JP2003028431A - High frequency heating apparatus equipped with range hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize bringing a high frequency heating apparatus equipped with a range hood into a high output, improving a ventilation capability, improving the property of installation by making the apparatus a light weight, and a stabilized safe fixing method. SOLUTION: There are provided a heating chamber 1, an electric power supply apparatus 2 for executing high frequency output control with a semiconductor device, ventilating means 3, and illumination means 4 for illuminating an article to be heated on another heating cooking apparatus. By executing high frequency output control for an optimum heating output linearly for proper time there are ensured linear control of a heating output, making the apparatus sharply light weight, so that there are ensured fastest heating cooking by maximum outputting, realization of optimum cooking performance, and sharp improvements of installation performance of any instrument onto a mounting wall and safety performance by stable fixing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a function of ventilating a generated gas generated from another heating and cooking apparatus installed below a main body of an apparatus, and converts electric power into high frequency electric power by using a semiconductor element. The present invention relates to a high-frequency heating device with a range hood.

[0002]

2. Description of the Related Art Conventionally, there has been no apparatus of this type having a structure for converting electric power into high frequency electric power by using a semiconductor element, and a structure for supplying high frequency electric power by an LC resonance circuit composed of a heavy object. And there was only heating equipment with ventilation. FIG. 7 shows a device having a conventional configuration.

In FIG. 7, 1 is a heating chamber for containing an object to be heated, 2 is a power supply device having an LC resonance circuit configuration for heating the object to be heated, and 3 is another heating installed below the main body of the apparatus. Ventilation means for ventilating the produced gas generated from the cooking device, and 4 are lighting means for irradiating the other heating cooking device installed below the main body of the device with light.

[0004]

However, in the above-mentioned conventional structure, since the high frequency power cannot be linearly controlled, the total maximum rating of each electric component is calculated with respect to the power consumption of the entire device for which the upper limit is defined. It was designed not to exceed that limit.

That is, even when the ventilation means and the lighting means are not operating, the total power consumption thereof is not added to the high frequency power for heating the object to be heated, and the power control at the time of cooking and heating is intermittent with a constant high frequency output. For this reason, it is not possible to supply high-frequency power accurately according to the heating state of the object to be heated during cooking, which is a factor that spreads the variation in cooking performance. Furthermore, LC
Power supply is 1 for high voltage transformer and high voltage condenser
It is a heavy object of about 0 kg, and the center of gravity is significantly biased toward the electric room side. When installing this heavy equipment, it is necessary to perform work by multiple people. Since the strength was insufficient, there was a problem in safety for stable fixing of the device.

The present invention solves the above-mentioned problems of the prior art by extracting the maximum high frequency power within a limited power consumption regulation value, maximizing cooking performance, and installing equipment. It is possible to significantly improve the workability and the safety of fixing the equipment after installation, and it is an object of the invention to provide cooking performance and equipment installation and safety that satisfy the customer.

[0007]

In order to solve the above-mentioned conventional problems, a high-frequency heating apparatus equipped with a high-frequency power control means by a semiconductor element and a range hood function of the present invention has a maximum power consumption upper limit value. It is possible to draw out the high-frequency power of, to adjust the high-frequency output linearly as needed, and to significantly reduce the weight of the equipment.

As a result, it becomes possible to realize the fastest heating cooking with the maximum output, the realization of a cooking sequence that brings out the optimum cooking performance, and the great improvement in the installation performance on the mounting wall surface of the equipment and the safety performance.

[0009]

According to the first aspect of the present invention, the high-frequency heating apparatus with a range hood is supplied with electric power by means of high-frequency electric power control means using a semiconductor element, so that the weight of the electric power supply apparatus having a large weight ratio is significantly reduced. As shown in Fig.8, it can be reduced, and it can be easily installed on the wall surface at a high place above other cooking equipment that is difficult to install, and because the weight balance is good, stable equipment fixing can be realized and safety It can greatly improve the sex.

According to a second aspect of the present invention, the power supply device of the high-frequency heating device with a range hood according to the first aspect is a high-frequency power control means using a semiconductor element, and a time-limiting element is provided in the power control means. It is possible to supply the linear heating output required for cooking the object to be heated for the required time, and it is possible to realize optimum cooking performance.

According to the invention described in claim 3, as shown in Table 1 in comparison with the effect of the prior art, the high frequency heating device with range hood according to claim 1 is supplied with high frequency power by a semiconductor element. By using the control means, in order to extract the maximum high-frequency power within the range that does not exceed the upper limit of power consumption of the entire device, the high-frequency heating output with the full upper limit can be drawn when the operation of ventilation means and lighting means is stopped. On the contrary, when the ventilation means and lighting means are operating, it becomes possible to freely control the power so that the high-frequency heating output stays within the upper limit of the power consumption of the entire equipment, and the maximum power consumption does not exceed the upper limit of the power consumption of the entire equipment. Limit heating power can be controlled as needed.

Further, in order to prevent the overheating destruction of the semiconductor element provided in the heating device having the largest self-heating, the temperature of the cooling air is detected, and the high frequency output is controlled before the occurrence of the trouble to prevent the destruction of parts, smoking and ignition. It can also be prevented.

According to a fourth aspect of the present invention, the power supply device of the high frequency heating apparatus with a range hood according to the first or second aspect is used as a high frequency power control means by a semiconductor element, and a constant output for a certain period after starting the power supply. By supplying a larger maximum high-frequency output, it becomes possible to effectively utilize the thermal efficiency at the time when the self-heating of the power supply device at the start of power heating is small, and it is possible to supply the heating output. It is possible to realize a significant reduction in the time required for light load cooking, which is highly effective.

According to a fifth aspect of the present invention, the power supply device of the high-frequency heating apparatus with a range hood according to the third or fourth aspect is a high-frequency power control means using a semiconductor element, and the maximum high-frequency power is maintained for a certain period after the start of heating. By supplying the output, it is possible to significantly reduce the time required for the light-load cooking, which is most frequently used and is effective.

[0015]

[Table 1]

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows the function and layout of each component in Embodiment 1 of the present invention.

In FIG. 1, the power supply device 2 has a structure in which high frequency power is controlled by using a semiconductor element, and a high frequency generator (magnetron) 2-1 and a power converter 2-2 using a semiconductor element are used as heating means. Are configured. Ventilation means 3
Is a structure in which the generated gas generated by cooking using another heating and cooking device 11 located below the device is taken into the inside from the intake port 7 provided in the bottom part of the device, and discharged through the ventilation means 3 to the front side of the device or outside the room. .

Further, the normal ventilation means may operate independently regardless of high-frequency cooking, or may detect the hot air depending on the degree of other cooking located below the device and automatically operate to provide ventilation. It is possible specification.

The first illuminating means 4 is an illuminating means for illuminating an object to be heated which is cooked by another heating and cooking apparatus below the equipment,
Usually located on the bottom of the device.

Further, the high frequency control means using a semiconductor element rectifies a commercial power source with a rectifier and converts it into a DC voltage, and supplies high frequency power by a resonance circuit and a semiconductor switching element.

FIG. 2 is a circuit diagram showing the configuration of the power supply device 2. The magnetron drive circuit is a DC power supply 100
And a high-voltage transformer 102 connected to the DC power supply 100
A second capacitor 103 connected in series to the primary winding side of the high-voltage transformer 102, a first capacitor 104 connected in parallel to the primary winding side, and a first capacitor 1
04, a second semiconductor switching element 105 connected in parallel, and a first semiconductor switching element 106 connected in series with the second semiconductor switching element 105.
Drive means 107 for driving the first semiconductor switching element 106 and the second semiconductor switching element 105, a rectifying means 108 connected to the secondary winding side of the high-voltage transformer 102, and the rectifying means. It is composed of a magnetron 109 connected to 108.

The operation and action of the high-frequency heating device with a range hood of the present invention constructed as described above will be described below.

First, in the structure of the embodiment shown in FIG. 1, the object to be heated 13 in the heating chamber 1 is 2.45 GH radiated from the magnetron 2-1 through the waveguide 14 at the same time when cooking and heating are started.
It is heated by the z radio wave. The article to be heated is placed on the article rotating means 9 to be heated and is rotationally driven by the operation of the drive unit 16 of the rotating means so that a uniform cooking finish is achieved. The magnetron 2-1 is forcibly air-cooled by the cooling means 6, and the second lighting means 10 illuminates the inside of the heating chamber 1 through the inside lighting hole 17 provided on the upper surface of the heating chamber so that the user can see the progress of cooking. Emit. The controller 12 determines whether or not the ventilation means 3, the first lighting means 4, and the object rotating means 9 which can be selected by the user are operating, and the power consumption due to the operation is added to the high frequency heating power. A signal is given to the power supply device so that the total power consumption of the device is efficiently controlled within the rated upper limit.

As shown in (Table 1), the power supply device is a high frequency power supply device using a semiconductor element, and the ventilation means, the first lighting means and the means for rotating the object to be heated in the equipment are provided. When all the functions are operated at the same time, the maximum heating power that can be supplied is the same as that of the conventional device as shown in the comparison between Example 4 and Examples 1 to 3 in (Table 1). When the ventilation device that consumes a large amount is not operated, the microcomputer provided in the control unit 12 determines the non-operation of the ventilation unit and transmits the signal obtained by adding the power consumption amount to the high frequency heating power to the power control unit. It is possible to supply higher-frequency heating power than ever before. Further, as shown in Example 6, when all the functions other than the high-frequency heating device such as the ventilation unit, the illumination unit, and the object rotating unit are not operated, the cooling unit necessary for cooling the heating unit is determined by the microcomputer as in the description of Example 5. It is possible to add all the power consumptions except the power consumption of No. 6 as the high frequency heating power and supply the maximum high frequency power within the predetermined power consumption limit for cooking. This enables the fastest cooking with the maximum possible output, optimal cooking performance, and a significant improvement in installation performance.

Further, in this embodiment, an element for detecting the temperature of the cooling air that cools the power supply device with a large amount of self-heating is provided inside the equipment, so that a high frequency output is generated before the power supply device has a problem due to overheating. It is possible to suppress the temperature and prevent parts from being destroyed due to overheating, smoking, and ignition.

In addition, the high frequency power supply apparatus using the semiconductor device of this embodiment has the weight of the conventional LC
Compared to the resonant power supply, it can be reduced to about 550g, which is about 1 / 18th, and at the same time, the balance of the center of gravity of the device can be significantly improved. It can be done easily, and because it is lightweight and stable, the installation safety can be greatly improved.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIG.

FIG. 3 is a characteristic diagram showing the change over time in the power consumption, which is an example of controlling so as to give the maximum high-frequency output for a fixed time after the start of heating. FIG. 3A shows the power consumption W1 + W2 of the entire microwave oven, which is constant regardless of time. Similarly, FIG. 3B shows electric power W1 consumed for electromagnetic wave oscillation from the magnetron 3, and the electric power consumption is high for a certain time (0 to t1) after the start of heating, so the electric power consumption is high, but t1 It has been low since then. FIG. 3C shows the other power consumption, which is the power consumption W2 of the cooling fan, the lamp, the turntable, etc., but the operation is stopped between 0 and t1 so as not to consume the power, and conversely, the high frequency power is consumed. After the time t1 when the output decreases, a certain amount of power is consumed for normal operation. In this embodiment, since t1 is constant, there is an effect that the control can be simplified.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG.

FIG. 4 is a characteristic diagram showing the change over time in the power consumption in the third embodiment of the present invention, and is an example in which the maximum high frequency output is controlled when the temperature of the magnetron 3 is below a certain temperature. FIG. 4A shows the power consumption W1 + W2 of the entire microwave oven, which is constant regardless of time as in FIG. 3A. FIG. 4B shows electric power W1 consumed for the radio wave oscillation from the magnetron. The electric power consumption is high at a certain time (0 to t2) after the start of heating because the maximum high frequency output is generated, but it is low after t2. Has become. FIG. 4C shows the other power consumption, which is the power consumption W2 of the cooling fan, the lamp, the turntable, etc., but the operation is stopped during 0 to t2 so as not to consume the power, and conversely, the high frequency power is consumed. After t2 when the output decreases, a certain amount of power is consumed for normal operation. FIG. 4 (d) shows the time variation of the magnetron temperature. The temperature at the start of heating is T1, the temperature upper limit for maintaining reliability is T3, and if the cooling fan 8 is rotated thereafter, the temperature can be saturated without exceeding T3. The limit is T2, and the time that exceeds T2 is t2. T
1, T2, T3 vary depending on which part of the magnetron 3 is captured, but when heating progresses and exceeds T2 (t
By lowering the high frequency output to 2) and starting the operation of the cooling fan, etc., the temperature rise is stopped. In this embodiment, there is an effect that a high frequency output can be efficiently supplied according to the reliability of the magnetron.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIGS.

FIG. 5 is a characteristic diagram showing the time change of the power consumption in the fourth embodiment of the present invention, which is an example in which the high frequency output is controlled to be gradually decreased from the maximum value. Figure 5 (a)
Represents the power consumption W1 + W2 of the entire microwave oven,
As in FIG. 3A and FIG. 4A, it is constant regardless of time.
FIG. 5B shows electric power W1 consumed for the radio wave oscillation from the magnetron. The electric power consumption is high for a certain time (0 to t3) after the start of heating because the maximum high frequency output is generated.
It gradually decreases after 3 and remains constant after t4. FIG. 5C shows other power consumption, which is power consumption W2 of the cooling fan, the lamp, the turntable, etc.
Between t3 and t3, the operation is stopped so that the power is not consumed, the power gradually increases after t3, and the constant power is consumed after t4 when the high frequency output is decreased.

FIG. 6 shows a method of determining t3 and t4 shown in FIG. 5, in which the horizontal axis represents the food weight m and the vertical axis represents the time t. There are various methods of cooking by determining the optimum heating time based on information from food,
As shown in FIG. 1, it is possible to determine the optimum heating time t5 (m) from a signal corresponding to the food weight m. At this time, in order to obtain a uniform finish at the end of cooking, the limit on when the turntable should be turned and whether the lamp should be turned on to make the progress visible to the user Is roughly decided. Based on such limit time, t
3 and t4 are set for each weight. In this embodiment, there is an effect that it is possible to more satisfy the user such as the quality at the end of heating and the confirmation of the progress, and to efficiently supply the high frequency output.

[0035]

As described above, according to the inventions described in claims 1 to 5, the fastest heating cooking by the maximum output, the realization of the cooking sequence to bring out the optimum cooking performance, and the weight saving of the equipment are realized. Installation performance and safety performance on the wall can be significantly improved.

[Brief description of drawings]

FIG. 1 is an installation diagram of a high frequency heating device with a range hood according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a power converter according to the first embodiment of the present invention.

FIG. 3A is a characteristic diagram showing the total power consumption of the high-frequency heating device, FIG. 3B is a characteristic diagram showing power consumption for the same radio wave oscillation, and FIG. 3C is a characteristic diagram showing power consumption other than the same radio wave oscillation. Figure

FIG. 4A is a characteristic diagram showing the total power consumption of the high frequency heating apparatus according to the second embodiment of the present invention, FIG. 4B is a characteristic diagram showing the power consumption for the same radio wave oscillation, and FIG. The characteristic diagram (d) showing the power consumption of the same is a characteristic diagram showing the temporal change of the magnetron temperature.

5A is a characteristic diagram showing the total power consumption of the high frequency heating apparatus according to the third embodiment of the present invention, FIG. 5B is a characteristic diagram showing the power consumption for the same radio wave oscillation, and FIG. Characteristic diagram showing the power consumption of

FIG. 6 is a weight-time characteristic diagram of the same high-frequency heating device.

FIG. 7: Installation diagram of a conventional high-frequency heating device with a range hood

FIG. 8 is a wall mounting structure diagram of a conventional high-frequency heating device with a range hood.

[Explanation of symbols]

1 heating chamber 2 power supply 2-1 High frequency heating device 2-2 Power converter having semiconductor element 3 ventilation means 4 First lighting means 6 Cooling means 7 Intake port 8 device body 9 Rotating means for high-frequency heated objects 10 Second lighting means 11 Other high-frequency heating products 12 Control unit (control means) 14 Waveguide 16 Drive unit for rotating means 17 Internal lighting hole

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H05B 6/68 310 H05B 6/68 310B 310Z 320 320A (72) Inventor Hirofumi Yoshimura 1006 Daimon Kadoma, Kadoma City, Osaka Prefecture Address Matsushita Electric Industrial Co., Ltd. (72) Inventor Fumihiko Migaki 1006, Kadoma, Kadoma, Osaka Prefecture F-Term (Reference) 3K086 AA03 AA05 BA08 CC02 CC06 CC07 CC11 DA02 DB11 DB17 3L086 AA07 AA20 BA05 BA10 BE13 CA04 CA16 CB20 CC07 CC15 CC16 DA01 DA19 DA24 DA29

Claims (5)

[Claims] 1. A high-frequency heating device provided on top of another heating and cooking device for cooking an object to be heated, a device body, a heating chamber for housing the object to be heated, and a heating means for cooking the object to be heated. Cooling means for cooling the heating means, an intake port for taking in generated gas generated from the other heating and cooking device, a ventilation means for exhausting air taken in from the intake port, an exhaust port for exhausting air, A high-frequency heating apparatus with a range hood, comprising: a power converter having at least one semiconductor element in the heating means and converting electric power into high-frequency power; and a control means for controlling the semiconductor element. 2. A power converter for converting electric power into high frequency power, a high voltage transformer for supplying a high voltage to a magnetron,
First and second capacitors connected to the primary side of the high-voltage transformer, a first semiconductor switching element connected to the first capacitor, and a second semiconductor switching element connected in series to the second capacitor , A drive circuit for driving the first semiconductor switching element and the second semiconductor switching element, and configured to alternately drive the first semiconductor switching element and the second semiconductor switching element. The high frequency heating device with a range hood according to claim 1. 3. The starting control means for controlling the control means so that the high frequency output becomes larger than the rated output in the steady state at the start of the heating operation, and the starting control means is provided with a timed element. The high-frequency heating device with a range hood according to claim 1 or 2, wherein the high-frequency output is controlled so that a high-frequency output larger than a rated output in a steady state is output for a predetermined time. 4. A first illuminating means for irradiating the heating chamber with light, a second illuminating means for irradiating another heating and cooking device installed below the device body with the light, and heating in the heating chamber. Rotating means for placing an object and performing an operation such as rotational movement, heating means for cooking an object to be heated, cooling means for cooling the heating means, ventilation means for exhausting air taken in from an intake port, It has the heating means, the first and second lighting means, the rotating means, the cooling means, and the control means B for controlling the ventilation means, and switches the high-frequency output of the heating means to a plurality of frequencies to output the maximum frequency. At the time of high power, either the first and second lighting means, the rotating means, the cooling means, or the ventilation means is stopped or operated so as to operate with low power, or 1 and 2nd illumination means, said The high frequency heating device with a range hood according to claim 3, wherein the heating output is controlled to be less than the maximum high frequency output when any of the rotating means, the cooling means, and the ventilation means is operating. 5. The high-frequency heating device with a range hood according to claim 3, wherein the maximum high-frequency output is supplied for a certain period of time after the start of heating.