JP2014055679A - High-frequency heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely operate by detecting a temperature and a steam quantity in a heating chamber even when abnormal heating occurs, and to prevent an early stop caused by erroneous discrimination of a food quantity even when a user performs middle operation in order to improve finish of cooking.SOLUTION: A high-frequency heating apparatus is for determining whether a food quantity is small or large (step S7), and changing a threshold value depending on whether a food quantity is small or large, and detecting abnormal heating of food to lower an output level of magnetron (step S9), and stopping magnetron (step S12) if a steam quantity in a heating chamber is equal to or less than a prescribed value (step S14) when a food quantity is small, or continuing the heating when a food quantity is a considerably large quantity, or continuing the heating when a state in a storage is under monitor, depending on the presence or absence of middle operation of a user.

Description

  The present invention relates to a high-frequency heating apparatus in which food temperature in a heating chamber is detected by a surface temperature detection means and safety is taken into consideration.

  Conventionally, high-frequency heating devices such as microwave ovens have taken measures against abnormal heating due to misuse by the user, and ensure safety. For example, calculate the weight change from the initial stage of the food when the steam generated from the food is detected when high-frequency heating is performed, and compare it with the abnormal heating judgment weight calculated from the time until the steam is detected. Is disclosed so that abnormal heating of food is prevented (see, for example, Patent Document 1).

  In addition, the size of the food is estimated based on the rise time of the ambient temperature in the heating chamber, not the weight of the food, and the threshold for reducing the output level of the high-frequency generating means is set separately for small loads and large loads. Thus, there has been disclosed one that prevents abnormal heating even when heating with a small load (see, for example, Patent Document 2).

JP 2003-214632 A JP 2009-127924 A

  The high-frequency heating device described in Patent Document 1 needs to measure the weight of food, and the weight of the food is measured through a mounting table on which the food is placed. In this case, if the mounting table is circular, weight measuring means can be provided under the shaft that supports the mounting table, but food can be placed outside the circular mounting table in the rectangular heating chamber. Since there is no space, the amount of food that can be cooked at one time is the area of the mounting table, and the area of the bottom surface of the heating chamber cannot be used effectively.

  Therefore, recent high-frequency heating devices such as microwave ovens have a meaning of improving the cleaning property, and the one in which the bottom surface of the heating chamber is formed in a flat shape has been dominant. In such a high-frequency heating device, the bottom surface of the heating chamber is fixed to the heating chamber, and it is difficult to provide weight measuring means, and even if it can be configured, the number of parts increases and the price is high. It becomes a product.

  For this reason, in recent high-frequency heating devices, many devices equipped with an infrared sensor for detecting the surface temperature of food have been put on the market instead of weighing. In this apparatus, when the surface temperature of the food detected by the infrared sensor reaches a predetermined temperature, it is determined as abnormal and the heating is stopped. The infrared sensor detects the surface temperature of the food, and can heat the food based on the output of the infrared sensor and perform automatic heating that automatically stops the heating when the temperature reaches an appropriate temperature.

However, in the case of manual heating in which the user sets and operates at an arbitrary time, heating to an appropriate temperature depends on the heating power selected by the user and the set time. That is, referring to the user's experience and information described in the instruction manual, the heating power and the heating time are set and operated according to the size and type of food. Therefore, the heating power and the heating time selected as a heating device operate regardless of whether they are appropriate, and if the selected heating conditions are not appropriate, the food may be abnormally heated. The

  In view of this, the infrared sensor is utilized during the manual heating, and when the infrared sensor detects an abnormally high temperature, the heating power is reduced to improve safety.

  The high-frequency heating device described in Patent Document 2 is such that when a user heats a small amount of food, the ambient temperature in the heating chamber is accidentally increased even when heating is started with a large heating power and a long heating time. If it is determined that the food temperature in the heating chamber has become high, the heating power is reduced so that the heating does not proceed further, so that abnormal heating of the food can be prevented.

  However, in the high-frequency heating device described in Patent Document 2, in the case of a small amount of food that easily rises in temperature, the food is abnormally heated and the temperature rapidly rises, and the operation stops without being sufficiently heated. There was a problem.

  Further, in the high-frequency heating apparatus described in Patent Document 2, on the contrary, even when a large amount of food is heated, for example, when the atmospheric temperature in the heating chamber is high, the temperature of the food rises quickly, as if a small amount of food is heated. Thus, there is a problem that the temperature suddenly rises and the operation stops without being sufficiently heated.

  When heating with the above-mentioned high-frequency heating device, if nothing has been cooked before cooking, the temperature rise in the heating chamber can be accurately detected, so whether the food to be heated is small or large It is possible to accurately determine whether or not there is an abnormal heating with an accurate threshold.

  However, when heating with the above-described high-frequency heating device, if cooking is performed before cooking and the heating chamber is warm, the temperature rise or the like cannot be accurately detected, and a large amount of food is to be heated. Even if it exists, it will be misjudged as if it is a small amount. Despite the large amount of food, there is a problem that abnormal heating is detected with a small amount of threshold value, and the cooking ends prematurely and cooking is not completed, and heating ends.

  In the above-described high-frequency heating device, the user starts heating by setting an arbitrary heating power and heating time, but it is necessary to perform an intermediate operation such as stirring the food or changing the position depending on the cooking state during the heating. However, if the heating is started again after that, it is applicable when the heating chamber is warm, the temperature rise etc. cannot be detected accurately, it is erroneously determined as a small amount, and abnormal heating is detected with a small threshold, Heating ends with premature cooking and unfinished cooking.

  The present invention solves the above-mentioned conventional problems, and determines whether the amount of food is small or large by accurately detecting an increase in temperature in the heating chamber at the beginning of heating, and is suitable for the food. Abnormal heating can be prevented with the threshold value. It is another object of the present invention to provide a safe and reliable high-frequency heating device that can prevent premature disconnection when operated in the middle by storing the threshold value.

In order to solve the above-described conventional problems, a high-frequency heating device of the present invention includes a heating chamber for storing food, high-frequency generating means for generating a high frequency for dielectrically heating food in the heating chamber, Surface temperature detection means that is disposed outside the wall surface and detects the temperature of the food in the heating chamber in a non-contact manner, chamber temperature detection means for detecting the atmospheric temperature in the heating chamber, and a chamber that detects the amount of steam in the heating chamber An internal steam detection means, and a controller for controlling the output of the high-frequency generation means based on the output from the surface temperature detection means, the internal temperature detection means, and the internal steam detection means, the control part, When the user inputs a heating start operation at an arbitrary time, it is judged whether the food is small or large, and the threshold is changed depending on whether the food is small or large, and abnormal heating of the food is detected. Of the high frequency generating means Together reduce the force level, if the food was small, steam volume of the heating chamber is configured so as to stop the high frequency generating means is equal to or less than a predetermined value.

  With the above configuration, when a user heats a small amount of food, even if the heating power is mistakenly increased and the heating time is set to be long and heating is started, an increase in the atmospheric temperature in the heating chamber is detected, and the heating chamber When it is determined that the food temperature has become high, the heating power is reduced so that the heating does not proceed further, so that abnormal heating of the food can be prevented.

  In order to solve the above-described conventional problems, the high-frequency heating device of the present invention determines whether food is large or small when a user sets an arbitrary time at the beginning of heating and inputs a heating operation. The threshold corresponding to the amount of the food is stored. Until the user presses the “Cancel” key or until the heating operation time set by the user is reached, the threshold value is used to detect abnormal heating of the food and reduce the output level of the high-frequency house generating means. When the amount of food is small, the high frequency generating means is stopped if the amount of steam in the heating chamber is equal to or less than a predetermined value.

  The controller inputs a heating start operation, determines whether the food is large or small, and detects abnormal heating by changing the threshold value depending on whether the food is large or small. However, during cooking, an abnormal heating of the food is detected with the threshold of whether the food is large or small at the beginning of heating, but the "Cancel" key is pressed or the set heating operation time is reached At this point, the memory of the threshold value is canceled.

  With the above configuration, when the user sets an arbitrary time and inputs a heating operation, it is determined whether the amount of food is large or small, and a threshold value corresponding to the amount of the food is stored, so that cooking is in progress. When an intermediate operation such as stirring is performed, abnormal heating is detected with a threshold suitable for the food without making a misjudgment such as a small amount of food. Disappear.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to prevent the abnormal heating at the time of manually heating a small amount of foodstuffs, the premature cutting | disconnection at the time of intermediate operation can be prevented, and a safe and reliable high frequency heating apparatus can be provided.

1 is a system schematic diagram of a high-frequency heating device according to an embodiment of the present invention. Front view showing a state where the open / close door of the high-frequency heating device is opened Configuration diagram of the machine room viewed from the right side of the high-frequency heating device Block diagram showing the electrical configuration of the control unit Flow chart showing control contents of the control unit Flow chart showing the control contents when there is a large amount of food in the control unit Explanatory drawing which shows the temperature acquisition area of the infrared sensor in the same high frequency heating device

A first invention is a heating chamber for storing food, high-frequency generating means for generating a high frequency for dielectrically heating the food in the heating chamber, and the temperature of the food in the heating chamber disposed outside the wall surface of the heating chamber. Non-contact surface temperature detection means, chamber temperature detection means for detecting the atmospheric temperature in the heating chamber, chamber steam detection means for detecting the amount of steam in the heating chamber, surface temperature detection means, And a controller that controls the output of the high-frequency generator based on the output from the internal steam detector, and the controller starts heating with an arbitrary time set by the user When the operation is input, it is determined whether the food is small or large, and the threshold is changed depending on whether the food is small or large, thereby detecting abnormal heating of the food and lowering the output level of the high-frequency generating means, Small amount of food If Tsu, by steam volume of the heating chamber to stop the high frequency generating means is equal to or less than a predetermined value, it is possible to prevent abnormal heating in the case of manual heating a small amount of food.

  In a second aspect of the invention, in particular, in the first aspect of the invention, when the user sets an arbitrary time and inputs a heating start operation, the control unit determines whether the amount of food is small or large. Detects the abnormal heating of the food by changing the threshold depending on whether the amount is small or large, stores the threshold at the beginning of heating, detects the abnormal heating of the food with the threshold, and determines the output level of the high-frequency generating means If the amount of steam in the heating chamber is less than or equal to a predetermined value and the amount of steam in the heating chamber is less than a predetermined value, the high frequency generating means can be stopped to prevent abnormal heating when manually heating a small amount of food, Prevents premature disconnection during operation.

  In the third invention, in particular, in the first or second invention, the detection of the atmospheric temperature in the heating chamber and the detection of the amount of steam in the heating chamber are performed by one thermistor, thereby reducing the number of parts and simplifying the configuration. Can be

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a system schematic diagram of a high-frequency heating device according to Embodiment 1 of the present invention, FIG. 2 is a front view showing a state where an opening / closing door of the high-frequency heating device is opened, and FIG. 3 is a configuration diagram of a machine room as viewed from the right side. 4 is a block diagram showing the electrical configuration, and FIGS. 5 and 6 are flowcharts for explaining the operation.

  On the bottom surface of the heating chamber 1, a salauque die 2 obtained by cutting the crystallized glass serving as the bottom surface of the heating chamber with the dimensions of the heating chamber is inserted, and the food 3 is placed on the salaque die 2. A temperature detection hole 4 is formed above the right side of the heating chamber, and a surface temperature detection means 5 (hereinafter referred to as an infrared sensor 5) disposed on the outside of the wall surface of the heating chamber is opposed to the heating chamber. The surface temperature of the food 3 in the heating chamber 1 is detected in a non-contact manner. The infrared sensor 5 is repeatedly operated in the direction indicated by the arrow by the drive motor 6 so that the temperature in a predetermined range of the bottom surface portion in the heating chamber 1 can be detected.

  Inside the top right of the top surface of the heating chamber, an in-chamber temperature detecting means (hereinafter referred to as a heating chamber thermistor 7) for measuring the atmospheric temperature in the heating chamber is provided. 8 is a control unit mainly composed of a microcomputer, which controls the operation of the drive motor 6, A / D converts the signal voltage obtained from the surface temperature detecting means 5 and the signal voltage obtained from the heating chamber thermistor 7, The A / D-converted temperature data of the food 3 is compared with the judgment value of the finished temperature of the predetermined food 3 to determine the heating time of the food 3 or to control the output of the high frequency generating means described later. is there. In the back of the heating chamber 1, there is disposed a water reservoir 10 for boiling the water supplied from the nozzle 9 to generate steam.

A door 11 is provided on the front surface of the heating chamber 1 so as to be openable and closable. Further, various operation keys 11a to 11d for a user to select a heating menu, an instruction to start heating, and the like, and a display unit 12 for performing necessary display. There is provided an operation panel 13 having. A control board (not shown) is disposed on the back side of the operation panel 14, and a control circuit 8 and a drive circuit 14 for operating the high frequency generating means are provided on the control board. A machine room is provided behind the operation panel.

  In the machine room, a magnetron 15 serving as a high-frequency generating means is disposed on the right side wall of the heating chamber 1. On the right side of the magnetron 15, a cooling fan 17 and an air guide A 18 attached to the writer 16 are arranged to cool the magnetron 15. On the left side of the magnetron 15, an air guide C <b> 19 is installed to send air into the heating chamber 1. The air guide C19 is provided with an exhaust thermistor 20 that detects the temperature of the magnetron 15.

  The high frequency oscillated from the magnetron 15 supplies microwaves into the heating chamber 1 from a power supply port (not shown) provided on the bottom surface of the main body via a waveguide (not shown). An inverter 21 that varies the output of the magnetron 15 is disposed above the magnetron 15. The infrared sensor 5 is disposed between the inverter 21 and the lamp 22 that illuminates the inside of the heating chamber 1.

  FIG. 4 shows an electrical configuration. In FIG. 4, the control unit 8 includes various operation keys 11 a to 11 d including a start switch, an infrared sensor 5, an exhaust thermistor 20 that detects the temperature of the magnetron 15, and a heating chamber that detects the temperature in the heating chamber 1. A signal from the thermistor 7 is input. The control unit 8 displays information on the heating time and accessories on the display 12 according to a program stored in advance based on these signals, and also includes a magnetron 15, an upper heater 22, and a lower heater 23 via the drive circuit 14. The cooling fan 16, the steam heater 24, and the drive motor 6 are controlled.

  Since the magnetron 15 is controlled via the inverter 21, the output can be controlled. For example, the steam heater 24 and the high frequency output 300W can be used simultaneously.

  The operation of the high-frequency heating apparatus configured as described above will be described with reference to the flowcharts of FIGS.

  FIGS. 5 and 6 show portions related to the gist of the present invention in the contents of control by the control unit 8, and will be described below together with related operations.

  When the user heats food, the output power of the high frequency heating is selected by tapping the “range output switching” key of the operation key 11b (step S1). The high-frequency heating device of the present embodiment is set to switch from 800 W to 500 W to 150 W every time a tap is selected when 800 W output is selected when it is first pressed. Here, it is assumed that 800 W output is selected.

  Next, the user sets the time to be operated by turning the dial of the operation key 11c (step S2). When the user selects 800 W as the output power of the high frequency heating, the maximum heating time is set to be selectable up to 10 minutes. Moreover, when 600 W and 500 W are selected, the maximum heating time is set to be selectable up to 30 minutes. In addition, when 150 W is selected, it is set to be selectable for up to 5 hours.

  Then, the user presses a “start” key for instructing the start of heating, and heating is started (step S3). Simultaneously with the start of heating, the control unit 8 operates the drive motor 6 via the drive circuit 14.

During heating, the controller 8 first monitors whether the door 11 has been opened as a determination of whether to stop heating (step S4). When the door 11 remains closed, it is monitored whether or not the “cancel” key of the operation key 11d has been pressed (step S5). Even if the heating operation time set by the user has not been reached, the heating can be stopped at any time by opening the door 11 (step S4) or pressing the “cancel” key (step S5). (Step S12).

  In step S6, it is determined whether the temperature in the heating chamber 1 has risen and the temperature detected by the heating chamber thermistor 7 has reached T ° C. This is because the temperature in the heating chamber 1 is maintained at the starting temperature for a while after the heating is started. Thereafter, as the heating proceeds, steam starts to be generated from the food and the temperature in the heating chamber 1 also rises.

  The determination value T ° C. for determining whether the food is sufficiently heated was set to 80 ° C. by experiment. In step S6, when the temperature in the heating chamber 1 does not exceed the determination value of 80 ° C., it is determined that the food is not sufficiently heated and naturally not abnormally heated, and the process proceeds to step S11.

When the temperature in the heating chamber 1 is 80 ° C. or higher in step S6, it is determined whether the amount of food is large or small. This small / large quantity determination is performed by measuring the time required from the start of heating until the temperature of the heating chamber 1 becomes 80 ° C. or higher when the temperature in the heating chamber 1 becomes 80 ° C. or higher. Compare with X time. And if this required time is more than X time, it will determine with the quantity of food being large. If the required time is less than X hours, it is determined that the amount of food is small (step S7).
(If food is small)
If the amount of food is small, two determinations are made in parallel.

  First, in the first determination, a temperature detected by the infrared sensor 5 (referred to as IR detection temperature) is compared with a threshold temperature for a small load (in this embodiment, set to 92 ° C.) (step S8). As a result of the comparison, if the IR detection temperature is equal to or higher than the threshold temperature, the output of the magnetron 15 that is the high-frequency generating means is reduced to alleviate the heating (step S9).

  If the IR detection temperature is equal to or lower than the threshold temperature, it is determined whether the cooking time has reached the set cooking time (step S11).

  Then, the output of the magnetron 15 is reduced, and after a predetermined time has elapsed, the temperature detected by the infrared sensor 5 is again compared with the first abnormal heating temperature (98 ° C.) (step S10). When the IR detection temperature is higher than the first abnormal heating temperature, the IR detection temperature is higher than the second abnormal heating temperature after a predetermined time and compared with the second abnormal heating temperature (92 ° C.). The magnetron 15 is stopped, and when the IR detection temperature is lower than the second abnormal heating temperature, heating is performed in the reduced output state until the cooking time ends (step S11).

  The second determination in the case where the amount of food is small is to compare whether the food is sufficiently heated and compare the internal temperature with a threshold value (step S13). In the present embodiment, this threshold is set to 80 ° C. When the internal temperature reaches 80 ° C. or higher, the amount of steam in the heating chamber 1 is detected (step S14).

When the amount of steam in the heating chamber 1 is less than the predetermined amount, it is determined that the steam has been emitted from the food, and the operation of the magnetron 15 is stopped so as not to abnormally heat the food (step S12). For detecting the amount of steam, the heating chamber thermistor 7 serving as a means for detecting the temperature inside the heating chamber 1 was also used as a steam sensor.
(When food is large)
If the amount of food is large, in step S15, the temperature detected by the infrared sensor 5 is compared with the threshold temperature for large loads (set to 98 ° C. in this embodiment), as in the case of a small amount of food. (Step S15). As a result of the comparison, if the IR detection temperature is equal to or higher than the threshold temperature, the output of the magnetron 15 that is the high-frequency generating means is reduced to alleviate the heating (step S16).

  If the IR detection temperature is equal to or lower than the threshold temperature, it is determined whether the cooking time has reached the set cooking time (step S17).

  Then, the output of the magnetron 15 is reduced, and after a predetermined time has elapsed, the temperature detected by the infrared sensor 5 is again compared with the first abnormal heating temperature (110 ° C.) (step S18). When the IR detection temperature is higher than the first abnormal heating temperature, after a predetermined time, it is compared with the second abnormal heating temperature (105 ° C.). When the IR detection temperature is higher than the second or higher heating temperature, the magnetron 15 is stopped, and when the IR detection temperature is lower than the second or more heating temperature, heating is performed in the reduced output state until the cooking time ends (step S19).

  The above description applies when the user performs a heating operation, when some cooking is not performed before heating, and the temperature in the heating chamber is low. For example, assume that the heating time is set to 10 minutes at 600 W output and heating is started. When the cooking state is observed and the heating end time is 10 minutes before, the door is opened during cooking, the food is taken out, stirred, returned to the heating chamber again, and cooking is restarted (S20). / Predetermined value for which the large quantity determination (S7) has been performed is stored, and with the stored value whether the quantity is small or large (S21), to the step for the small quantity or to the step for the large quantity, respectively Transition.

  FIG. 7 shows the reading range of the infrared sensor 5 of the present embodiment. The infrared sensor 5 has eight elements and is reciprocated by the drive motor 6 so as to detect the temperature of the entire heating chamber, so that a detection area as shown in FIG. When the potato-sized 3a is placed in the center of the heating chamber, the temperature of the food itself can be detected because the food is larger than the detection area. When the remaining food, for example, an object 3b having a size such as a sweet potato cut 50g is placed on the left side of the heating chamber, as shown in the figure, food partially enters the detection area. The average temperature is acquired together with the other parts, the temperature of the complete food is not acquired, and a temperature lower than the food temperature is detected.

  Specifically, a case where one potato is heated will be described as an example.

  Normally, heating can be performed appropriately by heating at 600 W for 4 minutes, but it is assumed that the user sets 800 W for 10 minutes. After the start of heating, it took 2 minutes and 30 seconds for the atmospheric temperature of the heating chamber to rise by 10 ° C. The detection temperature of the food at this time was 95 ° C. Since 115 ° C. of threshold value 2 has not been reached, the heating power of 800 W is continued.

  Thereafter, as the heating continued, the food temperature rose and reached 115 ° C. in 6 minutes and 50 seconds. At this point, the heating power is lowered to 300 W and heating is continued. Since the heating power was reduced, the temperature rise of the food was suppressed, and when the set 10 minutes had passed, it reached 119 ° C., but there was no abnormal heating of potatoes.

In the present embodiment, the determination in step S6 is performed every 20 seconds at the start of heating, and is continuously acquired when the temperature in the heating chamber 1 rises by 10 ° C. or more and shifts to step S9. did. In the case of the automatic heating menu that detects the temperature of the food and stops heating, the temperature of the food is always monitored, but in the case of manual heating where the user sets the heating time and operates, temperature detection Therefore, the frequency of temperature detection is reduced to 1/5 and the durability of the driving device is taken into consideration, as compared with the case of the automatic heating menu. If the infrared sensor is driven when food is heated, the lens surface of the infrared sensor may be contaminated due to the scattering of food caused by the heated food being repelled. Considered.

  Moreover, in this Embodiment, when the heating time setting of a user was set longer than 3 minutes, it set so that the reciprocation operation | movement for food temperature detection might be performed for the first time. Usually, food is not heated abnormally by heating in a short time. In the case of warming drinks or reheating foods, it can be heated sufficiently in 3 minutes or less. Therefore, in the general range of use, there is no need to perform a reciprocating operation for detecting an abnormality. It has a structure that gives consideration to durability.

  As described above, even when the user mistakenly sets the heating power and heating time and starts heating, the temperature rise in the heating chamber 1 and a higher temperature than when normal food is heated are detected. Thus, by reducing the output power of the high-frequency output while preventing malfunction, abnormal heating of the food can be prevented and it can be used safely.

  As described above, according to the high-frequency heating device according to the present invention, even when a user starts heating with a large heating power for a small amount of food and a long heating time, abnormal heating can be prevented, Even when the user performs an intermediate operation to improve cooking performance, a safe and reliable high-frequency heating device can be provided without being cut quickly.

1 Heating chamber 5 Infrared sensor (surface temperature detection means)
6 Drive motor 7 Heating chamber thermistor (internal temperature detection means)
8 Controller 15 Magnetron (High-frequency generator)

Claims (5)

A heating chamber for storing food, high-frequency generating means for generating a high frequency for dielectrically heating the food in the heating chamber, and detecting the temperature of the food in the heating chamber disposed outside the wall surface of the heating chamber in a non-contact manner Surface temperature detection means, internal temperature detection means for detecting the atmospheric temperature in the heating chamber, internal steam detection means for detecting the amount of steam in the heating chamber, the surface temperature detection means, internal temperature detection means, And a control unit for controlling the output of the high-frequency generation means based on the output from the internal steam detection means,
When the user sets an arbitrary time and inputs a heating start operation, the control unit determines whether the food is small or large, and changes the threshold depending on whether the food is small or large. Abnormal heating is detected to lower the output level of the high frequency generating means, and when the amount of steam in the heating chamber is less than a predetermined value when the amount of food is small, the high frequency generating means is stopped. A high-frequency heating device. When the user sets an arbitrary time and inputs a heating start operation, the control unit determines whether the food is small or large, and changes the threshold value depending on whether the food is small or large. The high-frequency heating device according to claim 1, wherein heating is detected, but the threshold value is stored during cooking. When the user sets an arbitrary time and inputs a heating start operation, the control unit determines whether the food is small or large, and changes the threshold value depending on whether the food is small or large. Detects heating, but monitors whether the door is opened depending on the cooking state, continues to memorize the threshold value of whether the food is small or large when the door is opened, and inputs the heating start operation again In this case, the high-frequency heating apparatus according to claim 1 or 2, wherein abnormal heating of the food is detected based on a threshold value of a small amount or a large amount of food stored at the beginning of heating. When the user sets an arbitrary time and inputs a heating start operation, the control unit determines whether the food is small or large, and changes the threshold value depending on whether the food is small or large. Detects heating, but detects abnormal heating of food with a small or large threshold of food stored at the beginning of cooking during cooking, but “Cancel” key is pressed or set heating operation time is reached The high-frequency heating device according to any one of claims 1 to 3, wherein the memory of the threshold value is canceled at the time. 5. The high-frequency heating device according to claim 1, wherein detection of an atmospheric temperature in the heating chamber and detection of a vapor amount in the heating chamber are performed by a single thermistor.