阅读说明：本技术 烹饪器具的控制电路、控制方法、烹饪器具和存储介质 (Control circuit and control method of cooking appliance, cooking appliance and storage medium ) 是由 江德勇 郑量 黄庶锋 任祥喜 王云峰 于 2020-05-29 设计创作，主要内容包括：本发明提供了一种烹饪器具的控制电路、控制方法、烹饪器具和存储介质。其中,烹饪器具的控制电路包括：阻性元件,阻性元件的第一端用于与电源相连；二极管,二极管的负极与阻性元件的第二端相连,二极管的正极与接地端相连；控制器,控制器与二极管的正极和二极管的负极相连,控制器用于确定二极管的第一压降,根据第一压降控制加热装置的工作。实现了通过反接二极管处的压降的变化判断烹饪器具是否处于干烧状态,根据判断结果对烹饪器具进行控制,实现了避免烹饪器具温度过高的问题发生,相比于相关技术中根据热敏电阻检测温度对烹饪器具进行控制,具有检测控制速度较快,且烹饪器具生产成本较低。(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: the first end of the resistive element is used for being connected with a power supply; 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 ground terminal; and the controller is connected with the anode of the diode and the cathode of the diode and is used for determining a first voltage drop of the diode and controlling the operation of the heating device according to the first voltage drop. Whether the cooking utensil is in the dry-fire state is judged through the change of the voltage drop of the reverse diode department, whether the cooking utensil is controlled according to the judged result, the problem of avoiding the too high temperature of the cooking utensil is realized, the control of the cooking utensil according to the thermistor detection temperature in the correlation technique is compared, the detection control speed is fast, and the cooking utensil production cost is low.)

1. A control circuit for a cooking appliance, the cooking appliance comprising heating means, the control circuit comprising:

the first end of the resistive element is used for being connected with a power supply;

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 ground terminal;

the controller is connected with the anode of the diode and the cathode of the diode and used for determining a first voltage drop of the diode and controlling the heating device to work according to the first voltage drop.

2. The control circuit of claim 1, wherein the controller further comprises, prior to the step of controlling the operation of the heating device according to the first voltage drop:

and determining the working condition temperature of the heating device as a set temperature, and acquiring a second voltage drop of the diode.

3. The control circuit of the cooking appliance according to claim 2, wherein the step of controlling the operation of the heating device according to the first voltage drop by the controller 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 working based on the absolute value of the difference value being less than or equal to a first set value;

and controlling the heating device to stop working based on the fact that the absolute value of the difference is larger than a first set value.

4. The control circuit of the cooking appliance according to claim 1, wherein the step of controlling the operation of the heating device according to the first voltage drop by the controller specifically comprises:

controlling the heating device to continue to work based on the value of 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.

5. The control circuit of the cooking appliance according to any one of claims 1 to 4, further comprising:

and a first end of the capacitive element is connected with the cathode of the diode, a second end of the capacitive element is connected with the anode of the diode, and a second end of the capacitive element is connected with the controller.

6. The control circuit of a cooking appliance according to claim 5,

the diode is a photodiode.

7. A control method for a control circuit of a cooking appliance according to any one of claims 1 to 6, 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.

8. The method of claim 7, wherein the step of controlling the operation of the heating device based on the first pressure drop is preceded by the step of:

and determining the working condition temperature of the heating device to be a first set temperature, and acquiring a second voltage drop of the diode.

9. The control method according to claim 8, wherein the step of 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 working based on the absolute value of the difference value being less than or equal to a first set value;

and controlling the heating device to stop working based on the fact that the absolute value of the difference is larger than a first set value.

10. The control method according to claim 7, wherein the step of controlling the operation of the heating device according to the first pressure drop comprises:

controlling the heating device to continue to work based on the value of 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.

11. A cooking appliance, comprising:

a housing;

a heating device disposed within the housing;

a panel disposed on the housing;

the control circuit of the cooking appliance according to any one of the claims 1 to 6, wherein the diode is spaced from the panel.

12. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the control method according to any one of claims 7 to 10.

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 cookware is indirectly measured through the thermosensitive assembly below the cooker panel. Because the cooktop plate is made of microcrystalline glass material with a thickness of 4 mm, the thermal conductivity of the cooktop plate is not ideal. Therefore, the temperature measurement of the cookware is not accurate. In the cooking process, the dry burning of the cookware cannot be judged in time, so that potential safety hazards are easily caused.

Disclosure of Invention

The present invention is directed to solving one of the technical problems of the prior art or the related art.

To this end, a first aspect of the 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 invention is directed to a computer-readable storage medium.

In view of this, according to a first aspect of the present invention, a control circuit of a cooking appliance is provided, the cooking appliance comprising a heating device, the control circuit comprising: the first end of the resistive element is used for being connected with a power supply; 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 ground terminal; and the controller is connected with the anode of the diode and the cathode of the diode and is used for determining a 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 provided by the invention 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 ground terminal, and current flows in from the cathode of the diode and flows out from the anode of the diode after flowing through the resistive element from the power supply. The diode is arranged in the cooking appliance as a temperature sensing element, and it is understood that the diode is not completely ideally cut off when it is cut off in the reverse direction. When subjected to a reverse voltage, a slight current will leak from the cathode to the anode of the diode. This current is usually small and the higher the ambient temperature the diode is located, the larger the leakage current, the higher the voltage drop at the diode is detected, the ambient temperature 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 first voltage drop at the diode and controls the heating device in the cooking appliance 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 positioned. Carry out temperature measuring through the diode to cooking utensil, control heating device in the cooking utensil according to the cooking utensil's that the diode detected temperature, avoid taking place in the cooking utensil dry combustion method phenomenon, compare and utilize thermistor to detect cooking utensil's temperature among the prior art, have need not and wait to detect the attached setting of piece, detect fastly to the security performance has been improved, and the cost is lower.

In addition, according to the control circuit of the cooking appliance in the above technical solution provided by the present invention, the following additional technical features may be further provided:

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 that the working condition temperature of the heating device is set as the set temperature according to the step of controlling the heating device to work through the first voltage drop of the diode, obtains the second voltage drop of the diode, selects the set temperature as the normal temperature of the cooking appliance in the non-working state of the heating device, obtains 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 technical solutions, 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 working based on the absolute value of the difference value being less 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.

In the technical scheme, the absolute value of the difference value between the first voltage drop and the second voltage drop is calculated, the 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 less 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 greater 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 cooking appliance is prevented from being damaged by dry burning, whether the cooking appliance is in the dry burning state is judged through the change of the voltage drop at the reverse connection diode, the cooking appliance is controlled according to the judgment result, the problem that the temperature of the cooking appliance is too high is avoided, compared with the method that the cooking appliance is controlled according to the temperature detected by a thermistor in the related technology, the detection control speed is higher, and the cooking utensil has lower production cost.

In any of the above technical solutions, 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 working based on the value of 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 the second set value.

In the technical scheme, in the process of operating the cooking appliance, the detected value of the first voltage drop is smaller than or equal to the second set value, the temperature detected by the diode is judged not to reach the set temperature, the heating device is controlled to continue working, 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 cooking appliance is prevented from being damaged by dry burning, whether the cooking appliance is in the dry burning state or not is judged by the change of the voltage drop at the reverse connection diode, the cooking appliance is controlled according to the judgment result, the problem of avoiding the overhigh temperature of the cooking appliance is solved, and compared with the method for controlling the cooking appliance according to the thermistor detection temperature in the related technology, the detection control speed is high, and the production cost of the cooking appliance is low.

In any of the above technical solutions, the control circuit further includes: and a first end of the capacitive element is connected with the cathode of the diode, a second end of the capacitive element is connected with the anode of the diode, and a second end of the capacitive element is connected with the controller.

In the technical scheme, the temperature detection circuit further comprises a capacitive element, a first end of the capacitive element is connected with a cathode of the diode, a second end of the capacitive element is connected with an anode of the diode, a second end of the capacitive element is connected with the control, and the capacitive element can filter a signal with voltage drop acquired by the controller from the diode, so that the first voltage drop or the second voltage drop acquired by the controller is more accurate, and the control efficiency of the control circuit pair is further improved.

In any of the above technical solutions, 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 aspects, the control method comprising: determining a first voltage drop of the diode; the operation of the heating device is controlled in accordance with the first pressure drop.

According to the technical scheme, the heating device in the cooking appliance is controlled 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 positioned. Carry out temperature detection to cooking utensil through the diode, control heating device in the cooking utensil according to the cooking utensil's that the diode detected temperature, compare and utilize thermistor to detect cooking utensil's temperature among the prior art, have need not with wait to detect the attached setting of piece, detect fastly to the cost is lower.

It will be appreciated that the diode is not perfectly cut off when it is cut off in the reverse direction. When subjected to a reverse voltage, a slight current will leak from the cathode to the anode of the diode. This current is usually small and the higher the ambient temperature the diode is located, the larger the leakage current, the higher the voltage drop at the diode is detected, the ambient temperature the diode is located can be detected by detecting the voltage drop at the diode.

In addition, according to the control method in the above technical solution provided by the present invention, the following additional technical features may also be provided:

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 as a first set temperature, and acquiring a second voltage drop of the diode.

In the technical scheme, the working condition temperature of the heating device is determined to be set temperature according to the step of controlling the working of the heating device according to the first voltage drop of the diode, the second voltage drop of the diode is obtained, the set temperature is selected to be normal temperature in the non-working state of the heating device in the cooking appliance, the second voltage drop of the diode of the heating device in the normal temperature state is obtained, and the second voltage drop is used as the initial voltage drop of the diode.

In any of the above technical solutions, 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 working based on the absolute value of the difference value being less 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.

In the technical scheme, the absolute value of the difference value between the first voltage drop and the second voltage drop is calculated, the 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 less 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 greater 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 cooking appliance is prevented from being damaged by dry burning, whether the cooking appliance is in the dry burning state is judged through the change of the voltage drop at the reverse connection diode, the cooking appliance is controlled according to the judgment result, the problem that the temperature of the cooking appliance is too high is avoided, compared with the method that the cooking appliance is controlled according to the temperature detected by a thermistor in the related technology, the detection control speed is higher, and the cooking utensil has lower production cost.

In any of the above technical solutions, the step of controlling the operation of the heating device according to the first pressure drop specifically includes: controlling the heating device to continue working based on the value of 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 the second set value.

In the technical scheme, in the process of operating the cooking appliance, the detected value of the first voltage drop is smaller than or equal to the second set value, the temperature detected by the diode is judged not to reach the set temperature, the heating device is controlled to continue working, 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 cooking appliance is prevented from being damaged by dry burning, whether the cooking appliance is in the dry burning state or not is judged by the change of the voltage drop at the reverse connection diode, the cooking appliance is controlled according to the judgment result, the problem of avoiding the overhigh temperature of the cooking appliance is solved, and compared with the method for controlling the cooking appliance according to the thermistor detection temperature in the related technology, the detection control speed is high, and the production cost of the cooking appliance is low.

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; the panel is arranged on the shell; according to the control circuit of the cooking appliance in any technical scheme, the diodes in the control circuit of the cooking appliance are arranged at intervals with the panel.

In this technical solution, the cooking appliance includes a housing, a heating device, a panel, and the control circuit of the cooking appliance in any one of the above technical solutions, so that the beneficial technical effects of the control circuit of the cooking appliance in any one of the above technical solutions are achieved, and no redundant description is provided herein.

The diode in the control circuit is used as a temperature sensing element in the cooking utensil, the diode and the panel of the cooking utensil for heating are arranged at intervals, the diode and the heating panel are arranged at intervals and can sense the temperature at the position of the heating panel, the diode and the heating panel are not required to be attached to the heating panel, and the failure rate of the temperature sensing element in the cooking utensil is reduced.

According to a fourth aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor, implements the control method according to any one of the above-mentioned aspects. Therefore, the method has all the beneficial technical effects of the control method in any one of the 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, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a circuit diagram of a control circuit of a cooking appliance of an embodiment of the present invention;

fig. 2 shows a circuit diagram of a control circuit of a cooking appliance of another embodiment of the present invention;

FIG. 3 shows a flow diagram of a control method of one embodiment of the invention;

FIG. 4 shows a flow chart diagram of a control method of another embodiment of the present invention;

FIG. 5 shows a flow chart diagram of a control method of yet another embodiment of the present invention;

FIG. 6 is a flow chart illustrating a control method according to an embodiment of the present invention;

FIG. 7 is a flow chart illustrating a control method according to another embodiment of the present invention;

FIG. 8 is a logarithmic graph showing the leakage current temperature characteristic of the diode of the present invention;

fig. 9 is a graph showing a leakage current temperature characteristic of the diode of the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 2 is:

100 resistive element, 200 diodes, 300 capacitive element, 400 controller.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A control circuit, a control method, a cooking appliance, and a computer-readable storage medium of a cooking appliance according to some embodiments of the present invention are described below with reference to fig. 1 to 9.

The first embodiment is as follows:

as shown in fig. 1, in one embodiment of the present invention, there is provided a control circuit of a cooking appliance, the 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 supply; a diode 200, a cathode of the diode 200 is connected to the second end of the resistive element 100, and an anode of the diode 200 is connected to the ground terminal; and a controller 400, wherein the controller 400 is connected with the anode of the diode 200 and the cathode of the diode 200, and the controller 400 is used for determining a first voltage drop of the diode 200 and controlling the operation of the heating device according to the first voltage drop.

In this embodiment, the control circuit of the cooking appliance includes a resistive element 100, a diode 200, and a controller 400, one end of the resistive element 100 is connected to a power supply, the other end of the resistive element 100 is connected to a cathode of the diode 200, the resistive element 100 performs a voltage division function, an anode of the diode 200 is connected to a ground terminal, and a current flows from the power supply through the resistive element 100, flows from the cathode of the diode 200, and flows from the anode of the diode 200. The diode 200 is provided as a temperature sensing element in the cooking appliance, and it is understood that the diode 200 is not completely ideally cut off when it is cut off in the reverse direction. When subjected to a reverse voltage, a slight current will leak from the cathode to the anode of the diode 200. This current is usually small, and the higher the ambient temperature of the diode 200, the larger the leakage current, the higher the voltage drop at the diode 200, the ambient temperature of the diode 200 can be detected.

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. Carry out temperature detection to cooking utensil through diode 200, control heating device among the cooking utensil according to the cooking utensil's that diode 200 detected temperature, compare in prior art and utilize thermistor to detect cooking utensil's temperature, have need not with wait to detect the attached setting of an, detect fastly to the cost is lower.

Example two:

as shown in fig. 2, in one embodiment of the present invention, there is provided a control circuit of a cooking appliance, the 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 supply; a diode 200, a cathode of the diode 200 is connected to the second end of the resistive element 100, and an anode of the diode 200 is connected to the ground terminal; and a capacitive element 300, wherein 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, and a second end of the capacitive element 300 is connected to the controller 400.

And a controller 400, wherein the controller 400 is connected with the anode of the diode 200 and the cathode of the diode 200, and the controller 400 is used for determining a first voltage drop of the diode 200 and controlling 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 a negative electrode of the diode 200, a second end of the capacitive element 300 is connected to a positive electrode of the diode 200, and a second end of the capacitive element 300 is connected to a control, and the capacitive element 300 can filter a signal with a voltage drop acquired by the controller 400 from the diode 200, so that the first voltage drop or the second voltage drop acquired by the controller 400 is more accurate, and the control efficiency of the control circuit 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: and determining the working condition temperature of the heating device as the set temperature, and acquiring the second pressure of the diode 200.

In this embodiment, the controller 400 determines that the operating temperature of the heating device is the set temperature according to the step of controlling the operation of the heating device according to the first voltage drop of the diode 200, obtains the second voltage drop of the diode 200, and obtains the second voltage drop of the diode of the heating device in the normal temperature state, where the set temperature is selected as the normal temperature of the cooking appliance in the non-operating state, and uses 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 working based on the absolute value of the difference value being less 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.

In this embodiment, the absolute value of the difference between the first voltage drop and the second voltage drop is calculated, the absolute value reflects the temperature of the environment where the diode 200 is located, if the absolute value of the difference is less 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 operate, if the absolute value of the difference is greater than the first set value, it is determined that the cooking appliance is in a dry-fire state, the heating device is controlled to stop operating, the cooking appliance is prevented from being damaged by dry-fire, it is determined whether the cooking appliance is in the dry-fire state through the change of the voltage drop at the reverse diode 200, the cooking appliance is controlled according to the determination result, thereby avoiding the problem of the over-high temperature of the cooking appliance, 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 cooking utensil has lower production cost.

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 working based on the value of 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 the second set value.

In this embodiment, in the process of operating the cooking appliance, the detected first voltage drop value is less 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 greater than the first set value, it is determined that the cooking appliance is in the dry-fire state, the heating device is controlled to stop operating, the dry-fire damage of the cooking appliance is prevented, it is determined whether the cooking appliance is in the dry-fire state through the change of the voltage drop at the reverse connection diode 200, the cooking appliance is controlled according to the determination result, the problem of excessive temperature of the cooking appliance is avoided, and compared with the related art that the cooking appliance is controlled according to the temperature detected by the thermistor, the detection control speed is high, and the production cost of the cooking appliance is low.

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 varies with a change in temperature, and the dark current refers to a current flowing in the photodiode in a state where no light is irradiated. The increase in temperature causes electrons in the valence band to become more active and to be excited to the conduction band, with a significant increase in dark current with increasing temperature.

As shown in fig. 8, in the case of leakage current values of the photodiode at different temperatures, where the power supply is 5v and the resistive element is 5.1k Ω, the leakage current of the photodiode increases exponentially as the temperature is higher, and the specific correspondence between the 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

Example three:

as shown in fig. 3, in an embodiment of the present invention, there is provided a control method including:

step S302, determining a first voltage drop of a diode;

and 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 in dependence on 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 positioned. Carry out temperature detection to cooking utensil through the diode, control heating device in the cooking utensil according to the cooking utensil's that the diode detected temperature, compare and utilize thermistor to detect cooking utensil's temperature among the prior art, have need not with wait to detect the attached setting of piece, detect fastly to the cost is lower.

It will be appreciated that the diode is not perfectly cut off when it is cut off in the reverse direction. When subjected to a reverse voltage, a slight current will leak from the cathode to the anode of the diode. This current is usually small and the higher the ambient temperature the diode is located, the larger the leakage current, the higher the voltage drop at the diode is detected, the ambient temperature the diode is located can be detected by detecting the voltage drop at the diode.

Example four:

as shown in fig. 4, in another embodiment of the present invention, 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 to be a first set temperature, and obtaining a second voltage drop of the diode;

step S406, 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 being less than or equal to a first set value, and controlling the heating device to stop working based on the absolute value of the difference being greater than the first set value.

In this embodiment, the working temperature of the heating device is determined as the set temperature according to the step of controlling the operation of the heating device according to the first voltage drop of the diode, the second voltage drop of the diode is obtained, the set temperature is selected as the normal temperature of the cooking appliance in the non-operating state of the heating device, the second voltage drop of the diode in the normal temperature state of the heating device is obtained, and the second voltage drop is used as the initial voltage drop of the diode. Calculating the absolute value of the difference between the first voltage drop and the second voltage drop, wherein the absolute value can reflect the temperature of the environment where the diode is located, if the absolute value of the difference is less than or equal to a first set value, the temperature detected by the diode is judged not to reach the set temperature, controlling the heating device to continue working, if the absolute value of the difference is greater than the first set value, judging that the cooking utensil is in a dry-fire state, controlling the heating device to stop working to prevent the cooking utensil from being damaged by dry-fire, judging whether the cooking utensil is in the dry-fire state or not through the change of the voltage drop at the reverse diode, control cooking utensil according to the judged result, realized avoiding cooking utensil high temperature's problem to take place, compare in the correlation technique and detect the temperature according to thermistor and control cooking utensil, it is very fast to have a detection control speed, and cooking utensil manufacturing cost is lower.

Example five:

as shown in fig. 5, in still another embodiment of the present invention, there is provided a control method including:

step S502, determining a first voltage drop of a diode;

and step S504, controlling the heating device to continue working based on the first pressure drop value being less than or equal to the second set value, and controlling the heating device to stop working based on the first pressure drop value being greater than the second set value.

In the embodiment, in the process of operating the cooking appliance, the detected value of the first voltage drop is less than or equal to the second 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, the absolute value of the difference is greater 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 appliance is prevented, whether the cooking appliance is in the dry burning state is judged through the change of the voltage drop at the reverse connection diode, the cooking appliance is controlled according to the judgment result, the problem of overhigh temperature of the cooking appliance is avoided, and compared with the related technology that the cooking appliance is controlled according to the temperature detected by the thermistor, the detection control speed is high, and the production cost of the cooking appliance is low.

Example six:

as shown in fig. 6, in an embodiment of the present invention, a control method is provided, including:

step S602, determining a first voltage drop U0 of a diode;

step S604, judging whether U0 is more than A, if not, executing step S606, if so, executing step S610;

step S606, judging dry burning;

step S608, stop heating

And step S610, heating normally.

Wherein A is more than or equal to 0.01V and less than or equal to 2.5V.

As shown in fig. 7, in another embodiment of the present invention, 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 not, executing step S708, and if so, executing step S712;

step S708, judging dry burning;

step S710, stopping heating

Step S712, normal heating.

Wherein, B is more than or equal to 0.05V and less than or equal to 5V.

In this embodiment, the value of the voltage 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. Whether the cookware is dry-burned or not is determined by judging the voltage drop of the diode.

Specifically, the temperature is above 300 ℃ when the pot is dry-burned. The power supply voltage is set to be 5V, the resistive element is 10K omega, the leakage current is 0.25uA at the normal temperature of 25 ℃, the diode voltage is 4.9975V, the leakage current is 77.55uA at the high temperature of 300 ℃, and the diode voltage is 4.225V, so that an approximate temperature value can be easily obtained through a voltage value. When the photodiode is around the pot, the dry-burning state is identified through the voltage drop of the diode.

Example 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; the panel is arranged on the shell; according to the control circuit of the cooking appliance in any technical scheme, the diodes in the control circuit of the cooking appliance are arranged at intervals with the panel.

In this embodiment, the cooking appliance includes a housing, a heating device, a panel, and the control circuit of the cooking appliance in any one of the above technical solutions, so that the beneficial technical effects of the control circuit of the cooking appliance in any one of the above embodiments are achieved, and redundant description is not repeated herein.

The diode in the control circuit is used as a temperature sensing element in the cooking utensil, the diode and the panel of the cooking utensil for heating are arranged at intervals, the diode and the heating panel are arranged at intervals and can sense the temperature at the position of the heating panel, the diode and the heating panel are not required to be attached to the heating panel, and the failure rate of the temperature sensing element in the cooking utensil is reduced.

Example eight:

in an embodiment of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and the computer program is executed by a processor to implement the control method in any one of the above technical solutions. Therefore, the method has all the beneficial technical effects of the control method in any of the above embodiments, 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," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 invention. In this specification, the schematic representations of the terms used above 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 a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.