JPH0353489A - Electromagnetic cooker - Google Patents

Abstract

PURPOSE:To facilitate the maintenance inspection and fault repair by comprising a counter for accumulating the number of generation of the abnormal condition per each items such as temperature, voltage and current, and a timer for accumulating the cooking operation time and a display for displaying the respective accumulated value. CONSTITUTION:When the abnormal condition is generated in an electromagnetic cooker 101, the number of generation is accumulated by a counter 102 per each items such as temperature, voltage and current, and the cooking operation time of the electromagnetic cooker 101 is accumulated by a timer 103, and the accumulated result of the counter 102 and the timer 103 is displayed by a display 104. Consequently, the use environment, frequency and condition can be known with the displayed content. A fault and a place which needs maintenance can be found easily, and replacement of parts such as a fan motor of which lifetime is limited is facilitated with the accumulated result of the operation time.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an electromagnetic cooker that heats using electromagnetic induction.

BACKGROUND OF THE INVENTION Conventional electromagnetic cookers are known to detect an abnormal state when it occurs and perform corresponding control. For example, one that increases the rotation speed of a cooling fan when the current increases (see Japanese Patent Laid-Open No. 61-208773), and one that prevents abnormal heating that occurs when a temperature probe comes off (see Japanese Patent Laid-Open No. 61-206195). )
, those that stop operation when a voltage higher than a predetermined value is applied (for example, see Japanese Patent Application Laid-Open No. 61168889), or those that stop operation due to excessive current (Japanese Patent Application Laid-Open No. 61-198).
1311491).

(C) Problems to be Solved by the Invention However, in such electric fMR equipment, is it possible to perform control corresponding to an abnormal state when it occurs? Since actual operating hours are not recorded, it cannot be used for maintenance or troubleshooting.

This invention was made in consideration of these circumstances,
By accumulating the number of occurrences of abnormal status records for each item and accumulating the cooking operation time, it is easy to grasp the situation such as the usage environment and frequency of use of the cooker from these values, and maintenance can be done accordingly. An object of the present invention is to provide an electromagnetic cooker that can be easily inspected and repaired.

(2) Means for solving the problem This invention monitors the temperature, voltage or tIi current of each part of the cooking appliance during cooking operation, and performs appropriate control when the deflection becomes abnormal. The configured electric@cooker is equipped with a counter that totals the number of occurrences of abnormal conditions for each item such as temperature, voltage, or current, a timer that totals the cooking operation time, and a display that displays each cumulative value. This is an electric @cooker with special features.

The counter and timer above are 8! Preferably, it is built into a microcomputer that controls the cooking device, and the cumulative results are stored in a non-volatile memory. Further, it is desirable that the memory contents can be read and rewritten by specific operations.

FIG. 1 is a block diagram showing the configuration of this invention, and lo
t monitors the temperature, voltage, current, etc. of each part of the cooking appliance during cooking operation, and is configured to perform appropriate control when they become abnormally low. I Science 2S,
102 is a counter that totals the number of occurrences of abnormal conditions for each item such as temperature, voltage, or current; 103 is a timer that totals cooking operation time; and 104 is a display that displays each cumulative value.

In addition, the 74 porcelain cooker +01 has a cooling fan that cools the control parts, a voltage sensor and a current sensor that detects the voltage and current of the control circuit, a temperature sensor that detects the temperature of the product, and so on. A safety circuit that detects when current flows and stops operation, a safety circuit that increases the rotation speed of the cooling fan when the circuit current exceeds a predetermined value, and an electric @
The counter 102 is equipped with a safety circuit that prevents abnormal heating when the cooking appliance's power sensor is disconnected, and a safety circuit that stops operation when a voltage higher than a predetermined value is applied to the control circuit.
is designed to accumulate the number of times each safety circuit operates.

(E) Effect In Figure I, Mfl? When an abnormal state occurs in the JX4 physical equipment 101, the number of times the abnormal state occurs is accumulated in the counter 102 for each item such as temperature, voltage, or current. Also,
The cooking operation time of the 1i magnetic cooking 5101 is accumulated by the timer 103. Then, since the cumulative results of the counter 102 and timer 103 are displayed on the display 104, the usage environment, usage frequency, usage conditions, etc. can be determined from the display contents, and failures and areas requiring maintenance can be easily discovered. Furthermore, based on the cumulative operating time results, it becomes easier to replace and maintain parts that have a limited lifespan, such as fan motors.

(f) Examples Hereinafter, the present invention will be described in detail based on examples shown in the drawings. This invention is not limited by this.

FIG. 2(a) is a perspective view of an electric appliance according to an embodiment of the present invention, in which numeral 1 denotes a table for placing a cooking container, and numeral 2 denotes an operation panel. FIG. 2(b) is a front view showing the details of the operation panel, where 3 is the keyboard, 4 is the display panel, 5 is the start key for starting cooking, and 6 is the course key 7 for selecting the cooking course. A timer key for setting cooking time, 8 a timer display for displaying the set cooking time, and 9 a course display for displaying the set cooking course.

FIG. 3 is a block diagram of the control circuit of the embodiment shown in FIG. 2(a), and IO is CPU. ROM (including non-volatile memory). RAM. A microcomputer (hereinafter referred to as a microcomputer) consisting of an I/O boat, 11 is provided at a location other than the operation panel 2, and is a maintenance key operated during maintenance, inspection, and repair. 12 is a key that applies high-frequency current to the heating coil 14 of the electromagnetic cooker. 13 is a cooling fan that cools the inverter circuit components, and 15 is a sensor that detects the load state of the Kashima coil. The microcomputer IO receives outputs from the keyboard 3, maintenance key 11, and sensor 15, and outputs them to the display panel 4, inverter 12, and fan 13. In addition, microcontroller 10
By operating the maintenance key 11, the non-volatile memory provided in the non-volatile memory displays its stored contents, that is, items and cumulative results, on the course display 9 and timer display 8 of the display panel 1, respectively.
The contents can be rewritten by operating . In such a configuration, an object to be heated (for example, an iron pan) is placed on the mounting table l, and the cooking course displayed on the course display 9 is selected by operating the course key 6 of the keyboard 3, and the timer display When the start key 5 is pressed after the cooking time displayed by the cooking timer 8 has been set using the timer key 7, the inverter l2
energizes the heating coil l4 with high frequency current, the heated object placed on the mounting table 1 is heated, and at the same time the fan l4 is heated.
3 is driven. Then, according to the set cooking course, the inverter l2 energizes the heating coil 14, and when the set cooking time has elapsed, the energization from the inverter l2 to the heating coil l4 is stopped, and after a predetermined time, the fan 14 is turned on.
3 stops.

In addition, if the heated object is removed from the mounting table I during cooking, this will be detected by the sensor 15, and during that period,
The timer of the microcomputer 10 stops measuring the cooking time. When the object to be heated is placed on the mounting table 1 again, this is detected by the sensor 15, and the cooking time timer restarts timing.

In this way, when the electric cooker is used, the heating time (actual operating time) and the driving time of the fan 13 are accumulated inside the microcomputer 10, and each is stored in the non-volatile memory. At the time of maintenance inspection or repair, when the maintenance key I1 is operated, information necessary for maintenance (maintenance information) stored in the non-volatile memory, such as fan drive time and cooker actual operation time, is displayed on the display panel 4. Then, if the cumulative operating time of the fan 13 has reached the life time (for example, 5000 hours),
After replacing the fan 13, the fan driving time stored in the nonvolatile memory is reset to 0 by operating the maintenance key 1l.

More detailed operations of this embodiment will be explained using flowcharts shown in FIGS. 4 to 7. First, the individual operations of each step are as follows.

St-1: Whether or not to execute St-7 and St-8 is determined by turning the remote switch ON or OFF.

Sl-2: Turn the mode switch ON to determine whether to execute Sl-8. Set it to OFF.

Sl-3: Data inside the microcomputer is backed up using a large-capacity capacitor, etc., and it is determined whether the voltage level of this capacitor, etc. has fallen below a specified value. Judgment result is N
If G (no), execute S1-4.

Sl-4: Clear the RAM area of data related to driving, etc. Data RA for ROM data timer time, etc.
Enter the M area.

Sl-5+ Displays timer time, course, etc. Perform key input processing and put the input key code into the RAM area.

'El-6: Determine the mode currently in operation and branch to each mode. Mode l-9 to proceed to each step below
2-1 Mode 2→S3-1 Mote 3→S4-1 Sl-7: Set the data to be set in advance in ROM. Data of each menu and menu No.
etc. SL-8: Clear part of the maintenance information.

S2-1: Count down the operating time of the cooling fan set at the end of the operation. Stop the cooling fan when this time reaches zero.

S2-2: In Sl-5, the manually pressed key is determined and the process branches accordingly.

In case of course key 182-4 In case of timer key →S2-5 In case of start key →S2-6 In case of maintenance key →S2-3 In case of no key power →St-5 (label CONT) S2
-3: Insert the first data of maintenance information into the display area of RAM. Set the mode to 3 to read the subsequent data.

S2-4+Course No. Set to +1. Course No.
．． is 1 to 8, and the course number is 1 to 8. If is 8, set the course number to 1.

S2-5 Increase the timer time by 5 seconds. This time is up to 9 minutes and 55 seconds, and the next time is 5 seconds.

S2-6: Set the driving flag and set the mote to 2 to enter the driving mode. Start driving the fan and start heating.

S2-7: Enter the time set in 52-5 of the course set in S2-4 into the driving time area of the RAM. Add this data to the display area.

S3-1: It is determined whether the key manually pressed in Sl-5 is the start key. If it is the start key, the process goes to S3-6 to stop the operation.

S3-2: It is determined whether the load is underloaded (no load). If the load is appropriate, the process goes to S3-3; if the load is too low, the process goes to S3-5, and the countdown in S3-3 is not performed.

S3-3 + Count down the operating time.

As a result of the countdown in S3-4 and S3-3, it is determined whether the timer has reached zero. If it is zero, S3-
6, otherwise go to S3-5.

S3-5: 93-3 countdown result in RAM
into the display area.

S3-6 +Reset the operation flag set in S2-6 and stop heating. Count the fan operation time by 5
Set to minutes. Set the operation mode to 1 and return to standby mode.

S3-7: Count the number of operations.

S3-8: Determine whether the number of consecutive rotations has exceeded 10. If IO times have passed, go to S3-9. Otherwise, go to S2-
Go to 7. As a result of the above, 63-9 is executed every 10 operations.

S3-9 +Write driving information such as driving timer and mincing information such as cumulative driving time and number of times to the non-volatile memory of the ROM.

S4-1: Same operation as S2-1 S4=2: Determine the key manually input in St-5 and branch to each step.

In the case of a course key - 84-3 Timer key 〃→S4-6 Maintenance key 〃→S4-5 In the case of key power or no key power → St-
．． a S4-3・Maintenance No. Add +1 to Changeover to Menothenanos Day Evening. For example, switch from displaying operating hours to displaying the number of operating times.

S4-4 Determine whether it is the final data of the mince information. If it is the final data, go to S4-5, otherwise go to S
・Go to 1-7.

S4-5: Change from maintenance mode to mode 1 standby mode.

94-6: Switch the digit of mince information. Also, prepare a display indicating which digit is currently being displayed.

In this example, the display is 3 digits long, and the maintenance information to be displayed requires 10 digits or more. For this reason, 2 to 4 times,
The display will be done by switching the digits.

S4-7: Enter the data determined in 54-3 and S4-6 into the RAM display area.

First, when the power is turned on, the operation starts from step Sl-1. It is set by a switching means such as a motor switch whether to execute initial l, initial 2, or not to execute either (Sl-1, l-2).
, l-7.1-8). Initial 1 initially presets menu data set in advance and executes Initial 2. Ininoyal 2 clears maintenance information.

In step Sl-3, the power is turned on. , it is determined whether or not the bank up power supply is normal when the bank up power supply is normal. Thereafter, the process goes to step Sl5 in the same way as when GO is determined in step Sl-3.

In step Sl-5, the course and time are displayed, and key manual input is performed at the same time as the display. This operation is similar to that of a conventional microcomputer-controlled microwave oven.

After that, the process goes to step S1-6. SteSob Sl6 performs mode determination and branching. Immediately after the power is turned on, the mode is 1, and the process branches to step S2-1.

Step S2-1 is a step for stopping the fan motor that started operating in step S3-6 after a predetermined period of time (for example, 5 minutes) when the operation in mode 2 is finished. This operation is not valid because the operation is not performed again and the fan motor is stopped. Next, go to step S2-2.

In step S2-2, the key is determined. Normally, no key is input, so the process returns to Step Sl-5. S1
Loop each step of -5, St-6, S2-1, and S22. If a key is input in step S1-5, the key force is determined in step S2-2, and the process branches.

First, assume that the course key is turned on at step SN-5.

A determination is made in step S2-2, and the process branches to step S2-4. Course No. but! When changed from 2 to 2, course No. is added by l. The display is prepared in S2-7 and described in steps S15, S1-6, S2-1 and 82.
-2 loop is displayed again.

Next, the timer key is input. It is determined in step S2-2 and the process goes to step S2-5, and the timer time is +5.
seconds. The timer time should be displayed as with the course key.

Furthermore, if the start key is pressed manually, the Stesop S2
-2 is determined, and the process goes to step S2-6.

Start driving at that step and set the mode to driving mode. Thereafter, the process goes through steps S2-7, S1-5, and St-6, and then goes from step St-6 to step S3-1.

In the operation mode, steps Sl-5, St-6, S3-I
Loop SS3-2, S3-3, 83-4, and S3-5.

In this mode, when the human power of the start key is received in step St-5, it is determined and branched in step S3-1,
The operation is stopped in step S3-6.

As a result of step S3-3, if the timer reaches zero, it is determined in step S3-4, and the process branches to step S3-6, where the operation ends.

If the maintenance key is determined in step S2-2, the process is executed in step S2-3, and this data is stored in step S1-
It should be displayed as 5. Since the mode is 3, the process goes from step S1-6 to 94-1.

At this time, steps St-S, S1-6, S4-1, S4~
2 loops are executed.

In this mode, use the course key to change the menu items, and use the timer key to switch the digits of the memo data (for example, total time, etc.)
Since 3 digits is insufficient, the number is displayed in 3-digit increments, and the digits are displayed using the decimal point display on the timer display section, etc.).

When the course key is operated manually, it is determined in step S4-2 and branched to step S4-3, and steps S4-4 to 64-7
Go to step Sl-5 and display. If the mince information is final, branching occurs in step S44, and the process proceeds to step S4-5.
The mode will change to 1 and it will go into standby mode (Figure 5). When the timer key is operated manually, it is determined in step S4-2 and the process branches to step S4-6. In step S4-6, digit switching and digit display are prepared, and the process proceeds to step S4-7.

This will be displayed below.

In addition, in this embodiment, if it is determined in step 53-2 that the load is small (no load), steps S3-3 and S3-4 are not executed, and therefore the countdown of the operating time set in the timer is This will not occur, and the display will not change (at this time of no load, the power is turned off and the heating operation is stopped).

In this way, it is a timer equipped! In a microprocessor, the timer stops when the load is removed and runs for the remaining time when the load is applied again.For example, when stirring food in the pot during cooking, the timer is Even if the cooker is removed from the cooker, the cooking time will not be measured during that time, and if the cooker is then returned to the pot, the heating operation will continue for the remaining time. Therefore, overall, the heating operation is performed for the initially set heating time, which provides the advantage of stabilizing the quality of the desired cooking.

(G) Effects of the Invention According to this invention, maintenance data such as usage time and number of abnormalities can be read out as needed, and the usage status can be easily estimated from this data, making repair or maintenance inspection work easier. This also shortens the time required.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of this invention, and FIG.
) is a perspective view showing one embodiment of the present invention, FIG. 2(b) is a front view showing the main part of FIG. 2(a), and FIG.
) is a block diagram showing the control circuit of the embodiment shown in FIGS.
FIG. 7 is a flowchart illustrating the main part of the operation of the embodiment shown in FIG. 2(a). ...Keyboard, 4...Display panel, 0.
...Microcomputer, l...1...Maintenance key 2...Inverter, 13...Fan, 4
・Heating coil, l5...Sensor Fig. 1 Fig. 2 (a) Fig. 2 (b) 4 Fig. Lemo k1 Lemo K2 Pupil ← Do 3 Also 7 by mode' Turning mode F Inte l4 Refill mode (Fig. 5) Refill mode (Fig. 6)

Claims (1)

[Claims] 1. In an electromagnetic cooker configured to monitor the temperature, voltage, current, etc. of each part of the cooker during cooking operation, and perform appropriate control when any abnormality occurs,
An electromagnetic cooker characterized by being equipped with a counter that totals the number of occurrences of abnormal conditions for each item such as temperature, voltage, or current, a timer that totals cooking operation time, and a display that displays each cumulative value. .