Food heating device and control method thereof

Abstract

The embodiment of the invention provides a food heating device and a control method thereof.The food heating device comprises a heating box and further comprises an electrode assembly, a temperature detection assembly and a control assembly, the electrode assembly and the temperature detection assembly are both connected with the control assembly, the electrode assembly is arranged in the heating box, and the temperature detection assembly is arranged on the electrode assembly; the temperature detection assembly is used for detecting the temperature of the electrode assembly, and the control assembly controls the heating speed of the electrode assembly according to the detected temperature. According to the embodiment, the temperature detection assembly monitors the electrode assembly in real time and the control assembly accurately adjusts the electrode assembly, so that the heating speed of the electrode assembly is accurately controlled, and it is ensured that food is evenly heated in the heating process.

Description

Technical Field

[0001] The present invention relates to the technical field of food heating, and in particular to a food heating device and a control method thereof. Background Art

[0002] When heating food, the prior art heats the food by using ohmic heating. During the heating process, for non-homogeneous food or solid food, uneven heating often occurs, resulting in food in some areas being burnt while food in other areas is not fully cooked. This situation not only affects the taste and nutritional value of the food, but also causes food safety issues.

[0003] The uneven heating of food is mainly caused by the uneven distribution of current inside the food during the ohmic heating process. When the conductivity of the food is uneven or the design of the electrode cannot adapt to the changes in the shape and size of the food, the current will tend to flow to the area with lower resistance, resulting in overheating of some areas and insufficient heating of other areas. In response to the above problems, the existing technology improves the problem of uneven heating of food in two ways. The first way is to adjust the voltage of the electrode to change the intensity of the electric field. However, this method can only achieve a uniform effect on the surface of the food, and the electrode cannot adapt to the volume change caused by water absorption or loss during the heating process, resulting in unstable heat transfer effect; the second way is to apply high voltage to the food in the heating device through JBT ohmic heating technology, so that the liquid food reacts as a resistor to generate heat, thereby avoiding the problems of heat loss and uneven heating in traditional heating methods, but this method can only handle liquid or liquid mixed food. Summary of the invention

[0004] The present invention provides a food heating device and a control method thereof, aiming to solve the problem that the prior art cannot well handle uneven heating of food.

[0005] An embodiment of the present invention provides a food heating device, comprising a heating box, an electrode assembly, a temperature detection assembly and a control assembly, wherein the electrode assembly and the temperature detection assembly are both connected to the control assembly, the electrode assembly is arranged inside the heating box, and the temperature detection assembly is arranged on the electrode assembly;

[0006] The temperature detection component is used to detect the temperature of the electrode assembly, and the control component controls the heating speed of the electrode assembly according to the detected temperature.

[0007] Specifically, the electrode assembly includes a first electrode assembly and a second electrode assembly, and the first electrode assembly and the second electrode assembly are respectively arranged at two ends of the heating box.

[0008] Specifically, the control component includes a control circuit, a positive electrode of the control circuit is connected to the first electrode component, and a negative electrode of the control circuit is connected to the second electrode component.

[0009] Specifically, the heating box includes a box body, a movable cover plate arranged on the top of the box body, and a fixed bottom plate arranged on the bottom of the box body. The box body has a heating space. The first electrode assembly is arranged on the side of the movable cover plate facing the heating space, and the second electrode assembly is arranged on the side of the fixed bottom plate facing the heating space.

[0010] Specifically, the first electrode assembly and the second electrode assembly each include a plurality of electrode components, the plurality of electrode components of the first electrode assembly are distributed on the movable cover plate in an array at intervals, and the plurality of electrode components of the second electrode assembly are distributed on the fixed bottom plate in an array at intervals.

[0011] Specifically, the temperature detection component includes a plurality of temperature sensing packages, and each of the electrode members is correspondingly provided with a temperature sensing package.

[0012] The embodiment of the present invention further provides a control method, which is applied to the food heating device as described above, comprising:

[0013] The temperature detection component detects the temperature of the electrode assembly;

[0014] The control component controls the heating speed of the electrode assembly according to the detected temperature.

[0015] Specifically, the control component controls the heating speed of the electrode component according to the detected temperature, including:

[0016] The control component adjusts the on-off duty cycle of the electrode component through a PWM waveform.

[0017] Specifically, the control component adjusts the on-off duty cycle of the electrode component through a PWM waveform, including:

[0018] Selecting a duty cycle reference, and controlling the on and off of the first electrode assembly and the second electrode assembly according to the duty cycle reference;

[0019] Waiting for a predetermined time, obtaining the temperature rise rate of all electrode parts;

[0020] According to the temperature rise rate, the control component adjusts the on-off duty cycle of all electrode components based on the duty cycle reference through a PWM waveform.

[0021] Specifically, the control component controls the heating speed of the electrode assembly according to the detected temperature, and further includes:

[0022] Obtaining the current temperature detected by the temperature detection component;

[0023] The current temperature is compared with a preset temperature, and the input current of the control circuit is controlled according to the comparison result.

[0024] The embodiment of the present invention provides a food heating device and a control method thereof, comprising a heating box, an electrode assembly, a temperature detection assembly and a control assembly, wherein the electrode assembly and the temperature detection assembly are both connected to the control assembly, the electrode assembly is arranged inside the heating box, and the temperature detection assembly is arranged on the electrode assembly; the temperature detection assembly is used to detect the temperature of the electrode assembly, and the control assembly controls the heating speed of the electrode assembly according to the detected temperature. In this embodiment, the temperature detection assembly monitors the electrode assembly in real time and the control assembly accurately adjusts the electrode assembly, so that the heating speed of the electrode assembly is accurately controlled to ensure that the food is heated evenly during the heating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0026] Figure 1 An exploded schematic diagram of a food heating device provided by an embodiment of the present invention;

[0027] Figure 2 A structural diagram of a food heating device provided by an embodiment of the present invention Figure 1 ;

[0028] Figure 3 A structural diagram of a food heating device provided by an embodiment of the present invention Figure 2 ;

[0029] Figure 4 A structural schematic diagram of a food heating device provided by an embodiment of the present invention;

[0030] Figure 5 A flow chart of a control method provided by an embodiment of the present invention;

[0031] Figure 6 A sub-process diagram of a control method provided by an embodiment of the present invention Figure 1 ;

[0032] Figure 7 A sub-process diagram of a control method provided by an embodiment of the present invention Figure 2 ;

[0033] Figure 8 A sub-process diagram of a control method provided by an embodiment of the present invention Figure 3 .

[0034] Description of the symbols in the figure:

[0035] 1. Heating box; 11. Box body; 12. Movable cover; 13. Fixed bottom plate; 14. Heating space;

[0036] 2. electrode assembly; 21. first electrode assembly; 211. first electrode member; 22. second electrode assembly; 221. second electrode member;

[0037] 3. Temperature detection component; 31. Temperature sensing package;

[0038] 4. Control component; 41. Control circuit. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0041] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0042] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0043] See also Figure 1-4 The embodiment of the present invention provides a food heating device, comprising a heating box 1, an electrode assembly 2, a temperature detection assembly 3 and a control assembly 4, wherein the electrode assembly 2 and the temperature detection assembly 3 are both connected to the control assembly 4, the electrode assembly 2 is arranged inside the heating box 1, and the temperature detection assembly 3 is arranged on the electrode assembly 2;

[0044] The temperature detection component 3 is used to detect the temperature of the electrode component 2, and the control component 4 controls the heating speed of the electrode component 2 according to the detected temperature.

[0045] In this embodiment, the heating box 1 is a food heating container, which is a closed and relatively heat-insulating environment. The electrode assembly 2 is arranged inside the heating box 1 and can generate heat when turned on, so that the heat can be effectively transferred to the food to achieve the heating of the food. The temperature detection component 3 is arranged on the electrode assembly 2 and can monitor the temperature information of the electrode assembly 2 in real time during the heating process. The control component 4 adjusts the heating speed of the electrode assembly 2 according to the temperature information fed back by the temperature detection component 3. This control method can ensure that the food is heated evenly during the heating process through the precise control of the temperature of the electrode assembly 2, and will not be overheated or overcooled, thereby maintaining the best taste and nutrition of the food. In this embodiment, through the real-time monitoring of the temperature detection component 3 and the precise adjustment of the control component 4, the precise control of the heating temperature can be achieved, which helps to maintain the stability and consistency of the food during the heating process and ensure that the taste and nutrition of the food are not lost. In addition, the electrode assembly 2 is directly arranged inside the heating box 1, in close contact with the food, and can quickly transfer heat to the food. The control component 4 adjusts the heating speed of the electrode assembly 2 in real time according to the temperature feedback.

[0046] Specifically, Figure 2-3 As shown, the electrode assembly 2 includes a first electrode assembly 21 and a second electrode assembly 22 , and the first electrode assembly 21 and the second electrode assembly 22 are respectively arranged at two ends of the heating box 1 .

[0047] In this embodiment, by arranging the first electrode assembly 21 and the second electrode assembly 22 at the two ends of the heating box 1, a relatively uniform electric field is formed between the first electrode assembly 21 and the second electrode assembly 22. During the heating process, it helps the current to flow evenly inside the heating box, thereby ensuring the uniform distribution of heat in the food, and can also shorten the transmission path of the current inside the heating box 1, thereby improving the heating efficiency. In addition, this design allows the heating box 1 to adapt to foods of different sizes and shapes. Since the first electrode assembly 21 and the second electrode assembly 22 are located at both ends, the distance between them can be adjusted according to the size of the food, thereby ensuring that the food is evenly heat treated during the heating process.

[0048] Specifically, Figure 4 As shown, the control component 4 includes a control circuit 41 , the positive electrode of the control circuit 41 is connected to the first electrode component 21 , and the negative electrode of the control circuit 41 is connected to the second electrode component 22 .

[0049] In this embodiment, the control circuit 41 can accurately adjust the size and direction of the input current, so as to achieve precise control of the heating process. The positive pole of the control circuit 41 is connected to the first electrode assembly 21, and the negative pole of the control circuit 41 is connected to the second electrode assembly 22, so that a shorter current path is formed inside the heating box 1: first electrode assembly 21-food-second electrode assembly 22, which helps to reduce the loss of current during the heating process and improve the heating efficiency. This connection method allows the heating device to adapt to different heating requirements and food types. Specifically, by adjusting the parameters of the control circuit 41, precise heating and temperature control of different types of food can be achieved.

[0050] Specifically, Figure 4 As shown, the heating box 1 includes a box body 11, a movable cover plate 12 arranged on the top of the box body 11, and a fixed bottom plate 13 arranged on the bottom of the box body 11. The box body 11 has a heating space 14. The first electrode assembly 21 is arranged on the side of the movable cover plate 12 facing the heating space 14, and the second electrode assembly 22 is arranged on the side of the fixed bottom plate 13 facing the heating space 14.

[0051] In this embodiment, the electrode assembly 2 is respectively arranged on the top (movable cover 12) and the bottom (fixed bottom plate 13) of the heating box 1, ensuring that the electric field distribution in the entire heating space 14 is more uniform. This design allows the current to penetrate the food and heat it evenly from top to bottom, thereby improving the heating efficiency. Among them, the design of the movable cover 12 allows the user to easily open and close the heating space 14, so as to conveniently put in or take out the food. This design not only improves the convenience of operation, but also reduces the contact of the food with the external environment during the heating process, which helps to maintain the hygiene and taste of the food. Moreover, the electrode assembly 2 is respectively arranged on the movable cover 12 and the fixed bottom plate 13, making it more convenient to clean and maintain the electrode assembly 2. The user can check, clean or replace the electrode assembly 2 separately without disassembling the entire heating box 1.

[0052] In a specific implementation, the movable cover 12 can be connected to the box body 11 by a hinge or other connecting mechanism, which ensures the structural stability of the heating box 1 during the heating process and helps prevent deformation or damage caused by the heat and pressure generated during the heating process. In addition, the present embodiment may also additionally be provided with a drive component, which can drive the movable cover 12 to move along the heating space 14 toward or away from the fixed bottom plate 13 to accommodate foods of different sizes and shapes, so that the first electrode assembly 21 is closer to the food so that the heat is completely transferred, thereby increasing the heating speed. In other embodiments, the drive assembly can also drive the first electrode assembly 21 to move toward or away from the fixed bottom plate 13 to accommodate foods of different sizes and shapes. In this case, the movable cover 12 cannot move toward the heating space 14.

[0053] Specifically, Figure 2-3 As shown, the first electrode assembly 21 and the second electrode assembly 22 each include a plurality of electrode components. The plurality of electrode components of the first electrode assembly 21 are distributed in an array on the movable cover plate 12 , and the plurality of electrode components of the second electrode assembly 22 are distributed in an array on the fixed base plate 13 .

[0054] In this embodiment, according to a preset array distribution diagram, a plurality of electrode members are processed using conductive materials (such as copper, aluminum or stainless steel, etc.) (for ease of explanation, the electrode member of the first electrode assembly 21 is the first electrode member 211, and the electrode member of the second electrode assembly 22 is the second electrode member 221), and these electrode members are fixed on the opposite side of the movable cover plate 12 and the fixed bottom plate 13 in an array spacing manner by welding, screw connection or other reliable connection methods, and ensure that the spacing between each electrode member is uniform to ensure the uniform distribution of current in the heating space. In the specific implementation, it is also necessary to insulate all electrode members to prevent current leakage or contact with other non-conductive parts, and all first electrode members 211 of the first electrode assembly 21 are connected to the positive electrode of the control circuit 41 through a wire to form a positive electrode group, and all second electrode members 221 of the second electrode assembly 22 are connected to the negative electrode of the control circuit 41 through a wire to form a negative electrode group, so as to ensure that the connection of the control circuit 41 is reliable without short circuit or open circuit.

[0055] When food needs to be heated, the movable cover 12 is opened and the food is placed in the heating space 14, and then the movable cover 12 is closed and the power is turned on. The current passes through the electric field between the first electrode assembly 21 and the second electrode assembly 22 to heat the food. In specific implementation, the number, size and spacing of the electrode components can be adjusted according to the size and shape of the food, so as to optimize the electric field strength and make it more suitable for the heating requirements of the food.

[0056] In this embodiment, the electrode members are arranged on the movable cover plate 12 and the fixed bottom plate 13 and are distributed in an array so that the current can be evenly distributed in the heating space, thereby achieving uniform heating of the food, effectively avoiding the problem of local overheating or insufficient heating, and improving the consistency of the heating effect; the array-distributed electrode members enable the current to penetrate the food more effectively, reducing energy loss. At the same time, due to the uniform spacing between the electrode members, the current flows more smoothly in the heating space, improving the heating efficiency.

[0057] Specifically, Figure 2-4 As shown, the temperature detection assembly 3 includes a plurality of temperature sensing packages 31 , and a temperature sensing package 31 is correspondingly arranged on each electrode member.

[0058] In this embodiment, multiple temperature sensing packages 31 can detect the working temperature of each electrode component in real time, which is conducive to timely discovering the temperature abnormality of a certain electrode component during the heating process. The control component 4 can control the heating speed of the specific electrode component according to the information of the temperature abnormality to prevent the food from being unevenly heated and affecting the taste due to excessively high or low temperatures in a certain area during the heating process. This setting method can flexibly adapt to the heating needs of foods of different sizes and shapes. By adjusting the number, size and spacing of electrode components and temperature sensing packages, the electric field strength distribution and temperature distribution can be optimized to meet the heating requirements of different foods.

[0059] Compared with the prior art, the embodiment of the present invention adds multiple electrode components distributed in an array, and controls the heating rate of each electrode component separately, so as to achieve a uniform heating effect under different contact conditions. In addition, the distance between the first electrode assembly 21 and the second electrode assembly 22 is adjustable, and the food can be clamped for heating, such as clamping a steak for ohmic heating. In addition, each electrode component has a separate temperature sensing package 31 for temperature detection and circuit on-off control, which is used to accurately control the power-on rate of each electrode component. At the same time, the first electrode component 211 in the first electrode assembly 21 shares the same positive electrode, and the second electrode component 221 in the second electrode assembly 22 shares the same negative electrode. It should be noted that the same cycle and phase are used for the control of all paths, and the principle of first on and then off is followed to ensure that the positive and negative electrodes that need to be turned on can work correspondingly during the on time.

[0060] like Figure 5 As shown, the embodiment of the present invention further provides a control method, which is applied to the food heating device as described above, comprising steps S10-S20:

[0061] S10, the temperature detection component 3 detects the temperature of the electrode component 2;

[0062] S20, the control component 4 controls the heating speed of the electrode component 2 according to the detected temperature.

[0063] In this step, when the food heating device is started, the temperature detection component 3 starts working immediately, the temperature detection component 3 collects the temperature data of the electrode assembly 2 in real time, and transmits the temperature data to the control component 4. After receiving the temperature data, the control component 4 immediately starts the temperature control algorithm for analysis. The algorithm compares the current temperature with the preset target temperature and the rate of temperature change to evaluate whether the heating process is in the best state. According to the evaluation results, the control component 4 sends an instruction to the electrode assembly 2 to adjust the heating speed. If the current temperature of the electrode assembly 2 is lower than the target temperature, the heating speed is increased; if the current temperature of the electrode assembly 2 is higher than the target temperature, the heating speed is reduced. When the food reaches the preset heating temperature or heating time, the control component 4 will issue an instruction to stop heating. At this time, the electrode assembly 2 stops working, and the temperature detection component 3 continues to monitor for a period of time to ensure that the food temperature is stable and safe. In this embodiment, the temperature detection component 3 and the control component 4 work together to achieve accurate control of the heating speed of the electrode assembly 2, ensure the safety and efficiency of the heating process, and the control component 4 can dynamically adjust the heating strategy according to the real-time temperature data, improve the heating efficiency and reduce energy consumption.

[0064] In one embodiment, if Figure 6 As shown, S20 includes:

[0065] S21, the control component 4 adjusts the on-off duty cycle of the electrode component 2 through a PWM waveform.

[0066] In this embodiment, the PWM waveform is a technology that uses digital signals to control analog circuits. It adjusts the average voltage or power of the output signal by changing the width (i.e., duty cycle) and / or frequency of the pulse. The duty cycle refers to the proportion of time occupied by the high level (or effective level) in a PWM cycle. By changing the duty cycle, the energy obtained by the electrode assembly 2 per unit time can be controlled, thereby adjusting its heating speed. The larger the duty cycle, the more energy the electrode assembly 2 obtains, and the faster the heating speed; the smaller the duty cycle, the less energy the electrode assembly 2 obtains, and the slower the heating speed.

[0067] In a specific implementation, the control component 4 includes a PWM generator or counter module for generating a PWM waveform with a specific frequency and duty cycle. The frequency, duty cycle and other parameters of the PWM waveform can be set by programming or configuring registers. The generated PWM signal is output to the electrode component 2 through the control circuit. The electrode component 2 performs on-off control according to the duty cycle of the PWM signal, thereby adjusting the heating speed to keep the heating speed stable and accurate.

[0068] Specifically, Figure 7 As shown, S21 includes:

[0069] S211, selecting a duty cycle reference, and controlling the on and off of the first electrode assembly 21 and the second electrode assembly 22 according to the duty cycle reference;

[0070] S212, waiting for a predetermined time and obtaining the temperature rise rate of all electrode components;

[0071] S213. According to the temperature rise rate, the control component 4 adjusts the on-off duty cycle of all electrode components based on the duty cycle reference through a PWM waveform.

[0072] In this embodiment, in S211, a suitable duty cycle reference value can be selected, and then the duty cycle reference value is applied to the PWM waveform to generate a PWM signal with the duty cycle, and the generated PWM signal is output to the control terminals of the first electrode assembly 21 and the second electrode assembly 22 respectively to control their on and off states. It should be noted that the selection of the duty cycle reference value should be determined according to the characteristics and heating requirements of the electrode assembly 2, and the frequency of the PWM signal also needs to be selected according to the specific situation to ensure the control effect and stability. Among them, the duty cycle can be adjusted between 0% and 100%, and the selected duty cycle reference value can be 50%.

[0073] In S212, after applying the duty cycle reference value, the control component 4 waits for a predetermined time to ensure that the electrode component 2 has enough time to respond and generate temperature rise, and then uses the temperature detection component 3 to obtain the temperature rise rate data of all electrode components. In specific implementation, the predetermined waiting time can be 10 minutes, or the predetermined waiting time required can be determined according to the temperature or temperature rise rate of the electrode component, which can be done in the following way:

[0074] The first method: obtaining the current temperature of all electrode components at the same moment. If there are a first predetermined number of electrode components among all electrode components whose current temperatures are greater than the temperature threshold, the temperature rise rate of all electrode components is obtained at this time. Among them, the first predetermined number can be set to 1 / 2, that is, if the number of all electrode components is 40, the first predetermined number is 20. If the current temperatures of 20 electrode components are greater than the temperature threshold, the temperature rise rate of all electrode components can be obtained at this time. In specific implementation, the first electrode assembly 21 and the second electrode assembly 22 can also be judged independently. For example, it is judged whether the current temperature of more than half of the electrode components in the first electrode assembly 21 is greater than the temperature threshold and whether the current temperature of more than half of the electrode components in the second electrode assembly 22 is greater than the temperature threshold. If the current temperature of more than half of the electrode components is greater than the temperature threshold, the temperature rise rate of all electrode components is obtained at this time.

[0075] The second method is to divide the temperature into a first temperature range, a second temperature range and a third temperature range according to the temperature size, wherein the first temperature range < the second temperature range < the third temperature range, each temperature range corresponds to a waiting time, and the larger the temperature range, the shorter the waiting time required;

[0076] Calculate the average temperature of all electrode parts at the same time, match the average temperature with all temperature ranges, obtain the corresponding waiting time according to the matching result, and obtain the temperature rise rate of all electrode parts after the time is reached.

[0077] In specific implementation, the average temperatures of the first electrode assembly 21 and the second electrode assembly 22 can be calculated separately, and the two average temperatures are matched with all temperature ranges. The two matching results are then averaged to obtain the required waiting time.

[0078] The third method: all electrode components are monitored in real time through the temperature detection component 3, and a temperature rise threshold is preset. If the temperature rise rate of the second preset number of electrode components is greater than the temperature rise threshold, the temperature rise rate of all electrode components is obtained at this time. Among them, the second preset number can be set to 1 / 3, that is, if the number of all electrode components is 30, the second preset number is 10. If the temperature rise rate of 10 electrode components is greater than the temperature rise threshold, the temperature rise rate of all electrode components can be obtained at this time. In specific implementation, the first electrode component 21 and the second electrode component 22 can also be judged independently. For example, it is judged whether more than 1 / 3 of the electrode components in the first electrode component 21 have a temperature rise rate greater than the temperature rise threshold, and whether more than 1 / 3 of the electrode components in the second electrode component 22 have a temperature rise rate greater than the temperature rise threshold. If the temperature rise rate of more than 1 / 3 of the electrode components is greater than the temperature rise threshold, the temperature rise rate of all electrode components is obtained at this time.

[0079] The fourth method is to divide the temperature rise rate into the first rate range, the second rate range and the third rate range according to the rate size, wherein the first rate range < the second rate range < the third rate range, each rate range corresponds to a waiting time, the larger the rate range, the shorter the waiting time;

[0080] The average temperature rise rate of all electrode parts at the same time is calculated, and the average temperature rise rate is matched with all rate ranges. The corresponding waiting time is obtained according to the matching result. After the time is reached, the temperature rise rate of all electrode parts is obtained.

[0081] In specific implementation, the average temperature rise rates of the first electrode assembly 21 and the second electrode assembly 22 can be calculated separately, and the two average temperature rise rates are matched with all rate ranges, and the two matching results are averaged to obtain the required waiting time.

[0082] In S213, the control component 4 analyzes the acquired temperature rise rate data, compares the difference between the actual temperature rise rate and the expected temperature rise rate, and according to the comparison result, the control component 4 dynamically adjusts the on-off duty cycle of all electrode components based on the duty cycle reference value through the PWM waveform, and re-outputs the adjusted PWM signal to the control end of each electrode component to achieve more precise heating control.

[0083] In the specific implementation, the average value of the temperature rise rate of all electrode components is calculated as the target temperature rise rate. For each electrode component, its temperature rise rate is compared with the target temperature rise rate. If the temperature rise rate of the electrode component is greater than the target temperature rise rate, it means that the heating is too fast and the on-off duty cycle needs to be reduced; if the temperature rise rate of the electrode component is lower than the target temperature rise rate, it means that the heating is too slow and the on-off duty cycle needs to be increased. Before adjusting the duty cycle, it is necessary to ensure that the highest duty cycle values ​​of the first electrode assembly 21 and the second electrode assembly 22 are consistent. This is because if the duty cycles of the first electrode assembly 21 and the second electrode assembly 22 are inconsistent, the higher duty cycle will not work. For the electrode component that needs to reduce the on-off duty cycle, the duty cycle of its PWM signal is gradually reduced until its temperature rise rate is close to the target temperature rise rate; for the plate that needs to increase the on-off duty cycle, the duty cycle of its PWM signal is gradually increased until its temperature rise rate is close to the target temperature rise rate. During the adjustment process, it is necessary to continuously monitor the temperature rise rate of each electrode component and make fine adjustments according to the actual situation to ensure that the overall temperature rise is basically consistent.

[0084] This embodiment can more accurately control the heating speed and temperature of the electrode assembly 2 by dynamically adjusting the on-off duty cycle of each electrode component, thereby improving the heating accuracy.

[0085] In one embodiment, if Figure 8 As shown, S20 also includes:

[0086] S22, obtaining the current temperature detected by the temperature detection component 3;

[0087] S23, comparing the current temperature with the preset temperature, and controlling the input current of the control circuit 41 according to the comparison result.

[0088] In this embodiment, the temperature detection component 3 detects the current temperature of the electrode component 2 in real time and transmits it to the control component 4. The control component 4 compares the read current temperature with the preset temperature. If the current temperature is lower than the preset temperature, it means that the heating power needs to be increased, and the control circuit 41 will increase the current output to the electrode component 2; if the current temperature is higher than the preset temperature, it means that the heating power is too large, and the control circuit 41 will reduce the current output to the electrode component 2.

[0089] In a specific implementation, the control circuit 41 can control the input current of the electrode assembly 2 by adjusting the duty cycle of the PWM signal or adjusting the voltage or current of the DC power supply.

[0090] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A food heating device, comprising a heating box, characterized in that: It also includes an electrode assembly, a temperature detection assembly and a control assembly, wherein the electrode assembly and the temperature detection assembly are both connected to the control assembly, the electrode assembly is arranged inside the heating box, and the temperature detection assembly is arranged on the electrode assembly; The temperature detection component is used to detect the temperature of the electrode assembly, and the control component controls the heating speed of the electrode assembly according to the detected temperature.

2. The food heating device according to claim 1, characterized in that: The electrode assembly includes a first electrode assembly and a second electrode assembly, and the first electrode assembly and the second electrode assembly are respectively arranged at two ends of the heating box.

3. The food heating device according to claim 2, characterized in that: The control component includes a control circuit, a positive electrode of the control circuit is connected to the first electrode component, and a negative electrode of the control circuit is connected to the second electrode component.

4. The food heating device according to claim 3, characterized in that: The heating box includes a box body, a movable cover plate arranged on the top of the box body, and a fixed bottom plate arranged on the bottom of the box body. The box body has a heating space. The first electrode assembly is arranged on the side of the movable cover plate facing the heating space, and the second electrode assembly is arranged on the side of the fixed bottom plate facing the heating space.

5. The food heating device according to claim 4, characterized in that: The first electrode assembly and the second electrode assembly each include a plurality of electrode components. The plurality of electrode components of the first electrode assembly are distributed on the movable cover plate in an array and at intervals, and the plurality of electrode components of the second electrode assembly are distributed on the fixed bottom plate in an array and at intervals.

6. The food heating device according to claim 5, characterized in that: The temperature detection component includes a plurality of temperature sensing packages, and each of the electrode members is correspondingly provided with a temperature sensing package.

7. A control method, applied to the food heating device according to any one of claims 1 to 6, characterized in that: include: The temperature detection component detects the temperature of the electrode assembly; The control component controls the heating speed of the electrode assembly according to the detected temperature.

8. The control method according to claim 7, characterized in that: The control component controls the heating speed of the electrode assembly according to the detected temperature, including: The control component adjusts the on-off duty cycle of the electrode component through a PWM waveform.

9. The control method according to claim 8, applied to the food heating device according to any one of claims 5-6, characterized in that: The control component adjusts the on-off duty ratio of the electrode component through a PWM waveform, including: Selecting a duty cycle reference, and controlling the on and off of the first electrode assembly and the second electrode assembly according to the duty cycle reference; Waiting for a predetermined time, obtaining the temperature rise rate of all electrode parts; According to the temperature rise rate, the control component adjusts the on-off duty cycle of all electrode components based on the duty cycle reference through a PWM waveform.

10. The control method according to claim 7, applied to the food heating device according to any one of claims 3 to 6, characterized in that: The control component controls the heating speed of the electrode assembly according to the detected temperature, and further comprises: Obtaining the current temperature detected by the temperature detection component; The current temperature is compared with a preset temperature, and the input current of the control circuit is controlled according to the comparison result.

Images