JP2011058716A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating cooker capable of performing maintenance in safety by being connected to a commercial power source of a voltage lower than rated voltage. <P>SOLUTION: When an AC power source of 100V lower than 200V of the rated voltage is switched on, a DC power source is kept on until the AC power source is switched off and continuously applies output voltage of 5V to a control section, as an allowable range of AC voltage is widened. In a case when a door is opened at a clock time T0, a primary interlock relay contact is not switched on, and an oven lamp and an antenna motor are kept off, as the voltage of the AC power source is 100V. In a case when an operation for setting a recipe is performed from an operating section at a clock time T1, the recipe is registered. In a case when an operation for starting demonstration is performed from the operating section at the clock time T1, a heating relay contact is not switched on, and a fan motor and an exhaust motor are respectively switched on. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heating cooker that has a heat source such as a microwave and an electric heater and cooks an object to be heated in a heating chamber.

  In recent years, a cooking device using a microwave and / or an electric heater as a heat source has been widely used. Especially for business use among heating cookers, it is easy to select a recipe suitable for the object to be heated from a plurality of preset recipes (combination of heating time and heating output according to the type and amount of the object to be heated) It is important to be able to cook, and what is considered to be able to finish cooking in a short time with a powerful firepower is provided.

  For example, Patent Document 1 discloses a microwave oven that stores cooking time, finished food temperature, and microwave output set by a user and can call the stored contents as a cooking program. Patent Document 2 discloses a microwave oven including two magnetrons having independent cooling paths.

  The above-described cooking program, that is, a recipe, is stored with different contents set for each normal user (for business use, for example, a franchise chain), but in some cases, more than a hundred cooking programs such as kitchens are stored. Setting at the installation location is not realistic, and it is desirable that it can be set at a base such as a store or a service store.

  On the other hand, in a microwave oven having a high heat output including two magnetrons, a commercial power source for power having a higher rated voltage than a commercial power source for general households is required. In such a microwave oven, at a base such as a store or a service store that does not have a commercial power supply facility for power, it is not possible to perform a maintenance such as setting a recipe by properly turning on the power of the rated voltage. It is a difficulty.

Japanese Utility Model Publication No. 56-170602 Japanese Patent Laid-Open No. 5-322187

  However, even in a microwave oven with a high rated voltage, for example, depending on the characteristics of the built-in DC power supply, it may be possible to operate the key by connecting to a commercial power supply for general households. When performed, there was a risk of damage to the human body due to equipment damage.

  This invention is made | formed in view of such a situation, The objective is to provide the heating cooker which can be connected to the commercial power source of a voltage lower than a rated voltage, and can be maintained safely. is there.

  The heating cooker according to the present invention includes a heating cooker including a heating unit that heats an object to be heated with electric power supplied from a connected commercial power source, and means for detecting the voltage of the commercial power source. Determination means for determining whether or not the determined voltage value is lower than a predetermined voltage value, and means for prohibiting the supply of power to the heating unit when the determination means determines that the voltage value is lower than the predetermined voltage value. It is characterized by that.

In the present invention, when the voltage of the connected commercial power supply is lower than a predetermined voltage, the supply of power to the heating unit is prohibited.
Thereby, for example, even when connected to a commercial power supply for general households lower than the rated voltage, when heating is started for some reason, the heating unit to which a voltage lower than the rated voltage is applied fails. And an unexpected large current is prevented from flowing into the heating section.

  The heating cooker according to the present invention stores in advance a storage unit that stores a simulated cooking recipe simulating cooking by the heating unit, and the determination unit determines that the determination unit is lower than a predetermined voltage value. And a means for accepting an operation for starting simulated cooking by a recipe.

In the present invention, a recipe for simulated cooking imitating cooking by the heating unit is prepared and stored in advance, and when it is determined that the voltage of the connected commercial power source is lower than the predetermined voltage, the stored recipe is stored. The operation for starting the simulated cooking is accepted.
Thereby, for example, in a place such as a store, a delivery destination office, a waiting room, etc., it is possible to perform a demonstration showing the flow of cooking to the customer without actually heating the object to be heated by the heating unit. .

  The heating cooker according to the present invention is characterized by comprising means for accepting an operation for setting a recipe regardless of the determination result of the determination means.

  In the present invention, in order to accept an operation for setting a recipe regardless of whether or not the voltage of the connected commercial power supply is lower than a predetermined voltage, when the set recipe is to be stored, It is possible to set and register a cooking program as a recipe in advance not only at the installation location of the kitchen or the like, but also at the store, the delivery destination office, the waiting room, or the like.

According to the present invention, even when connected to a commercial power supply for general households that is lower than the rated voltage, a voltage lower than the rated voltage is applied to the heating unit and a failure occurs, and an unexpectedly large current is applied to the heating unit. In order to prevent the inflow of water, there is no risk of damage to the human body due to equipment damage.
Therefore, it can be safely maintained by connecting to a commercial power supply having a voltage lower than the rated voltage.
In addition, when a DC power supply that enables control such as operation acceptance regardless of the voltage of the commercial power supply is built-in, for example, it is necessary to open the microwave oven housing for switching the power transformer tap. In addition, since the live parts are not exposed, maintenance can be performed more safely. Microwave ovens have a built-in high voltage generator, and opening the housing increases the possibility of electric shock and other injuries, so even maintenance personnel with sufficient technology can open the housing as much as possible. It is desirable not to.

It is a front view which shows the external appearance of a microwave oven. It is a schematic plan view which shows the internal structure of a microwave oven. It is a simplified rear view showing the internal configuration of the microwave oven. It is a schematic left view which shows the internal structure of a microwave oven. It is a simplified right view which shows the internal structure of a microwave oven. It is explanatory drawing which shows the external appearance of the operation part distribute | arranged to the range main body of a microwave oven. It is explanatory drawing which shows the external appearance of the operation part distribute | arranged to the door of the microwave oven. It is a block diagram which shows the principal circuit structure of a microwave oven. It is a timing chart which shows the relationship of the operation state of each component shown in FIG. It is a flowchart which shows the process sequence of CPU which memorize | stores the detection result of the voltage of AC power supply, and detects opening and closing of a door. It is a flowchart which shows the process sequence of CPU which receives the setting of recipe setting, memory | storage, selection, and the start of simulation cooking. It is a flowchart which shows the process sequence of CPU which receives the setting of recipe setting, memory | storage, selection, and the start of simulation cooking. It is a flowchart which shows the process sequence of CPU which receives the setting of recipe setting, memory | storage, selection, and the start of simulation cooking. It is a flowchart which shows the process sequence of CPU which stores the key information for specifying the pressed key in a key buffer. It is a flowchart which shows the process sequence of CPU which concerns on the key input subroutine.

  Hereinafter, an embodiment in which the present invention is applied to a microwave oven will be described in detail. FIG. 1 is a front view showing an appearance of a microwave oven, and FIGS. 2 to 5 are a schematic plan view, a schematic rear view, a schematic left side view, and a schematic right side, each showing an internal configuration of the microwave oven. FIG.

  In the figure, reference numeral 1 denotes a range body. The range body 1 has a substantially rectangular parallelepiped shape, and a cabinet 7 that houses a heating chamber 6 having an open portion on the front side is used as an outer shell. The open portion is closed so as to be openable and closable by a laterally open door 2 hinged to one side of the front portion of the range body 1. The upper part of the front surface of the range body 1 protrudes forward so as to cover the upper side of the door 2, and operations such as recipe selection and start of heating are performed on the front part of the protruded range body 1 and the lower part of the door 2. Are provided with operation sections 3 and 4, respectively.

  The cabinet 7 has a base 21 having a rectangular shape, a frame-shaped front frame 22 coupled to the front edge of the base 21, a side plate, a top plate, and a back plate. And a cover body 23 that covers the periphery of 22. The heating chamber 6 is attached to the front side of the base 21.

  The door 2 is supported by a hinge pin 2b fitted on a hinge 2a (the lower side is not shown) arranged on one side of the front frame 22, and on the other side of the front frame 22, the door 2 A door switch 2c for detecting opening / closing of the door is disposed.

  Two high-frequency generators (hereinafter referred to as magnetrons) 8 and 8 for generating microwaves for cooking are arranged in the center behind the heating chamber 6 so as to be separated from each other in the vertical direction. The high-voltage transformers 9 and 9 for supplying electric power to the magnetrons 8 and 8 and the capacitors 10 and 10 for rectifying and smoothing the outputs of the high-voltage transformers 9 and 9 respectively are provided at the lower rear and upper rear of the heating chamber 6. It is arranged on both sides. Two cooling fan motors 11, 11 are provided on the back surface of the back wall 6 d of the heating chamber 6, and magnetrons 8, 8 are provided on the top and bottom surfaces of the top wall 6 a and the bottom wall 6 b of the heating chamber 6, respectively. Waveguides 12 and 12 for feeding the generated microwaves to the heating chamber 6 are arranged.

  On the top surface of the ceiling wall 6a of the heating chamber 6, an air supply duct 13 and an exhaust duct 14 for supplying outside air to the heating chamber 6 and exhausting exhaust gas from the heating chamber 6 are arranged. The exhaust duct 14 has a blower 15 in the exhaust path, and the blower 15 includes an impeller 15a in the duct and an exhaust motor 15b that drives the impeller 15a. On the outer surface of the side wall 6c of the heating chamber 6, a control unit 16 for controlling electric parts such as the operation units 3 and 4 and the magnetrons 8 and 8 is disposed.

  FIG. 6 is an explanatory diagram showing an appearance of the operation unit 3 arranged in the microwave main body 1. The operation unit 3 heats the recipe associated with the numeric key 31 composed of keys “0” to “9” for accepting the selection of the recipe stored in advance and the numeric value selected by the numeric key 31. Are provided with a start key 32 and a stop / clear key 36 for receiving the start and stop, respectively, and a display 5 for displaying information received from each key and information such as the remaining heating time.

  In addition, when setting and storing a recipe associated with a numerical value, the operation unit 3 receives a setting storage key 33 for receiving the stored recipe and a setting of the cooking time for the recipe being set. Time setting key 34 and an output setting key 35 for accepting the setting of the heating output for the recipe being set.

  The operation unit 3 further includes a help key 37 for displaying the stored setting contents of the recipe on the display unit 5, and if the weight of the object to be heated exceeds a predetermined amount when the recipe is set, the operation unit 3 temporarily A double / triple setting key 38 for receiving an object to be heated twice or triple of a predetermined amount and a quick thawing key 39 for receiving a setting of a quick thawing time are provided.

  FIG. 7 is an explanatory diagram showing the appearance of the operation unit 4 arranged on the door 2 of the microwave oven. The operation unit 4 heats the recipe associated with the numeric key 41 composed of keys “0” to “9” for accepting selection of recipes stored in advance and the numeric value selected by the numeric key 41. Are provided with a start key 42 and a stop / clear key 46 for receiving the start and stop, respectively.

  The same numerical value selected by the numerical key 31 and the numerical key 41 is associated with the same recipe, and each numerical recipe can be selected by the numerical key 31 and 41. The start and stop of the heating for the selected recipe are accepted by either the start key 32 or 42 and the stop / clear key 36 or 46, respectively.

FIG. 8 is a block diagram showing a main circuit configuration of the microwave oven. In the figure, the door 2 is closed and the heated object is not heated. One end of a power plug 51 connected to a single-phase AC power supply (commercial power supply) is connected to a main fuse 52 that melts when a circuit current of the microwave oven is abnormal, and when the temperature in the heating chamber 6 is abnormal (for example, in the heating chamber) It is connected to one end of a DC power source 54 formed of a switching power source and one end of a primary side of the AC voltage monitor circuit 55 through a thermal fuse 53 that melts at the time of ignition. The other end of the primary side of the AC voltage monitor circuit 55 is connected to the other end of the DC power supply 54 and the other end of the power plug 51 via a secondary interlock switch 56 that is turned off when the door 2 is opened.
Note that the DC power supply 54 may be automatically shut down by applying an AC power supply to the DC power supply 54 via a power saving circuit.

  The connection point between the thermal fuse 53 and the DC power source 54 is one end of an oven lamp 58 for illuminating the inside of the heating chamber 6 via a primary interlock relay contact 57a that is turned on from the time when the door 2 is opened until the end of heating. And one end of each of antenna motors 59 and 59 for rotating an antenna (not shown) that radiates microwaves fed from the waveguides 12 and 12 into the heating chamber 6. The other end of the oven lamp 58 and the other ends of the antenna motors 59 and 59 are connected to the other end of the power plug 51.

  The connection point between the primary interlock relay contact 57a and the oven lamp 58 is also connected to one end of a monitor switch 60 which is turned off when the door 2 is opened, and a heating relay contact 61a for turning on / off each output of the magnetrons 8 and 8. 61a is connected to each end. The other end of the monitor switch 60 is connected to one end of a secondary interlock switch 56 connected to the other end on the primary side of the AC voltage monitor circuit 55 and to one end on the primary side of the high-voltage transformers 9 and 9.

The other ends of the heating relay contacts 61a and 61a are connected to the high-voltage transformer 9 and the high-voltage transformer 9 through thermal fuses 62 and 62 that are blown when the temperature of the magnetrons 8 and 8 is abnormal (for example, when cooling is abnormal or when the temperature is high due to no load operation). 9 is connected to each other end of the primary side.
The heating relays that drive the heating relay contacts 61a and 61a are EMR (electromagnetic relay), but may be SSR (solid state relay).

  Capacitors 10 and 10 for voltage doubler rectification and diodes 81 and 81 are connected in series to the secondary sides of the high-voltage transformers 9 and 9, respectively, and both ends of the diodes 81 and 81 rectified to voltage doubler. Voltage is applied to the magnetrons 8 and 8, respectively. The magnetrons 8 and 8 are applied with heater voltages from the other secondary sides of the high-voltage transformers 9 and 9, respectively.

  The output voltage (5 V and GND) of the DC power supply 54 is given to the control unit 16 including the microcomputer 70 having the CPU 71. The microcomputer 70 includes a ROM 72 that stores information such as a program, a RAM 73 that partially includes a nonvolatile memory and stores information generated during the execution of the program, a timer that counts time, and an input / output circuit that is connected to the CPU 71 and a bus. Connected and configured. The CPU 71 executes processing such as calculation and input / output in accordance with a control program stored in advance in the ROM 72.

  An interlock relay drive circuit 57b, heating relay drive circuits 61b and 61b, a door switch 2c, and operation units 3 and 4 are connected to an input / output circuit (not shown) of the microcomputer 70. The display unit 5 is an operation unit. 3 is connected. Also connected to the input / output circuit of the microcomputer 70 are fan motor drive circuits 75 and 75 and an exhaust motor drive circuit 76 for driving the fan motors 11 and 11 and the exhaust motor 15b to DC drive and PWM drive, respectively. Connected to the secondary side of the AC voltage monitor circuit 55, a voltage obtained by stepping down and rectifying the voltage of the AC power supply, that is, a DC voltage for monitoring the voltage of the AC power supply is applied.

FIG. 9 is a timing chart showing the relationship between the operation states of the components shown in FIG. 9 (a) to 9 (i), the vertical axis indicates an on / off state or an open / closed state, and the horizontal axis indicates time. First, the case where the alternating voltage supplied to a microwave oven is 200V is demonstrated (it shows with a continuous line in each figure).
9A, when the 200V AC power source connected to the power plug 51 is turned on, as shown in FIG. 9B, the DC power source 54 is kept on until the AC power source is turned off. Continue to provide an output voltage of 5V. Thereafter, until the opening / closing of the door 2 is detected, the voltage of the AC power supply is detected, and the result is stored in the RAM 73.

  Next, when the door 2 is opened at time T0 in FIG. 9 (i), the CPU 71 of the microcomputer 70 that captures the state of the door switch 2c detects the opening of the door 2, and the interlock relay drive circuit 57b As shown in FIG. 9C, the primary interlock relay contact 57a is turned on. As a result, as indicated by solid lines in FIGS. 3D and 3E, the oven lamp 58 is turned on (lit), and the antenna motors 59, 59 (rotation) are turned on.

After that, when the door 2 is closed and an operation related to the start of heating is performed from the operation unit 3 or 4 at time T1 in FIG. 9J, the CPU 71 performs heating relay drive circuits 61b and 61b, a fan motor drive circuit 75. 75 and the exhaust motor drive circuit 76, as shown by solid lines in FIGS. 9 (f) to 9 (h), the heating relay contacts 61a, 61a, the fan motors 11, 11 (rotation), and the exhaust motor 15b ( Rotation) is turned on. At this time, electric power is supplied to the magnetrons 8 and 8 via the high-voltage transformers 9 and 9, respectively.
The average power supplied to the magnetrons 8 and 8 can be adjusted by turning on / off the heating relay contacts 61a and 61a (not shown).

  When the heating is ended at time T2, the CPU 71 turns off the heating relay contacts 61a and 61a (see FIG. 9F), and turns off the primary interlock relay contact 57a after about 1 minute (see FIG. 9C). ). Therefore, the oven lamp 58 and the antenna motors 59 and 59 are turned off after about 1 minute from the time T2 (see FIGS. 3D and 3E). Thereby, the inside of the heating chamber 6 is illuminated for a certain period of time after the end of heating, so that the food can be easily taken out.

  The fan motors 11 and 11 and the exhaust motor 15b that are turned on with the start of heating are turned off with a delay corresponding to the heating time, for example, from the time T2 (see FIGS. 9 (g) and 9 (h)). . This is to cool the electrical components whose temperature has increased with heating and to discharge the steam and odor in the heating chamber 6.

  When the door 2 is opened during heating, the secondary interlock switch 56 is turned off, and the connection between the AC power source and the high-voltage transformers 9 and 9 is disconnected. Further, the monitor switch 60 is turned on to short-circuit the AC voltage side of the heating relay contacts 61a and 61a so that power is not supplied to the high-voltage transformers 9 and 9.

Below, the case where the alternating voltage supplied to a microwave oven is 100V is demonstrated centering on the difference with the case where it is 200V (in some drawings, it shows with a broken line).
In FIG. 9A, when the AC power supply of 100V connected to the power plug 51 is turned on, the DC power supply 54 is kept on until the AC power supply is turned off because the allowable range of the AC voltage is widened. The controller 16 continues to be given an output voltage of 5V (see FIG. 9B). After that, until the opening / closing of the door 2 is detected, the voltage of the AC power supply is detected, and the result is stored in the RAM 73 as in the case of 200V.

Next, when the door 2 is opened at time T0 in FIG. 9 (i), the CPU 71 of the microcomputer 70 taking in the state of the door switch 2c detects the opening of the door 2, but the voltage of the AC power supply is 100V. Therefore, the primary interlock relay contact 57a is not turned on. Accordingly, the oven lamp 58 and the antenna motors 59 and 59 remain off (see the broken lines in FIGS. 9C to 9E).
When the oven lamp 58 is made of an LED and is driven by the DC power supply 54, the oven lamp 58 can be turned on when the opening of the door 2 is detected even when the voltage of the AC power supply is 100V. Good.

When an operation related to registration (setting and storage) of recipe contents is performed from the operation unit 3 or 4 when the door 2 is closed at time T1 in FIG. 9 (j), the CPU 71 displays the recipe contents. sign up. In this case, since the operation is not related to the start of heating, the fan motors 11 and 11 and the exhaust motor 15b are not turned on, as in the case of 200V.
As described above, even when the voltage of the AC power supply is 100 V, it is possible to accept the operation related to the registration of the recipe contents and to actually register the recipe contents.

  When an operation related to the start of the demonstration is performed from the operation unit 3 or 4 at time T1 in FIG. 9J, the CPU 71 causes the fan motor drive circuits 75 and 75 and the exhaust motor drive circuit 76 to As shown in (g) and 9 (h), the fan motors 11, 11 (rotation) and the exhaust motor 15b (rotation) are turned on, respectively. In this case, since the heating relay contacts 61a and 61a are not turned on by the heating relay drive circuits 61b and 61b, actual heating is not performed (see the broken line in FIG. 9F).

The fan motors 11 and 11 and the exhaust motor 15b, which are turned on in response to the operation related to the start of heating, are turned off with a delay corresponding to the heating time, for example, from time T2. This is similar to the case of 200 V (see FIGS. 9G and 9H).
Thus, even when the voltage of the AC power supply is 100 V, the fan motors 11 and 11 and the exhaust motor 15b are rotated without receiving heating by accepting an operation related to the start of the demonstration. It is possible to check the operation. As described above, when the oven lamp 58 is an LED, it can be turned on also during the demonstration.

  In this embodiment, “any one of the stop / clear keys 36, 46” + “help key 37” + “any number key 31, 41“ 9 ”” + “start key 32, 42 any When “ka” is pressed, the demonstration is started. The operation performed during the demonstration is not limited to the rotation of the motors and the lighting of the oven lamp described above, and an arbitrary operation can be prepared in advance.

Hereinafter, operations performed by the microwave oven according to the embodiment of the present invention will be described with reference to flowcharts.
FIG. 10 is a flowchart showing the processing procedure of the CPU 71 for storing the detection result of the voltage of the AC power source and detecting the opening / closing of the door 2. FIGS. 11 to 13 are the recipe setting, storage, selection, and start of simulated cooking. It is a flowchart which shows the process sequence of CPU71 which accepts. However, the display process on the display unit 5 and the process for unspecified operations are omitted. The following processing is executed by the CPU 71 according to a control program stored in advance in the ROM 72 of the microcomputer 70.

CPU71 starts the process of FIG. 10, when the power supply of a microwave oven is turned on and completes the initialization process, and starts the process of FIG. 10 again every time it completes the heating process. Then, each time the process of FIG. 10 is completed, the process of FIG. 11 is started.
A “low voltage flag” indicating the detection result of the voltage of the AC power supply is stored in the RAM 73 of the microcomputer 70. Moreover, although the rated voltage of a microwave oven shall be 200V, it is good also as 208V or 230V according to the area used, for example.

When the processing of FIG. 10 is started, the CPU 71 clears the “low pressure flag” to 0 (S10). Thereafter, the CPU 71 takes in a DC voltage for monitoring the voltage of the AC power supply from the secondary side of the AC voltage monitor circuit 55 (S11), and determines whether or not the voltage of the AC power supply is 200V of the rated voltage, that is, 200V ± It is determined whether it is 10% (S12). When it determines with it being 200V (S12: YES), CPU71 advances a process to step S16 mentioned later. When it is determined that the voltage is not 200 V (S12: NO), the CPU 71 determines whether the voltage of the AC power supply is 100 V, that is, whether it is 100 V ± 10% (S13).
Note that, in step S12, for example, it is determined whether or not it is 200V-20V (10% decrease value of 200V) or less. Further, the AC voltage monitor circuit 55 may detect the voltage of the AC voltage by a method other than step-down and rectification.

  When it determines with it not being 100V (S13: NO), CPU71 displays an error on the indicator 5 (S14), and complete | finishes a process. When it is determined that the voltage is 100 V (S13: YES), the CPU 71 sets the “low pressure flag” to 1 (S15). Thereby, it is shown that the voltage of AC power supply is 100V lower than the rated voltage of a microwave oven. Thereafter, the CPU 71 takes in the state of the door switch 2c and determines whether or not the door 2 is opened (S16). If it is determined that the door 2 is not opened (S16: NO), the CPU 71 waits until the door 2 is opened. To do.

  When it is determined that the door is opened (S16: YES), the CPU 71 determines whether or not the “low pressure flag” is 1 (S17). When it is determined that it is not 1 (S17: NO), that is, when the voltage of the AC power supply is 200 V, the CPU 71 turns on the primary interlock relay contact 57a by the interlock relay drive circuit 57b (S18). When the process of step S18 is completed, or when it is determined in step S17 that the “low pressure flag” is 1 (S17: YES), the CPU 71 takes in the state of the door switch 2c and determines whether or not the door 2 is closed. If it is determined that the door 2 is not closed (S19: NO), the process waits until the door 2 is closed. When it determines with the door 2 having been closed (S19: YES), CPU71 complete | finishes a process.

  When the process of FIG. 11 is started, the CPU 71 calls and executes a subroutine related to key input (S21), and determines whether the pressed key is one of the numeric keys 31, 41. (S22). When it is determined that the key is one of the numeric keys 31 and 41 (S22: YES), the CPU 71 stores the numerical value of the pressed key in the RAM 73 (S23). Thereafter, the CPU 71 calls and executes a subroutine relating to key input again (S24), and determines whether the pressed key is one of the start keys 32 and 42 (S25).

  When it is determined that the pressed key is not any of the start keys 32 and 42 (S25: NO), the CPU 71 ends the process. When it is determined that the pressed key is one of the start keys 32 and 42 (S25: YES), the CPU 71 determines whether or not the “low pressure flag” is set to 1 (S26). When it determines with having set to 1 (S26: YES), ie, when the voltage of AC power supply is 100V, CPU71 complete | finishes a process and skips a heating process.

  When it is determined that the “low pressure flag” is not set to 1 (S26: NO), the CPU 71 reads the numerical value stored in the RAM 73 in step S23 and reads the corresponding recipe from the nonvolatile area of the RAM 73 (S27). Then, the CPU 71 executes a heating process known per se based on the read recipe (S28), and ends the process. The description of the flowchart is omitted for the heat treatment. Note that when the pressing of any of the stop / clear keys 36 and 46 is detected in the heating process, the heating process is terminated.

  When it is determined in step S22 that the pressed key is not any of the numeric keys 31 and 41 (S22: NO), the CPU 71 determines whether or not the pressed key is the setting storage key 33. (S31) When it determines with it being the setting storage key 33 (S31: YES), a process is advanced to step S41 mentioned later. When it is determined that the pressed key is not the setting storage key 33 (S31: NO), the CPU 71 determines whether the pressed key is one of the stop / clear keys 36, 46 ( S32).

  If it is determined that the pressed key is one of the stop / clear keys 36 and 46 (S32: YES), the CPU 71 advances the process to step S61 in FIG. When it is determined that the pressed key is not any of the stop / clear keys 36 and 46 (S32: NO), the CPU 71 executes other key processing (S33) and ends the processing. The other key processing is processing corresponding to the accepted operation, and the description of the flowchart is omitted.

  Below, the process of FIG. 12 branched from step S31 is demonstrated. When it is determined that the pressed key is the setting storage key 33 (S31: YES), the CPU 71 calls and executes a subroutine related to key input (S41), and the pressed key is any of the numeric keys 31, 41. It is determined whether or not the key is (S42). If it is determined that none of the numeric keys 31 and 41 is present (S42: NO), the CPU 71 returns the process to step 41 in order to detect pressing of the next key.

  When it is determined that the pressed key is one of the numeric keys 31 and 41 (S42: YES), the CPU 71 stores the numerical value of the pressed key in the RAM 73 (S43). Thereafter, the CPU 71 calls and executes a subroutine relating to key input (S44), and determines whether or not the pressed key is the time setting key 34 (S45). When it is determined that the key is the time setting key 34 (S45: YES), the CPU 71 calls and executes a subroutine related to key input (S46), and the pressed key is one of the numeric keys 31, 41. It is determined whether or not (S47).

  When it is determined that the pressed key is not any of the numeric keys 31 and 41 (S47: NO), the CPU 71 returns the process to step S46 in order to detect the next key press. When it is determined that the pressed key is one of the numeric keys 31 and 41 (S47: YES), the CPU 71 stores the cooking time corresponding to the numerical value of the pressed key in the RAM 73 (S48). The process returns to step S44.

  In the present embodiment, the value obtained by multiplying the numerical value of the key detected to be pressed by 10 is associated with the cooking time in seconds. However, the present invention is not limited to this. With this subroutine, key information of numeric keys is obtained for three digits, and the first digit and the second and third digits of the numerical value of the key specified by each key information correspond to the cooking time as the numerical value in minutes and seconds respectively. You may let them.

  If it is determined in step S45 that the pressed key is not the time setting key 34 (S45: NO), the CPU 71 determines whether or not the pressed key is the output setting key 35 (S49). If it is determined that the key is the output setting key 35 (S49: YES), the CPU 71 calls and executes a subroutine related to key input (S50), and the pressed key is one of the numeric keys 31, 41. Is determined (S51).

  When it is determined that the pressed key is not any of the numeric keys 31 and 41 (S51: NO), the CPU 71 returns the process to step S50 in order to detect the pressing of the next key. When it is determined that the pressed key is one of the numeric keys 31 and 41 (S51: YES), the CPU 71 stores the heating output corresponding to the numerical value of the pressed key in the RAM 73 (S52). The process returns to step S44.

  In the present embodiment, a value obtained by multiplying the numerical value of the key detected by pressing by 10 is made to correspond to the percentage of the maximum value of the heating output. However, the present invention is not limited to this. The key information of the numeric keys for two digits may be obtained by the subroutine according to the above, and the two-digit numerical value of the key specified by each key information may be directly associated with the percentage of the maximum value of the heating output.

  If it is determined in step S49 that the pressed key is not the output setting key 35 (S49: NO), the CPU 71 determines whether or not the pressed key is the setting storage key 33 (S53). When it determines with it not being the setting memory key 33 (S53: NO), CPU71 returns a process to step S44. When it is determined that the pressed key is the setting storage key 33 (S53: YES), the CPU 71 reads the numerical value, cooking time, and heating output stored in the RAM 73 (S54). And CPU71 matches cooking time and a heating output with the read numerical value, memorize | stores it in the non-volatile area | region of RAM73 as a recipe (S55), and complete | finishes a process.

  Below, the process of FIG. 13 branched from step S32 is demonstrated. When it is determined that the pressed key is one of the stop / clear keys 36 and 46 (S32: YES), the CPU 71 determines whether or not the “low pressure flag” is set to 1 (S61). ). If it is determined that it is not set to 1 (S61: NO), the CPU 71 ends the process.

  When it is determined that the “low voltage flag” is set to 1 (S61: YES), that is, when the voltage of the AC power supply is 100V, the CPU 71 calls and executes a subroutine related to key input (S62) and presses it. It is determined whether or not the assigned key is the help key 37 (S63). If it is determined that the key is not the help key 37 (S63: NO), the CPU 71 ends the process.

  If it is determined that the pressed key is the help key 37 (S63: YES), the CPU 71 calls and executes a subroutine related to key input (S64), and the pressed key is one of the numeric keys 31, 41. It is determined whether it is “9” (S65). When it is determined that neither of the numeric keys 31 and 41 is “9” (S65: NO), the CPU 71 ends the process.

  When it is determined that the pressed key is “9” of any of the numeric keys 31 and 41 (S65: YES), the CPU 71 calls and executes a subroutine related to key input (S66), and presses the pressed key. Is one of the start keys 32 and 42 (S67). If it is determined that none of the start keys 32 and 42 is present (S67: NO), the CPU 71 ends the process.

When it is determined that the pressed key is one of the start keys 32 and 42 (S67: YES), that is, “any of the stop / clear keys 36 and 46” + “help key 37” + “numbers” When the key presses are detected in the order of “9” of any of the keys 31, 41 + “any of the start keys 32, 42”, the CPU 71 executes a demonstration (simulated cooking) prepared in advance in the ROM 72. (S68), and the process ends. For the demonstration, the description of the flowchart is omitted.
It should be noted that the demonstration start operation may be accepted when it is detected that a predetermined key is pressed in combination within a range that can be distinguished from other operations.

FIG. 14 is a flowchart showing a processing procedure of the CPU 71 for storing key information for specifying the pressed key in the key buffer, and FIG. 15 is a flowchart showing a processing procedure of the CPU 71 related to a key input subroutine. . 14 and 15 are executed according to a control program stored in the ROM 72 in advance. The process of FIG. 14 is executed when a key press of any of the operation units 3 and 4 is detected, and the subroutine of FIG. 15 executes the key from the key buffer described above when called from the main routine. Information is read and executed.
The key buffer secures a storage area in the RAM 73, and in the initialization process of the CPU 71, the write pointer and the read pointer are made to point to the head of the key buffer.

  When the process of FIG. 14 is activated, the CPU 71 determines whether any key of the operation unit 3 of the range body 1 is pressed (S81). If it is determined that any key has been pressed (S81: YES), the CPU 71 fetches key information for identifying the pressed key from the operation unit 3 (S82) and writes it into the key input buffer (S83). The write pointer is incremented (S84) and the process is terminated.

  When it is determined that any key of the operation unit 3 is not pressed (S81: NO), the CPU 71 determines whether any key of the operation unit 4 of the door 2 is pressed (S85). When it is determined that no key is pressed (S85: NO), the CPU 71 ends the process. When it is determined that any key of the operation unit 4 has been pressed (S85: YES), the CPU 71 fetches key information for identifying the pressed key from the operation unit 4 (S86) and writes it to the key input buffer. (S87) The write pointer is incremented (S88), and the process is terminated.

  When the process of FIG. 15 is called, the CPU 71 determines whether or not there is key information in the key input buffer, that is, whether or not the write pointer is ahead of the read pointer (S91). When it is determined that there is no key information (S91: NO), the CPU 71 waits until the key information is present in the key input buffer.

  If it is determined that there is key information in the key input buffer (S91: YES), the CPU 71 reads one key information from the key input buffer (S92) and sets it to the return value of the subroutine (S93), and increments the read pointer. (S94). Thereafter, the CPU 71 determines whether or not the key identified by the read key information is any of the numeric keys 31 and 41 (S95), and determines that it is not any of the numeric keys 31 and 41. If so (S95: NO), the process returns to the called routine.

  When it is determined that the key identified by the read key information is one of the numeric keys 31 and 41 (S95: YES), the CPU 71 determines whether or not there is further key information in the key input buffer. (S96). If it is determined that there is no further key information (S96: NO), the CPU 71 waits until the key information is present in the key input buffer. When it is determined that there is key information in the key input buffer (S96: YES), the CPU 71 reads one key information from the key input buffer (S97), and the key identified by the read key information is the numeric keys 31, 41. It is determined whether the key is any one of (S98).

If it is determined that the key identified by the read key information is not any of the numeric keys 31 and 41 (S95: NO), the process returns to the called routine. When it is determined that the identified key is one of the numeric keys 31 and 41 (S98: YES), the CPU 71 sets the read key information to a return value (S99) and increments the read pointer. (S100) The process returns to step S96.
As described above, when key information specifying any one of the numeric keys 31 and 41 is read, the key buffer is read until key information specifying a key other than any one of the numeric keys 31 and 41 is read. The key information is continuously read from the key information, and only the key information of any one of the numeric keys 31 and 41 is set as a return value.

As described above, according to the present embodiment, when the voltage of the AC power supply is 100 V (that is, when the voltage is lower than 180 V, which is 10% lower than 200 V), the heat treatment is not applied to the heating unit. Stop supplying power. Thereby, for example, even when a general household 100V commercial power supply is energized for a microwave oven having a rated voltage of 200V, when heating is started for some reason, the voltage is lower than the rated voltage. In order to prevent the heating unit to which the is applied from failing and the unexpected large current from flowing into the heating unit, there is no possibility that the device is damaged and the human body is damaged.
Therefore, it can be safely maintained by connecting to a commercial power supply having a voltage lower than the rated voltage.

  Also, since it incorporates a DC power supply that enables control such as operation acceptance regardless of the voltage of the AC power supply, it is not necessary to open the microwave oven main body for tap switching of the power transformer, for example. Since the part is not exposed, maintenance can be performed more safely.

Furthermore, when a recipe for simulated cooking (demonstration) simulating cooking of an object to be heated in the heating chamber is prepared in advance and stored in the ROM, and the voltage of the AC power supply is 100 V, the “stop / clear key” When “+ key” + “number key“ 9 ”” + “start key” is detected, the start of simulated cooking by the recipe stored in the ROM is accepted.
Therefore, for example, in a place such as a store, a delivery destination office, a waiting room, etc., it is possible to perform a demonstration showing the flow of cooking to the customer without actually heating the object to be heated by the heating unit.

  Furthermore, regardless of whether the voltage of the AC power supply is 100 V, in order to accept operations for setting and registering recipes, not only installation locations such as kitchens, but also stores, delivery offices, waiting rooms, etc. It is possible to set and register a cooking program as a recipe in advance at the place.

  In this embodiment, recipe setting and registration are accepted as separate operations. However, the present invention is not limited to this, and the set recipe is stored and registered in the nonvolatile area of the RAM 73 as it is. You may be made to do.

1 Range body 2 Door 3, 4 Operation part (means to receive)
5 Display 6 Heating chamber (heating unit)
7 Cabinet 8 Magnetron (heating unit)
16 Control section 31, 41 Numeric keys 32, 42 Start key 33 Setting storage key 36, 46 Stop / clear key 37 Help key 54 DC power supply 55 AC voltage monitor circuit (detection means)
61a, 61a Heating relay contact 70 Microcomputer 71 CPU (detection means, determination means, prohibition means, storage means, reception means)
72 ROM (storage means)
73 RAM

Claims (3)

In a heating cooker including a heating unit that heats an object to be heated with electric power supplied from a connected commercial power source,
Means for detecting the voltage of the commercial power source;
Determination means for determining whether the voltage value detected by the means is lower than a predetermined voltage value;
A heating cooker comprising: means for prohibiting supply of electric power to the heating unit when the determining means determines that the voltage is lower than a predetermined voltage value. Storage means for storing in advance a recipe for simulated cooking simulating cooking by the heating unit;
2. The cooking device according to claim 1, further comprising: a unit configured to receive a simulated cooking start operation by a recipe stored in the storage unit when the determination unit determines that the voltage is lower than a predetermined voltage value.   The cooking device according to claim 1 or 2, further comprising means for accepting an operation for setting a recipe regardless of a determination result of the determination means.

Images