CN113747620B - Control circuit and control method of cooking appliance, cooking appliance and storage medium - Google Patents
Control circuit and control method of cooking appliance, cooking appliance and storage medium Download PDFInfo
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- CN113747620B CN113747620B CN202010473754.4A CN202010473754A CN113747620B CN 113747620 B CN113747620 B CN 113747620B CN 202010473754 A CN202010473754 A CN 202010473754A CN 113747620 B CN113747620 B CN 113747620B
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- 238000010411 cooking Methods 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 120
- 238000004590 computer program Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 29
- 230000008859 change Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000006112 glass ceramic composition Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/129—Cooking devices induction ovens
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- Induction Heating Cooking Devices (AREA)
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Abstract
The invention provides a control circuit and a control method of a cooking appliance, the cooking appliance and a storage medium. Wherein, cooking utensil's control circuit includes: a resistive element, a first end of the resistive element being adapted to be coupled to a power source; the negative electrode of the diode is connected with the second end of the resistive element, and the positive electrode of the diode is connected with the grounding end; and the controller is connected with the anode of the diode and the cathode of the diode, and is used for determining the first voltage drop of the diode and controlling the operation of the heating device according to the first voltage drop. The method has the advantages that whether the cooking utensil is in a dry burning state or not is judged through the change of the voltage drop of the reverse diode, the cooking utensil is controlled according to the judgment result, the problem that the temperature of the cooking utensil is too high is avoided, and compared with the control of the cooking utensil according to the thermistor detection temperature in the related art, the method has the advantages that the detection control speed is high, and the production cost of the cooking utensil is low.
Description
Technical Field
The invention belongs to the technical field of cooking appliances, and particularly relates to a control circuit and a control method of a cooking appliance, the cooking appliance and a computer readable storage medium.
Background
The conventional induction cooker adopts a non-contact temperature measurement mode, and the temperature of the cooker is indirectly measured through a thermosensitive assembly below the cooker panel. The oven panel is a glass ceramic material with a thickness of 4 mm, and the heat conductivity is not ideal. So that the temperature measurement of the cooker is inaccurate. In the cooking process, the dry heating of the cookware cannot be judged in time, so that potential safety hazards are easily caused.
Disclosure of Invention
The present invention aims to solve one of the technical problems existing in the prior art or related technologies.
To this end, a first aspect of the present invention proposes a control circuit of a wire cooking appliance.
A second aspect of the invention proposes a control method.
A third aspect of the present invention provides a cooking appliance.
A fourth aspect of the present invention proposes a computer-readable storage medium.
In view of this, according to a first aspect of the present invention, there is provided a control circuit of a cooking appliance including a heating device, the control circuit including: a resistive element, a first end of the resistive element being adapted to be coupled to a power source; the negative electrode of the diode is connected with the second end of the resistive element, and the positive electrode of the diode is connected with the grounding end; and the controller is connected with the anode of the diode and the cathode of the diode, and is used for determining the first voltage drop of the diode and controlling the operation of the heating device according to the first voltage drop.
The control circuit of the cooking utensil comprises a resistive element, a diode and a controller, wherein one end of the resistive element is connected with a power supply, the other end of the resistive element is connected with the cathode of the diode, the resistive element plays a role in voltage division, the anode of the diode is connected with a grounding end, and current flows in from the cathode of the diode after flowing through the resistive element from the power supply and flows out from the anode of the diode. The diode is provided as a temperature sensing element within the cooking appliance, it being understood that the diode does not turn off perfectly when it is turned off in reverse. When subjected to reverse voltage, some minor current will leak from the cathode to the anode of the diode. This current is typically small and the higher the ambient temperature at which the diode is located, the greater the leakage current, and the ambient temperature at which the diode is located can be detected by detecting the voltage drop at the diode.
The controller is connected with the anode of the diode and the cathode of the diode, can collect the first voltage drop of the diode, and controls the heating device in the cooking utensil according to the collected first voltage drop of the diode. The first voltage drop at the diode can reflect the magnitude of the leakage current of the diode, thereby determining the temperature of the environment in which the diode is located. The temperature detection is carried out on the cooking utensil through the diode, the heating device in the cooking utensil is controlled according to the temperature of the cooking utensil detected by the diode, the dry burning phenomenon in the cooking utensil is avoided, compared with the prior art, the temperature detection is carried out on the cooking utensil by utilizing the thermistor, the detection device is free from being attached to a to-be-detected piece, the detection speed is high, the safety performance is improved, and the cost is low.
In addition, the control circuit of the cooking utensil in the technical scheme provided by the invention can also have the following additional technical characteristics:
In the above technical solution, before the step of controlling the operation of the heating device according to the first pressure drop, the controller further includes: and determining the working condition temperature of the heating device as the set temperature, and obtaining the second voltage drop of the diode.
In the technical scheme, the controller determines the working condition temperature of the heating device to be a set temperature according to the step of controlling the working of the heating device by the first voltage drop of the diode, acquires the second voltage drop of the diode, wherein the set temperature is selected as the normal temperature of the heating device in a cooking utensil in a non-working state, acquires the second voltage drop of the diode of the heating device in the normal temperature state, and takes the second voltage drop as the initial voltage drop of the diode.
In any of the above embodiments, the step of controlling, by the controller, the operation of the heating device according to the first pressure drop specifically includes: calculating an absolute value of a difference between the first pressure drop and the second pressure drop; controlling the heating device to continue to work based on the absolute value of the difference value being smaller than or equal to a first set value; and controlling the heating device to stop working based on the absolute value of the difference value being larger than the first set value.
In the technical scheme, the absolute value of the difference value between the first pressure drop and the second pressure drop is calculated, the magnitude of the absolute value can reflect the temperature of the environment where the diode is located, if the absolute value of the difference value is smaller than or equal to a first set value, the temperature detected by the diode is judged not to reach the set temperature, the heating device is controlled to continue to work, if the absolute value of the difference value is larger than the first set value, the cooking appliance is judged to be in a dry burning state, the heating device is controlled to stop working, the dry burning damage of the cooking device is prevented, whether the cooking appliance is in the dry burning state is judged through the change of the pressure drop at the position where the diode is reversely connected, the cooking appliance is controlled according to the judging result, the problem that the temperature of the cooking appliance is too high is avoided is solved, and compared with the related art, the method for controlling the cooking appliance according to the temperature detected by the thermistor, the method for detecting and the control speed is higher, and the production cost of the cooking appliance is lower.
In any of the above embodiments, the step of controlling, by the controller, the operation of the heating device according to the first pressure drop specifically includes: controlling the heating device to continue to operate based on the first pressure drop having a value less than or equal to the second set value; and controlling the heating device to stop working based on the fact that the value of the first pressure drop is larger than the second set value.
In the technical scheme, in the operation process of the cooking utensil, the detected value of the first pressure drop is smaller than or equal to the second set value, the fact that the temperature detected by the diode does not reach the set temperature is judged, the heating device is controlled to work continuously, the absolute value of the difference value is larger than the first set value, the cooking utensil is judged to be in a dry-burning state, the heating device is controlled to stop working, the cooking device is prevented from being damaged in dry-burning, whether the cooking utensil is in the dry-burning state or not is judged through the change of the pressure drop at the position of the reverse diode, the cooking utensil is controlled according to the judgment result, the problem that the temperature of the cooking utensil is too high is avoided, and compared with the fact that the cooking utensil is controlled according to the temperature detected by the thermistor in the related art, the detection control speed is higher, and the production cost of the cooking utensil is lower.
In any of the above solutions, the control circuit further includes: and the first end of the capacitive element is connected with the cathode of the diode, the second end of the capacitive element is connected with the anode of the diode, and the second end of the capacitive element is connected with the controller.
In the technical scheme, the temperature detection circuit further comprises a capacitive element, the first end of the capacitive element is connected with the cathode of the diode, the second end of the capacitive element is connected with the anode of the diode, the second end of the capacitive element is connected with the control, the capacitive element can filter a signal with voltage drop, acquired by the controller from the diode, acquired by the controller, so that the first voltage drop or the second voltage drop is more accurate, and the control efficiency of the control circuit pair is further improved.
In any of the above embodiments, the diode is a photodiode.
According to a second aspect of the present invention, there is provided a control method for a control circuit of a cooking appliance according to any one of the above-mentioned aspects, the control method comprising: determining a first voltage drop of the diode; the operation of the heating means is controlled in dependence on the first pressure drop.
In this technical solution, the heating device in the cooking appliance is controlled according to the first voltage drop of the collected diode. The first voltage drop at the diode can reflect the magnitude of the leakage current of the diode, thereby determining the temperature of the environment in which the diode is located. The temperature detection is carried out on the cooking utensil through the diode, the heating device in the cooking utensil is controlled according to the temperature of the cooking utensil detected by the diode, compared with the detection of the temperature of the cooking utensil by utilizing the thermistor in the prior art, the detection device has the advantages that the detection device does not need to be attached to a piece to be detected, the detection speed is high, and the cost is lower.
It will be appreciated that the diode is not fully ideal for cut-off when reverse cut-off. When subjected to reverse voltage, some minor current will leak from the cathode to the anode of the diode. This current is typically small and the higher the ambient temperature at which the diode is located, the greater the leakage current, and the ambient temperature at which the diode is located can be detected by detecting the voltage drop at the diode.
In addition, according to the control method in the technical scheme provided by the invention, the control method also has the following additional technical characteristics:
in the above technical solution, before the step of controlling the operation of the heating device according to the first pressure drop, the method further includes: and determining the working condition temperature of the heating device to be a first set temperature, and obtaining the second voltage drop of the diode.
In the technical scheme, according to the step of controlling the operation of the heating device according to the first pressure drop of the diode, the working condition temperature of the heating device is determined to be a set temperature, the second pressure drop of the diode is obtained, the set temperature is selected as the normal temperature of the heating device in a cooking utensil in an unoperated state, the second pressure drop of the diode of the heating device in the normal temperature state is obtained, and the second pressure drop is used as the initial pressure drop of the diode.
In any of the above embodiments, the step of controlling the operation of the heating device according to the first pressure drop specifically includes: calculating an absolute value of a difference between the first pressure drop and the second pressure drop; controlling the heating device to continue to work based on the absolute value of the difference value being smaller than or equal to a first set value; and controlling the heating device to stop working based on the absolute value of the difference value being larger than the first set value.
In the technical scheme, the absolute value of the difference value between the first pressure drop and the second pressure drop is calculated, the magnitude of the absolute value can reflect the temperature of the environment where the diode is located, if the absolute value of the difference value is smaller than or equal to a first set value, the temperature detected by the diode is judged not to reach the set temperature, the heating device is controlled to continue to work, if the absolute value of the difference value is larger than the first set value, the cooking appliance is judged to be in a dry burning state, the heating device is controlled to stop working, the dry burning damage of the cooking device is prevented, whether the cooking appliance is in the dry burning state is judged through the change of the pressure drop at the position where the diode is reversely connected, the cooking appliance is controlled according to the judging result, the problem that the temperature of the cooking appliance is too high is avoided is solved, and compared with the related art, the method for controlling the cooking appliance according to the temperature detected by the thermistor, the method for detecting and the control speed is higher, and the production cost of the cooking appliance is lower.
In any of the above embodiments, the step of controlling the operation of the heating device according to the first pressure drop specifically includes: controlling the heating device to continue to operate based on the first pressure drop having a value less than or equal to the second set value; and controlling the heating device to stop working based on the fact that the value of the first pressure drop is larger than the second set value.
In the technical scheme, in the operation process of the cooking utensil, the detected value of the first pressure drop is smaller than or equal to the second set value, the fact that the temperature detected by the diode does not reach the set temperature is judged, the heating device is controlled to work continuously, the absolute value of the difference value is larger than the first set value, the cooking utensil is judged to be in a dry-burning state, the heating device is controlled to stop working, the cooking device is prevented from being damaged in dry-burning, whether the cooking utensil is in the dry-burning state or not is judged through the change of the pressure drop at the position of the reverse diode, the cooking utensil is controlled according to the judgment result, the problem that the temperature of the cooking utensil is too high is avoided, and compared with the fact that the cooking utensil is controlled according to the temperature detected by the thermistor in the related art, the detection control speed is higher, and the production cost of the cooking utensil is lower.
According to a third aspect of the present invention there is provided a cooking appliance comprising: a housing; the heating device is arranged in the shell; a panel disposed on the housing; the control circuit of a cooking appliance according to any one of the above embodiments, wherein the diode in the control circuit of the cooking appliance is spaced from the panel.
In this technical scheme, cooking utensil includes casing, heating device, panel and cooking utensil's among the above-mentioned any technical scheme control circuit, therefore has the beneficial technical effect of cooking utensil's among the above-mentioned any technical scheme control circuit, and the redundant description is not repeated here.
The diode in the control circuit is used as a temperature sensing element in the cooking utensil, the diode and the panel for heating of the cooking utensil are arranged at intervals, the diode and the heating panel are also arranged at intervals to sense the temperature of the heating panel, the diode and the heating panel are not required to be attached to each other, and the failure rate of the temperature sensing element in cooking is reduced.
According to a fourth aspect of the present invention a computer-readable storage medium is presented, on which a computer program is stored which, when executed by a processor, implements a control method as in any of the above-mentioned aspects. Therefore, the control method has all the beneficial technical effects of any one of the above technical schemes, and will not be described in detail herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 illustrates a circuit diagram of a control circuit of a cooking appliance according to an embodiment of the present invention;
Fig. 2 illustrates a circuit diagram of a control circuit of a cooking appliance according to another embodiment of the present invention;
FIG. 3 shows a flow diagram of a control method of one embodiment of the invention;
FIG. 4 is a flow chart of a control method according to another embodiment of the present invention;
FIG. 5 shows a flow chart of a control method according to still another embodiment of the present invention;
FIG. 6 is a flow chart of a control method according to an embodiment of the present invention;
FIG. 7 is a flow chart of a control method according to another embodiment of the present invention;
FIG. 8 is a logarithmic graph showing the temperature characteristics of leakage current of a diode according to the present invention;
Fig. 9 shows a graph of the leakage current temperature characteristic of the diode according to the present invention.
Wherein, the correspondence between the reference numerals and the component names in fig. 1 to 2 is:
100 resistive elements, 200 diodes, 300 capacitive elements, 400 controllers.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
A control circuit of a cooking appliance, a control method, a cooking appliance, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 9.
Embodiment one:
As shown in fig. 1, in one embodiment of the present invention, there is provided a control circuit of a cooking appliance including a heating device, the control circuit including: a resistive element 100, a first end of the resistive element 100 being adapted to be connected to a power source; the negative electrode of the diode 200 is connected with the second end of the resistive element 100, and the positive electrode of the diode 200 is connected with the ground terminal; and a controller 400, the controller 400 being connected to the anode of the diode 200 and the cathode of the diode 200, the controller 400 being configured to determine a first voltage drop of the diode 200, and to control the operation of the heating device according to the first voltage drop.
In this embodiment, the control circuit of the cooking appliance includes the resistive element 100, the diode 200 and the controller 400, one end of the resistive element 100 is connected to the power supply, the other end of the resistive element 100 is connected to the cathode of the diode 200, the resistive element 100 has a voltage dividing function, the anode of the diode 200 is connected to the ground, and the current flows from the power supply through the resistive element 100 and then flows from the cathode of the diode 200 to the anode of the diode 200. The diode 200 is provided as a temperature sensing element within the cooking appliance, and it is understood that the diode 200 is not completely ideally turned off when it is turned off in the reverse direction. When subjected to reverse voltage, some small current will leak from the cathode to the anode of diode 200. This current is typically small and the higher the ambient temperature at which the diode 200 is located, the greater the leakage current, and the ambient temperature at which the diode 200 is located can be detected by detecting the voltage drop at the diode 200.
The controller 400 is connected to the anode of the diode 200 and the cathode of the diode 200, and is capable of collecting a first voltage drop at the diode 200 and controlling the heating device in the cooking appliance according to the collected first voltage drop of the diode 200. The first voltage drop at the diode 200 can reflect the magnitude of the leakage current of the diode 200, thereby determining the temperature of the environment in which the diode 200 is located. The temperature of the cooking utensil is detected through the diode 200, the heating device in the cooking utensil is controlled according to the temperature of the cooking utensil detected by the diode 200, and compared with the temperature of the cooking utensil detected by using the thermistor in the prior art, the temperature detection device has the advantages that the temperature detection device does not need to be attached to a piece to be detected, the detection speed is high, and the cost is low.
Embodiment two:
As shown in fig. 2, in one embodiment of the present invention, there is provided a control circuit of a cooking appliance including a heating device, the control circuit including: a resistive element 100, a first end of the resistive element 100 being adapted to be connected to a power source; the negative electrode of the diode 200 is connected with the second end of the resistive element 100, and the positive electrode of the diode 200 is connected with the ground terminal; the first terminal of the capacitive element 300 is connected to the cathode of the diode 200, the second terminal of the capacitive element 300 is connected to the anode of the diode 200, and the second terminal of the capacitive element 300 is connected to the controller 400.
And a controller 400, the controller 400 being connected to the anode of the diode 200 and the cathode of the diode 200, the controller 400 being configured to determine a first voltage drop of the diode 200, and to control the operation of the heating device according to the first voltage drop.
In this technical solution, the temperature detection circuit further includes a capacitive element 300, a first end of the capacitive element 300 is connected to the cathode of the diode 200, a second end of the capacitive element 300 is connected to the anode of the diode 200, a second end of the capacitive element 300 is connected to the control, and the capacitive element 300 can filter the signal with voltage drop obtained by the controller 400 from the diode 200, so that the first voltage drop or the second voltage drop obtained by the controller 400 is more accurate, and the control efficiency of the control circuit pair is further improved.
In the above embodiment, before the step of controlling the operation of the heating device according to the first pressure drop, the controller 400 further includes: the operating temperature of the heating device is determined to be the set temperature and the second voltage of the diode 200 is obtained.
In this embodiment, the controller 400 determines the operating temperature of the heating device to be a set temperature according to the first voltage drop of the diode 200 in the step of controlling the operation of the heating device, obtains the second voltage drop of the diode 200, and obtains the second voltage drop of the diode in the normal temperature state of the heating device in the cooking appliance, wherein the set temperature is selected as the normal temperature in the non-operating state of the heating device, and takes the second voltage drop as the initial voltage drop of the diode 200.
In any of the above embodiments, the step of controlling the operation of the heating device by the controller 400 according to the first pressure drop specifically includes: calculating an absolute value of a difference between the first pressure drop and the second pressure drop; controlling the heating device to continue to work based on the absolute value of the difference value being smaller than or equal to a first set value; and controlling the heating device to stop working based on the absolute value of the difference value being larger than the first set value.
In this embodiment, the absolute value of the difference between the first pressure drop and the second pressure drop is calculated, the magnitude of the absolute value can reflect the temperature of the environment where the diode 200 is located, if the absolute value of the difference is smaller than or equal to the first set value, it is determined that the temperature detected by the diode 200 does not reach the set temperature, the heating device is controlled to continue to work, if the absolute value of the difference is larger than the first set value, it is determined that the cooking appliance is in a dry-burning state, the heating device is controlled to stop working, the dry-burning damage of the cooking appliance is prevented, the cooking appliance is controlled according to the determination result, the problem that the temperature of the cooking appliance is too high is avoided, compared with the related art that the cooking appliance is controlled according to the temperature detected by the thermistor, the detection control speed is higher, and the production cost of the cooking appliance is lower.
In any of the above embodiments, the step of controlling the operation of the heating device by the controller 400 according to the first pressure drop specifically includes: controlling the heating device to continue to operate based on the first pressure drop having a value less than or equal to the second set value; and controlling the heating device to stop working based on the fact that the value of the first pressure drop is larger than the second set value.
In this embodiment, during the operation of the cooking appliance, the detected value of the first pressure drop is smaller than or equal to the second set value, it is determined that the temperature detected by the diode 200 does not reach the set temperature, the heating device is controlled to continue to operate, the absolute value of the difference value is larger than the first set value, the cooking appliance is determined to be in a dry-burning state, the heating device is controlled to stop operating, the cooking device is prevented from being damaged by dry burning, whether the cooking appliance is in the dry-burning state is determined by the change of the pressure drop at the position of the reverse diode 200, the cooking appliance is controlled according to the determination result, the problem that the temperature of the cooking appliance is too high is avoided, and compared with the control of the cooking appliance according to the thermistor detection temperature in the related art, the detection control speed is higher, and the production cost of the cooking appliance is lower.
In any of the above embodiments, the diode 200 is a photodiode.
As shown in fig. 8 and 9, the dark current in the photodiode changes with a change in temperature, and the dark current refers to the current flowing in the photodiode in a state where no light is irradiated. The temperature rise causes electrons in the valence band to become more active and excited to the conduction band, with a significant increase in dark current as the temperature rises.
As shown in fig. 8, the leakage current value of the photodiode at different temperatures is 5v, the resistive element is 5.1kΩ, the higher the temperature, the higher the leakage current of the photodiode increases exponentially, and the corresponding relationship between the specific temperature and the leakage current is shown in table 1.
| Temperature (. Degree. C.) | Leakage current (uA) |
| 20 | 0.25 |
| 40 | 0.25 |
| 60 | 0.25 |
| 80 | 0.26 |
| 100 | 0.29 |
| 120 | 0.36 |
| 140 | 0.5 |
| 160 | 0.8 |
| 180 | 1.45 |
| 200 | 3.07 |
| 220 | 5.32 |
| 240 | 10.17 |
| 260 | 19.39 |
| 280 | 39.47 |
| 300 | 77.5 |
TABLE 1
Embodiment III:
as shown in fig. 3, in one embodiment of the present invention, there is provided a control method including:
step S302, determining a first voltage drop of a diode;
step S304, controlling the operation of the heating device according to the first pressure drop.
In this embodiment, the heating means in the cooking appliance is controlled according to the first voltage drop of the diode acquired. The first voltage drop at the diode can reflect the magnitude of the leakage current of the diode, thereby determining the temperature of the environment in which the diode is located. The temperature detection is carried out on the cooking utensil through the diode, the heating device in the cooking utensil is controlled according to the temperature of the cooking utensil detected by the diode, compared with the detection of the temperature of the cooking utensil by utilizing the thermistor in the prior art, the detection device has the advantages that the detection device does not need to be attached to a piece to be detected, the detection speed is high, and the cost is lower.
It will be appreciated that the diode is not fully ideal for cut-off when reverse cut-off. When subjected to reverse voltage, some minor current will leak from the cathode to the anode of the diode. This current is typically small and the higher the ambient temperature at which the diode is located, the greater the leakage current, and the ambient temperature at which the diode is located can be detected by detecting the voltage drop at the diode.
Embodiment four:
in another embodiment of the present invention, as shown in fig. 4, there is provided a control method including:
step S402, determining a first voltage drop of a diode;
step S404, determining the working condition temperature of the heating device as a first set temperature, and obtaining the second voltage drop of the diode;
In step S406, an absolute value of the difference between the first pressure drop and the second pressure drop is calculated, the heating device is controlled to continue to operate based on the absolute value of the difference being less than or equal to the first set value, and the heating device is controlled to stop operating based on the absolute value of the difference being greater than the first set value.
In this embodiment, according to the step of controlling the operation of the heating device by the first voltage drop of the diode, the operating condition temperature of the heating device is determined to be a set temperature, the second voltage drop of the diode is obtained, the set temperature is selected as the normal temperature in the non-operating state of the heating device in the cooking appliance, the second voltage drop of the diode in the normal temperature state of the heating device is obtained, and the second voltage drop is taken as the initial voltage drop of the diode. The absolute value of the difference value between the first voltage drop and the second voltage drop is calculated, the absolute value of the absolute value can reflect the temperature of the environment where the diode is located, if the absolute value of the difference value is smaller than or equal to a first set value, the temperature detected by the diode is judged not to reach the set temperature, the heating device is controlled to continue to work, if the absolute value of the difference value is larger than the first set value, the heating device is judged to be in a dry-heating state, the heating device is controlled to stop working, the dry-heating damage of the cooking device is prevented, whether the cooking device is in the dry-heating state is judged through the change of the voltage drop at the position of the reverse diode, the cooking device is controlled according to the judging result, the problem that the temperature of the cooking device is too high is avoided is solved, and compared with the related art, the method for controlling the cooking device according to the detection temperature of the thermistor, the detection control speed is higher, and the production cost of the cooking device is lower.
Fifth embodiment:
in still another embodiment of the present invention, as shown in fig. 5, there is provided a control method including:
step S502, determining a first voltage drop of a diode;
In step S504, the heating device is controlled to continue to operate based on the first pressure drop being less than or equal to the second set value, and the heating device is controlled to stop operating based on the first pressure drop being greater than the second set value.
In this embodiment, during the operation of the cooking appliance, the detected value of the first pressure drop is smaller than or equal to the second set value, it is determined that the temperature detected by the diode does not reach the set temperature, the heating device is controlled to continue to operate, the absolute value of the difference value is larger than the first set value, the cooking appliance is determined to be in a dry-burning state, the heating device is controlled to stop operating, the cooking device is prevented from being damaged by dry burning, whether the cooking appliance is in the dry-burning state is determined by the change of the pressure drop at the position of the reverse diode, the cooking appliance is controlled according to the determination result, the problem that the temperature of the cooking appliance is too high is avoided, and compared with the case that the cooking appliance is controlled according to the temperature detected by the thermistor in the related art, the detection control speed is higher, and the production cost of the cooking appliance is lower.
Example six:
as shown in fig. 6, in one embodiment of the present invention, there is provided a control method including:
step S602, determining a first voltage drop U0 of the diode;
Step S604, judging whether U0 is greater than A, if so, executing step S606, and if not, executing step S610;
Step S606, judging dry combustion;
step S608, stop heating
Step S610, heating is normal.
Wherein A is more than or equal to 0.01V and less than or equal to 2.5V.
In another embodiment of the present invention, as shown in fig. 7, there is provided a control method, including:
step S702, storing a second voltage drop U1 of the diode at normal temperature;
step S704, determining a first voltage drop U0 of the diode;
Step S706, judging whether (U1-U0) > B, if so, executing step S708, and if so, executing step S712;
Step S708, judging dry combustion;
Step S710, stop heating
Step S712, heating normally.
Wherein B is more than or equal to 0.05V and less than or equal to 5V.
In this embodiment, the voltage value across the diode is obtained by the controller. When the temperature is high, the diode leakage current increases, resulting in a decrease in the voltage of the diode. And determining whether the cookware is dry-burned or not by judging the voltage drop of the diode.
Specifically, the temperature of the pot is above 300 ℃ during dry heating. The power supply voltage is set to be 5V, the resistive element is 10KΩ, the leakage current is 0.25uA at the normal temperature of 25 ℃, the diode voltage drop is 4.9975V, the leakage current is 77.55uA at the high temperature of 300 ℃, and the diode voltage drop is 4.225V, so that the approximate temperature value can be easily obtained through the voltage value. When the photodiode is positioned around the pot, the dry-burning state is identified through the voltage drop of the diode.
Embodiment seven:
In one embodiment of the present invention, there is provided a cooking appliance including: a housing; the heating device is arranged in the shell; a panel disposed on the housing; the control circuit of a cooking appliance according to any one of the above embodiments, wherein the diode in the control circuit of the cooking appliance is spaced from the panel.
In this embodiment, the cooking appliance includes a housing, a heating device, a panel, and a control circuit of the cooking appliance according to any one of the above embodiments, so that the control circuit of the cooking appliance according to any one of the above embodiments has the beneficial technical effects and will not be described in detail herein.
The diode in the control circuit is used as a temperature sensing element in the cooking utensil, the diode and the panel for heating of the cooking utensil are arranged at intervals, the diode and the heating panel are also arranged at intervals to sense the temperature of the heating panel, the diode and the heating panel are not required to be attached to each other, and the failure rate of the temperature sensing element in cooking is reduced.
Example eight:
In one embodiment of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements a control method according to any of the above-mentioned aspects. Therefore, the control method in any of the above embodiments has all the beneficial technical effects, and will not be described in detail herein.
In the present invention, the term "plurality" means two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A control circuit of a cooking appliance, the cooking appliance comprising a heating device, the control circuit comprising:
a resistive element, a first end of the resistive element being adapted to be connected to a power source;
the cathode of the diode is connected with the second end of the resistive element, and the anode of the diode is connected with the grounding end;
The controller is connected with the anode of the diode and the cathode of the diode, and is used for determining the first voltage drop of the diode and controlling the operation of the heating device according to the first voltage drop;
the controller further includes, prior to the step of controlling operation of the heating device in accordance with the first pressure drop:
And determining the working condition temperature of the heating device as a set temperature, and obtaining the second voltage drop of the diode.
2. The control circuit of a cooking appliance according to claim 1, wherein the step of the controller controlling the operation of the heating device according to the first pressure drop comprises:
Calculating an absolute value of a difference between the first pressure drop and the second pressure drop;
Controlling the heating device to continue to work based on the absolute value of the difference value being smaller than or equal to a first set value;
And controlling the heating device to stop working based on the absolute value of the difference value being larger than a first set value.
3. The control circuit of a cooking appliance according to claim 1, wherein the step of the controller controlling the operation of the heating device according to the first pressure drop comprises:
Controlling the heating device to continue to operate based on the first pressure drop being less than or equal to a second set value;
and controlling the heating device to stop working based on the fact that the value of the first pressure drop is larger than a second set value.
4. A control circuit of a cooking appliance according to any one of claims 1 to 3, characterized in that the control circuit further comprises:
And the first end of the capacitive element is connected with the cathode of the diode, the second end of the capacitive element is connected with the anode of the diode, and the second end of the capacitive element is connected with the controller.
5. The control circuit of the cooking appliance according to claim 4, wherein,
The diode is a photodiode.
6. A control method for the control circuit of the cooking appliance according to any one of claims 1 to 5, characterized in that the control method comprises:
determining a first voltage drop of the diode;
controlling the operation of the heating device according to the first pressure drop;
Before the step of controlling the operation of the heating device according to the first pressure drop, the method further comprises:
and determining the working condition temperature of the heating device as a first set temperature, and obtaining the second voltage drop of the diode.
7. The control method according to claim 6, wherein the step of controlling the operation of the heating device according to the first pressure drop specifically comprises:
Calculating an absolute value of a difference between the first pressure drop and the second pressure drop;
Controlling the heating device to continue to work based on the absolute value of the difference value being smaller than or equal to a first set value;
And controlling the heating device to stop working based on the absolute value of the difference value being larger than a first set value.
8. The control method according to claim 6, wherein the step of controlling the operation of the heating device according to the first pressure drop specifically comprises:
Controlling the heating device to continue to operate based on the first pressure drop being less than or equal to a second set value;
and controlling the heating device to stop working based on the fact that the value of the first pressure drop is larger than a second set value.
9. A cooking appliance, comprising:
A housing;
A heating device disposed within the housing;
a panel disposed on the housing;
the control circuit of a cooking appliance according to any one of claims 1 to 5, wherein a diode in the control circuit of the cooking appliance is spaced apart from the panel.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the control method according to any one of claims 6 to 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1675820A (en) * | 2002-08-13 | 2005-09-28 | 三垦电气株式会社 | Overheat protection device |
| CN101690386A (en) * | 2007-06-21 | 2010-03-31 | 松下电器产业株式会社 | Induction heating cooker |
| WO2011155211A1 (en) * | 2010-06-09 | 2011-12-15 | パナソニック株式会社 | Induction heating cooker |
| CN110507183A (en) * | 2019-08-27 | 2019-11-29 | 九阳股份有限公司 | A kind of dry combustion method guard method, cooking apparatus and the storage medium of cooking apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5083283B2 (en) * | 2008-10-29 | 2012-11-28 | パナソニック株式会社 | Induction heating cooker |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1675820A (en) * | 2002-08-13 | 2005-09-28 | 三垦电气株式会社 | Overheat protection device |
| CN101690386A (en) * | 2007-06-21 | 2010-03-31 | 松下电器产业株式会社 | Induction heating cooker |
| WO2011155211A1 (en) * | 2010-06-09 | 2011-12-15 | パナソニック株式会社 | Induction heating cooker |
| CN110507183A (en) * | 2019-08-27 | 2019-11-29 | 九阳股份有限公司 | A kind of dry combustion method guard method, cooking apparatus and the storage medium of cooking apparatus |
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