JPS62190693A - Cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a cooking appliance, such as a microwave oven, which enables a heating output of yJ1.

(Prior Art) Conventionally, in a microwave oven, a magnetron is connected to the secondary coil of a transformer via an f8 voltage rectifier circuit consisting of a capacitor and a diode, and an AC mil! is connected to the primary coil of the transformer. There is a device in which a magnetron is caused to generate ff1ir+ by supplying voltage.

In this case, a switch is provided in the AC power supply voltage supply path to the primary coil of the transformer, and the desired heating output is obtained by turning this switch on and off at an arbitrary duty. We are trying to deal with things like low-power cooking. Then, the heating output is displayed in stages using, for example, a plurality of light emitting elements.

(Problems to be Solved by the Invention) However, since the heating output adjustment by turning on and off electricity as described above alternates between a state where the heating output is at maximum (full power) and a state where it is zero, This is not inherently desirable in terms of cooking quality.

Moreover, the heating output display as described above is only a guideline, and the reality is that it does not accurately notify the heating output. For this reason, the setting and adjustment of the heating output becomes rough, which further adversely affects the quality of cooking.

This invention was made in view of the above circumstances,
The purpose is to provide a highly reliable cooking device that enables easy and reliable setting and adjustment of heating output, and that consistently provides good quality cooking.

[Structure of the Invention] (Means for Solving the Problems) An inverter circuit that once converts AC power supply voltage into DC and then converts it into AC voltage of a predetermined frequency by switching and outputs it, and the output of this inverter circuit is boosted. and a magnetron that is rectified and applied, a heating output adjustment means that adjusts the heating output by controlling the output frequency of the inverter circuit, and a set value for the heating output adjustment means or the actual heating output during cooking. a display means for digital display; and f) a buzzing cooker.

(Function) When the heating output is set, an AC voltage with a frequency corresponding to the set value is output from the inverter circuit. Then, the output of this inverter circuit causes the magnetron to operate in oscillation, and dielectric heating cooking using high frequency radio waves is performed. At this time, the set value of the heating output or the actual heating output during cooking is digitally displayed on the display means.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a main body of a microwave oven. A door 2 is pivotally supported on the front surface of the main body 1 so as to be openable and closable, and an operation panel 3 is provided. The operation panel 3 is provided with a digital display section 4 and a key operation section 5. The digital display section 4 has a fluorescent display tube or a light emitting diode arranged in segments to display a multi-digit numerical value, and is capable of switching display between heating output and heating time.

Further, the key operation unit 5 is provided with a time/output setting knob 6, a group of cooking keys 1, a time/output switching key 8, a setting key 9, a cancel key 10, and the like. Note that each key is a touch key that can be operated simply by touching it with a finger.

The interrogation circuit is shown in FIGS. 3 and 4.

20 is a commercial AC power supply, and this ffi! Diode bridge 21 to 20. A rectifier circuit 24 consisting of a choke coil 22° for noise removal and a smoothing capacitor 23 is connected. A series resonant circuit consisting of a primary coil 25a of a transformer 25 and a capacitor 26 is connected to the output end of the rectifier circuit 24, and a collector of a switching element such as an NPN transistor 27 is connected to the capacitor 26.
The emitter and regeneration diodes (tamper diodes) 28 are connected in parallel.

On the other hand, the anode and cathode of the Magnemilon 32 are connected to the secondary coils 2511 of the lances 1 to 25 through a half-wave voltage doubler rectifier circuit consisting of a capacitor 29 and diodes 30 and 31. Then, the anode of the magnetron 32 is grounded, and the heater (cathode) is connected to a heater power source (not shown) via the transformer 33.

That is, the rectifier circuit 24. Primary coil 2 of transformer 25
5a and a capacitor 26.

Transistor 27 that excites this resonant circuit. and an inverter circuit (& formed by a mutual diode 2G,
Power is supplied to the magnetron 32 by this inverter circuit.

Reference numeral 40 denotes a control unit, which includes a microcomputer 41 and its peripheral circuits, and controls the drive of the transistor 21 and the display of the digital display unit 4 based on cooking conditions inputted from the key operation unit 5. It is.

Next, the operation in the above configuration will be explained.

First, I will explain about 8 cooking in 1 move.

Touch the time 7/output setting key 8 to set the time setting mode, and turn the time/output setting knob 6.

Then, the heating time corresponding to the rotation angle is sequentially displayed on the digital display section 4. At this time, by touching the setting key 9 when the desired heating time is displayed, the displayed heating time can be changed to the microcomputer 41.
is stored in the memory, and the heating time setting is completed.

Touch the time/output setting key 8 to set the output setting mode, and turn the time/output setting knob 6.

Then, the heating output corresponding to the rotation angle is sequentially displayed on the digital display section 4. At this time, by touching the setting key 9 when the desired heating output is displayed, the displayed heating output can be changed to the microcomputer 41.
is stored in the memory, and the heating output setting is completed. By operating the time/output key 8, it is possible to switch between the heating time display and the heating output display.

In this way, when the start key of the cooking key group 7 is touched after the setting of the heating time and heating output is completed, the microcomputer 41 turns on the transistor 21 with the on/off duty corresponding to the heating output setting value.
The inverter circuit outputs an alternating current voltage with a frequency corresponding to the heating output setting value to adjust the heating output.

At this time, the microcomputer 41 causes the digital display section 4 to display the actual heating output based on the ON/OFF driving of the transistor 27.

Thereafter, when a preset heating time has elapsed, the microcomputer 41 turns on the transistor 27.

Stop off drive. That is, the oscillation operation of the magnetron 32 is stopped and the cooking is completed.

On the other hand, myself! When carrying out the 1J01 process, it is sufficient to select the type of cooking by touching any key in key group 7, and then touching keys 1 to STAR. In this case, the heating time and heating output corresponding to the selected cooking are read from the memory of the microcomputer 41, and cooking is performed based on them. Then, the heating time and heating output are appropriately displayed on the digital display section 4.

In this way, by controlling the output frequency of the inverter circuit, the heating output is continuously adjusted steplessly, and the set value of the heating output or the actual heating output during cooking is digitally displayed accordingly. Therefore, it is possible to accurately notify the user of the heating output set value or the actual heating output during cooking. Therefore, the user can easily and reliably set and adjust the heating output, and in combination with the continuous adjustment section, the user can always cook to a good quality.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without changing the gist.

[Effects of the Invention] As described above, according to the present invention, there is provided a highly reliable cooking device that enables easy and reliable setting and adjustment of the heating output, and that enables consistently good quality cooking. can.

[Brief explanation of drawings]

FIG. 1 is an enlarged view showing the configuration of an operation panel in one embodiment of the present invention, FIG. 2 is an external perspective view of the same embodiment, and FIG. 3 is a diagram showing the configuration of a control circuit in the same embodiment. Fourth
The figure is a diagram showing a specific example of the main part in FIG. 3. 4...Digital display section, 5...Key operation section, 32
... Magnetron, 40... Control section. Applicant's agent Patent attorney Takehiko Suzue Φ ○

Claims (1)

[Claims] An inverter circuit that once converts AC power supply voltage into DC and then converts it into AC voltage of a predetermined frequency by switching and outputs it, a magnetron to which the output of this inverter circuit is boosted and rectified and applied, and the output of the inverter circuit. A cooking appliance comprising a heating output adjusting means that adjusts the heating output by controlling the frequency, and a display means that digitally displays the set value of the heating output or the actual heating output during cooking.