JP2022044872A - Induction heating cooker - Google Patents

Abstract

To provide an induction heating cooker capable of recording the operation status when an unexpected abnormal event occurs.SOLUTION: The induction heating cooker includes: a heating control circuit 202 that controls the energization of the heating means 201 to heat an object to be heated; control means 212 that controls the operation of the heating control circuit 202; a converter circuit 214 that supplies DC power supply to the control means 212; and overcurrent cutoff means 221 configured so as to, when overcurrent occurs, open the heating control circuit 212. the control means 212 includes power failure detection means 222 that is configured so as to, when the overcurrent cutoff means 221 opens the heating control circuit 202 or when the commercial power 210 stops, determine a power outage. The control means 212 includes power outage history storage circuit 223 is configured so as to, when the power failure detection means 222 determines a power outage, store the power outage history until the DC power supply supplied from the converter circuit 214 is cut off.SELECTED DRAWING: Figure 3

Description

The present invention relates to an induction heating cooker.

Conventionally, it is known that an induction heating cooker is provided with an abnormality history storage circuit, can store the contents at the time of occurrence of an abnormality, and can confirm the past abnormal contents (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2004-335266

In the induction heating cooker described in Patent Document 1, when at least one abnormal event assumed in advance occurs, it is detected, and the content of the abnormality is transmitted to the abnormality history storage unit by a communication circuit to store the abnormality history. I remember in. Therefore, when an unexpected abnormal event (for example, circuit failure) occurs in the induction heating cooker, an overcurrent occurs, and the breaker trips and a power failure occurs, no abnormality history remains and the abnormality occurrence status. It was difficult to reproduce and investigate the cause.

The induction heating cooker of the present invention has been made to solve the above-mentioned problems, and its uniform state is a heating control circuit for controlling energization of a heating means for heating an object to be heated and the heating control circuit. The control means includes a control means for controlling the operation of the control means, a converter circuit for supplying a DC power supply to the control means, and an overcurrent cutoff means for opening the heating control circuit when an overcurrent occurs. The overcurrent cutoff means includes a power failure detection means for determining a power failure when the heating control circuit is opened or the commercial power supply is stopped, and the control means is said when the power failure detection means determines a power failure. The induction heating cooker is equipped with a power failure history storage circuit that stores the power failure history until the DC power supplied from the converter circuit is cut off.

According to the present invention, when an abnormality that cannot be detected due to lack of a means for detecting or an unexpected abnormality occurs, an overcurrent flows due to a factor such as an overload or a short circuit, and the overcurrent is cut off or interrupted. Since information on the operating status when a power failure is detected when the breaker is activated remains, it is possible to reproduce the abnormal occurrence status and to easily investigate the cause of the abnormality.

It is external perspective view of the induction heating cooker which concerns on embodiment of this invention. It is a control block diagram of the induction heating cooker which concerns on embodiment of this invention. It is a flowchart which shows the control of an induction heating cooker from the commercial power supply which concerns on the Embodiment of this invention to the occurrence of a power failure, and the control means stop. It is a flowchart which shows the display operation of the power failure history stored in the power failure history storage circuit of the induction heating cooker which concerns on embodiment of this invention.

Hereinafter, examples of the present invention will be described with reference to the drawings and the like. The following description shows specific examples of the contents of the present invention, and the present invention is not limited to these descriptions. Various changes and modifications can be made by those skilled in the art within the scope of the technical ideas disclosed in the present specification, and it is planned from the beginning that the configurations of the following examples are appropriately combined. Further, in all the drawings for explaining the present invention, those having the same function may be designated by the same reference numerals, and the repeated description thereof may be omitted.

FIG. 1 is an external perspective view of an induction heating cooker according to an embodiment of the present invention. FIG. 2 is a control block diagram of an induction heating cooker according to an embodiment of the present invention. The cooker shown in FIG. 1, which will be described in detail below, is a built-in type induction cooking cooker in which pot mounting portions 6a, 6b, and 6c are provided at three locations on the top plate 3. In this embodiment, not a built-in type that fits into the kitchen but a stationary type induction heating cooker that is placed in the kitchen may be used.

The main body 2 of the induction heating cooker is incorporated by dropping it from the upper surface of the system kitchen 1 and installing it. After installation, the oven 11 and the operation panel 5, which will be described later, can be operated from the front portion of the system kitchen 1. The cooking pot, which is the object to be heated during cooking, is placed on the top plate 3 made of heat-resistant glass or the like arranged on the upper surface of the main body 2. The cooking pot can be cooked by being placed on the mounting portion 6 drawn on the top plate 3.

In the mounting portion 6, the mounting portion right 6a and the mounting portion left 6b are arranged on the front side of the top plate 3, and the mounting portion center 6c is located substantially in the center of the rear side between the two mounting portions 6a and 6b. Is arranged, and an annular mounting frame 19 indicating the range in which the cooking pot to be heated is placed is displayed on the mounting portion 6, and the cooking pot is placed in the mounting frame 19. The cooking pot can be heated efficiently. Then, in the lower part of the main body 2 corresponding to the pot mounting portions 6a, 6b, 6c of the top plate 3, the induction heating coil right 201a for heating the cooking pot, the induction heating coil left 201c, and the induction heating coil center 201b ( Figure 2) is installed respectively.

The central 6c of the mounting portion is a place that is difficult for the user to reach in terms of position. For this reason, the type of cooking performed at the center 6c of the placing portion is suitable for cooking that does not require the cook to move his / her hands so much, mainly for cooking such as boiling and heat insulation. In addition, since the output of boiling and heat retention is weak and the maximum power consumption is limited, the output of the induction heating coil center 201b installed in the center 6c of the mounting section is set to the right 6a of the mounting section and the left of the mounting section. It is set to be weaker than the induction heating coil right 201a and the induction heating coil left 201c installed corresponding to 6b, and the power consumption is reduced. Specifically, the induction heating coil right 201a and the induction heating coil left 201c are approximately 3 kW, and the induction heating coil center 201b installed in the mounting portion center 6c is approximately 1.6 kW.

In FIG. 1, a frame 14 for protecting an end face is provided around the top plate 3. The frame front 14a attached to the front upper edge of the top plate 3, the frame rear 14b attached to the rear upper edge of the top plate 3, the frame right 14c attached to the right upper edge, and the frame left attached to the left upper edge. It is composed of 14d. In this example, the frame is divided into 4 pieces, but it can be integrated, 2 pieces, or any number of pieces, and it is not necessary to attach it to the 4 sides of the top plate 3, only in front of the top plate 3 and only behind it. ， It may be only two sides before and after, or only two sides on the left and right.

Inside the main body 2, the induction heating coil right 201a, the induction heating coil left 201c, the induction heating coil center 201b, and electronic parts (not shown), which are the above-mentioned heat generating members, are provided to cool them. An intake port 7 for sucking air from the outside is provided on the right side of the upper surface of the rear portion of the main body 2. The intake port 7 is also located on the right side of the exhaust port 8 provided on the left side of the upper surface of the rear portion of the main body 2.

The air sucked through the intake port 7 is discharged to the outside of the main body 2 from the exhaust port 8 after cooling the induction heating coil right 201a, the induction heating coil left 201c, the induction heating coil center 201b, and electronic components that generate heat inside the main body 2. Will be done. Further, waste heat of the oven 11, which will be described later, is also discharged from the exhaust port 8 at the same time. The oven 11 is for baking fish, pizza, etc., and is arranged on the left side or the right side of the front surface of the main body 2 (left side in this embodiment), and the oven door 11a on the front surface allows a peek at the degree of baking inside. The oven door 11a is provided with a handle 20.

Reference numeral 9 is a top surface operation unit, which is composed of a plurality of switches and is provided in front of the frame 14a. Induction heating coil right 201a, induction heating coil left 201c, induction heating coil center 201b output adjustment, cooking timer setting, cooking It is possible to call up menus, set heat retention, simmered dishes, automatic rice cooking, fried food cooking, etc., and start and stop heating. Reference numeral 10 is a top surface display unit, which is provided on the front surface side of the top plate 3 along the top surface operation unit 9, and allows the user to understand the output setting, cooking menu, timer value, cooking temperature, etc. set by the top surface operation unit 9. Display easily.

An open / close / retractable operation panel 5 is provided on the front surface of the main body 2 on the left side or the right side (right side in this embodiment) of the main body 2. The operation panel 5 mainly operates the oven 11, and is provided so as to be located next to the oven 11.

Further, the lock device (not shown) of the operation panel 5, which is an open / close operation unit, is released by pushing the upper part toward the main body 2 side when the operation panel 5 is closed, and the upper part of the operation panel 5 is slowly moved toward the front side by a spring. When it is closed, it is stored in the main body 2 by pushing the upper part toward the main body 2 side, and is held by the lock device. The operation panel 5 is provided with a front operation unit 5a as an input means, and inputs power to / from the heater 201d of the oven 11 and a cooking method of cooked food from a menu or the like. The input information input by the front operation unit 5a is displayed in an easy-to-understand manner by the user on the front display unit 5b, which is a display means. Above the operation panel 5, a power off / on switch 12 for turning on / off the main power of the main body 2 of the induction heating cooker is provided.

As shown in FIG. 2, the line of the commercial power supply 210 of the main body 2 is provided with an overcurrent cutoff means 221 equipped with an overcurrent cutoff circuit, and when an overcurrent occurs, the control circuit is opened to cause an accident. prevent. The cause of the overcurrent in the control circuit is that the current originally supplied from the heater control circuit 202d so as to pass through the heating wire inside the heater 201d is inside the heater 201d due to a malfunction of the heater 201d or the like. The current supplied from the inverter circuit (202a, 202b, 202c) so that it flows without passing through the heating wire or originally passes through the induction heating coil (201a, 201b, 201c) is induced heating due to a malfunction of the switching element or the like. It is conceivable that the current flows without passing through the coils (201a, 201b, 201c).

Further, in the line of the commercial power supply 210, a filter means 211 equipped with a filter circuit is provided to suppress noise generated from the inverter circuits (202a, 202b, 202c), and the noise noise leaks to the commercial power supply 210. prevent. The commercial power supply 210 is connected to the converter circuit 214, and the converter circuit 214 generates a DC power supply having a voltage necessary for controlling the control means 212 and supplies the DC power supply to the control means 212. Further, the commercial power supply 210 is also connected to the commercial power supply monitoring means 224, and the commercial power supply monitoring means 224 generates an analog signal corresponding to the voltage of the commercial power supply and a power supply synchronization signal synchronized with the cycle of the commercial power supply, and is used as the control means 212. input.

The control means 212 configured by the microcomputer receives input information input from input means such as the front operation unit 5a and the top surface operation unit 9 provided on the operation panel 5, and receives input information input from the front surface display unit 5b and the top surface display unit which are display means. The display signal is output to 10. Further, the control means 212 outputs a control signal to the heater control circuit 202d to control the energization of the heater 201d, which is a heating source, or outputs a control signal to the inverter circuits 202a, 202b, 202c according to the input information. It controls the electric power supplied to the heating coils 201a, 201b, and 201c.

The control means 212 includes a power failure detecting means 222 that receives an input from the commercial power supply monitoring means 224 and detects the occurrence of a power failure. Further, the control means 212 is connected to a notification unit 213 that informs the user of how to use the device, the end of cooking, etc. by music or voice, and a power failure history storage circuit 223, which will be described later.

Next, the operation of the embodiment will be described with reference to FIGS. 3 to 4. FIG. 3 is a flowchart showing the control of the induction heating cooker from the commercial power supply according to the embodiment of the present invention to the time when a power failure occurs and the control means stops. FIG. 4 is a flowchart showing a power failure history display operation stored in the power failure history storage circuit of the induction heating cooker according to the embodiment of the present invention.

As shown in FIG. 3, when the commercial power supply 210 is supplied to the induction heating cooker (step 305, the step of turning on the commercial power supply 210), the converter circuit 214 generates a DC power supply having a voltage necessary for controlling the control means 212. , Supply to the control means 212 (step 306, step of generating and supplying DC power). When the DC power is supplied to the control means 212, the control means 212 is activated (step 307, a step of activating the control means). After activating the control means 212, when the predetermined switches of the front display unit 5a and the top display unit 9 which are the input means are operated to start cooking (step 308, the step of starting cooking), the power failure detecting means 222 is commercialized. It receives the input from the power supply monitoring means 224 and monitors the supply status of the commercial power supply 210. The effective value of the commercial power supply voltage obtained from the analog signal corresponding to the voltage of the commercial power supply 210 may be the data corresponding to 0V or the commercial power supply may be obtained by stopping the commercial power supply 210 or opening the control circuit by the overcurrent cutoff means 221. If the power supply synchronization signal synchronized with the power cycle is not synchronized with the power supply cycle, it is determined that a power failure has occurred.

At this time, the commercial power supply 210 is not supplied to the converter circuit 214, but the electric charge stored in the capacitor in the converter circuit 214 remains, and the DC power supply continues to be supplied to the control means 212 for a certain period of time. From the time when the power failure detecting means 222 detects the occurrence of a power failure to the time when the supply of the DC power supply from the converter circuit 214 is stopped, the control means 212 stores the power failure history in the power failure history storage circuit 223 in chronological order (step). 311 Step to store the power failure history). The power failure history includes information on the operating status such as voltage, current, output setting, cooking menu, cooking time, cooking temperature, various sensor values, occurrence time, and cumulative number of times of energization at the time of power failure. Since the supply of the commercial power supply 210 is stopped, after the power failure history is stored, the supply of the DC power supply from the converter circuit 214 is also stopped (step 310, the step where the supply of the DC power supply is stopped), and the control means 212 is accompanied accordingly. Also stops (step 311 the step at which the control means stops).

As shown in FIG. 4, when a predetermined switch of the front display unit 5a and the top display unit 9 which are input means is turned on except during cooking, the power failure history display mode is set and the front display unit 5b and the top display which are display means are displayed. The latest power failure history is displayed in the unit 10 (step 312, the step of displaying the latest power failure history). When the specified switch is turned on in the power failure history display mode, the power failure history that occurred immediately before the currently displayed power failure history is displayed (step 313. The power failure history that occurred immediately before the displayed power failure history). Step to display). When a predetermined switch is turned on in the power failure history display mode, the power failure history display mode is terminated and the power failure history display is turned off (step 314, the step of turning off the power failure history display).

As described above, according to the embodiment of the present invention, the power failure history can be stored in chronological order when a power failure occurs. Then, by operating a predetermined switch, the stored power failure history can be displayed in chronological order. Therefore, by confirming the operating state at the time of a power failure, it is possible to provide an induction heating cooker that makes it easy to investigate the cause of the abnormality.
The present invention is not limited to the above-described embodiment, and includes various modifications. The above-mentioned examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations.

1 System kitchen 2 Main body 3 Top plate 5 Operation panel 5a Front operation unit 5b Front display unit 6 Mounting unit 7 Intake port 8 Exhaust port 9 Top surface operation unit 10 Top surface display unit 11 Oven 11a Oven door 12 Power off / on switch 14 Frame 19 Mounting frame 20 Handle 201 Heating means 201a Induction heating coil right 201b Induction heating coil left 201c Induction heating coil center 201d Heater 202 Heating control circuit 202a Inverter circuit right 202b Inverter circuit left 202c Inverter circuit center 202d Heater control circuit 210 Commercial power supply 211 Filter means 212 Control means 213 Notification unit 214 Converter circuit 221 Overcurrent cutoff means 222 Power failure detection means 223 Power failure history storage circuit 224 Commercial power supply monitoring means

Claims (1)

A heating control circuit that controls the energization of the heating means that heats the object to be heated,
A control means for controlling the operation of the heating control circuit and
A converter circuit that supplies DC power to the control means,
It is provided with an overcurrent cutoff means for opening the heating control circuit when an overcurrent occurs.
The control means includes a power failure detecting means for determining a power failure when the overcurrent cutoff means opens the heating control circuit or the commercial power supply is stopped.
The control means is an induction heating cooker provided with a power failure history storage circuit that stores a power failure history until the DC power supplied from the converter circuit is cut off when the power failure detecting means determines that the power failure occurs.

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