Control circuit and electric cooking appliance

Abstract

The present application relates to a control circuit and an electric cooking appliance, wherein the control circuit includes a switching temperature control module, a first heating element and a second heating element; the switching temperature control module is connected in series with the second heating element to form a series module; the series module is connected in parallel with the first heating element; the power of the first heating element is less than the power of the second heating element; the switching temperature control module includes a gear switch and a temperature control unit; the gear switch includes an input end and multiple output ends; each output end of the gear switch is connected to one end of the second heating element through a temperature control unit. Through the present application, the problem of single function in the related art, that the working state of the heating plate can only be switched by adjusting the gear, is solved, and multiple cooking functions are realized by selecting different gears of the gear switch; the heating temperature is adjusted in a buffered manner to maintain a relatively stable temperature for cooking and ensure the cooking effect.

Description

Technical Field

[0001] The present application relates to the technical field of cooking appliances, and in particular to a control circuit and an electric cooking appliance. Background Art

[0002] Electric cooking appliances on the market use control circuits to control the cooking process. For mechanical electric cookers, the control circuit includes a gear toggle switch and a heating plate. The gear toggle switch is used to select the heating power and the main switch. By turning the gear toggle switch to the heating gear, the heating plate is turned on for steaming and heating. The disadvantage of this solution is that it has a single function and can only switch the working state of the heating plate by adjusting the gear, resulting in poor cooking results.

[0003] There is currently no effective solution to the problem that the related technology has a single function and can only switch the working state of the heating plate by adjusting the gear, resulting in poor cooking results. Summary of the invention

[0004] In this embodiment, a control circuit and an electric cooking appliance are provided to solve the problem in the related art that the function is single and the working state of the heating plate can only be switched by adjusting the gear position, resulting in poor cooking effect.

[0005] In a first aspect, a control circuit is provided in this embodiment, including a switching temperature control module, a first heating element, and a second heating element;

[0006] The switching temperature control module is connected in series with the second heating element to form a series module; the series module is connected in parallel with the first heating element; the power of the first heating element is less than the power of the second heating element;

[0007] The switching temperature control module includes a gear switch and a temperature control unit;

[0008] The gear switch includes an input end and multiple output ends; each of the output ends of the gear switch is connected to one end of the second heating element through one of the temperature control units.

[0009] Through this embodiment, various cooking functions are realized by selecting different gears of the gear switch; combined with the above-mentioned simple circuit structure, the series module is connected in parallel with the first heating element, so that the first heating element is always in a working state after power is turned on; the temperature control unit controls the working state of the corresponding second heating element; when the second heating element is in a working state, combined with the working state switching of the first heating element, the heating temperature can be buffered and adjusted to maintain a relatively stable temperature for cooking and ensure the cooking effect.

[0010] In some of the embodiments, the temperature control unit sets a switching parameter; a switching temperature in the switching parameter is related to a preset cooking function.

[0011] In some of the embodiments, the preset cooking function is a soup-making function, and the switching temperature in the switching parameter is set to a first switching temperature;

[0012] The preset cooking function is a steaming function, and the switching temperature in the switching parameter is set to a second switching temperature;

[0013] The preset cooking function is a frying and grilling function, and the switching temperature in the switching parameter is set to a third switching temperature;

[0014] The first switching temperature is lower than the second switching temperature, and the second switching temperature is lower than the third switching temperature.

[0015] In some embodiments, the first switching temperature is 105°C to 115°C; the second switching temperature is 115°C to 135°C; and the third switching temperature is 165°C to 205°C.

[0016] In some of the embodiments, the control circuit further includes an indicator light;

[0017] The indicator light is connected in parallel with the series module and is used to indicate the working state of the control circuit.

[0018] In some of the embodiments, the input end of the gear switch (11) is connected to the live wire of the external power supply; and the other end of the second heating element (30) is connected to the neutral wire of the external power supply.

[0019] In some of the embodiments, the control circuit further includes a timer;

[0020] The timer is arranged between the input end of the gear switch and the live wire of the external power supply, and is used to control the working time of the control circuit.

[0021] In some of the embodiments, the control circuit further includes a first protection module and a second protection module;

[0022] The first protection module is arranged between the switching temperature control module and the live wire of the external power supply, and is used to protect the control circuit;

[0023] The second protection module is disposed between the second heating element and the neutral line of the external power supply, and is used to protect the control circuit.

[0024] In some embodiments, the first protection module is a thermal fuse; the second protection module is a thermostat.

[0025] In a second aspect, an electric cooking appliance is provided in this embodiment, comprising the control circuit as described in the first aspect.

[0026] Compared with the related art, the control circuit and electric cooking appliance provided in this embodiment, wherein the control circuit includes a switching temperature control module, a first heating element and a second heating element; the switching temperature control module is connected in series with the second heating element to form a series module; the series module is connected in parallel with the first heating element; the power of the first heating element is less than the power of the second heating element; the switching temperature control module includes a gear switch and a temperature control unit; the gear switch includes an input end and multiple output ends; each output end of the gear switch is connected to one end of the second heating element through a temperature control unit; the problem of single function in the related art that the working state of the heating plate can only be switched by adjusting the gear, and multiple cooking functions are realized by selecting different gears of the gear switch; combined with a simple circuit structure, when the second heating element is in a working state, combined with the working state switching of the first heating element, the heating temperature is buffered and adjusted to maintain a relatively stable temperature for cooking and ensure the cooking effect.

[0027] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0029] Figure 1 is a schematic diagram of a control circuit provided in the first embodiment of the present application;

[0030] Figure 2 is a schematic diagram of a control circuit provided in the second embodiment of the present application;

[0031] Figure 3 It is a schematic diagram of a control circuit provided in the third embodiment of the present application.

[0032] In the figure: 11, gear switch; 12, temperature control unit; 20, first heating element; 30, second heating element; 40, indicator light; 50, timer; 60, first protection module; 70, second protection module. DETAILED DESCRIPTION

[0033] In order to more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0034] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meaning understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the", "these" and the like in this application do not represent quantitative restrictions, and they can be singular or plural. The terms "include", "comprise", "have" and any variants thereof involved in this application are intended to cover non-exclusive inclusions; for example, a process, method and system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether directly or indirectly. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. Usually, the character " / " indicates that the objects associated with each other are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0035] In this embodiment, a control circuit is provided. Figure 1 Schematic diagram of the structure of the control circuit of this embodiment. Figure 1 As shown, the control circuit includes: a switching temperature control module, a first heating element 20 and a second heating element 30;

[0036] The switching temperature control module is connected in series with the second heating element 30 to form a series module; the series module is connected in parallel with the first heating element 20; the power of the first heating element 20 is less than the power of the second heating element 30;

[0037] The switching temperature control module includes a gear switch 11 and a temperature control unit 12;

[0038] The gear switch 11 includes an input end and a plurality of output ends; each output end of the gear switch 11 is connected to one end of the second heating element 30 via a temperature control unit 12 .

[0039] It should be noted that the first heating element 20 and the second heating element 30 are both resistive heating devices, which can heat the pot body after being powered on, thereby cooking the cooking object in the pot body. The first heating element 20 and the second heating element 30 can be arranged around the pot body; preferably, the first heating element 20 and the second heating element 30 are arranged below the pot body to reduce heat loss. The power selection and heating time of the first heating element 20 and the second heating element 30 will affect the cooking effect, so the gear switch 11 and the temperature control unit 12 in the switching temperature control module are used to control the power and heating time.

[0040] Since the switching temperature control module is connected in series with the second heating element 30 to form a series module, and the series module is connected in parallel with the first heating element 20; therefore, after the control circuit is energized, the first heating element 20 works continuously, and the different gear selections of the gear switch 11 in the switching temperature control module control whether the second heating element 30 is working.

[0041] For example, the gear switch 11 has two gears (first gear and second gear) and a normally open gear; then the corresponding gear switch 11 includes an input end and two output ends (the first output end corresponds to the first gear, and the second output end corresponds to the second gear); the temperature control unit 12 includes a first temperature control subunit and a second temperature control subunit; the input end of the gear switch 11 is connected to the live wire of the external power supply; the first output end of the gear switch 11 is connected to one end of the second heating element 30 through the first temperature control subunit; the second output end of the gear switch 11 is connected to one end of the second heating element 30 through the second temperature control subunit. Among them, the first temperature control subunit and the second temperature control subunit can both be thermostats.

[0042] The working principle is explained below:

[0043] After the control circuit is powered on, the first heating element 20 is powered on and continues to operate.

[0044] When the gear switch 11 is in the normally open position, the second heating element 30 does not work.

[0045] When the gear switch 11 selects the first gear, the input end is connected to the first output end and the first temperature control subunit, and under the influence of the first temperature control subunit, the second heating element 30 starts to work. Among them, the power of the first heating element 20 is less than the power of the second heating element 30, and the second heating element 30 is mainly used to maintain the heating temperature and realize precise control of the heating temperature. Specifically: when the first temperature control subunit detects that the ambient temperature reaches the set switching temperature, the first temperature control subunit is in an open circuit state, so that the second heating element 30 stops working. At this time, although the first heating element 20 is still in a working state, the ambient temperature will continue to decrease. When it drops to the reset temperature of the first temperature control subunit, the first temperature control subunit returns to the on state, and then the second heating element 30 starts working again.

[0046] When the gear switch 11 is in the second gear, the input end is connected to the second output end and the second temperature control subunit, and under the influence of the second temperature control subunit, the second heating element 30 starts to work. Specifically, when the second temperature control subunit detects that the ambient temperature reaches the set switching temperature, the second temperature control subunit is in a disconnected state, so that the second heating element 30 stops working. At this time, although the first heating element 20 is still in the working state, the ambient temperature will continue to decrease. When it decreases to the reset temperature of the second temperature control subunit, the second temperature control subunit returns to the connected state, and the second heating element 30 starts to work again.

[0047] Therefore, cooking at different temperatures can be achieved by setting different switching parameters for the temperature control unit 12 .

[0048] The control circuit in the related art includes a gear toggle switch and a heating plate, and the gear toggle switch is used to select the heating power and the use of the main switch. By toggling the gear toggle switch to the heating gear, the heating plate is operated to perform steaming and heating. There is a single function, and the working state of the heating plate can only be switched by adjusting the gear, resulting in poor cooking effect. In this embodiment, the cooperation of the first heating element 20 and the second heating element 30 is used to provide a variety of heating power options and enrich the heating methods; combined with the cooperation of the gear switch 11 and the temperature control unit 12 in the switching temperature control module, the cooking function of different temperatures is realized; wherein, the temperature control unit 12 can realize precise control of the heating temperature to maintain a stable temperature for cooking and ensure the cooking effect.

[0049] The following is a detailed description of each of the above components:

[0050] In some of the embodiments, the temperature control unit 12 sets a switching parameter; the switching temperature in the switching parameter is related to a preset cooking function.

[0051] Specifically, the switching parameters are pre-set in the temperature control unit 12, and the switching parameters include the switching temperature; the switching temperature in the switching parameters can be pre-set according to the preset cooking function. The switching parameters include but are not limited to the switching temperature and the reset temperature. Cooking functions include but are not limited to soup making function, steaming function, frying and baking function, etc. For different cooking functions, switching parameters matching the cooking functions will be set. Preferably, the reset temperature can be set to 5°C lower than the switching temperature. Of course, the reset temperature can also be set to other temperature values, and there is no limitation on this.

[0052] Through this embodiment, the switching temperature in the switching parameters related to the preset cooking function is used to effectively and accurately control the cooking temperature during the cooking process, thereby achieving the expected cooking effect and simplifying the user operation process.

[0053] In some embodiments, the preset cooking function is a soup-making function, and the switching temperature in the switching parameter is set to a first switching temperature;

[0054] The preset cooking function is the steaming function, and the switching temperature in the switching parameters is set to the second switching temperature;

[0055] The preset cooking function is the frying and roasting function, and the switching temperature in the switching parameters is set to the third switching temperature;

[0056] The first switching temperature is lower than the second switching temperature, and the second switching temperature is lower than the third switching temperature.

[0057] Specifically, the switching temperature in the switching parameter is related to the preset cooking function; in this embodiment, the switching temperature matched by the soup-making function is the first switching temperature; the switching temperature matched by the steaming function is the second switching temperature; and the switching temperature matched by the frying and roasting function is the third switching temperature. Since the cooking temperature required for the frying and roasting function is the highest and the cooking temperature required for the soup-making function is the lowest, the relationship among the first switching temperature, the second switching temperature and the third switching temperature is: the first switching temperature is less than the second switching temperature, and the second switching temperature is less than the third switching temperature.

[0058] Specifically, the first switching temperature is 105° C. to 115° C., preferably 110° C.; the second switching temperature is 115° C. to 135° C., preferably 125° C.; the third switching temperature is 165° C. to 205° C., preferably 185° C. In other embodiments, the specific temperature values ​​of the first switching temperature, the second switching temperature and the third switching temperature are not limited.

[0059] After the switching parameters of the temperature control unit 12 are set, the cooking function of the gear corresponding to the temperature control unit 12 (the gear selected by the gear switch 11) is relatively determined. For example, if the switching parameter of the temperature control unit 12 is the second switching temperature, the cooking function corresponding to the gear is the steaming function. If the user wants to select the steaming function, he only needs to turn the gear switch 11 to the gear.

[0060] In this embodiment, corresponding switching temperatures are set according to different cooking functions, which can simplify the user operation process and facilitate user use while ensuring the cooking effect.

[0061] It should be noted that since the first heating element 20 works continuously after being powered on, if the first heating element 20 works continuously, the cooking temperature will continue to rise, and this method will have the risk of continuous heating. In order to avoid the risk of continuous heating, the first heating element 20 is a low-power heating tube, and the second heating element 30 is a high-power heating tube. Even if the first heating element 20 continues to heat, it will only maintain the cooking temperature or slowly reduce the cooking temperature, and will not cause the cooking temperature to continue to rise.

[0062] Preferably, the power of the first heating element 20 is 200W to 600W, and the power of the first heating element 20 can be selected to be 500W. The power of the second heating element 30 is 500W to 1500W, and the power of the second heating element 30 can be selected to be 1000W. The power of the first heating element 20 and the power of the second heating element 30 can be set according to the usage scenario, for example: the power of the first heating element 20 is 200W, the power of the second heating element 30 is 500W, etc., and there is no limitation on this.

[0063] Through this embodiment, the power selection of the first heating element 20 and the second heating element 30 is utilized to avoid the risk caused by continuous heating and improve the safety of use.

[0064] In some embodiments, such as Figure 2 As shown, in Figure 1 On the basis, the control circuit further includes an indicator light 40;

[0065] The indicator light 40 is connected in parallel with the series module to indicate the working state of the control circuit.

[0066] Specifically, the indicator light 40 is connected in parallel with the series module, and it can also be considered that the indicator light 40 is connected in parallel with the first heating element 20. If the first heating element 20 (or the series module) is powered on at both ends, when the first heating element 20 is working, the indicator light 40 is also powered on and lit; at this time, the control circuit is in a working state; if the first heating element 20 (or the series module) is powered off at both ends, when the first heating element 20 is not working, the indicator light 40 is not powered on at both ends and is extinguished; at this time, the control circuit is in a closed state. In other embodiments, the indicator light 40 can be replaced by a buzzer, a voice module, or other devices, which are not illustrated one by one.

[0067] Through this embodiment, the indicator light 40 is used to indicate the working status of the control circuit, so that the user can understand the status of the control circuit and use it conveniently.

[0068] In some of the embodiments, an input end of the gear switch 11 is connected to a live wire of an external power source; and the other end of the second heating element 30 is connected to a neutral wire of the external power source.

[0069] Through this embodiment, the control circuit is directly connected to the neutral line and the live line for use, so as to simplify the overall circuit structure.

[0070] In some of these embodiments, the control circuit further includes a timer 50;

[0071] The timer 50 is arranged between the input end of the gear switch 11 and the live wire of the external power supply, and is used to control the working time of the control circuit.

[0072] Specifically, the timer 50 can be a mechanical timer or an electronic timer. If it is a mechanical timer, when the mechanical knob is rotated to a specified position, the time for timing off is set, the mechanical timer is closed, and the external power supply supplies power to the control circuit. When the set time is reached, the mechanical timer is disconnected, and the external power supply stops supplying power to the control circuit. The electronic timer is also implemented using the corresponding principle, which will not be repeated here.

[0073] Through this embodiment, the timer 50 is used as the master control to control the working time of the control circuit, and a timing function is added to simplify the overall circuit structure.

[0074] In some embodiments, such as Figure 3 As shown, in Figure 1 On the basis, the control circuit further includes a first protection module 60 and a second protection module 70;

[0075] A first protection module 60 is provided between the switching temperature control module and the live wire of the external power supply, and is used to protect the control circuit;

[0076] The second protection module 70 is disposed between the second heating element 30 and the neutral line of the external power supply, and is used to protect the control circuit.

[0077] Specifically, the first protection module 60 is a thermal fuse, which is arranged between the switching temperature control module and the live wire of the external power supply, and its fusing temperature is 195°C to 235°C. Preferably, the fusing temperature of the thermal fuse is 215°C. When the fusing temperature of the thermal fuse reaches 215°C, the thermal fuse is blown to protect the control circuit. Preferably, if the control circuit has a timer 50, then the first protection module 60 is arranged between the timer 50 and the live wire of the external power supply.

[0078] The second protection module 70 is a thermostat, which is arranged between the second heating element 30 and the neutral line of the external power supply, and can be arranged below the pot body, and its switching temperature is 200°C to 240°C. Preferably, the switching temperature of the thermostat is 120°C. When it is detected that the ambient temperature reaches 120°C, the thermostat is disconnected to protect the control circuit.

[0079] Through this embodiment, a dual protection mechanism of the first protection module 60 combined with the second protection module 70 is adopted, which greatly improves the safety of use.

[0080] It should be noted that the above modules can be functional modules or program modules, and can be implemented by software or hardware. For modules implemented by hardware, the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0081] This embodiment also provides an electric cooking appliance, comprising the control circuit in each of the above embodiments.

[0082] The control circuits in the above embodiments can be applied to electric cooking appliances, including but not limited to electric lunch boxes, egg cookers, and yogurt machines.

[0083] The above-mentioned electric cooking appliance solves the problem of single function in the related art and the problem that the working state of the heating plate can only be switched by adjusting the gear. The gear switch 11 is used to select different gears to realize various cooking functions, and the heating temperature is controlled in combination with the temperature control unit 12 to maintain a stable temperature for cooking and ensure the cooking effect.

[0084] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementation modes, and will not be repeated in this embodiment.

[0085] It should be understood that the specific embodiments described herein are only used to explain the application, rather than to limit it. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of this application.

[0086] It should be understood that the specific embodiments described herein are only used to explain the application, rather than to limit it. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of this application.

[0087] Obviously, the drawings are only some examples or embodiments of the present application. For ordinary technicians in the field, the present application can also be applied to other similar situations based on these drawings without creative work. In addition, it is understandable that although the work done in this development process may be complicated and lengthy, for ordinary technicians in the field, certain changes in design, manufacturing or production based on the technical content disclosed in this application are only conventional technical means and should not be regarded as insufficient content disclosed in this application.

[0088] The term "embodiment" in this application refers to a specific feature, structure or characteristic described in conjunction with the embodiment that can be included in at least one embodiment of the present application. The appearance of this phrase in various locations in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. It is clearly or implicitly understood by those of ordinary skill in the art that the embodiments described in this application can be combined with other embodiments without conflict.

[0089] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of patent protection. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the attached claims.

Claims

1. A control circuit, characterized in that: It comprises a switching temperature control module, a first heating element (20) and a second heating element (30); The switching temperature control module is connected in series with the second heating element (30) to form a series module; the series module is connected in parallel with the first heating element (20); the power of the first heating element (20) is less than the power of the second heating element (30); The switching temperature control module comprises a gear switch (11) and a temperature control unit (12); The gear switch (11) comprises an input end and a plurality of output ends; each of the output ends of the gear switch (11) is connected to one end of the second heating element (30) via one of the temperature control units (12).

2. The control circuit according to claim 1, characterized in that: The temperature control unit (12) sets a switching parameter; the switching temperature in the switching parameter is related to a preset cooking function.

3. The control circuit according to claim 2, characterized in that: The preset cooking function is a soup-making function, and the switching temperature in the switching parameter is set to a first switching temperature; The preset cooking function is a steaming function, and the switching temperature in the switching parameter is set to a second switching temperature; The preset cooking function is a frying and grilling function, and the switching temperature in the switching parameter is set to a third switching temperature; The first switching temperature is lower than the second switching temperature, and the second switching temperature is lower than the third switching temperature.

4. The control circuit according to claim 3, characterized in that: The first switching temperature is 105°C to 115°C; the second switching temperature is 115°C to 135°C; and the third switching temperature is 165°C to 205°C.

5. The control circuit according to claim 1, characterized in that: The control circuit also includes an indicator light (40); The indicator light (40) is connected in parallel with the series module and is used to indicate the working state of the control circuit.

6. The control circuit according to claim 1, characterized in that: The input end of the gear switch (11) is connected to the live wire of the external power supply; the other end of the second heating element (30) is connected to the neutral wire of the external power supply.

7. The control circuit according to claim 6, characterized in that: The control circuit also includes a timer (50); The timer (50) is arranged between the input end of the gear switch (11) and the live wire of the external power supply, and is used to control the working time of the control circuit.

8. The control circuit according to claim 6, characterized in that: The control circuit further comprises a first protection module (60) and a second protection module (70); The first protection module (60) is arranged between the switching temperature control module and the live wire of the external power supply, and is used to protect the control circuit; The second protection module (70) is arranged between the second heating element (30) and the neutral line of the external power supply, and is used to protect the control circuit.

9. The control circuit according to claim 8, characterized in that: The first protection module (60) is a thermal fuse; the second protection module (70) is a temperature controller.

10. An electric cooking appliance, characterized in that: The method comprises a control circuit as claimed in any one of claims 1 to 9.

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