High frequency heating device

Abstract

To detect failure of a magnetron by an infrared sensor in high accuracy.SOLUTION: A high frequency heating device includes: a magnetron generating high frequency waves for heating a material to be heated; an infrared sensor having a plurality of detection elements and detecting a surface temperature of the material to be heated; and a control part controlling power supply to the magnetron and stopping the operation of a power supply part. The control part determines that the magnetron is failed when a predetermined number or more of portions where the temperature of the material to be heated detected by the infrared sensor is a first predetermined temperature or lower are detected.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to a high frequency heating device, and in particular to a microwave oven that cooks food by microwave heating. [Background technology]

[0002] Some conventional microwave ovens detect abnormal oscillation of the magnetron on the circuit to perform a fault diagnosis of the magnetron. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-141888 Summary of the Invention [Problem to be solved by the invention]

[0004] However, there is room for improvement in detecting a malfunction of the magnetron using an infrared sensor when an object to be heated is heated by the oscillation of the magnetron.

[0005] The present disclosure is intended to solve the above-described conventional problems, and has an object to provide a high-frequency heating device that can accurately detect a magnetron failure using an infrared sensor. [Means for solving the problem]

[0006] The high frequency heating device disclosed herein comprises a magnetron that generates high frequency waves for heating an object to be heated, an infrared sensor having multiple detection elements that detects the surface temperature of the object to be heated, and a control unit that controls the power supply to the magnetron and stops operation of the power supply unit when a malfunction of the magnetron is detected, and the control unit determines that the magnetron has malfunctioned when a predetermined number or more of points where the temperature of the object to be heated detected by the infrared sensor is below a first predetermined temperature are detected. [Effects of the Invention]

[0007] According to the high frequency heating device of the present disclosure, it is possible to detect whether or not the magnetron is malfunctioning by detecting the temperature of the object to be heated with an infrared sensor. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a microwave oven according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view of the microwave oven shown in FIG. 1 with the door open. [Figure 3] FIG. 3 is a block diagram showing the main components for microwave heating in the microwave oven according to this embodiment. [Figure 4] FIG. 4 is a front view showing the microwave oven according to the present embodiment with the door open. [Figure 5] FIG. 5 is a side view showing the microwave oven according to the present embodiment with the door open. [Figure 6] FIG. 6 is a plan view showing a temperature detection area on the bottom surface of the heating chamber in the microwave oven according to the present embodiment. [Figure 7] FIG. 7 is a flowchart of the failure detection mode in the microwave oven according to the present embodiment. [Figure 8] FIG. 8 shows examples of NG and OK results in the failure detection mode of the microwave oven according to this embodiment. [Figure 9] FIG. 9 shows an example in which the temperature is detected when a decanter is placed in a number of different positions on the bottom surface of the heating chamber in the failure detection mode of the microwave oven according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] A high-frequency heating device according to a first aspect of the present disclosure comprises a magnetron that generates high-frequency waves for heating an object to be heated, an infrared sensor having multiple detection elements that detects the surface temperature of the object to be heated, and a control unit that controls the power supply to the magnetron and stops the power supply to the magnetron when a malfunction of the magnetron is detected, and the control unit can determine that the magnetron has malfunctioned when a predetermined number or more of points are detected where the temperature of the object to be heated detected by the infrared sensor is below a first predetermined temperature.

[0010] A high-frequency heating device according to a second aspect of the present disclosure is the same as that of the first aspect, but includes an operation unit for setting heating control of the high-frequency heating device, and by operating the operation unit to set a fault detection mode, it is possible to detect a fault in the magnetron. According to this aspect, when the user sets the mode to the fault detection mode, it is possible to detect whether or not the magnetron has failed by detecting the temperature of the object to be heated with an infrared sensor.

[0011] In the high-frequency heating device according to a third aspect of the present disclosure, in the first or second aspect, if the infrared sensor detects that the temperature of the object to be heated is equal to or lower than a second predetermined temperature in a predetermined number of locations immediately after starting to drive the magnetron, the control unit sets the heating time until determining that a malfunction has occurred to be longer than the heating time when the infrared sensor detects that the temperature of the object to be heated is equal to or lower than the second predetermined temperature in a predetermined number of locations. According to this aspect, it is possible to more accurately detect whether or not the magnetron has malfunctioned.

[0012] The high frequency heating device according to a fourth aspect of the present disclosure is the same as any one of the first to third aspects, and includes a display unit that displays the status of the cooking device, and when it is determined that the magnetron has failed, the display unit displays a message to that effect. According to this aspect, when it is determined that the magnetron has failed, it is possible to notify the user of this fact.

[0013] A high-frequency heating device according to a fifth aspect of the present disclosure is any one of the first to fourth aspects, in which the object to be heated is a liquid. According to this aspect, it is possible to accurately detect whether or not the magnetron has malfunctioned.

[0014] A radio-frequency heating device according to a sixth aspect of the present disclosure transmits the determination result to an information terminal via wireless communication in any of the first to fifth aspects. According to this aspect, the user can recognize whether the magnetron is malfunctioning using an information terminal separate from the radio-frequency heating device.

[0015] Hereinafter, a microwave oven that performs microwave heating will be described as an embodiment of the high-frequency heating device of the present disclosure with reference to the accompanying drawings.

[0016] The high-frequency heating device of the present disclosure is not limited to the configuration of the microwave oven described in the following embodiments. The high-frequency heating device of the present disclosure includes heating devices configured based on technical ideas equivalent to those described in the following embodiments, for example, heating devices having heating functions such as heat transfer, convection, radiation, and steam in addition to a configuration having only microwave heating function. Furthermore, the invention may be configured by freely combining multiple aspects described in the present embodiments.

[0017] (Embodiment 1) FIG. 1 is a perspective view showing a microwave oven 20 according to an embodiment of the present disclosure. FIG. 2 is a perspective view showing the microwave oven 20 shown in FIG. 1 with the door open. In addition to microwave heating using microwaves, the microwave oven 0 has the function of cooking food by heating methods such as heat transfer, convection, and radiation.

[0018] 1 and 2, microwave oven 20 as a high-frequency heating device includes main body 1 having heating chamber 5 in which an object to be heated is placed, and door 2 for opening and closing the opening on the front side of heating chamber 5. Handle 3 used when opening and closing door 2 is provided on the upper front surface of door 2.

[0019] On the front of door 2 are provided display unit 4a, which displays the heating status and state of microwave oven 20 and various other information, and operation unit 4b, which is equipped with a start button and the like for instructing the start of cooking. When the user operates operation unit 4b to input cooking conditions and the like and finally presses the start button, microwave oven 20 begins various heating sequences. In this way, operation unit 4b allows the user to set the heating control details of microwave oven 20, such as the cooking menu and course desired, heating time, heating output, and heating mode. The operation and display unit may be configured as a touch panel in which display unit 4a and operation unit 4b are integrated.

[0020] Fig. 3 is a block diagram showing the main components for microwave heating in microwave oven 20. As shown in Fig. 3, microwave oven 20 includes display unit 4a, operation unit 4b, control unit 10, magnetron 11, power supply unit 14, waveguide 12, and temperature detection unit 13.

[0021] The user inputs information such as cooking conditions using operation unit 4b. Magnetron 11 is a high-frequency generating unit that generates high-frequency waves (microwaves) for heating the object to be heated. Power is supplied to the magnetron from power supply unit 14, which is composed of an inverter circuit and supplies power from a commercial power source. Waveguide 12 is provided below the bottom surface of heating chamber 5 and guides the microwaves generated by magnetron 11 to a rotating antenna (not shown). The rotating antenna is provided below near the center of the bottom surface of heating chamber 5 and supplies microwaves into heating chamber 5 by rotating the directional antenna.

[0022] Microwave oven 20 of the present embodiment can perform uniform heating by supplying microwaves uniformly in all directions, and local heating by supplying microwaves intensively in a desired direction, depending on the method of controlling the rotating antenna.

[0023] The temperature detection unit 13 detects the temperature inside the heating chamber 5. The control unit 10 controls the power supply to the magnetron 11 in accordance with the information input by the operation unit 4b and the temperature information detected by the temperature detection unit 13, thereby controlling the driving of the magnetron 11.

[0024] In this embodiment, the temperature detection unit 13 includes a first temperature detection unit and a second temperature detection unit. As will be described later, the first temperature detection unit is an infrared sensor that detects the temperature of a temperature detection area 30 virtually provided on the bottom surface of the heating chamber 5. This infrared sensor can detect the surface temperature of the object to be heated.

[0025] The second temperature detection unit is a temperature sensor (for example, a thermistor (not shown)) that detects the ambient temperature inside the heating chamber 5 (hereinafter referred to as the temperature inside the chamber).

[0026] Microwave oven 20 may further include a temperature sensor (e.g., a thermistor (not shown)) for detecting the ambient temperature where the infrared sensor is provided. The temperature information detected by the infrared sensor is calibrated according to this ambient temperature information. In this way, control unit 10 obtains the internal temperature information, the temperature information of temperature detection area 30, and the ambient temperature information from temperature detection unit 13.

[0027] Control unit 10 obtains information such as cooking conditions inputted through operation unit 4b from operation unit 4b, and controls magnetron 11 that generates microwaves by controlling power supply unit 14 that controls the drive of the magnetron according to temperature information obtained from temperature detection unit 13, and cooks the food to be heated according to the set cooking conditions, etc. Furthermore, control unit 10 notifies the user by displaying the cooking status and completion of cooking on display unit 4a.

[0028] The microwaves generated by the magnetron 11 are supplied to the inside of the heating chamber 5 via the waveguide 12 and the rotary antenna, and microwave-heat the object to be heated.

[0029] In this embodiment, the rotating antenna and waveguide 12 are provided below the bottom surface. However, the present disclosure is not limited to this configuration, and they may be disposed above the ceiling surface of heating chamber 5. Also, multiple pairs of magnetron 11 and waveguide 12 may be provided.

[0030] The heating chamber 5, which stores the object to be heated inside the main body 1, is partitioned by five sides, left and right sides, a top surface, a bottom surface, and a back surface, as well as a door 2 provided at an opening on the front side. Hereinafter, in this embodiment, the opening side of the heating chamber 5 is defined as the front side, the back side as the back side, the top side as the upper side, and the bottom side as the lower side, and when viewing the heating chamber 5 from the front side, the right side is defined as the right side, and the left side is defined as the left side.

[0031] Microwave oven 20 may further include a grill heater (not shown) for heating the inside of heating chamber 5. The grill heater is installed on the top surface of heating chamber 5, for example.

[0032] Microwave oven 20 may further include a circulation fan for circulating air within heating chamber 5, and a convection heater (not shown) for heating the air circulated by the circulation fan.

[0033] Both the circulation fan and the convection heater are provided on the rear side of the rear surface of the heating chamber 5. The circulation fan has the function of sucking air out of the heating chamber 5 and sending air towards the heating chamber 5 through punched holes (not shown) formed in the rear surface of the heating chamber 5. This causes hot air to circulate within the heating chamber 5.

[0034] In addition to microwave heating, microwave oven 20 may be configured to use an oven tray used for oven heating and a grill tray used for grill heating. In order to support the grill tray and oven tray, multiple stages (three stages in this embodiment) of support protrusions extending horizontally in the front-to-rear direction may be provided on the right and left side surfaces of heating chamber 5. This makes it possible to place a tray on which to place an object to be heated in the optimum position for cooking.

[0035] Fig. 4 is a front view of microwave oven 20 with door 2 open. Fig. 5 is a side view of microwave oven 20 of the embodiment with door 2 open. Fig. 5 shows main body 1 with a portion cut away so that the inside of heating chamber 5 can be seen.

[0036] 4 and 5, the infrared sensor 6 is provided on the outside of the upper right side of the heating chamber 5, and the field of view 35 of the infrared sensor 6 covers almost the entire bottom surface of the heating chamber 5. The infrared sensor 6 has a plurality of detection elements, and in this case is composed of a total of 64 infrared detection elements arranged in a matrix of 8 rows and 8 columns.

[0037] Fig. 6 is a plan view of the bottom surface of heating chamber 5. As shown in Fig. 6, almost the entire bottom surface of heating chamber 5 corresponds to temperature detection area 30. Temperature detection area 30 is an area where temperature can be detected by infrared sensor 6 included in temperature detection unit 13.

[0038] 4 and 5, when infrared sensor 6 is in operation, the lens of infrared sensor 6 is set at a predetermined depression angle so that field of view 35, indicated by the dashed line, covers the entire temperature detection area 30. In this state (hereinafter referred to as the detectable state), infrared sensor 6 detects temperature information of the object to be heated placed in heating chamber 5 through opening 5a formed in the upper right side surface of heating chamber 5.

[0039] The temperature detection area 30 is made up of sections 31 arranged in a matrix of 8 rows and 8 columns. Temperature information for each section of the temperature detection area 30 can be detected by associating 64 infrared detection elements that make up the infrared sensor 6 with each section.

[0040] That is, microwave oven 20 is configured so that temperatures for all 64 compartments can be detected at once.

[0041] As shown in Figure 6, in this embodiment, almost the entire bottom surface of the heating chamber 5 corresponds to the temperature detection area 30, but this is not limited to this, and for example, only a portion of the bottom surface of the heating chamber 5 may be the temperature detection area 30.

[0042] Infrared sensor 6 is configured so that its field of view 35 can be moved up and down by changing the depression angle around a horizontal rotation axis. In this embodiment, infrared sensor 6 moves field of view 35 in accordance with cooking conditions.

[0043] For example, under cooking conditions in which an object to be heated placed on the bottom surface of the heating chamber 5 is heated by microwaves, the orientation of the lens of the infrared sensor 6 is changed so that the entire bottom surface of the heating chamber 5 becomes the temperature detection area 30, and the field of view 35 is aligned with the entire temperature detection area 30.

[0044] When the infrared sensor 6 is not detecting temperature, the lens of the infrared sensor 6 is configured to face directly downward (standby state). This prevents dirt from adhering to the lens surface. When the infrared sensor 6 is in standby state, the entire infrared sensor 6 is configured to be cooled by cooling air. Because the entire infrared sensor 6 is cooled in standby state, accurate temperature detection is possible the next time temperature is detected.

[0045] The cooling air for cooling the infrared sensor 6 is the same as the cooling air for the magnetron 11 that generates microwaves, and is blown onto the infrared sensor 6 from below through a cooling duct.

[0046] If the thermistor and infrared sensor included in the temperature detection unit 13 detect an abnormal temperature, the control unit 10 is configured to stop the operation of the magnetron 11 immediately. [Heating operation of heated object] Next, microwave oven 20 configured as described above can execute a warming operation, which is a heating sequence for automatically heating an object to a desired temperature. Specific examples of objects suitable for the warming operation include cold rice and cooked side dishes.

[0047] In the following description, all control, judgment, calculation, etc. are performed by the control unit 10.

[0048] In the microwave oven 20, the heating operation is started by the user selecting the heating time and heating output on the operation unit 4b, selecting the heating menu for the desired object to be heated, and pressing a predetermined button (start button) on the operation unit 4b. Alternatively, the user may operate the display unit 4a to select the heating time and heating output, or select a heating menu for the desired object to be heated.

[0049] When the user gives an instruction to start the heating operation, the thermistor (second temperature detection unit) and infrared sensor (first temperature detection unit) of temperature detection unit 13 detect the temperature inside heating chamber 5. As time passes, the temperature of temperature detection unit 13 rises, and when it reaches a predetermined temperature, control unit 10 stops the power supply from power supply unit 14 to magnetron 11, stops driving magnetron 11, and ends heating.

[0050] Furthermore, if the internal temperature exceeds, for example, 260°C, an error message is displayed on the display unit 4a, the magnetron 11 is stopped, and the user is notified that the "heating operation" cannot be performed. The internal temperature range, with an upper limit of 260°C, may be changed as appropriate depending on the use of the microwave oven, etc. [Magnetron failure detection mode] The magnetron 11 failure detection mode will be described with reference to the flowchart of FIG. 7. In microwave oven 20 having the basic configuration described above, 1 L (liter) of water is placed in decanter 40, which is then placed in heating chamber 5 and placed on the bottom plate of heating chamber 5. Door 2 is then closed, and operation unit 4b is operated to change the display on display unit 4a, selecting a selection screen suggesting the magnetron 11 failure detection mode. When the start button on operation unit 4b is then pressed, the failure detection mode is initiated and heating begins (S001). Note that while tap water is placed in decanter 40, any liquid containing water, such as a seasoning liquid, may also be used.

[0051] Here, decanter 40 may be substituted with a large cup having a capacity of about 1 L, and the amount of water may be about 100 ml more or less than 1 L. Also, although the selection screen suggesting the failure detection mode is selected on display unit 4a, operation unit 4b may be provided with an operation button suggesting the failure detection mode, and the failure detection mode may be selected by pressing that operation button.

[0052] When the failure detection mode is initiated, the control unit 10 causes the magnetron 11 to output 1500 W (S002). Here, in order to determine whether or not a failure has occurred as quickly as possible, heating is performed at an output of 1500 W, but an output of 800 W or more is sufficient.

[0053] The infrared sensor (first temperature detection unit) of the temperature detection unit 13 detects the temperature of almost the entire bottom surface of the heating chamber 5 (temperature detection area 30). It is then determined whether two or more of the 64 compartments have a temperature of 10°C or less (S003). If two or more compartments have a temperature of 10°C or less, heating is performed for 5 minutes 45 seconds (predetermined time A) (S004). If there are fewer than two compartments with a temperature of 10°C or less, heating is performed for 5 minutes 30 seconds (predetermined time B) (S005). In other words, the magnetron 11 is driven for a longer time when there are two or more compartments with a temperature of 10°C or less than when there are fewer than two compartments (predetermined time A > predetermined time B). Here, this temperature of 10°C is defined as the second predetermined temperature. It is acceptable for the second predetermined temperature to be within 10°C ± 1°C.

[0054] After a predetermined time A or B has elapsed, the infrared sensor (first temperature detection unit) of the temperature detection unit 13 again detects the temperature of almost the entire bottom surface (temperature detection area 30) of the heating chamber 5 (S006). It is then determined whether or not three or more of the 64 compartments have a temperature of 90°C or higher (S007). If three or more compartments have a temperature of 90°C or higher, heating is stopped (S008), and a message is displayed on the display unit 4a indicating that the magnetron 11 is normal (by displaying words or graphics such as "OK" or "No problem", or by displaying the numbers 000) (S009). If there are fewer than three compartments with a temperature of 90°C or higher, the control unit 10 stops the power supply to the magnetron 11 to stop heating, and a message is displayed on the display unit 4a indicating that the magnetron 11 is abnormal (by displaying words or graphics such as "NG", "fault", "abnormal", or "problem", or by displaying the numbers 111). Here, this temperature of 90°C is defined as the first predetermined temperature. There is no problem with the second predetermined temperature as long as it is within 90°C ± 2°C.

[0055] When heating is performed with the magnetron 11 output at 800 W, the same effect can be obtained by extending the above-mentioned predetermined time A and predetermined time B by about 30%.

[0056] Next, referring to FIG. 8, a case where the magnetron 11 is normal and a case where the magnetron 11 is abnormal will be described.

[0057] In NG Example 1, NG Example 2, and NG Example 3, magnetron 11 is output at 1500W.

[0058] In NG example 1, the room temperature is 30°C, 1 L of tap water is placed in decanter 40, and the water temperature is 13°C. Temperature detection is performed as described in S003 of the above flow (first temperature detection scan). At this time, there are five compartments with temperatures below 10°C, so heating is operated for 5 minutes and 45 seconds (predetermined time A). After the predetermined time A has elapsed, temperature detection is performed as described in S006 of the above flow (second temperature detection scan). At this time, of all the compartments, only one compartment has a maximum temperature of 70°C, and there are fewer than three compartments with temperatures above 90°C, so it is determined that magnetron 11 is abnormal.

[0059] In NG example 2, the room temperature is 30°C, 1 L of tap water is placed in decanter 40, and the water temperature is 30°C. Temperature detection is performed as described in S003 of the above flow (first temperature detection scan). At this time, there are no compartments below 10°C, so heating is operated for 5 minutes and 30 seconds (predetermined time B). After predetermined time B has elapsed, temperature detection is performed as described in S006 of the above flow (second temperature detection scan). At this time, there is only one compartment with a maximum temperature of 92°C among all the compartments, and none of the remaining compartments reach 90°C, so there are less than three compartments above 90°C, so it is determined that magnetron 11 is abnormal.

[0060] In OK example 1, the room temperature is 10°C, 1 L of tap water is placed in decanter 40, and the water temperature is 10°C. Temperature detection is performed as described in S003 of the above flow (first temperature detection scan). At this time, there are 56 compartments with temperatures below 10°C, so heating is operated for 5 minutes and 45 seconds (predetermined time A). After the predetermined time A has elapsed, temperature detection is performed as described in S006 of the above flow (second temperature detection scan). At this time, there are seven compartments with a maximum temperature of 94°C among all the compartments, and three or more compartments have a maximum temperature of 90°C or higher, so it is determined that magnetron 11 is normal.

[0061] 9, the inventors also conducted experiments to detect the temperature when decanter 40 was placed in multiple locations on the bottom surface of heating chamber 5. In Figures 9(a) and (d), temperature detection was performed with decanter 40 placed on the left rear side of the bottom surface of heating chamber 5, in Figures 9(b) and (e), temperature detection was performed with decanter 40 placed in the center of the bottom surface of heating chamber 5, and in Figures 9(c) and (f), temperature detection was performed with decanter 40 placed on the right front side of the bottom surface of heating chamber 5.

[0062] In (a) to (c) of Figure 9, when the temperature detection described in S003 of the above flow is performed (first temperature detection scan), the temperature near decanter 40 indicates 7°C to 10°C, and the temperatures of all compartments other than the compartments marked with numbers are above 10°C. In experiments conducted by the inventors, even in these cases, if there are three or more compartments out of 64 compartments with a temperature of 90°C or higher, the temperature rise is sufficient, and it was confirmed that magnetron 11 is normal. If there are fewer than three compartments with a temperature of 90°C or higher, the temperature rise is insufficient, and it was confirmed that magnetron 11 is abnormal.

[0063] In addition, in (d) to (f) of FIG. 9, the temperature detection explained in S003 of the above flow is performed. In this case (first scan of temperature detection), the temperature near decanter 40 is 14°C to 16°C, and the temperatures in the compartments other than the compartments with numbers are above 16°C. In the experiments conducted by the inventors, even in these cases, if there are three or more compartments out of 64 compartments with a temperature of 90°C or higher, the temperature rise is sufficient, and it was confirmed that magnetron 11 is normal. If there are less than three compartments with a temperature of 90°C or higher, the temperature rise is insufficient, and it was confirmed that magnetron 11 is abnormal.

[0064] In this way, it was found that whether or not the magnetron 11 has malfunctioned can be determined in the same manner even if the water temperature in the decanter 40 changes depending on the season.

[0065] 3, a communication unit (not shown) including a WIFI-compatible semiconductor and communication circuit capable of communicating with control unit 10 may be provided, and a server (not shown) may be accessible via a router (not shown) capable of wireless communication with the communication unit. The determination result of the malfunction detection of magnetron 11 may be transmitted from microwave oven 20 via the server to an information terminal device such as a user's smartphone, or to an information terminal device such as a cash register of a store's POS system or a managing personal computer, allowing the user or a store clerk to check the result of the malfunction detection of magnetron 11 wirelessly.

[0066] Any of the above-described various embodiments may be combined appropriately to achieve the effects of each of them. [Industrial Applicability]

[0067] The high-frequency heating device of the present disclosure has a simple configuration and can accurately determine magnetron failure, and therefore this high-frequency heating device is useful not only in home microwave ovens but also in commercial microwave ovens, for example. [Explanation of symbols]

[0068] 1 Main unit 2-door 3 handle 4a Display section 4b Operation section 5 Heating chamber 6 Infrared Sensor 10 Control Unit 11. Magnetron 12 Waveguide 13 Temperature detection unit 20 Microwave 31 plots 30 Temperature detection area 35 field of view 40 Decanter (object to be heated)

Claims

1. a magnetron that generates high frequency waves to heat an object to be heated; an infrared sensor having a plurality of detection elements for detecting the surface temperature of an object to be heated; a control unit that controls the power supply to the magnetron and stops the power supply to the magnetron when a failure of the magnetron is detected, The control unit determines that the magnetron has failed when a predetermined number of locations where the temperature of the heated object detected by the infrared sensor is below a first predetermined temperature are detected.

2. 2. The high-frequency heating device according to claim 1, further comprising an operation unit for setting heating control of the high-frequency heating device, wherein the operation unit can be operated to set a failure detection mode, thereby making it possible to detect a failure of the magnetron.

3. 3. The high-frequency heating device according to claim 1, wherein, when a predetermined number or more of the points where the temperature of the heated object detected by the infrared sensor is equal to or lower than a second predetermined temperature are detected immediately after starting to drive the magnetron, the control unit sets a heating time until determining a fault to be longer than when less than the predetermined number of points where the temperature of the heated object is equal to or lower than the second predetermined temperature are detected.

4. 3. The high frequency heating device according to claim 1, further comprising a display unit that displays a state of the high frequency heating device, and when it is determined that the magnetron has failed, the display unit displays a message indicating that the magnetron has failed.

5. 2. The high frequency heating device according to claim 1, wherein the object to be heated is a liquid.

6. 2. The high frequency heating device according to claim 1, wherein the determination result is transmitted to an information terminal via wireless communication.

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