JPS6119372Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronically controlled cooking device equipped with a plurality of heating means.

BACKGROUND ART Cooking devices that can select between heating using microwaves and heating using a heater, so-called microwave ovens, are becoming popular. On the other hand, microwave ovens equipped with microcomputers that can automatically perform a wide variety of cooking operations with simple operation have been put into practical use.
In the case of a microwave oven equipped with a microcomputer,
In order to monitor the progress and completion of cooking, it is not necessary to measure the temperature of the food to be cooked, and a temperature probe configured to be inserted into the food is used. By the way, it is desirable to measure temperature even in a microwave oven equipped with an oven function, that is, a so-called microwave oven that has a microwave heating means and a hot air heating means, but in such an open oven, the above-mentioned temperature probe cannot withstand the heating of the heater. However, there was a problem in that it could not be used in the same way as a microwave oven.

The present invention was developed in view of the above circumstances.The temperature probe is detachable from the wall of the cooking chamber, and the microcomputer is equipped with a system that distinguishes between the selected heating means and whether the temperature probe is attached or detached. Furthermore, an electronically controlled cooking appliance is proposed which is configured to prohibit heating of the heater or issue an alarm if a temperature probe is attached during heating of the heater.

The present invention will be described in detail below with reference to drawings showing embodiments thereof.

FIG. 1 is a schematic structural diagram of a cooking device according to the present invention (hereinafter referred to as the device according to the present invention), in which a magnetron 11 as a microwave heating means and a waveguide 13 for guiding microwaves to a cooking chamber 12 are installed on the side of the device. is,
Further, a heater 14 as a hot air heating means is provided above the cooking chamber 12, and heat generated by the heater is placed in the cooking chamber 12.
A fan 15 is provided for feeding the inside.

On the front of the body where the magnetron 11 is stored is the second
As shown in the figure, a keyboard 16 consisting of a numeric keypad and function keys, and a display device 17 are provided, and the keyboard 16 is equipped with a microcomputer (hereinafter referred to as microcomputer) that is housed behind these and functions as the control center of the device. The display device is used to display key-in contents, control progress status, alarm display, time display, etc.

A plug jack 18 as shown on an enlarged scale in FIG. 3 is attached to the wall surface of the cooking chamber on the side where the keyboard 16 and the like are attached, that is, the right wall surface. This plug jack 18 is provided for inserting and removing the plug 1c of the temperature probe 1, that is, for attaching and detaching the temperature probe 1, and is provided with a common terminal 18c, a normally closed terminal 18b, and a normally open terminal 18a. The conductor of the plug and the terminal 18b are connected so that the terminals 18c and 18b are in contact with each other, and when the plug is inserted, there is an open circuit between the terminals 18c and 18b, and a thermistor as a temperature sensing element is interposed between the terminals 18b and 18a.
18a are in contact with each other. The temperature probe 1 has the above-mentioned thermistor built-in, and has a sharp temperature-sensing part 1a at the tip that can be easily inserted into the food to be cooked, and a flexible part that covers the lead wire between it and the plug 1c at the base end. A cylindrical body 1b is arranged.

FIG. 4 schematically shows the circuit around the microcomputer 2. Data generated by keystrokes on the keyboard 16 is taken into the microcomputer 2. Also display device 1
The data to be displayed on the microcomputer 7 is given from the microcomputer 2. H ₀ to _{H 4} are output ports of the microcomputer 2, and when microwave heating is performed by driving the magnetron 11, output appears at ports H ₀ and H ₂ ,
When hot air heating is performed by energizing the heater 14, outputs appear at ports H ₁ and H ₂ . When an output appears at the port _H0 , the transistor 81 whose base is connected to this turns on, and the light emitting diode 82 connected to the collector of the transistor 81 is energized. This light emitting diode 82 constitutes a photocoupler interposed to insulate the control circuit shown in FIG. 4 from the magnetron excitation power supply circuit to be controlled by the control circuit, and a phototransistor paired with the photocoupler. (not shown) is configured to control on/off of the switching triax of the power supply circuit.
The same thing is done for the heater port _H1 .
Port _H3 outputs an output when hot air is heated, and the output operates a damper to flow air between the wall of the cooking chamber 12 and the outer wall of the vessel. Board _H4 outputs an output for driving the notification buzzer 21 at the end of heating.

Port _A2 is an input port for detecting the opening/closing of a door (not shown), and detects the opening/closing of the door by the level change caused by the operation of the switch 22, which opens and closes according to the opening/closing of the door, and prohibits heating when the door is opened. control.

Port A ₃ is an input port for detecting attachment/detachment of temperature probe 1. When plug 1c is inserted, terminals 18c and 18b are opened, so port A ₃
becomes the low level of -Vcc, and when the plug 1c is not inserted, the terminals 8c and 18b are closed as shown in the figure and become the high level of the ground potential. This allows the microcomputer 2 to identify whether the temperature probe 1 is attached or detached.

Ports _R0 to _R7 are output ports for outputting 8-bit binary signals for generating reference voltages for temperature measurement.

Port _A0 is an input port for temperature detection during microwave heating, and the temperature of the food is determined by comparing the voltage determined by the resistance value of the thermistor 1d in the temperature sensing part 1a of the temperature probe 1 with the above-mentioned reference voltage. Detected.

Port _A1 is an input port for temperature detection during hot air heating, and the voltage determined by the resistance value of the thermistor 23 installed on the wall or exhaust port of the cooking chamber 12 is compared with the above-mentioned reference voltage. It detects the internal temperature.

FIG. 5 is a flowchart showing part of the control of the microcomputer 2. If the door is closed, microwave heating is instructed, there is no timer operation instruction, and temperature probe 1 is attached, temperature measurement by temperature probe 1 and temperature measurement results by display device 17 are performed. The magnetron 11
is driven (excited) to start microwave heating.

If the door is open, magnetron 1
1. Prohibit driving of both heaters 14.

In the next step, the identification of whether or not it is microwave heating is done based on key input or the internal state of the microcomputer, so if it is not microwave heating, it is determined whether or not it is timer operation, and the timer operation is started. In this case, if the temperature probe 1 is not installed, the timer's time is displayed on the display device 1.
7 and the STOP key is pressed,
Heat the heater until the timer runs out of time.

However, in the case of not microwave heating and timer operation, in other words, if the temperature probe 1 is attached in a situation where heater heating can be performed, heater heating is prohibited. Then, a portion 17' provided in the display device 17 corresponding to the temperature probe is made to blink. With these measures, the temperature probe 1 can be protected from high temperatures caused by heater heating, and the blinking display will remind the user to remove the temperature probe 1.

If the CLEAR key on the keyboard 16 is pressed, it will go into a standby state, but the CLEAR key will not be pressed and it will mistakenly instruct to start heating.
If the STRT key is pressed, the process returns to the previous step.

If the heater does not heat up, or if the display device 17 blinks and you notice the temperature probe device and remove it from the plug jack 18, the microcomputer 2 will input it to port _A3 by contacting the terminals 18c and 18b. is detected, the state is set to enable heating by the heater 14, and the display device 1
7 stops blinking.

In this way, the cooking device of the present invention has a plurality of heating means that can be used selectively, a detachable temperature probe for measuring the temperature of the food being cooked, and a temperature probe that can be attached or detached depending on the selected heating means and the temperature probe. a means of identifying;
Based on the identification result, it is equipped with a control means that prohibits the operation of the selected heating means or issues an alarm, so there is no risk of inadvertently damaging the temperature probe, and contact measurement is also used in microwave ovens. You can introduce warm-type temperature probes with confidence.

In the above-mentioned embodiment, heating of the heater is prohibited and a warning is issued by blinking the display device, but it is also possible to have a configuration in which only prohibiting heating of the heater or only driving an alarm means with sufficient alerting power. good. The present invention can also be applied to cooking devices that use microwaves and gas combustion heat as heating means.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic structural diagram of the proposed device, Fig. 2 is a front view of a keyboard display device, Fig. 3 is a structural explanatory diagram of a temperature probe and a plug jack, FIG. 4 is a schematic circuit diagram around the microcomputer, and FIG. 5 is a flowchart showing the control mode by the microcomputer. 1...Temperature probe, 2...Microcomputer, 11...
... Magnetron, 12 ... Cooking chamber, 14 ... Heater, 16 ... Keyboard, 17 ... Display device, 1
8...Plug jack.

Claims (1)

[Scope of utility model registration request] A plurality of heating means that can be selectively used, a detachable probe for measuring the temperature of food, a means for identifying the selected heating means and whether the temperature probe can be attached or detached, and based on the identification result. 1. An electronically controlled regulator comprising: a control means for prohibiting driving of a selected heating means or for issuing an alarm.