supply voltage V from the AC power supply 100 (V) to the magnetron drive unit 22, the turntable motor drive circuit 24, and the fan motor drive circuit 25. The voltage of the AC power supply is detected by the voltage detection circuit 38 and input to the control unit 20.

On the other hand, as shown in the figure, an outside air introduction port 8 is formed on one side wall 31 side of the housing 1a, and an exhaust port 11 is formed on the other side wall 32 side, and the heating chamber 2 between them is formed. Ventilation openings 9 and 10 are formed in both side walls 6 and 7, respectively. A fan 12a driven by the fan motor 12 is provided between the outside air introduction port 8 and the ventilation port 9, and the outside air introduced through the outside air introduction port 8 is indicated by an arrow in the figure. First, magnetron 1
After cooling 3, the odor and steam during cooking are absorbed through the upper part of the heating chamber 2 and discharged from the exhaust port 11 side. The duct portion 14 is formed between the ventilation port 10 and the exhaust port 11, while the duct portion 1 is provided.
A humidity sensor 15 for detecting the humidity W at the time of heating, boiling, and heat retention is installed in the middle of the passage of No. 4, facing the passage. The output signal of the humidity sensor 15 is input to the control unit 20 via a predetermined detection unit 23 and stored in the memory.

When the humidity sensor 15 detects that the object to be heated is in a boiling state during cooking, the control unit 20 heats the magnetron 13 in the subsequent simmering process according to the level. For example, the output is automatically adjusted to realize an appropriate simmering heating state in which spillage does not occur, and, if necessary, in accordance with the detected humidity W and the output of the weight sensor 36 in a heat retention state after completion of cooking. It is designed to control the heat retention output set in more detail.

Next, the contents of the cooking control when the object 40 to be heated is thawed and the voltage fluctuation correction control during the cooking control by the control unit 20 of the present embodiment will be described.

First, the above-mentioned decompression key and start button 2
Control is started by turning on 8a. And step S ₁
Then, the turntable motor 4 and the fan motor 12 are driven based on the operation menu data (cooking menu) determined from the operation state of the defrosting key of the operation panel section 26, and the weight sensor 36 detects the weight sensor 36 in step S _2. Input the output data K.

Next, in step S ₃ , the current value of the power supply voltage V is determined based on the output of the power supply voltage detection circuit 38.

For the judgment, for example, as shown in FIG. 7, the power supply voltage V is detected in a predetermined cycle, and the value is a normal voltage value.
This is performed by forming voltage fluctuation detection pulses (W _{1 to} W ₆ ) having a larger pulse width when the voltage is lower than (100 V) Vs (the reduction amount ΔV is larger).

Next, proceeding to step S ₄ , with respect to the basic heating pattern A (200 W) + (B 100 W) shown in FIG. 5, the wattage correction corresponding to the variation amount of the voltage for each pattern, A (W ) = 200 (W) × Vs / (Vs−ΔV), B
(W) = 100 (W) × Vs / (Vs−ΔV) is performed to finally set the calculated values A (w) and B (w) as actual magnetron outputs.

Then, in step S ₅ , the magnetron 13 is turned on, and the object 40 to be heated at the set output is subjected to range thawing heating in the heating pattern shown in FIG.

Next, in step S ₆ , the same magnetron 13 is used.
If the ON time of the magnetron has elapsed, or if the ON time of the magnetron has elapsed, the magnetron is turned on again in step S _7.
After the FF, now going to perform properly configured duty control of the magnetron output in consideration of the above voltage variation by determining each elapse of the OFF time in step S _8.

[0024] When eventually reaches the stage where elapses set total cooking time T, the course of the total cooking time T is determined the completion of the cooking as a reference in step S _9, the YES determination is made, the final step S _{At 10} , the above magnetron 13,
The turntable 4 and the fan motor 12 are turned off to complete the defrosting cooking control.

As described above, in the defrosting cooking control of this embodiment, the magnetron output is always corrected to a substantially appropriate output value in accordance with the fluctuation of the power supply voltage V.
Problems such as unsatisfactory thawing due to insufficient heating as in the past will not occur.

In the above embodiment, the output of the magnetron 13 is the duty value of the applied voltage, as shown in FIG.
That is, the correction control is performed by the wattage, but it goes without saying that this may be controlled by the correction of the heating time as shown in FIG. 6, for example.

[Brief description of drawings]

FIG. 1 is a perspective view showing a housing structure of a high-frequency heating device according to a first embodiment of the present invention.

FIG. 2 is an enlarged front view showing a structure of an operation panel section of the same device.

FIG. 3 is a block diagram mainly showing a configuration of a control circuit unit of the device.

FIG. 4 is a flow chart showing a control operation at the time of range heating and thawing cooking by the control unit of the same apparatus.

FIG. 5 is a time chart of a heating process corresponding to the control of FIG. 4 described above.

FIG. 6 is a time chart showing a modified example of the heating step of the cooking control operation by the control unit of the high-frequency heating apparatus according to the embodiment of the present invention.

FIG. 7 is a flowchart showing a power supply voltage detecting operation in the cooking control operation of the high-frequency heating apparatus according to the embodiment of the present invention.

[Explanation of symbols]

1a is a housing part, 2 is a heating chamber, 3 is a turntable, 5 is a defrosting net, 13 is a magnetron, 20 is a control unit, 2
2 is a magnetron drive unit, and 36 is a weight sensor.

Claims (1)

[Claims] 1. A heating means for heating an object to be heated by microwave output, a heating output setting means for preliminarily setting a heating output of the heating means according to the amount of the object to be heated, and the heating output setting. In a high-frequency heating device comprising a heating output control means for controlling the output of the heating means according to the cooking process so that the heating output set by the means is obtained, a power supply voltage detecting means for detecting the power supply voltage, and Heating output correction means for increasing / decreasing the heating output of the microwave heating means set by the heating output setting means in accordance with the value of the power supply voltage detected by the power supply voltage detecting means is provided, regardless of fluctuations in the power supply voltage. The high-frequency heating device is characterized by always obtaining an appropriate heating output.