Cooking device

Abstract

To alleviate a rush current in a heating cooker which uses heaters having different characteristics, with an inexpensive structure.SOLUTION: A toaster oven 1 as a heating cooker has: a first heater 6; a second heater 7; a first relay 11 for turning on / off electric conduction to the first heater 6; a second relay 12 for turning on / off electric conduction to the second heater 7; and a relay drive circuit 13 for allowing each of the relays 11, 12 to operate. The first heater 11 is a halogen lamp heater in which a resistance value change is large with respect to the temperature change. The second heater 7 is a carbon heater in which a resistance value change is small with respect to the temperature change. In the case where electricity is conducted to both first heater 6 and second heater 7, after turning on the first relay 11, the second relay 12 is turned on after the elapse of one second; thereby, the peak value of the rush current in the entire heater of the toaster oven 1 can be lowered.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a cooking device such as an oven toaster, and more particularly to a cooking device having a plurality of types of heaters.

Background Art

[0002] Conventionally, as this type of cooking device, there is known an oven toaster provided with a near-infrared heater having a radiation peak in a band with a wavelength of 1.5 μm or less and a far-infrared heater having a radiation peak in a band with a wavelength exceeding 1.5 μm, and having control means for energizing these heaters simultaneously or individually. And by adopting such a configuration, the inside of the cooking object can be heated by near-infrared rays, and at the same time, the surface of the cooking object can be burned by far-infrared rays, enabling faster cooking. Note that as the near-infrared heater, a lamp heater such as a halogen lamp heater is used.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, since the lamp heater has a large change in resistance value with respect to temperature change, immediately after energization, that is, when the temperature of the heater is low, the resistance value is low, and thus a large inrush current is generated immediately after energization. And there is a possibility that the breaker of the switchboard is tripped by this inrush current.

[0005] An object of the present invention is to solve the above problems and mitigate the inrush current in a cooking device using heaters with different characteristics with an inexpensive configuration.

Means for Solving the Problems

[0006] The cooking device according to claim 1 of the present invention is a cooking device having a first heater, a second heater, a first relay for turning on and off the power supply to the first heater, a second relay for turning on and off the power supply to the second heater, and a relay drive circuit for operating each relay. In this cooking device, the first heater is a heater having a large resistance value change with respect to a temperature change, the second heater is a heater having a small resistance value change with respect to a temperature change, and when power is supplied to both the first heater and the second heater, the relay drive circuit controls to turn on the second relay after a predetermined time after turning on the first relay.

[0007] Further, the cooking device according to claim 2 of the present invention is, in claim 1, characterized in that a plurality of the first heaters are provided in parallel, a plurality of first relays for turning on and off the power supply to these first heaters are provided, and the relay drive circuit controls to turn on the plurality of first relays with a predetermined time difference.

[0008] Furthermore, the cooking device according to claim 3 of the present invention is, in claim 1, characterized in that the first heater is a lamp heater and the second heater is a carbon heater.

Advantages of the Invention

[0009] By configuring the cooking device according to Claim 1 of the present invention as described above, first, after energizing the first heater with a large resistance value change with respect to temperature change, the second heater with a small resistance value change with respect to temperature change is energized. An inrush current is generated at the moment when the first heater is energized, but since the second heater is not energized at this moment, the peak value of the inrush current can be reduced by the amount of current flowing through the second heater. And after a predetermined time has elapsed, the second heater is energized, but almost no inrush current is generated in this second heater. Therefore, almost no inrush current is generated at the moment when all the heaters are in the energized state. As a result, the peak value of the inrush current of the entire heater can be lowered, and the risk of the breaker in the switchboard being tripped can be reduced.

[0010] In addition, a plurality of the first heaters are provided in parallel, and a plurality of first relays for turning on and off the power supply to these first heaters are provided. By controlling the relay drive circuit to turn on the plurality of first relays with a predetermined time difference, if the total output of the first heaters is the same, compared to the case where there is a single first heater, the peak value of the individual inrush current of the first heaters can be lowered, and the timing at which the inrush current is generated can be dispersed. Therefore, the peak value of the inrush current of the entire heater of the cooking device can be lowered.

[0011] Furthermore, by using the first heater as a lamp heater and the second heater as a carbon heater, while suppressing the peak value of the inrush current of the entire heater, infrared rays with different wavelength characteristics can be generated, and the object to be cooked in the cooking device can be cooked well.

Brief Description of the Drawings

[0012]

Figure 1

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Mode for Carrying Out the Invention

[0013] Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. 1 is an oven toaster as a cooking device of the present invention. This oven toaster 1 is configured to include a main body 2 and a door body 3. The main body 2 has a firing chamber 4 formed therein and an opening 5 on the front side. And this opening 5 can be opened and closed by the door body 3. Further, a first heater 6, a second heater 7, and a baking net 8 are provided in the firing chamber 4. The first heater 6 is provided below the baking net 8. The second heater 7 is provided above the baking net 8. Further, the baking net 8 is configured to be pulled forward as the door body 3 is opened and pushed backward as the door body 3 is closed. Note that 9 is a handle for gripping when opening and closing the door body 3.

[0014] The first heater 6 is a lamp heater, and in this embodiment, it is what is called a halogen lamp heater. Although not shown, a halogen lamp heater is one in which a filament such as tungsten is inserted into a glass tube and a halogen gas is enclosed in the glass tube. That is, it can be said that the halogen lamp heater has the same structure as an incandescent light bulb. And tungsten, which is the material of the filament of the halogen lamp heater, has the property that its electrical resistance value increases as the temperature rises, and the electrical resistance value at the temperature during heat generation is 10 times or more that at room temperature with respect to the electrical resistance value at room temperature. Therefore, a large inrush current easily flows at the moment of starting energization in the first heater 6 which is a halogen lamp heater. On the other hand, the second heater 7 is a carbon heater. Although not shown, a carbon heater is one in which a carbon heating element is inserted into a glass tube and an inert gas is enclosed in the glass tube. And the difference between the electrical resistance value at room temperature and the electrical resistance value at the temperature during heat generation of the carbon heating element is small. Therefore, almost no inrush current flows at the start of energization in the second heater 7 which is a carbon heater.

[0015] Figure 2 is a schematic explanatory diagram of the electric circuit of the oven toaster 1. As shown in this figure, the first heater 6 and the second heater 7 are connected in parallel to an AC power supply 10. And a first relay 11 is connected in series with the first heater 6. Similarly, a second relay 12 is connected in series with the second heater 7. Note that the first relay 11 and the second relay 12 are normally open types respectively. And a relay drive circuit 13 for operating these relays 11, 12 is provided. Note that 14 is a control circuit, 15 is an operation unit, 16 is a display unit, and 17 is a temperature sensor that detects the temperature in the baking chamber 4.

[0016] Next, the operation of this embodiment will be described. First, the user connects a power plug (not shown) to the AC power supply 10, opens the door body 3, places food such as bread to be cooked on the wire mesh 8, and then closes the door body 3. Then, by operating the operation unit 15, the control circuit 14 turns on each of the normally open relays 11 and 12 via the relay drive circuit 13. More specifically, the relay drive circuit 13 first turns on the first relay 11 and turns on the second relay 12 one second later.

[0017] By turning on each of the relays 11 and 12 in this way, a current as shown in FIG. 3 flows through the entire heater of the oven toaster 1. That is, at the moment when the first relay 11 is turned on, an inrush current flows into the first heater 6. At this point, the current flowing through the first heater 6 becomes the current flowing through the heater of the oven toaster 1. The inrush current at this time is the inrush current flowing through only the first heater 6, so it can be relatively small and suppressed. Then, this inrush current decreases with time. And the current flowing through the heater of the oven toaster 1 converges to the rated current value of the first heater 6 within 1 second until the second relay 12 is turned on. Next, when the second relay 12 is turned on, no inrush current flows through the second heater 7, and a current of the rated current value flows from the beginning. At this point, current flows through all the heaters of the oven toaster 1. Therefore, at the moment when the second relay 12 is turned on, a current equal to the total value of the rated current values of each heater flows through the entire heater of the oven toaster 1.

[0018] In this way, when the first heater 6 and the second heater 7 are energized and the temperature in the baking chamber 4 rises, the first heater 6 and the second heater 7 are turned on and off based on the temperature in the baking chamber 4 detected by the temperature sensor 17. At this time, depending on the content of the program, the first heater 6, which is a halogen lamp heater that emits a large amount of near-infrared rays, and the second heater 7, which is a carbon heater that emits a large amount of far-infrared rays, are individually turned on and off, so they are not necessarily turned on and off at the same timing. However, when both the first heater 6 and the second heater 7 are about to change from the off state to the on state at the same time, similar to the start of heating, after turning on the first relay 11 to energize the first heater 6, the second relay 12 is turned on with a 1-second interval to energize the second heater 7. Also, when it is time to energize the first heater 6 during the energization of the second heater 7, as shown in FIG. 4, the second relay 12 may be turned off once, then the first relay 11 may be turned on, and the second relay 12 may be turned on again 1 second later. Even during the on-off control of the first heater 6, an inrush current flows through the first heater 6 at the moment when the first relay 11 is turned on. Therefore, by energizing the first heater 6 and the second heater 7 with a time difference, the inrush current of the entire heater of the oven toaster 1 can be mitigated. However, unlike the start of heating, since the filament of the first heater 6 is slightly warm, the inrush current during on-off control is smaller than the inrush current at the start of heating.

[0019] In this way, the first heater 6, which is a halogen lamp heater that emits a large amount of near-infrared rays, and the second heater 7, which is a carbon heater that emits a large amount of far-infrared rays, can well heat the object to be cooked, such as bread, placed on the baking net 8. In particular, by appropriately controlling the first heater 6 and the second heater 7, the object to be cooked can be appropriately heated according to the type of the object to be cooked.

[0020] As described above, in the oven toaster 1 as a cooking device having a first heater 6, a second heater 7, a first relay 11 for turning on and off the power supply to the first heater 6, a second relay 12 for turning on and off the power supply to the second heater 7, and a relay drive circuit 13 for operating each of the relays 11 and 12, the first heater 11 is a halogen lamp heater having a large change in resistance value with respect to temperature change, the second heater 7 is a carbon heater having a small change in resistance value with respect to temperature change, and when power is supplied to both the first heater 6 and the second heater 7, the relay drive circuit 13 controls to turn on the second relay 12 one second after turning on the first relay 11, thereby reducing the peak value of the inrush current of the entire heater of the oven toaster 1 and reducing the risk of the breaker in the switchboard being tripped.

[0021] Further, according to the present invention, by using the first heater 6 as a halogen lamp heater and the second heater 7 as a carbon heater, while suppressing the peak value of the inrush current of the entire heater of the oven toaster 1 to be low, infrared rays having different wavelength characteristics are generated, and the object to be cooked in the oven toaster 1 can be cooked well by heating.

[0022] Next, a second embodiment of the present invention will be described with reference to FIGS. 5 to 8. 21 is an oven toaster as a cooking device of the present invention. This oven toaster 21 is configured to include a main body 22 and a door body 3. The main body 22 has a firing chamber 24 formed therein and an opening 25 on the front side. And this opening 25 can be opened and closed by the door body 3. Further, in the firing chamber 24, two first heaters 26a, 26b, two second heaters 27a, 27b, and a baking net 8 are provided. The first heaters 26a, 26b are arranged side by side in the front-rear direction below the baking net 8. Also, the second heaters 27a, 27b are arranged side by side in the front-rear direction above the baking net 8. Further, the baking net 8 is configured to be pulled forward as the door body 3 opens and pushed backward as the door body 3 closes. Note that 9 is a handle for gripping when opening and closing the door body 3.

[0023] Both of the first heaters 26a, 26b are lamp heaters, and in the case of this embodiment, both are called halogen lamp heaters. Although not shown, a halogen lamp heater is one in which a filament such as tungsten is inserted into a glass tube and a halogen gas is sealed in the glass tube. That is, it can be said that the halogen lamp heater has the same structure as an incandescent light bulb. And tungsten, which is the material of the filament of the halogen lamp heater, has the property that its electrical resistance value increases as the temperature rises, and the electrical resistance value at the temperature during heat generation is 10 times or more that at room temperature. Therefore, a large inrush current easily flows through the first heaters 26a, 26b, which are halogen lamp heaters, at the moment of starting energization. On the other hand, both of the second heaters 27a, 27b are carbon heaters. Although not shown, a carbon heater is one in which a carbon heating element is inserted into a glass tube and an inert gas is sealed in the glass tube. And the difference between the electrical resistance value at room temperature and the electrical resistance value at the temperature during heat generation of the carbon heating element is small. Therefore, almost no inrush current flows through the second heaters 27a, 27b, which are carbon heaters, at the start of energization.

[0024] FIG. 6 is a schematic explanatory diagram of the electric circuit of the oven toaster 21. As shown in this figure, the first heaters 26a and 26b and the second heaters 27a and 27b are connected in parallel to the AC power supply 10. Also, the first heater 26a and the first heater 26b are also connected in parallel to the AC power supply 10. Note that the second heaters 27a and 27b are connected in series. Then, a first relay 31a is connected in series with the first heater 26a. Similarly, a first relay 31b is connected in series with the first heater 26b. Further, a second relay 32 is connected in series with the series circuit of the second heaters 27a and 27b. Note that the first relays 31a and 31b and the second relay 32 are normally open types. And a relay drive circuit 33 for operating these relays 31a, 31b, and 32 is provided. Note that 14 is a control circuit, 15 is an operation unit, 16 is a display unit, and 17 is a temperature sensor that detects the temperature inside the baking chamber 24.

[0025] Next, the operation of this embodiment will be described. First, the user connects a power plug (not shown) to the AC power supply 10, opens the door body 3, places food bread or the like, which is an object to be cooked, on the baking net 8, and then closes the door body 3. Then, by operating the operation unit 15, the control circuit 14 turns on each of the normally open relays 31a, 31b, and 32 via the relay drive circuit 33. More specifically described, the relay drive circuit 33 first turns on the first relay 31a, turns on the first relay 31b one second later, and further turns on the second relay 32 one second after that.

[0026] By turning on each of the relays 31a, 31b, and 32 in this manner, a current as shown in FIG. 7 flows through the entire heater of the oven toaster 21. That is, at the moment when the first relay 31a is turned on, an inrush current flows into the first heater 26a. At this point, the current flowing through the first heater 26a becomes the current flowing through the heater of the oven toaster 21. The inrush current at this time is the inrush current flowing through one of the first heaters 26a, so it can be relatively small and suppressed. And this inrush current decreases with time. And the current flowing through the heater of the oven toaster 21 converges to the rated current value of the first heater 26a within 1 second until the first relay 31b is turned on. Next, at the moment when the first relay 31b is turned on, an inrush current flows into the first heater 26b. At this point, the current flowing through the first heaters 26a and 26b becomes the current flowing through the heater of the oven toaster 21. The inrush current at this time is the inrush current flowing through one of the first heaters 26b, so it can be relatively small and suppressed. And this inrush current decreases with time. And the current flowing through the heater of the oven toaster 21 converges to the total value of the rated current values of the first heaters 26a and 26b within 1 second until the second relay 32 is turned on. Further, when the second relay 32 is turned on, no inrush current flows through the second heaters 27a and 27b, and a current of the rated current value flows from the beginning. At this point, current flows through all the heaters of the oven toaster 21. Therefore, at the moment when the second relay 32 is turned on, a current equal to the total value of the rated current values of each heater flows through the entire heater of the oven toaster 21.

[0027] Thus, when the first heaters 26a and 26b and the second heaters 27a and 27b are energized and the temperature in the firing chamber 24 rises, the first heaters 26a and 26b and the second heaters 27a and 27b are turned on and off based on the temperature in the firing chamber 24 detected by the temperature sensor 17. At this time, depending on the content of the program, the first heaters 26a and 26b, which are halogen lamp heaters that emit a large amount of near-infrared rays, and the second heaters 27a and 27b, which are carbon heaters that emit a large amount of far-infrared rays, are individually turned on and off, so they are not necessarily turned on and off at the same timing. However, when the first heaters 26a and 26b are turned on and off, similar to the start of heating, the first relay 31a is turned on to energize the first heater 26a, and 1 second later, the first relay 31b is turned on to energize the first heater 26b. Even during the on / off control of the first heaters 26a and 26b, an inrush current flows through the first heaters 26a and 26b at the moment the first relays 31a and 31b are turned on. Therefore, by energizing the first heater 26a and the first heater 26b with a time difference, the inrush current of the entire heater of the oven toaster 21 can be mitigated. However, unlike the start of heating, since the filaments of the first heaters 26a and 26b are slightly warmed up, the inrush current during on / off control is smaller than the inrush current at the start of heating. Note that when turning off the first heaters 26a and 26b during on / off control, the timing of turning both of them off may be simultaneous or shifted by 1 second.

[0028] In addition, when it is time to energize the first heaters 26a and 26b during the energization of the second heaters 27a and 27b, first, the first relay 31a is turned on to energize the first heater 26a, and 1 second later, the first relay 31b is turned on to energize the first heater 26b. In this case, since the inrush currents generated individually in the first heaters 26a and 26b are relatively small, the peak value of the inrush current can be lowered for the entire heater of the oven toaster 21. Also, in this case, as shown in FIG. 8, after once turning off the second relay 32, the first relay 31a may be turned on, the first relay 31b may be turned on 1 second later, and the second relay 12 may be turned on again 1 second later. By controlling in this way, the peak value of the inrush current can be made even lower for the entire heater of the oven toaster 21.

[0029] In this way, the first heaters 26a and 26b, which are halogen lamp heaters that emit a large amount of near-infrared rays, and the second heaters 27a and 27b, which are carbon heaters that emit a large amount of far-infrared rays, can satisfactorily heat the object to be cooked, such as bread, placed on the baking net 8. In particular, by appropriately controlling the first heaters 26a and 26b and the second heaters 27a and 27b, the object to be cooked can be appropriately heated according to the type of the object to be cooked.

[0030] As described above, in the oven toaster 21 as a cooking device having the first heaters 26a and 26b, the second heaters 27a and 27b, first relays 31a and 31b for turning on and off the power supply to the first heaters 26a and 26b, a second relay 32 for turning on and off the power supply to the second heaters 27a and 27b, and a relay drive circuit 33 for operating each of the relays 31a, 31b, and 32, the first heaters 31a and 31b are halogen lamp heaters having a large change in resistance value with respect to temperature change, the second heaters 27a and 27b are carbon heaters having a small change in resistance value with respect to temperature change, and when power is supplied to both the first heaters 26a and 26b and the second heaters 27a and 27b, the relay drive circuit 33 controls to turn on the second relay 32 one second after turning on the first relays 31a and 31b, thereby reducing the peak value of the inrush current of the entire heaters of the oven toaster 21 and reducing the risk of the breaker in the switchboard being tripped.

[0031] The present invention also provides two of the first heaters 26a and 26b in parallel, provides two first relays 31a and 31b for turning on and off the power supply to these first heaters 26a and 26b respectively, and the relay drive circuit 33 controls to turn on the plurality of first relays 31a and 31b with a time difference of one second. If the total output of the plurality of first heaters 26a and 26b is the same as the output of the single first heater 6 shown in the first embodiment, compared with the first heater 6, the peak value of the individual inrush current of the first heaters 26a and 26b can be reduced, and the timing at which the inrush current occurs can be dispersed. Therefore, the peak value of the inrush current of the entire heaters of the oven toaster 21 can be made lower.

[0032] Furthermore, according to the present invention, by using the first heaters 6a and 6b as halogen lamp heaters and the second heaters 7a and 7b as carbon heaters, while suppressing the peak value of the inrush current of the entire heaters of the oven toaster 21 to a low level, infrared rays with different wavelength characteristics can be generated, and the object to be cooked in the oven toaster 21 can be heated and cooked well.

[0033] Next, for comparison with this embodiment, the conventional technology will be described with reference to FIGS. 9 and 10. Note that, similar to the second embodiment, a structure having two first heaters and two second heaters is adopted.

[0034] Both of the first heaters 106a and 106b are lamp heaters, and in the case of this comparative example, both are called halogen lamp heaters. That is, as described in each of the above embodiments, a large inrush current easily flows through the first heaters 106a and 106b at the moment of starting energization. On the other hand, both of the second heaters 107a and 107b are carbon heaters. That is, as described in each of the above embodiments, almost no inrush current flows through the second heaters 107a and 107b at the start of energization.

[0035] FIG. 9 is a schematic explanatory diagram of the electric circuit of the oven toaster. As shown in this figure, the series circuit of the first heaters 106a and 106b and the series circuit of the second heaters 107a and 107b are connected in parallel to the AC power supply 10. And a first relay 111 is connected in series with the series circuit of the first heaters 106a and 106b. Similarly, a second relay 112 is connected in series with the series circuit of the second heaters 107a and 107b. Note that the first relay 111 and the second relay 112 are both normally open types. And a relay drive circuit 113 for operating these relays 111 and 112 is provided. Note that 114 is a control circuit, 115 is an operation unit, 116 is a display unit, and 117 is a temperature sensor for detecting the temperature inside the baking chamber.

[0036] Next, the operation of this comparative example will be described. First, the user connects a power plug (not shown) to the AC power supply 10, opens the door body, places food such as bread to be cooked on the baking net, and then closes the door body. Then, by operating the operation unit 115, the control circuit 114 turns on each of the normally open relays 111 and 112 via the relay drive circuit 113. More specifically, when the relay drive circuit 113 turns on the first relay 111, it simultaneously turns on the second relay 112.

[0037] By turning on each of the relays 111 and 112 simultaneously in this way, a current as shown in FIG. 10 flows through the entire heater of the oven toaster. That is, at the moment when the first relay 111 and the second relay 112 are turned on simultaneously, inrush currents flow into the first heaters 106a and 106b at the same time. The inrush current at this time is the sum of the inrush current flowing through the first heater 106a and the inrush current flowing through the first heater 106b, so it becomes relatively large. For this reason, depending on the specifications of the distribution board in the user's house, there is a risk that the breaker will trip. Note that this inrush current decreases with time. Then, the current flowing through the entire heater of the oven toaster converges to the sum of the rated current values of the first heaters 106a and 106b and the second heaters 107a and 107b.

[0038] As such, when the first heaters 106a and 106b and the second heaters 107a and 107b are energized and the temperature in the firing chamber rises, the first heaters 106a and 106b and the second heaters 107a and 107b are turned on and off based on the temperature in the firing chamber detected by the temperature sensor 117. At this time, depending on the content of the program, the first heaters 106a and 106b, which are halogen lamp heaters that emit a large amount of near-infrared rays, and the second heaters 107a and 107b, which are carbon heaters that emit a large amount of far-infrared rays, are individually turned on and off, so they are not necessarily turned on and off at the same timing. However, since the first heaters 106a and 106b are connected in series, when turning on and off the first heaters 106a and 106b, by turning on the first relay 111, the first heaters 106a and 106b are surely energized simultaneously. Also, there may be a timing when both the first heaters 106a and 106b and the second heaters 107a and 107b change from an off state to an on state almost simultaneously, or the first heaters 106a and 106b may be in an on state when the second heaters 107a and 107b are in an on state. Even during the on / off control of the first heaters 106a and 106b, at the moment when the first relay 111 is turned on, an inrush current flows through the first heaters 106a and 106b, so the inrush current of the entire heater of the oven toaster increases. Different from the start of heating, since the filaments of the first heaters 106a and 106b are slightly warmed up, although the inrush current during on / off control is smaller than the inrush current at the start of heating, it is the sum of the inrush currents of the two first heaters 106a and 106b, so there is no change that a large inrush current flows through the entire heater of the oven toaster.

[0039] Note that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the invention. For example, in the second embodiment, two first and second heaters are provided respectively, but three or more may be provided respectively, or the number of the first and second heaters may be different. Also, the types of the first heater and the second heater can be appropriately selected. Further, in each of the above embodiments, the interval of the energization start timing of each heater is 1 second, but the point is that sufficient time should be provided for the inrush current to converge to the rated current value, and other times, for example, 0.5 second or 2 seconds may be used. Furthermore, in the second embodiment, it is always controlled such that the first heater 26a is turned on first, but it may be controlled to be switched such that the first heater 26b is turned on first.

Explanation of Signs

[0040] 1,21 Oven toaster (heating and cooking device) 6,26a,26b First heater 7,27a,27b Second heater 11,31a,31b First relay 12,32 Second relay 13,33 Relay drive circuit

Claims

1. In a cooking heater apparatus having a first heater, a second heater, a first relay for turning on and off the power supply to the first heater, a second relay for turning on and off the power supply to the second heater, and a relay drive circuit for operating each of the relays, the first heater is a heater having a large change in resistance value with respect to a temperature change, the second heater is a heater having a small change in resistance value with respect to a temperature change, and when power is supplied to both the first heater and the second heater, the relay drive circuit controls to turn on the second relay after a predetermined time has elapsed after turning on the first relay. A cooking heater apparatus characterized by the above.

2. A plurality of the first heaters are provided in parallel, a plurality of first relays for turning on and off the power supply to these first heaters are provided, and the relay drive circuit controls to turn on the plurality of first relays with a predetermined time difference. The cooking heater apparatus according to claim 1, characterized by the above.

3. The cooking heater apparatus according to claim 1, characterized in that the first heater is a lamp heater and the second heater is a carbon heater.

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