JPH0772618B2 - Cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a cooker provided with a magnetron for supplying high frequency radio waves into a cooking chamber.

(B) Conventional technology When using the above cooking device for business purposes, for example, the usage time is considerably longer than that for household use, and since it is used almost every day, it is unexpected by knowing the life time of the magnetron in advance. It is possible to prevent the work from being hindered by such a failure.

On the other hand, in the above cooking device, for example, as shown in JP-A-62-147223, cooking data such as heating time and heating temperature is stored.
There is one that stores in a memory that uses RAM, but when using RAM, a backup battery etc. is required, when storing original cooking data for business, when data is lost due to battery exhaustion Will be a big problem.

(C) Problem to be Solved by the Invention An object of the present invention is to easily check the life of a magnetron, a door switch, etc. by measuring and storing the oscillation time of the magnetron, the number of times the door is opened and closed, and the like.

(D) Means for Solving the Problems The present invention is directed to a cooking chamber that stores and heats an object to be cooked, a door that opens and closes a front opening of the cooking chamber, a magnetron that supplies high-frequency radio waves into the cooking chamber, and a cooking chamber. A display for displaying time, an input means for setting cooking time, etc., a measuring means for measuring and storing the energization time of the magnetron, the number of times of opening and closing of the door, etc., and generating a pulse in synchronization with the frequency of the AC power supply. A pulse generator circuit, a power failure detection circuit that counts the pulses from this pulse generator circuit to detect a power failure, and when the power failure is detected by this power failure detection circuit, the data of the measuring means is written to EEPROM and the stored data is measured after the power failure is restored. It comprises a memory setting means to be written in the means and a display setting means for displaying the memory data of the measuring means on the display by the setting input by the input means.

(E) Action The measurement means stores and stores the magnetron energization time, the number of times the door is opened and closed, etc. When a power failure occurs, the data stored in the measurement means is written to the EEPROM by the memory setting means, regardless of whether or not there is a power failure. The energization time of the magnetron can be continuously measured.

Further, by inputting the setting by the input means, it is possible to display the energization time of the magnetron on the display and check them.

(F) Example An example of the present invention will be described first with reference to FIG.
(1) is a microwave oven for business use, which defines a cooking chamber (2) inside, and a vertically opening door (4) is attached to the front opening (3) of the cooking chamber so that it can be opened and closed. ing.

Further, a combustion chamber (7) having a gas burner (6) is provided in the lower rear portion of the cooking chamber (2), and a blower chamber (10) having a circulation fan (9) accommodated behind the cooking chamber (2). Is formed into compartments, and the combustion hot air of the gas burner (6) is sucked into the blower chamber (10) by the rotation of the circulation fan (9), and then is circulated to the cooking chamber (2).

(11) is a turntable placed on the bottom of the cooking chamber (2) for placing an object to be cooked, (12) is a magnetron for supplying high-frequency radio waves for heating and cooking into the cooking chamber (2), (13) is a stirrer fan that supplies high-frequency radio waves emitted from this magnetron into the cooking chamber (2) while stirring, (14) is a temperature sensor that detects the temperature in the cooking chamber (2), and (15) is A circuit board for controlling the magnetron (12), the turntable (11) rotating gear motor (16), and the like, and (17) a power switch.

In FIG. 2, reference numeral (18) is an operation pulse attached to a suitable position on the front surface of the microwave oven (1), which is composed of a display (19) and a switch panel (20). Mainly composed of a digital display (21) for displaying cooking time, cooking temperature, etc., and a plurality of character displays (22) (22) for displaying operation states input from the switch panel (20). In addition, a plurality of key switches (23) (23), which are input means, are appropriately arranged on the switch panel (20).

FIG. 3 shows the control circuit mounted on the circuit board (15).
The key switches (23) (23), which form the input means, are connected to the input port of the microcomputer (24), the output port is the indicator (19), and the input / output port is of the electronic erase type. ROM (Read Only Memory) EEPROM (2
5) are connected respectively.

Further, the output (26) of the microcomputer (24) is a magnetron (12), the output (27) is a solenoid valve (28) for controlling gas supply to the gas burner (6), and the output (29) is a circulation fan. (9) are connected to each other, and the input (30) has a door switch (3) that opens and closes in conjunction with opening and closing of the door (4).
1) is connected.

(32) is a DC power supply circuit for the microcomputer (24), which is composed of a diode (33), a pair of constant voltage ICs (34), (35), and a plurality of capacitors (36) (37) (38). , 5V DC is supplied to the power supply terminal (39), and 12V DC is supplied to the power supply terminal (40). The constant voltage IC (35) includes a reset terminal (41) that outputs a reset signal when the power supply voltage drops, and this is connected to the reset input of the microcomputer (24).

On the other hand, (42) is a pulse generation circuit connected to the interrupter input (43) of the microcomputer (24), which is composed of a pair of transistor elements (44) (44) with resistance, and the interrupter input (43) is used as an AC power source. It is configured so that synchronized pulses can be obtained.

Further, the microcomputer (24) measures the oscillation time of the magnetron (12) by the output (26) and the number of times the door switch (31) is opened and closed by the input (30), and at the same time, for example, a built-in RAM (random access). The measuring means (45) to be stored in a memory such as a memory) and the number of pulses to the interrupter input (43) are counted to detect a power failure, and when a power failure occurs, it is stored in the RAM in the EEPROM (25). Existing data, and when power is restored
A memory setting means (46) for writing the data stored in the EEPROM (25) to the measuring means (45) is provided.

On the other hand, the memory setting means (46) detects the power failure by the number of pulses to the interrupter input (43) and then the capacitors (36) (37) of the DC power supply circuit (32) as shown in FIG.
It is written to EEPOM (25) during the discharge time of (38).

Incidentally, (A) in FIG. 4 is the waveform of the power supply circuit (32),
Similarly, (B) shows the output waveform of the part e, and the curves a to
d shows the output waveforms of parts a to d in FIG. 3, respectively (C)
(D) shows the waveform of the pulse generating circuit (42), and also shows the output waveforms of the f and g portions in FIG.
That is, in the case of the embodiment, the power failure is detected after the time (t1) when the input to the interrupter input (43) of the microcomputer (24) is not continuously input for two pulses (t1), and the EEPROM is started from this point.
After writing to (25), the output voltage of the constant voltage IC (35) drops by a specified amount below the specified power supply voltage (around 4.8V when the microcomputer power supply voltage is 5V), and resets after (t2) time Perform processing.

Further, the microcomputer (24) is provided with a display setting means (47) for displaying the data stored in the measuring means (45) on the display (19), and the display setting means allows the door switch (31) to operate. To check the number of times of opening and closing, for example, while pressing the menu key 1 (23g), turn the power switch (17) off
By turning it on, the digital display (21) will display the first digit in units of hundreds, such as "1425", for example 142500 times.
To see the oscillation time of the magnetron (12), hold down the menu key 2 (23h) and press the power switch (1
By turning 7) from OFF to ON, similarly, for example, "132" is displayed for 132 hours.

Then, when replacing the magnetron (12) and door switch (31), press the menu key 0 (23i) to set the display to 0, and then press the set key (23j), for example, in the above time and number of times display state. Are set to 0 respectively.

When cooking, the key switches (23) (23) of the switch pulse (20) are operated to microwave microwave cooking, high-speed oven cooking by burning the gas burner (6), and simultaneous use of these. Cooking is started by selecting overheated cooking and setting cooking time, cooking temperature, or automatic cooking selection.

In addition, in the case of the embodiment, in consideration of quickness of operation, in the case of automatic cooking, when the menu keys 1 to 0 are pressed, overheat cooking is started at the same time, and in the case of manual cooking, the timer key is used. After setting the cooking time by operating 10 minutes (23a), 1 minute (23b), and 10 seconds (23c), press the key (23d) (23e) (23f) on the microwave oven, high-speed oven, or simultaneous heating. ), The cooking is started at the same time as the selection.

On the other hand, for normal cooking, the oscillation time of the magnetron (12) and the opening / closing time of the door switch (31) are measured by the measuring means (45) and stored in the internal memory.

When the occurrence of power failure is detected as described above, the memory setting means (46) writes the data such as the oscillation time of the magnetron (12) measured by the measuring means (45) in the EEPROM (25). When the power failure is restored, this is detected and the above EEPR
The data such as the oscillation time of the magnetron (12) stored in the OM (25) is written in the measuring means (45), and the oscillation time and the like are continuously measured.

In the case of the embodiment, the EEPROM (25) is used to write the original cooking data for automatic cooking for business purposes, thereby preventing the loss of important cooking data due to a power failure.

(G) Effect of the Invention With the configuration according to the present invention, the oscillation time of the magnetron, which has a relatively short life, and the number of times the door switch is opened and closed can be measured and stored without being lost due to a power failure, and these can be checked at an appropriate time. By doing so, it is possible to prevent insufficient failures.

[Brief description of drawings]

FIG. 1 is a side elevational cross-sectional view of a partially broken view of the present invention, FIG. 2 is a front view of the same operation panel, FIG. 3 is a schematic configuration diagram showing the same control circuit, and FIG. 4 is a characteristic diagram thereof. (2) …… Cooking room, (3) …… Opening, (4) …… Door,
(12) …… Magnetron, (19) …… Indicator, (42)…
... Pulse generation circuit, (45) ... Measuring means, (46) ... Memory setting means, (47) ... Display setting means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuaki Tabuchi 3-201 Minamiyoshikata, Tottori-shi, Tottori Sanyo Electric Co., Ltd. (72) Inventor Soichiro Ohama 3-201 Minamiyoshikata, Tottori-shi Sanyo Tottori (56) References JP 62-147223 (JP, A) JP 63-75424 (JP, A) JP 54-163448 (JP, A) JP 58-193027 (JP , A) JP 54-80468 (JP, A) Actually opened 62-134103 (JP, U) Actually opened 59-165002 (JP, U)

Claims (1)

[Claims] 1. A cooking chamber for storing and heating an object to be cooked, a door for opening and closing a front opening of the cooking chamber, a magnetron for supplying high frequency radio waves into the cooking chamber, and an indicator for displaying cooking time and the like. Input means for setting cooking time, etc., measuring means for measuring and storing the energizing time of the magnetron, the number of times of opening and closing of the door, etc., a pulse generating circuit for generating a pulse in synchronization with the frequency of the AC power supply, and this pulse A power failure detection circuit that detects the power failure by counting the pulses from the generation circuit, and a memory setting that writes the data of the above measuring means to the EEPROM when the power failure is detected by this power failure detecting circuit and writes the memory data after the power failure is restored to the above measuring means. And a display setting means for displaying the stored data of the measuring means on a display by setting input by the input means.