JPS61216295A - High frequency heater - 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 Field of Industrial Application The present invention relates to a microcomputer and a display device.
The present invention relates to a high-frequency heating device equipped with a fluorescent display tube.

2. Description of the Related Art Conventionally, as shown in FIG. 6, an output signal 2a output from a microcomputer 1 provided in a high frequency heating device
, 2b, and the control content is specified using the keyboard 3, which is an input device, and the start key 31 is pressed to select 5CR.
4) The start key signal inputted to 41 turns on the main relay 5, which is the intermittent means, for the first time.

Describing this control procedure in detail, first select the control content using the keyboard 3, then press the start key 3a, and when the main relay 6 is turned on, a high signal (Star) OK is output from the output signal 2b. When the start key 3a is pressed, one of them becomes a start key signal and is input to the game 41L of 5CR4. Since the transistor 6b has already been turned on by the output signal 2b, the transistor 5CR4 is turned on. (It is latched.) In this state, the main relay is connected to the coil resistance 7 (R1).
5 is not turned on.

The signal is also input to the microcomputer 1 by the start key 3a, and after a certain delay time, the output signal 2
An active signal is output from IL, and transistor 6b
is turned on, and the main relay 5 is turned on.

Problems to be Solved by the Invention However, the method for controlling the main relay 5 that switches on and off the high frequency heating device configured as described above is certainly a safety circuit, but if the microcomputer 1 were to If a failure occurs and the output signals 2a and 2b become active, and 5CR4 is turned on due to noise or the like, the power relay 5 is activated and high-frequency heating is started. If there is food to be cooked in the cooking chamber, it will overheat and in the worst case scenario, it may catch fire, creating a very dangerous situation. In this way, since the control of the main relay 6 is performed independently of the fluorescent display tube 8a, which is a display device that allows the user to easily see the control contents, abnormalities in the control may not be noticed. .

Also, since two output signals from the microcomputer 1 are used to control the main relay 5, models that require a large number of inputs and outputs may use an expensive microcomputer with many inputs and outputs, or In order to increase output, ICs, etc. were added, which was a major factor in increasing product prices.

The present invention solves these conventional problems, and provides main relay control that is simple, safe, and easy for the user to see even in the event that a defect occurs. It is also possible to reduce costs.

Means for Solving the Problems The high-frequency heating device of the present invention controls the main relay, which is an intermittent means for turning on and off the high-frequency heating device, from a colon signal on a display device that the user can easily see, and from a microcomputer. It is constructed by the logical sum of the output signals.

Function The main relay for intermittent high-frequency heating operation of the high-frequency heating device of the present invention receives the output signals from the microcomputers 6--7', the colon signal of the display tube which is the display means, and the start key signal of the input device. Since it is turned on only by the logical sum, it has a triple safety circuit configuration.

In addition, one of the safety circuit configurations is the colon signal of the display tube, which is the display means, so the safety circuit configuration is maintained as long as there is no abnormality in the display, and if there is an abnormality in the display, Since the user visually notices the abnormality, it is possible to prevent accidents such as high-frequency automatic oscillation.

Furthermore, the main relay is disconnected after the high-frequency heating starts.
Control is very simple as it is controlled intermittently only by signals output from a microcomputer.

EXAMPLE Hereinafter, a high frequency heating device according to an example of the present invention will be explained with reference to the drawings. As shown in FIGS. 1 to 4, the microcomputer 1 in the electronic control device 24 provided in the high-frequency heating device 9 outputs an output signal 10a as a control signal for the relay.

10b, a scan signal 11 to the keyboard 3 which is an input device, an input signal 126 from the keyboard 3 to the fluorescent display tube control signal 13 which is output to the fluorescent display tube 8b which is a display device, and a buzzer 15. Buzzer signal 1 for
It is equipped with 4.

Here, the operation of the high frequency heating device 9 will be explained based on the main body circuit shown in FIGS. 2 and 4. When the door 17 of the high-frequency heating device 9 is closed, the latch SW 18 is inserted into the power supply line and turns ON and OFF in synchronization with the opening and closing of the door 17. The latch 5WB19 is in the ON state. In this state, when the menu on the keyboard 3 is selected and the start key 3a is inserted, the colon signal 2o of the fluorescent display tube 8b is turned off when the high-frequency heating device 9 is activated. The control of the microcomputer 1 at this time is as shown in FIG. 3. In the clock display mode, the colon signal blinks once per second to indicate the time, but during high-frequency heating operation or when the start key 3a is inserted next. When it is activated, the signal is always LOW. Therefore, the colon signal 20 is a LOW signal, and the inverter 2
When it passes through 1, it becomes High, and a High signal is input to the emitter of the transistor 6C. and start key 3a
When inserted at an angle of 7 degrees, one of them is input to the base of the transistor 6d, and the transistors ec and ea are both turned on instantly. The other signal is input as the input signal 12 of the microcomputer 1, and after a certain period of time, the output signal 1olL
A High signal is output as . Then, the transistor 6e is turned on, and the main relay 6, which is the disconnecting means, becomes VS2).
A current flows and the switch becomes ON.

At the same time, the output signal 10b is also output to the lamp relay 25, turning it on. Therefore, the open lamp 21 lights up, and the fan motor 22 that cools the magnetron 23, which is a high-frequency generator, operates and generates high-frequency waves.

In the case of defrosting cooking, high frequency oscillation is intermittent to defrost the food, but at this time it is sufficient to intermittent only the output signal 101L.

This is because the transistors sc and ea have a latch circuit configuration and are always in an ON state.

When cooking is finished, output signals 101L and 10b become LOW and main relay 5. The lamp relay 16 is turned off. Furthermore, since the fluorescent display tube 8b changes to the clock display mode, the colon signal 2o becomes the scan signal (High-L
ow), and the latch circuit constituted by the transistors 6c and ad enters the OFF state. To make the magnetron 23 oscillate when the fluorescent display tube 8b is displaying a clock, the output signal 10a from the microcomputer is used as a signal to operate the lamp relay 16 and the main relay 6. It is necessary to perform a logical sum between the Lot signal and the signal from the start key 3a of the keyboard 3.

Therefore, even if the microcomputer malfunctions, it is easy to
No power is supplied to the magnetron 23, making it a very safe configuration.

Furthermore, colon signal 2 is used to operate main relay 5.
Since 0 is used, there is no need to separately output a new signal from the microcomputer, so the output port of the microcomputer can be saved, and an inexpensive microcomputer can be selected.

92.2 In addition, since the colon signal from the fluorescent display tube is used as the condition for operating the main relay 5, the user can visually check whether there is an abnormality or not, so they can discover defects in advance. It is possible to prevent a fire caused by the automatic oscillation of the magnetron 23 to the object to be heated.

Effects of the Invention As described above, the main relay, which is a high-frequency heating on/off means for a high-frequency heating device equipped with a microcomputer and a fluorescent display tube according to the present invention, is capable of connecting the colon of the fluorescent display tube, which the user can easily see with the naked eye. It is turned ON only by the logical sum of the signal, the signal output from the microcomputer, and the signal input by the user directly pressing the start key on the keyboard, so it has a triple safety circuit configuration.

In addition, one of the safety circuit configurations is the colon signal of the display tube, which is the display means, so the safety circuit configuration is maintained as long as there is no abnormality in the display, and if there is an abnormality in the display, the user will be able to see it. Since you can notice the abnormality by looking at it, it is possible to prevent accidents such as high frequency automatic oscillation in advance. Furthermore, since the main relay is switched on and off after the start of high-frequency heating, it is controlled only by the signal output from the microcomputer, so control is very simple.

Furthermore, the control of the main relay described above involves signals with three different characteristics: the high signal and low signal output from the microcomputer, and the scan signal input by the user when the user presses the start key. The power relay is configured not to turn on at all even if the microcomputer fails.

Furthermore, since the colon signal is used in common to operate the main relay, there is no need to output a separate new signal from the microcomputer, which saves the output port of the microcomputer and allows you to select an inexpensive microcomputer, which improves safety and costs. It is extremely advantageous in terms of

[Brief explanation of drawings]

FIG. 1 is an electronic control circuit diagram of a high-frequency heating device according to an embodiment of the present invention, FIG. - The main body of the high-frequency heating device, and FIG. 6 is an electronic control circuit diagram of the conventional high-frequency heating device. 1...Microcomputer, 3...
Keyboard, 3a...Start key, 5...
...Main relay, 6.c, ad, 6a...Transistor, 7...Coil resistance, 8b...
... Fluorescent display tube, 1oa, 10b ... Output signal, 11 ... Scan signal, 12 ... Input signal, 13 ... Fluorescent display tube control signal , 25・
·····lamp. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 5--Mainly L-16'--Ranph Town L-f8--Lazonas 1-J'rA −) Ah

Claims (1)

[Claims] a heating chamber, a high-frequency generator that sends high-frequency waves into the heating chamber, an electronic control device that includes a microcomputer that controls heating of the high-frequency generator, and an input device that inputs control details of the high-frequency heating to the electronic control device. , comprising an intermittent means for intermittent output of the high frequency generator, and a display means for displaying high frequency heating information, the intermittent means comprising:
The ON state is first achieved by the logical sum of the colon signal of the display means, the start key signal of the input device, and the active signal output from the microcomputer, and the subsequent intermittent operation is output from the microcomputer to the intermittent means. A high-frequency heating device configured to be intermittently controlled only by signals.