Oven, oven with probe, and cooking system

Abstract

To achieve both noise countermeasures and accurate measurement of the temperature of an object to be cooked (a cooking object).SOLUTION: An oven 10 includes: a housing 16; a voltage divider resistor; and a control unit 13. The housing 16 is provided with a socket 30C with which a meat probe 30 including a thermistor TH is electrically and mechanically connectable. The voltage divider resistor is electrically connected in series with the thermistor TH to be located on an upper side with respect to the thermistor TH between a constant voltage power supply circuit and a signal ground SG1 when the meat probe 30 is connected to the socket 30C. The control unit 13 calculates a temperature of a cooking object with which the meat probe 30 contacts, on the basis of a voltage between the signal ground SG1 and a connection point between the voltage divider resistor and the thermistor TH.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an oven, an oven with a probe and a cooking system. [Background technology]

[0002] Patent Document 1 discloses a meat probe in which a first sensor unit for detecting the internal temperature of food is provided inside the tip of a metal rod. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 63-075419 Summary of the Invention [Problem to be solved by the invention]

[0004] The heating device to which the meat probe of Patent Document 1 is connected is provided with a terminal to which a temperature signal from the meat probe is input and a reference potential terminal connected to a line corresponding to the reference potential of the temperature signal. In the heating device of Patent Document 1, the temperature signal from the meat probe is pulled down. Generally, the reference potential terminal is sometimes grounded to prevent noise, etc. In this case, if a resistance component such as parasitic resistance occurs between the temperature signal line and the ground, the accuracy of the temperature calculation may decrease.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide an oven, an oven with a probe, and a cooking system that can achieve both noise countermeasures and accurate temperature measurement of the object being cooked. [Means for solving the problem]

[0006] The oven according to the present invention includes a housing, a voltage dividing resistor, and a temperature calculation unit. The housing is provided with a connector to which a temperature detection probe including a thermistor can be electrically and mechanically connected. When the temperature detection probe is connected to the connector, the voltage dividing resistor is electrically connected in series with the thermistor so as to be located above the thermistor, between a power source and a circuit ground. The temperature calculation unit calculates the temperature of a detection object in contact with the temperature detection probe based on the voltage between the connection point of the voltage dividing resistor and the thermistor and the circuit ground.

[0007] The probe-equipped oven according to the present invention comprises an oven and a temperature detection probe, the temperature detection probe being electrically and mechanically connectable to the connector of the oven.

[0008] A cooking system according to the present invention includes an oven and a range. The range communicates with the oven via wire. A first circuit ground of the oven is electrically connected to a second circuit ground of the range. The second circuit ground is electrically connected to earth. [Effects of the Invention]

[0009] According to the present invention, it is possible to achieve both noise countermeasures and accurate measurement of the temperature of the object to be cooked. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing a cooking system according to an embodiment of the present invention; [Figure 2] FIG. 1 is a functional block diagram of a cooking system according to an embodiment of the present invention. [Figure 3] FIG. 2 is an enlarged view of a portion of the cooking chamber of the oven. [Figure 4] FIG. 2 is a diagram showing a meat probe used in the cooking system according to the present embodiment. [Figure 5]2 is a diagram showing the circuit configuration of a temperature detection circuit that detects the temperature of an object to be cooked in the cooking system according to the present embodiment. FIG. [Figure 6] FIG. 10 is a diagram illustrating a comparative example for the temperature detection circuit of the cooking system according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0012] A cooking system 1 according to this embodiment will be described with reference to Figures 1 and 2. Figure 1 is a diagram showing the cooking system 1 according to this embodiment. Figure 2 is a functional block diagram of the cooking system 1 according to this embodiment.

[0013] The cooking system 1 includes an oven 10 and a microwave oven 20. The microwave oven 20 is an example of a range. In this embodiment, the side of the oven 10 on which an opening / closing door 11D (described later) is located is defined as the front side of the oven 10 (cooking system 1), and the side opposite the front side (the rear side) is defined as the rear side of the oven 10 (cooking system 1). Furthermore, the right side of the oven 10 (cooking system 1) when viewed from the front side is defined as the right side of the oven 10 (cooking system 1), and the side opposite the right side is defined as the left side of the oven 10 (cooking system 1). Furthermore, in a direction perpendicular to the front-to-rear and left-to-right directions of the oven 10 (cooking system 1), the side on which a display unit 14 and an operating unit 15 (described later) are located is defined as the top side of the oven 10 (cooking system 1), and the side opposite the top side (the bottom side) is defined as the bottom side of the oven 10 (cooking system 1). These orientations do not limit the orientation of the oven 10 (cooking system 1) of the present invention during use.

[0014] In this embodiment, the oven 10 and the microwave oven 20 are arranged side by side in the vertical direction. Specifically, the oven 10 is arranged above the microwave oven 20.

[0015] [Oven 10] Oven 10 includes cooking chamber 11, openable / closable door 11D, heating section 12, control section 13, display section 14, operation section 15, and housing 16.

[0016] As shown in FIG. 1, housing 16 has, for example, a generally rectangular parallelepiped shape with an open front. Cooking chamber 11 is provided inside housing 16. An object to be cooked (not shown) is placed in cooking chamber 11. Typically, housing 16 is formed of a metal chassis. For example, cooking chamber 11 and housing 16 are formed integrally. Cooking chamber 11 is formed inside housing 16 and is made of a heat-resistant material (such as enamel).

[0017] The door 11D is a vertical-opening door. Specifically, the lower front edge of the housing 16 is set as a horizontal axis, and the door 11D is attached to the housing 16 so as to be rotatable around this horizontal axis. However, the door 11D of this embodiment is not limited to a vertical-opening door. For example, the door 11D may be a horizontal-opening door that is rotatable around the vertical axis, with the left side edge of the housing 16 set as a vertical axis.

[0018] The heating unit 12 heats the food item placed in the cooking chamber 11. As an example, the heating unit 12 includes a grill heater (not shown) and a blower fan (not shown). Typically, the grill heaters are located above and below the cooking chamber 11. Specifically, the grill heaters are attached to the ceiling and bottom (floor) of the cooking chamber 11, respectively. The blower fan is located on the wall at the rear of the cooking chamber 11. The grill heater and the blower fan perform convection cooking on the food item. The grill heater grills or oven cooks the food item.

[0019] The display unit 14 is disposed on the front side of the housing 16, above the opening and closing door 11D. The display unit 14 is a liquid crystal display, an organic EL display, or the like, that has the function of displaying a screen related to the preparation of the cooking target. The operation unit 15 accepts user operations. The display unit 14 and the operation unit 15 are typically formed integrally as a touch panel display. For example, the operation unit 15 is a touch sensor provided on the touch panel display. The touch sensor is, for example, a capacitance-type touch sensor. The touch sensor accepts touch operations, slide operations, or the like by the user. When the touch sensor detects a touch operation or slide operation, it outputs a signal indicating the detection result to the control unit 13. Note that the operation unit 15 may be a touch sensor provided on the touch panel display, or may be a physical button or a pressure-sensitive touch panel switch provided separately from the display unit 14.

[0020] The control unit 13 controls the heating unit 12, the display unit 14, and the operation unit 15. Specifically, the control unit 13 includes a processor such as a CPU (Central Processing Unit) or an MCU (Micro Controller Unit). The control unit 13 is mounted on a control board 13B. The control board 13B is a multilayer board in which multiple conductive layers and multiple insulating layers are alternately stacked. One or more of the multiple conductive layers form a reference potential layer (signal ground SG1). The signal ground SG1 is an example of a first circuit ground.

[0021] In addition to the control unit 13, a power supply circuit or various circuit elements (not shown) are arranged on the control board 13B. For example, a memory unit 13M is arranged on the control board 13B. The memory unit 13M stores various programs, data, and the like. Specifically, the memory unit 13M includes semiconductor memory such as a read-only memory (ROM) and a random access memory (RAM), a solid-state drive (SSD), or a hard disk drive (HDD). The control unit 13 controls the heating unit 12 and the display of the display unit 14 by reading and executing various programs from the memory unit 13M. Note that the memory unit 13M may be provided on the control board 13B separately from the control unit 13, or may be provided in the control unit 13. Specifically, the memory unit 13M may be formed as a memory area included in the control unit 13.

[0022] In this embodiment, the signal ground SG1 of the control board 13B is electrically connected to the housing 16, which is made of a conductive metal. In other words, the housing 16 forms the frame ground FG1. That is, the housing 16 and the signal ground SG1 of the control board 13B are at the same potential. This makes it possible to suppress the occurrence of noise and errors due to disturbance noise.

[0023] [Microwave 20] The microwave oven 20 includes a cooking chamber 21, a microwave supply unit 22, a control unit 23, a drawer body 24, and a housing 26.

[0024] Housing 26 has, for example, a generally rectangular parallelepiped shape with an open front. Cooking chamber 21 is provided inside housing 26. Cooking chamber 21 has a predetermined volume as a space capable of accommodating an object to be cooked (not shown). Typically, housing 26 is formed of a metal chassis.

[0025] The drawer body 24 can be drawn out in the front-to-rear direction relative to the cooking chamber 21. In this embodiment, a drive mechanism such as a motor for driving the drawer body 24 is housed in the space between the bottom wall of the housing 26 and the bottom wall of the cooking chamber 21. The drive mechanism switches between a drawn-out state in which the drawer body 24 is drawn out from the cooking chamber 21 and a retracted state in which the drawer body 24 is retracted into the cooking chamber 21 under the control of the control unit 23 (described below). A door is provided in front of the drawer body 24, which can open and close the front opening of the cooking chamber 21. In the drawn-out state, the door opens the front opening of the cooking chamber 21, and in the retracted state, the door closes the front opening of the cooking chamber 21.

[0026] Microwave supply unit 22 has a magnetron. The magnetron supplies microwaves to cooking chamber 21 to heat an object to be cooked placed in cooking chamber 21.

[0027] The control unit 23 controls the microwave supply unit 22 and the drawer body 24. Specifically, the control unit 23 includes a processor such as a CPU (Central Processing Unit) or an MCU (Micro Controller Unit). The control unit 23 is mounted on a control board 23B. The control board 23B is a multilayer board in which multiple conductive layers and multiple insulating layers are alternately stacked. One or more of the multiple conductive layers form a reference potential layer (signal ground SG2). The signal ground SG2 is an example of a second circuit ground.

[0028] In addition to the control unit 23, a power supply circuit or various circuit elements (not shown) are arranged on the control board 23B. For example, a memory unit 23M is arranged on the control board 23B. The memory unit 23M stores various programs, data, and the like. Specifically, the memory unit 23M includes semiconductor memory such as a read-only memory (ROM) and a random access memory (RAM), a solid-state drive (SSD), or a hard disk drive (HDD). The control unit 23 reads and executes various programs from the memory unit 23M to control the microwave supply unit 22 and the drive mechanism that drives the drawer body 24. The memory unit 23M may be provided on the control board 23B separately from the control unit 23, or may be provided in the control unit 23. Specifically, the memory unit 23M may be formed as a memory area included in the control unit 23.

[0029] In this embodiment, the signal ground SG2 of the control board 23B is electrically connected to the conductive metal housing 26. In other words, the housing 26 forms the frame ground FG2. That is, the housing 26 and the signal ground SG2 of the control board 23B are at the same potential.

[0030] In cooking system 1, control unit 13 of oven 10 and control unit 23 of microwave oven 20 can communicate with each other. For example, control units 13 and 23 are electrically and mechanically connected to each other via a communication harness. This electrically connects signal ground SG1 of control board 13B and signal ground SG2 of control board 23B, making them at the same potential, enabling transmission and reception of signals via the communication harness. As a result, control unit 13 can control control unit 23, and can control microwave supply unit 22 and drawer body 24 via control unit 23. Control unit 23 can also control control unit 13, and can control heating unit 12, display unit 14, and operation unit 15 via control unit 13. In other words, microwave oven 20 communicates with oven 10 via a wired connection. Note that oven 10 and microwave oven 20 may communicate with each other via a wired connection via a communication harness, or may communicate with each other via wireless communication, for example.

[0031] In cooking system 1, housing 16 of oven 10 and housing 26 of microwave oven 20 are mechanically connected to each other by a connecting member P1 made of a conductive metal. Specifically, connecting member P1 is attached to the lower right side of housing 16 and the upper right side of housing 26, as well as to the lower left side of housing 16 and the upper left side of housing 26 (not shown in FIG. 1).

[0032] This also electrically connects housing 16 and housing 26. In other words, frame ground FG1 of oven 10 and frame ground FG2 of housing 26 are electrically connected to each other, and frame ground FG1 and frame ground FG2 have the same potential. As a result, signal ground SG1, which is electrically connected to frame ground FG1, and signal ground SG2, which is electrically connected to frame ground FG2, have the same potential.

[0033] Typically, microwave oven 20 is grounded. Specifically, frame ground FG2 of microwave oven 20 is grounded to reference potential GND (earth) via a power cable (not shown) or the like. In other words, frame ground FG2 is electrically connected to reference potential GND (earth). As a result, frame ground FG2 and frame ground FG1, signal ground SG1, and signal ground SG2 electrically connected to frame ground FG2 are at the same potential as reference potential GND.

[0034] Next, the meat probe 30 used in the cooking system 1 according to this embodiment will be described with reference to Figures 2 to 4. Figure 3 is an enlarged view of a portion of the cooking chamber 11 of the oven 10. Figure 3 is an enlarged view of area III indicated by a dashed line in Figure 1. Figure 4 is a diagram showing the meat probe 30 used in the cooking system 1 according to this embodiment.

[0035] As shown in Figures 2 and 3, the cooking system 1 further includes a meat probe 30. Specifically, the meat probe 30 is used together with the oven 10. In other words, the oven 10 and the meat probe 30 constitute a probe-equipped oven. The meat probe 30 is electrically and mechanically connected to the oven 10. The meat probe 30 also comes into contact with the food item placed in the cooking chamber 11. The food item is an example of a detection object. The meat probe 30 is used to detect the temperature of the food item placed in the cooking chamber 11. The meat probe 30 is an example of a temperature detection probe. The process of detecting the temperature of the food item using the meat probe 30 will be described later with reference to Figure 4.

[0036] As shown in FIG. 4, the meat probe 30 has a plug 31, a needle reader 32, and a cable portion 33. The plug 31 is electrically and mechanically connected to the oven 10. The needle reader 32 comes into contact with the food to be cooked. The cable portion 33 connects the plug 31 and the needle reader 32. The needle reader 32 is made of metal and has a needle-like shape.

[0037] Meanwhile, as shown in FIG. 2 , a socket 30C to which the meat probe 30 can be electrically and mechanically connected is provided in the cooking chamber 11 of the housing 16 of the oven 10. As an example, the socket 30C is provided on the left wall of the cooking chamber 11. The plug 31 of the meat probe 30 is inserted into the socket 30C. When the plug 31 is inserted into the socket 30C, the socket 30C and the meat probe 30 are electrically and mechanically connected. The socket 30C is an example of a connector. The relationship between the plug 31 and the socket 30C may be reversed. That is, the plug 31 may be provided in the cooking chamber 11, and the meat probe 30 may have the socket 30C. Furthermore, the position at which the socket 30C is provided in the cooking chamber 11 is not particularly limited. The socket 30C may be provided on the right wall, rear wall, ceiling, or floor of the cooking chamber 11.

[0038] Next, the process of detecting the temperature of the cooking object will be described with reference to Fig. 3 to Fig. 6. Fig. 5 is a diagram showing the circuit configuration of a temperature detection circuit that detects the temperature of the cooking object in the cooking system 1 according to this embodiment. Fig. 6 is a diagram showing a comparative example to the temperature detection circuit of the cooking system 1 according to this embodiment.

[0039] [Detection process in cooking system 1] As shown in FIGS. 4 and 5, the meat probe 30 includes a needle detector 32 and a thermistor TH. Specifically, the thermistor TH is disposed inside the needle detector 32. The thermistor TH has an electrical resistance Rth [Ω] that changes depending on the temperature. The thermistor TH is electrically connected to the plug 31 via a cable portion 33. The plug 31 has a first terminal 31p and a second terminal 31n. For example, the plug 31 has a rod-like shape. In the plug 31, the first terminal 31p and the second terminal 31n are arranged side by side in the axial direction. The first terminal 31p and the second terminal 31n are insulated from each other. In this embodiment, the second terminal 31n is located closer to the tip of the plug 31 than the first terminal 31p, but the positions of the first terminal 31p and the second terminal 31n may be reversed.

[0040] One end th1 of the thermistor TH is electrically connected to the first terminal 31p. The other end th2 of the thermistor TH, opposite to the one end th1, is electrically connected to the second terminal 31n. The other end th2 of the thermistor TH is also electrically connected to the needle reader 32. This makes it easier for heat from the cooking object to be transferred to the thermistor TH through the metal needle reader 32, which has excellent thermal conductivity, and the electrical resistance Rth [Ω] of the thermistor TH more easily reflects the temperature of the cooking object.

[0041] Meanwhile, in oven 10, socket 30C has a first terminal 30p that is electrically connected to first terminal 31p of plug 31 when plug 31 is inserted, and a second terminal 30n that is electrically connected to second terminal 31n of plug 31. First terminal 30p is an example of a first connecting portion. Second terminal 30n is an example of a second connecting portion.

[0042] The first terminal 30p of the socket 30C and the second terminal 30n of the socket 30C are electrically connected to the control unit 13 via pattern wiring on the control board 13B. The control unit 13 has a plurality of input / output terminals (hereinafter simply referred to as terminals). Of the plurality of terminals of the control unit 13, at least one is a reference terminal TV. Of the plurality of terminals of the control unit 13, at least one other is a ground terminal TG. Of the plurality of terminals of the control unit 13, at least one further is a voltage input terminal TI.

[0043] The reference terminal TV is electrically connected to a constant voltage power supply circuit (not shown). The constant voltage power supply circuit is a power supply arranged on the control board 13B, and generates a reference power supply potential Vdd relative to the signal ground SG1. The constant voltage power supply circuit is an example of a power supply. The ground terminal TG is electrically connected to the signal ground SG1. The voltage input terminal TI is electrically connected to the first terminal 30p of the socket 30C.

[0044] A pull-up resistor 41 (electrical resistance value R1 [Ω]) is connected between the voltage input terminal TI and the first terminal 30p of the socket 30C and the constant-voltage power supply circuit. Specifically, one end r1 of the pull-up resistor 41 is electrically connected to the voltage input terminal TI and the first terminal 30p of the socket 30C. The other end r2 of the pull-up resistor 41, opposite to the one end r1, is electrically connected to the constant-voltage power supply circuit.

[0045] In this embodiment, the second terminal 30n of the socket 30C is electrically connected to the signal ground SG1. As described above, the signal ground SG1 is grounded to the reference potential GND via the housing 16 of the oven 10 (frame ground FG1) and the housing 26 of the microwave oven 20 (frame ground FG2). Therefore, the second terminal 30n of the socket 30C is electrically connected to the reference potential GND at least via the housing 16. Furthermore, as shown in FIG. 3 , the socket 30C is provided on the wall surface of the cooking chamber 11 of the housing 16, and therefore the socket 30C and the cooking chamber 11 are electrically connected. Specifically, the second terminal 30n of the socket 30C and the cooking chamber 11 are electrically connected. Furthermore, the cooking chamber 11 is electrically connected to the housing 16. Therefore, an indefinite parasitic resistance component 42 (electrical resistance value R2 [Ω]) occurs between second terminal 30n of socket 30C and frame ground FG1 (reference potential GND) due to the contact resistance between socket 30C and cooking chamber 11 and the electrical resistance of cooking chamber 11. The electrical resistance value R2 of parasitic resistance component 42 fluctuates significantly, particularly depending on the installation state of socket 30C.

[0046] When the plug 31 is inserted into the socket 30C, the first terminal 30p of the socket 30C is electrically connected to one end th1 of the thermistor TH via the first terminal 31p of the plug 31. The second terminal 30n of the socket 30C is electrically connected to the other end th2 of the thermistor TH via the second terminal 31n of the plug 31.

[0047] Therefore, one end th1 of the thermistor TH is electrically connected to one end r1 of the pull-up resistor 41 and the voltage input terminal TI via the first terminal 31p of the plug 31 and the first terminal 30p of the socket 30C.

[0048] In this way, when the plug 31 is inserted into the socket 30C, a closed circuit is formed from the constant voltage power supply circuit through the pull-up resistor 41 and thermistor TH to the signal ground SG1. At this time, the reference power supply potential Vdd is divided by the pull-up resistor 41 and thermistor TH. In other words, the pull-up resistor 41 is a voltage-dividing resistor for the reference power supply potential Vdd. In this way, the pull-up resistor 41 is electrically connected in series with the thermistor TH so as to be located above the thermistor TH between the constant voltage power supply circuit and the signal ground SG1.

[0049] Specifically, when the plug 31 is inserted into the socket 30C, a predetermined voltage (potential difference) is applied to the voltage input terminal TI with respect to the signal ground SG1 based on the reference power supply potential Vdd, the electrical resistance value R1 of the pull-up resistor 41, and the electrical resistance value Rth of the thermistor TH. In other words, a predetermined voltage (potential difference) is generated between the connection point of one end r1 of the pull-up resistor 41 and one end th1 of the thermistor TH and the signal ground SG1.

[0050] The control unit 13 calculates the temperature of the object to be cooked that the meat probe 30 is in contact with based on the voltage (potential difference) applied to the voltage input terminal TI. The control unit 13 is an example of a temperature calculation unit. The control unit 13 functions as a temperature calculation unit by reading and executing various programs from the storage unit 13M. The control unit 13 performs A / D conversion of the voltage (potential difference) applied to the voltage input terminal TI into a digital value based on, for example, the reference power supply potential Vdd and the signal ground SG1. In this embodiment, temperature-voltage correspondence information indicating the correspondence relationship between the digital value indicating the voltage (potential difference) applied to the voltage input terminal TI and the temperature of the object to be cooked is stored in advance in the storage unit 13M. The control unit 13 references the temperature-voltage correspondence information in the storage unit 13M and acquires the temperature corresponding to the digital value indicating the voltage (potential difference) applied to the voltage input terminal TI.

[0051] [Comparative example of a temperature detection circuit] 6, the comparative example to the temperature detection circuit of the cooking system 1 is the same as the temperature detection circuit of the cooking system 1 except for the closed circuit that is formed compared to the temperature detection circuit of the cooking system 1. In other words, the temperature detection circuit of the cooking system 1 and the comparative example differ in the connection relationship of each circuit element.

[0052] Specifically, the constant voltage power supply circuit and the first terminal 30p of the socket 30C are electrically connected directly without a pull-up resistor 41. Meanwhile, the second terminal 30n of the socket 30C is electrically connected to the signal ground SG1 via a pull-down resistor 43 (electrical resistance R1 [Ω]). Specifically, one end r1 of the pull-down resistor 43 is electrically connected to the voltage input terminal TI and the second terminal 30n of the socket 30C. The other end r2 of the pull-down resistor 43 is electrically connected to the signal ground SG1. The connection relationships of the other circuit elements are the same as those of the temperature detection circuit in the cooking system 1 shown in FIG. 5.

[0053] In this comparative example for the temperature detection circuit of the cooking system 1, the other end th2 of the thermistor TH is electrically connected to signal ground SG1 via the second terminal 30n of the socket 30C and a pull-down resistor 43. The signal ground SG1 is electrically connected to the reference potential GND. Similar to the temperature detection circuit in the cooking system 1 shown in FIG. 5, an indefinite parasitic resistance component 42 (electrical resistance value R2 [Ω]) is generated between the second terminal 30n (voltage input terminal TI) of the socket 30C and the signal ground SG1 (reference potential GND). As a result, a combined resistance component 44 (electrical resistance value R0 [Ω]) consisting of the pull-down resistor 43 (electrical resistance value R1 [Ω]) and the parasitic resistance component 42 (electrical resistance value R2 [Ω]) is generated between the voltage input terminal TI and the ground terminal TG (signal ground SG1). Therefore, in this comparative example for the temperature detection circuit of the cooking system 1, a closed circuit is formed from the constant-voltage power supply circuit to the signal ground SG1 via the thermistor TH and the combined resistance component 44. As a result, a voltage (potential difference) is applied to the voltage input terminal TI relative to the signal ground SG1 based on the reference power supply potential Vdd, the electrical resistance value Rth of the thermistor TH, and the electrical resistance value R0 of the combined resistance component 44. The processing of the control unit 13 in the comparative example is the same as the processing of the control unit 13 in the cooking system 1, and therefore a description thereof will be omitted.

[0054] As described above, in the comparative example of the temperature detection circuit of cooking system 1, the temperature of the object to be detected is calculated using combined resistance component 44 of pull-down resistor 43 and parasitic resistance component 42. As described above, the electrical resistance value R2 [Ω] of parasitic resistance component 42 is indefinite depending on the installation state of socket 30C, etc. Therefore, in the comparative example of the temperature detection circuit, even if the temperature of the object to be cooked is a predetermined value, the temperature calculation result will fluctuate due to fluctuations in electrical resistance value R2 of parasitic resistance component 42.

[0055] Meanwhile, as shown in FIG. 5, in the temperature detection circuit of the cooking system 1, the other end th2 of the thermistor TH is electrically connected to the signal ground SG1 via the second terminal 30n of the socket 30C. Therefore, both ends of the parasitic resistance component 42 between the second terminal 30n of the socket 30C and the reference potential GND are electrically shorted. As a result, the electrical resistance value R2 [Ω] of the parasitic resistance component 42 is not used to calculate the temperature of the object to be detected, and the temperature calculation result is not affected by fluctuations in the electrical resistance value R2 of the parasitic resistance component 42. Therefore, the accuracy of the temperature calculation is improved compared to the comparative example of the temperature detection circuit shown in FIG. 6. Furthermore, since the signal ground SG1 and the reference potential GND are electrically connected in the oven 10, noise generation and errors due to external noise can be suppressed. Therefore, the oven 10 of this embodiment can achieve both noise countermeasures and accurate temperature measurement of the object to be cooked.

[0056] 5, when the meat probe 30 is connected to the socket 30C, the needle reader 32 is electrically connected to the signal ground SG1. This makes it possible to prevent a short circuit in the constant voltage power supply circuit even if the needle reader 32 of the meat probe 30 comes into contact with the housing 16 (frame ground FG1) or the like.

[0057] In this embodiment, the cooking system 1 includes an oven 10 and a microwave oven 20, and the signal ground SG1 of the oven 10 and the signal ground SG2 of the microwave oven 20 are grounded to the reference potential GND via the housings of the oven 10 and the microwave oven 20, but the cooking system 1 may also include only the oven 10, and the signal ground SG1 of the oven 10 may be grounded to the reference potential GND via the housing 16 of the oven 10.

[0058] In this embodiment, the signal ground SG1 and the frame ground FG1 are electrically connected in the oven 10 alone, but this is not limited to this. The signal ground SG1 and the frame ground FG1 may be electrically insulated in the oven 10 alone. In this case, the oven 10 and the microwave oven 20 are connected by a communication harness, so that the signal ground SG1 of the oven 10 is electrically connected to the signal ground SG2 of the microwave oven 20. The signal ground SG2 of the microwave oven 20 is electrically connected to the frame ground FG2. The frame ground FG2 of the microwave oven 20 is also electrically connected to the reference potential GND (earth) and the frame ground FG1 of the oven 10. Therefore, the signal ground SG1 of the oven 10 is electrically connected to the frame ground FG1 and the reference potential GND (earth) via the communication harness and the microwave oven 20.

[0059] The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiments and can be implemented in various forms without departing from the spirit of the present invention. Furthermore, the components disclosed in the above embodiments can be modified as appropriate. For example, some of the components shown in one embodiment may be added to the components of another embodiment, or some of the components shown in one embodiment may be deleted from the embodiment.

[0060] Furthermore, the drawings mainly show each component in a schematic manner to facilitate understanding of the invention, and the thickness, length, number, spacing, etc. of each component shown in the drawings may differ from the actual ones due to the convenience of creating the drawings. Furthermore, the configuration of each component shown in the above embodiment is merely an example and is not particularly limited, and it goes without saying that various modifications are possible within a range that does not substantially deviate from the effects of the present invention. [Industrial Applicability]

[0061] The present invention can be used in the field of cooking appliances. [Explanation of symbols]

[0062] 1: Cooking system 10: Oven 12: Heating section 13: Control unit (temperature calculation unit) 16: Housing 20: Microwave 30: Meat probe 30C: Socket (connector) 30n: 2nd terminal 30p: 1st terminal 31n: 2nd terminal 31p: 1st terminal 32: Meter reading body 41: Pull-up resistor (voltage dividing resistor) 42: Parasitic resistance component 43: Pull-down resistor GND: Reference potential (earth) R1: Electrical resistance value Rth: Electrical resistance SG1: Signal ground (first circuit ground) SG2: Signal ground (second circuit ground) TH: Thermistor Vdd: Reference power supply potential r1: one end r2: other end th1: one end th2: other end

Claims

1. a housing provided with a connector to which a temperature detection probe including a thermistor can be electrically and mechanically connected; a voltage dividing resistor that is electrically connected in series with the thermistor so as to be an upper stage of the thermistor between a power source and a circuit ground when the temperature detection probe is connected to the connector; a temperature calculation unit that calculates the temperature of the object to be detected that is in contact with the temperature detection probe based on a voltage between the connection point of the voltage dividing resistor and the thermistor and the circuit ground; Equipped with an oven.

2. The oven of claim 1 , wherein the circuit ground is electrically connected to earth.

3. The connector comprises: a first connection portion electrically connected to the voltage dividing resistor; a second connection portion electrically connected to the circuit ground and electrically connected to earth via the housing; and When the temperature detection probe is connected to the connector, the first connection portion is electrically connected to one end of the thermistor; The oven of claim 1 , wherein the second connection portion is electrically connected to the other end of the thermistor.

4. The temperature detection probe has a needle element made of metal, The oven according to claim 3 , wherein the needle reader is electrically connected to the other end of the thermistor.

5. an oven according to claim 1; a temperature sensing probe electrically and mechanically connectable to the connector of the oven; A probe oven comprising:

6. an oven according to claim 1; a microwave oven that communicates with the oven via wire; Equipped with the first circuit ground of the oven is electrically connected to the second circuit ground of the range; The second circuit ground is electrically connected to earth.

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