A constant power control method and system for cooking equipment

Abstract

This application discloses a constant power control method and system for cooking equipment. The method includes: acquiring the standard power value corresponding to the current operating level of the cooking equipment; collecting the current actual power in real time; calculating the power deviation between the two; if the power deviation exceeds a preset allowable error range, generating a power adjustment amount based on the power deviation; and using the power adjustment amount to correct the current power control parameters so that the actual power approaches the standard power value. The generation of the power adjustment amount adopts a piecewise proportional or fuzzy rule nonlinear mapping, and the allowable error range can be dynamically adjusted according to the working stage or temperature change rate. This application also includes soft-start and abnormal voltage protection logic. This application solves the problem in related technologies where grid voltage fluctuations cause inconsistent output power at the same level, affecting the consistency of food cooking. Through adaptive closed-loop feedback control, the impact of voltage fluctuations on equipment power is effectively reduced, ensuring the stability of output power at the same level under different voltage environments, and achieving uniform cooking temperature and consistent food output.

Description

Technical Field

[0001] This application relates to the field of power electronic control, and in particular to a constant power control method and system for a cooking device. Background Technology

[0002] In the field of power electronics control, many electrical devices are highly dependent on the stability of their input voltage. This is especially true for intelligent cooking equipment that uses electromagnetic heating, where there is a direct correlation between its output power and input voltage. Since grid voltage fluctuates depending on the electrical load, time of day, and location, maintaining stable equipment output power under fluctuating voltage conditions is a common concern in both power electronics control and intelligent device control.

[0003] The most common power control method currently is open-loop control. Equipment is calibrated to a standard voltage before leaving the factory, and fixed control parameters for each power level are determined and fixed. During use, the power output is directly called based on these parameters, without real-time adjustment of the actual power. Some devices may collect voltage or current signals, but only for overvoltage and overcurrent protection, rather than actively adjusting the power.

[0004] When the actual operating voltage differs from the factory-set voltage, the output power at the same setting will vary. Lower voltage results in insufficient heat and incomplete heating; higher voltage leads to excessive heat and a tendency to burn food. Due to continuous fluctuations in the mains voltage, the same equipment at the same setting will have different output power under different usage conditions, ultimately affecting the consistency and quality of cooked dishes. Summary of the Invention

[0005] This application provides a constant power control method and system for cooking equipment, solving the problem in related technologies where grid voltage fluctuations cause inconsistent output power at the same speed setting, affecting the consistency of food cooking. Through closed-loop feedback control, the impact of voltage fluctuations on equipment power is effectively reduced, ensuring the stability of output power at the same speed setting under different voltage environments, and achieving uniform cooking temperature and consistent food output.

[0006] This application provides a method for constant power control of a cooking device, the method comprising: Obtain the standard power value corresponding to the current operating setting of the cooking equipment; Real-time acquisition of the current actual power of the cooking equipment; Calculate the power deviation between the current actual power and the standard power value; If the power deviation exceeds the preset allowable error range, a firepower adjustment amount is generated based on the power deviation; The current fire control parameters are corrected using the fire adjustment amount so that the current actual power approaches the standard power value.

[0007] Optionally, the step of acquiring the current actual power of the cooking device in real time includes: Power data is acquired periodically according to a preset sampling period; Calculate the average power over one sampling period or multiple consecutive sampling periods as the current actual power. Optionally, the step of generating the firepower adjustment amount based on the power deviation includes: When the power deviation is positive and exceeds the allowable error range, the direction of firepower adjustment is determined to be to reduce firepower. When the power deviation is negative and exceeds the allowable error range, the direction of firepower adjustment is determined to be increasing firepower; The magnitude of the firepower adjustment is calculated based on the absolute value of the power deviation.

[0008] Optionally, calculating the magnitude of the firepower adjustment based on the absolute value of the power deviation specifically includes: The absolute value of the power deviation is compared with a set of preset deviation ranges; The magnitude of the firepower adjustment is calculated based on the preset proportional coefficient corresponding to the deviation range, wherein different deviation ranges correspond to different proportional coefficients, and the proportional coefficients increase as the deviation increases.

[0009] Optionally, the method further includes: Obtain the standard power value or the type of heating medium corresponding to the current operating level of the cooking device; The value of the preset proportional coefficient is dynamically adjusted according to the standard power value or the type of heating medium.

[0010] Optionally, the preset allowable error range is dynamically adjusted based on the current operating stage or temperature change rate of the cooking equipment: If the rate of temperature change is greater than the first threshold, it is determined to be a rapid heating stage, and the allowable error range is set as the first error value. If the rate of temperature change is less than or equal to the first threshold and greater than the second threshold, it is determined to be a stable heating stage, and the allowable error range is set as the second error value, where the second error value is less than the first error value. If the rate of temperature change is less than or equal to the second threshold, it is determined to be in the constant temperature or heat preservation stage, and the allowable error range is set as the third error value, where the third error value is less than the second error value.

[0011] Optionally, the step of correcting the current fire control parameters using the fire adjustment amount includes: Obtain the duty cycle of the pulse width modulation signal currently used to control power output; Based on the stated firepower adjustment direction, the target duty cycle is obtained by subtracting or adding the stated firepower adjustment magnitude to the current duty cycle. The duty cycle of the pulse width modulation signal is updated to the target duty cycle to adjust the output power.

[0012] Optionally, after the step of correcting the current fire control parameters using the fire adjustment amount, the method further includes: After correcting the fire control parameters using the fire adjustment amount, a delay of one control cycle is applied; After the delay ends, return to the step of collecting the current actual power of the cooking device in real time.

[0013] Optionally, before obtaining the standard power value corresponding to the current operating setting of the cooking device, the method further includes: Receive the user's gear selection command; According to the gear selection instruction, a preset power mapping table is queried to determine the standard power value that uniquely corresponds to the operating gear, and the standard power value is used as the target benchmark for subsequent power deviation calculation.

[0014] Optionally, the real-time acquisition of the current actual power of the cooking device includes: The instantaneous voltage and instantaneous current values ​​of the cooking equipment are collected simultaneously. The instantaneous power is obtained by multiplying the instantaneous voltage and instantaneous current values ​​at the same moment. The current actual power is obtained by filtering or averaging multiple instantaneous power values ​​within a preset time window.

[0015] Optionally, the method further includes a soft-start step: During the preset soft-start time after the cooking equipment is started or the gear is switched, the power control parameters are gradually increased according to the soft-start curve until the target power control parameters corresponding to the current gear are reached; during the soft-start time, the step of generating power adjustment based on power deviation is not executed.

[0016] Optionally, the method further includes an abnormal voltage protection step: Real-time acquisition of the input voltage of the cooking equipment; If the input voltage exceeds the first voltage threshold, power output is stopped and an overvoltage fault is reported. If the input voltage is lower than the second voltage threshold, the maximum output power is limited to a preset safe power value, and a voltage abnormality warning is issued. Once the input voltage recovers to the normal voltage range and the duration exceeds the preset recovery time, the abnormal protection mode is exited and the closed-loop control is restarted.

[0017] In addition, to achieve the above objectives, embodiments of the present invention also provide a constant power control system for a cooking device, the system comprising: a target acquisition module, a power acquisition module, a deviation calculation module, a judgment and adjustment module, and a parameter correction module.

[0018] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: 1. By collecting actual power in real time and comparing it with standard power, the system actively adjusts the power control parameters when the deviation exceeds the allowable range, forming a closed-loop control. Even if the grid voltage fluctuates due to factors such as peak electricity consumption and regional differences, the equipment can automatically stabilize the output power near the standard power, significantly improving the equipment's adaptability to complex power grid environments.

[0019] 2. When the voltage is too low and the power is insufficient, the heat will be automatically increased; when the voltage is too high and the power is too high, the heat will be automatically reduced. This ensures that the same power setting can output stable power under different usage conditions, avoiding the problems of insufficient heating due to insufficient heat or burning due to excessive heat, thus ensuring the consistency of food quality.

[0020] 3. The firepower adjustment is generated by nonlinear mapping using segmented proportions or fuzzy rules, which can adapt to the response characteristics of different power ranges and different heating media, avoid overshoot or oscillation that may be caused by linear control, and improve the precision and robustness of control.

[0021] 4. The allowable error range can be dynamically adjusted according to the working stage: a larger error is allowed in the heating stage for rapid response, and the error is tightened in the constant temperature stage to ensure stability, thus achieving an adaptive balance between response speed and control accuracy.

[0022] 5. The soft-start mechanism avoids power surges during startup, and the abnormal voltage protection mechanism ensures safe operation of the equipment when the power grid is abnormal, thus improving product reliability and user experience. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the constant power control method for the cooking equipment of this application; Figure 2 This is a schematic diagram of the constant power control method for the cooking equipment of this application; Figure 3 This is a schematic diagram of the constant power control system of the cooking equipment of this application; Figure 4 This is a schematic diagram of the terminal structure of the hardware operating environment involved in one embodiment of this application. Detailed Implementation

[0024] To address the problem of inconsistent actual output power of cooking equipment at the same power setting due to grid voltage fluctuations, resulting in unstable heat and poor food consistency, this application provides a constant power control method for cooking equipment. This method involves real-time acquisition of the actual power of the cooking equipment, calculation of the deviation between this deviation and the standard power value for the current power setting, and, when the deviation exceeds a preset allowable error range. The direction of heat adjustment is determined based on the sign of the power deviation, and the heat adjustment amplitude is calculated using a nonlinear mapping relationship (such as piecewise proportional, variable gain, or fuzzy rules). This adjustment amount is then used to correct the current heat control parameters, bringing the actual output power closer to the standard power value. Simultaneously, the allowable error range can be dynamically adjusted according to the operating stage or temperature change rate. A soft-start strategy is implemented during startup, and protection logic is executed under abnormal voltage conditions. Through this solution, this application effectively reduces the impact of grid voltage fluctuations on the equipment's output power, ensuring the stability of the output power at the same power setting under different voltage environments. This achieves uniform cooking temperature and consistent food quality, significantly improving the robustness and safety of the equipment.

[0025] To better understand the above technical solutions, exemplary embodiments of this application will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0026] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0027] Example 1 This embodiment provides a constant power control method for a cooking device. This method monitors the actual output power of the cooking device in real time and compares it with the standard power of the current setting. When the deviation exceeds the allowable error range, it automatically adjusts the power control parameters, thereby stabilizing the actual output power near the standard power and effectively suppressing the impact of grid voltage fluctuations on the output power of the cooking device.

[0028] Reference Figure 1 and Figure 2 The constant power control method for the cooking device in this embodiment includes the following steps: Step S1: Obtain the standard power value corresponding to the current operating setting of the cooking equipment; In this embodiment, the standard power value refers to the output power that the device should have at this level, measured under standard voltage conditions during factory commissioning. This value serves as the benchmark for subsequent power control.

[0029] As an optional implementation, during equipment operation, a user's gear selection command is received; based on the gear selection command, a preset power mapping table is queried to determine the standard power value uniquely corresponding to the operating gear, and the standard power value is used as the target benchmark for subsequent power deviation calculation.

[0030] For example, suppose a cooking appliance has 7 power levels, corresponding to 3KW, 5KW, 7KW, 9KW, 11KW, 13KW, and 15KW respectively; when the user selects level 5, the appliance queries the power mapping table to determine the standard power value as 11KW, and uses this value as the target benchmark for subsequent control.

[0031] Optionally, before step S1, after the device is powered on, initialization configuration and gear identification are required to establish the correspondence between the power control parameters and the actual output power. The maximum power control value corresponding to the maximum gear of the cooking device is obtained; based on the correspondence between the maximum power control value and the maximum output power, the power value corresponding to the unit control value is determined.

[0032] Specifically, the number of power settings of the cooking equipment and the maximum power control value corresponding to the highest power setting are obtained. The power control value refers to the driving parameters used to control power output, such as PWM duty cycle, conduction angle, or the duty cycle of the IGBT drive signal.

[0033] Based on the correspondence between the maximum power control value and the maximum output power, the unit control value is determined, thereby establishing the correspondence between the control value and the power value.

[0034] For example, suppose the maximum setting of a cooking appliance corresponds to an output power of 15KW and a corresponding PWM duty cycle of 85%. Through initialization, the power value corresponding to each control unit can be rounded to 176W. Step S2: Real-time acquisition of the current actual power of the cooking equipment; In this embodiment, the current actual power refers to the power value actually output by the device at the current moment. Since instantaneous power may fluctuate, it is usually necessary to obtain a stable and reliable power value through sampling and averaging.

[0035] Optionally, the real-time acquisition in this embodiment is not limited to continuous and uninterrupted acquisition, but refers to acquiring power values ​​according to a preset control cycle or time interval during the operation of the device, including but not limited to acquiring once at fixed intervals, acquiring based on event triggers, or taking the average value after continuous acquisition.

[0036] As an optional implementation, power data is acquired periodically at a preset sampling period; the average power value over one or more consecutive sampling periods is calculated as the current actual power. For example, if the sampling period is set to 200ms, the average power value of the most recent 5 sampling periods is calculated as the current actual power. .

[0037] As another optional implementation, the instantaneous voltage and instantaneous current values ​​of the cooking device can be collected synchronously; the instantaneous power can be obtained by multiplying the instantaneous voltage and instantaneous current values ​​at the same moment; and the current actual power can be obtained by filtering or averaging multiple instantaneous power values ​​within a preset time window.

[0038] For example, a sampling period of 100ms is set, and 10 sets of voltage and current data are collected in each sampling period to calculate 10 instantaneous power values. The arithmetic mean of these 10 instantaneous power values ​​is taken to obtain the average power within that sampling period. The average power of the most recent 3 sampling periods is then averaged again to obtain the current actual power. .

[0039] Step S3: Calculate the power deviation between the current actual power and the standard power value; Specifically, let the current actual power be... The standard power value is The power deviation is .

[0040] Step S4: If the power deviation exceeds the preset allowable error range, then generate a firepower adjustment amount based on the power deviation; In this embodiment, the firepower adjustment amount refers to the adjustment value used to correct the current firepower control parameters, and includes two pieces of information: the adjustment direction and the adjustment magnitude. In this embodiment, the firepower adjustment amount... A positive value indicates the degree of adjustment required. The allowable error range refers to the permissible range of power fluctuations, avoiding frequent adjustments due to minor fluctuations. The allowable error range can be configured according to actual needs. It can also be dynamically adjusted according to the operating stage (see Example 2 for details).

[0041] Specifically, let the allowable error value be... ,when At that time, calculate the first comparison value after subtracting the allowable error from the current actual power. ,Right now .if If so, it is determined to exceed the allowable error range. At that time, calculate the first comparison value after adding the allowable error to the current actual power. ,Right now .if If so, it is determined that the error exceeds the allowable error range.

[0042] Optionally, if the error exceeds the allowable range, a second comparison value is further calculated. That is, the difference between the first comparison value and the standard power: .according to Determine the amount of firepower adjustment needed. . It reflects the deviation that the current actual power exceeds or falls below the standard power and exceeds the allowable error range.

[0043] In this embodiment, to adapt to the response characteristics of different power ranges and different heating media, the power adjustment is generated using a nonlinear mapping relationship, rather than a simple linear proportion. Specifically: As a preferred implementation, segmented proportional control is adopted: the absolute value of the power deviation e= The system is divided into multiple intervals, each corresponding to a different scaling factor K. p .For example: If e <= 150W, then = 0 (dead zone, no adjustment); If 150W < e <= 500W, then = K p1 xe, where K p1 = 0.5; If 500W < e <= 1000W, then = K p2 xe, where K p2 = 0.8; If e > 1000W, then = Fire_{v_max} (limiting adjustment).

[0044] As another preferred embodiment, the scaling factor K p1 K p2 According to the standard power value of the current operating gear Or the heating medium type can be dynamically adjusted. For example, in the low power range ( < 7KW) uses a smaller proportional coefficient to avoid overly sensitive adjustment at low power; in the high power range ( For power supplies > 9KW, a larger proportional gain is used to speed up the response. For example, when a large temperature change rate is detected in the cookware (indicating the medium is oil or an empty pot), the proportional gain should be appropriately reduced to prevent overshoot; when the temperature change rate is small (indicating the medium is water or soup), the nominal proportional gain can be used.

[0045] As another preferred implementation, fuzzy rules can be introduced to generate the firepower adjustment amount. The power deviation e = | and the rate of change of deviation ec=de / dt≈(e 当前- e 上一次 ) / The input t (rate of change of deviation) is processed through fuzzification, fuzzy inference, and defuzzification to output the firepower adjustment amount. .For example: If e is positive and ec is positive, then For negative large (rapid and significant fire reduction); If e is negative and ec is negative, then The temperature is slightly higher (small heating). If e is zero and ec is zero, then It is zero (remains unchanged).

[0046] The aforementioned fuzzy rules can be pre-calibrated based on experiments and stored in the device.

[0047] Optionally, after calculating the firepower adjustment amount Then, make a judgment Is the value greater than the preset adjustment threshold? If it is, execute the firepower adjustment step; otherwise, maintain the current firepower control parameters unchanged to avoid power oscillations caused by minor adjustments.

[0048] Step S5: Use the firepower adjustment amount to correct the current firepower control parameters so that the current actual power approaches the standard power value.

[0049] In this embodiment, the power control parameters are driving parameters that directly control the output power of the equipment, such as the conduction angle, the duty cycle of the IGBT drive signal, the duty cycle of the PWM signal, or other forms of power control parameters. Correcting the power control parameters is the final execution stage of the closed-loop control.

[0050] As an optional implementation, the duty cycle of the pulse width modulation signal currently used to control power output is obtained. Based on the direction of fire adjustment, the current duty cycle is subtracted from or added to by the fire adjustment amount to obtain the target duty cycle; the duty cycle of the pulse width modulation signal is then updated to the target duty cycle to adjust the output power. Through this adjustment, the current actual power is brought closer to the standard power value. When the actual power is too high, the output power is reduced; when the actual power is too low, the output power is increased, thereby gradually converging the actual power to near the standard power.

[0051] Optionally, in order to form a continuously operating power closed-loop control loop, after completing one fire control parameter correction, a control cycle is delayed before returning to continue collecting actual power.

[0052] Specifically, after correcting the fire control parameters using the fire adjustment, a delay of one control cycle is applied. After the delay, the process returns to step S2 and repeats the above steps to form a continuously operating power closed-loop control circuit. For example, the control cycle is set to 500ms. After the equipment completes one fire parameter adjustment, it waits 500ms, then collects the current actual power again, calculates the deviation, and determines whether further adjustments are needed. In this way, the equipment can continuously monitor and maintain stable output power throughout the entire operation.

[0053] In this embodiment, through the above-mentioned segmented proportional control and medium adaptive adjustment, a small proportional coefficient is used when there is a small deviation to avoid power oscillation; a large proportional coefficient is used when there is a large deviation to ensure rapid response; at the same time, the control parameters are dynamically adjusted according to the heating medium type so that stable power output can be obtained in different cooking scenarios.

[0054] Example 2 This embodiment, based on Embodiment 1, further defines the dynamic adjustment strategy for the allowable error range Pε. At different operating stages, the device's power stability requirements vary, and using a fixed allowable error range may not simultaneously guarantee response speed and steady-state accuracy. Therefore, this embodiment proposes adaptively adjusting the allowable error range based on the temperature change rate or the operating stage.

[0055] Specifically, the equipment collects the cookware temperature T in real time using a temperature sensor (such as a thermistor at the bottom of the cookware or an infrared sensor) and calculates the temperature change rate dT / dt. Based on the magnitude of dT / dt, the current working stage is divided into the following three types: Rapid heating phase: dT / dt > 3℃ / s. This phase typically corresponds to the initial stir-frying or rapid heating in cooking, where users expect sufficient heat and rapid temperature rise. The allowable error range can be appropriately widened, and frequent adjustments should be avoided to prioritize response speed. Let Pε = x 0.12, and the lower limit of absolute error is 500W.

[0056] Stable heating phase: 0.5℃ / s < dT / dt < 3℃ / s. This phase represents the normal cooking process, requiring a balance between stability and response speed. Let Pε = x 0.05, and the lower limit of absolute error is 300W.

[0057] Constant temperature / heat preservation stage: dT / dt < 0.5℃ / s. This stage typically corresponds to the later stages of stewing, heat preservation, or sauce reduction, and requires the highest power stability to avoid temperature fluctuations affecting the taste of the dish. Let Pε = x 0.03, and the lower limit of absolute error is 200W.

[0058] In addition, if the current gear corresponds to a power Smaller (e.g.) (<7000W) To avoid excessively frequent adjustments in the low-power range, the lower limit of absolute error can be further increased to 250W or 300W.

[0059] The aforementioned thresholds and percentages can be calibrated experimentally based on the heating characteristics of different devices. By dynamically adjusting the allowable error range, this embodiment achieves an adaptive balance between response speed and control accuracy.

[0060] This embodiment dynamically adjusts the allowable error range based on the rate of temperature change, prioritizing response speed during the rapid heating phase and steady-state accuracy during the constant temperature phase. This achieves adaptive switching of control strategies under different operating stages, balancing heating speed and temperature stability.

[0061] Example 3 This embodiment adds soft-start and abnormal voltage protection logic to the first or second embodiment to improve device safety and user experience.

[0062] Soft boot strategy: The preset soft-start time T after the cooking device is started (first heating after power-on) or after the user switches gears. soft Within a second (e.g., 1 second), instead of directly executing the closed-loop adjustment steps in Example 1 (i.e., not adjusting the fire control parameters according to the power deviation), the fire control parameters are gradually increased according to the preset soft-start curve until the target fire control parameters corresponding to the current gear are reached.

[0063] As an optional implementation, the soft-start curve is a linear rising curve: the PWM duty cycle increases linearly from 0 to 60% of the target duty cycle, and the power of the current gear is stably output, taking a time T. soft1 =0.5 seconds; then it approaches the target duty cycle exponentially, taking time T. soft2 =0.5 seconds. Soft start avoids the thermal shock to the heating element, power grid, and cookware caused by sudden power changes during startup.

[0064] After the soft start time ends, the device automatically enters the normal closed-loop control mode and begins to execute the steps described in Example 1.

[0065] Abnormal voltage protection logic: The device acquires the input voltage U in real time through a voltage sampling circuit. in And compare it with a preset security threshold: Overvoltage protection: If U in > U ov (e.g., U) ovIf the voltage exceeds 450V, the power output will immediately stop (PWM duty cycle set to 0), and an overvoltage fault code will be reported, alerting the user via the display screen or buzzer. The device will remain in standby mode until the voltage returns to normal and the user restarts the device or the device automatically resets.

[0066] Undervoltage protection: If U in < U uv (e.g., U) uv =330V), then the maximum output power is limited to not exceeding P. limit (For example, 12KW), and simultaneously issue a voltage abnormality warning every 5 seconds (such as a short buzzer or screen flashing). If the current target power is higher than P limit If this is not the case, the fire control parameters will be automatically limited to the corresponding upper limit value. In undervoltage protection mode, closed-loop control still operates, but the reference target value is clamped.

[0067] Voltage recovery logic: When the input voltage recovers from an abnormal state (overvoltage or undervoltage) to the normal voltage range (e.g., 340V < U), in < 440V) and duration exceeding T recover After (e.g., 2 seconds), the device automatically exits the abnormal protection mode. If the device was in an overvoltage shutdown state before exiting, the soft start procedure is re-executed, and then closed-loop control is entered again; if the device was in an undervoltage power limiting state before exiting, it is gradually restored to the target power corresponding to the current gear (e.g., increasing the duty cycle by 5% every 100ms) to avoid sudden power changes.

[0068] Through the above protection logic, the equipment can ensure its own safety when the power grid is abnormal, and smoothly return to normal operation after the voltage is restored.

[0069] This embodiment avoids the impact of power surges on equipment and the power grid through soft start, ensures the safety of equipment during power grid fluctuations through abnormal voltage protection, and smoothly returns to normal operation after voltage recovery, significantly improving the safety of the equipment.

[0070] Example 4 This embodiment provides a constant power control system for a cooking appliance, which can be used to implement the method embodiment described above. (Refer to...) Figure 3 The system includes: Target acquisition module: This module obtains the standard power value corresponding to the current operating setting of the cooking equipment. It receives the user's setting selection command, queries a preset power mapping table, and outputs the standard power value. .

[0071] Power acquisition module: Used to acquire the current actual power of the cooking equipment in real time. This module includes a voltage detection circuit, a current detection circuit, and a signal processing unit, and outputs the current actual power P. act .

[0072] Deviation calculation module: used to calculate the power deviation between the current actual power and the standard power value, outputting e = P act - .

[0073] Judgment and Adjustment Module: Used to generate a firepower adjustment amount based on the power deviation if the power deviation exceeds a preset allowable error range. This module further includes a dynamic allowable error adjustment submodule (adjusting according to the temperature change rate). ), deviation interval judgment submodule, proportional coefficient query submodule (can be based on (or dynamic adjustment of medium type), and a submodule for calculating firepower adjustment.

[0074] Parameter correction module: This module corrects the current fire control parameters using the fire adjustment amount, so that the current actual power approaches the standard power value. This module outputs an updated PWM duty cycle or other drive signals.

[0075] In addition, the system may also include a soft-start control module and an abnormal voltage protection module, which are used to implement the functions described in Embodiment 3, respectively.

[0076] Alternatively, the functions of the above modules can be integrated into a single microcontroller, or multiple discrete components can work together.

[0077] Through the coordinated operation of the above modules, the system continuously monitors and adjusts the output power during equipment operation, forming an adaptive closed-loop control that keeps the actual output power stable near the standard power and ensures safety and stability under various operating conditions.

[0078] Example 5 In this application embodiment, a constant power control device for a cooking appliance is proposed.

[0079] Reference Figure 4 , Figure 4 This is a schematic diagram of the terminal structure of the hardware operating environment involved in one embodiment of this application.

[0080] like Figure 4As shown, the control terminal may include: a processor 1001, such as a CPU, a network interface 1003, a memory 1004, and a communication bus 1002. The communication bus 1002 is used to enable communication between these components. The network interface 1003 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1004 may be high-speed RAM or stable non-volatile memory, such as disk storage. Alternatively, the memory 1004 may be a storage device independent of the aforementioned processor 1001.

[0081] Those skilled in the art will understand that Figure 4 The terminal structure shown does not constitute a limitation on the terminal and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0082] like Figure 4 As shown, the memory 1004, which serves as a computer storage medium, may include an operating system, a network communication module, and a constant power control program for the cooking device.

[0083] exist Figure 4 In the constant power control device hardware structure of the cooking equipment shown, the processor 1001 can call the constant power control program of the cooking equipment stored in the memory 1004 and execute the operations in the above method embodiment, which will not be repeated here.

[0084] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0085] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0086] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0087] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0088] It should be noted that any reference signs placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. This application can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, third, etc., does not indicate any order. These words can be interpreted as names.

[0089] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0090] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. A constant power control method for a cooking device, characterized in that, The method includes: Obtain the standard power value corresponding to the current operating setting of the cooking equipment; Real-time acquisition of the current actual power of the cooking equipment; Calculate the power deviation between the current actual power and the standard power value; If the power deviation exceeds the preset allowable error range, a firepower adjustment amount is generated based on the power deviation; The current fire control parameters are corrected using the fire adjustment amount so that the current actual power approaches the standard power value.

2. The method as described in claim 1, characterized in that, The step of collecting the current actual power of the cooking equipment in real time includes: Power data is acquired periodically according to a preset sampling period; Calculate the average power over one sampling period or multiple consecutive sampling periods as the current actual power.

3. The method as described in claim 1, characterized in that, The step of generating the firepower adjustment amount based on the power deviation includes: When the power deviation is positive and exceeds the allowable error range, the direction of firepower adjustment is determined to be to reduce firepower. When the power deviation is negative and exceeds the allowable error range, the direction of firepower adjustment is determined to be increasing firepower; The magnitude of the firepower adjustment is calculated based on the absolute value of the power deviation.

4. The method as described in claim 3, characterized in that, The calculation of the firepower adjustment range based on the absolute value of the power deviation specifically includes: The absolute value of the power deviation is compared with a set of preset deviation ranges; The magnitude of the firepower adjustment is calculated based on the preset proportional coefficient corresponding to the deviation range, wherein different deviation ranges correspond to different proportional coefficients, and the proportional coefficients increase as the deviation increases.

5. The method as described in claim 4, characterized in that, The method further includes: Obtain the standard power value or the type of heating medium corresponding to the current operating level of the cooking device; The value of the preset proportional coefficient is dynamically adjusted according to the standard power value or the type of heating medium.

6. The method as described in claim 1, characterized in that, The preset allowable error range is dynamically adjusted based on the current operating stage or temperature change rate of the cooking equipment. If the rate of temperature change is greater than the first threshold, it is determined to be a rapid heating stage, and the allowable error range is set as the first error value. If the rate of temperature change is less than or equal to the first threshold and greater than the second threshold, it is determined to be a stable heating stage, and the allowable error range is set as the second error value, where the second error value is less than the first error value. If the rate of temperature change is less than or equal to the second threshold, it is determined to be in the constant temperature or heat preservation stage, and the allowable error range is set as the third error value, where the third error value is less than the second error value.

7. The method as described in claim 1, characterized in that, The step of correcting the current fire control parameters using the fire adjustment amount includes: Obtain the duty cycle of the pulse width modulation signal currently used to control power output; Based on the stated firepower adjustment direction, the target duty cycle is obtained by subtracting or adding the stated firepower adjustment magnitude to the current duty cycle. The duty cycle of the pulse width modulation signal is updated to the target duty cycle to adjust the output power.

8. The method as described in claim 7, characterized in that, After the step of correcting the current fire control parameters using the fire adjustment amount, the method further includes: After correcting the fire control parameters using the fire adjustment amount, a delay of one control cycle is applied; After the delay ends, return to the step of collecting the current actual power of the cooking device in real time.

9. The method as described in claim 1, characterized in that, Before obtaining the standard power value corresponding to the current operating level of the cooking device, the method further includes: Receive the user's gear selection command; According to the gear selection instruction, a preset power mapping table is queried to determine the standard power value that uniquely corresponds to the operating gear, and the standard power value is used as the target benchmark for subsequent power deviation calculation.

10. The method as described in claim 1, characterized in that, The real-time acquisition of the current actual power of the cooking equipment includes: The instantaneous voltage and instantaneous current values ​​of the cooking equipment are collected simultaneously. The instantaneous power is obtained by multiplying the instantaneous voltage and instantaneous current values ​​at the same moment. The current actual power is obtained by filtering or averaging multiple instantaneous power values ​​within a preset time window.

11. The method as described in claim 1, characterized in that, The method also includes a soft-boot step: During the preset soft-start time after the cooking equipment is started or the gear is switched, the power control parameters are gradually increased according to the soft-start curve until the target power control parameters corresponding to the current gear are reached; during the soft-start time, the step of generating power adjustment based on power deviation is not executed.

12. The method as described in claim 1, characterized in that, The method also includes an abnormal voltage protection step: Real-time acquisition of the input voltage of the cooking equipment; If the input voltage exceeds the first voltage threshold, power output is stopped and an overvoltage fault is reported. If the input voltage is lower than the second voltage threshold, the maximum output power is limited to a preset safe power value, and a voltage abnormality warning is issued. Once the input voltage recovers to the normal voltage range and the duration exceeds the preset recovery time, the abnormal protection mode is exited and the closed-loop control is restarted.

13. A constant power control system for a cooking appliance, characterized in that, The system includes: The target acquisition module is used to acquire the standard power value corresponding to the current operating setting of the cooking equipment; A power acquisition module is used to acquire the current actual power of the cooking equipment in real time; The deviation calculation module is used to calculate the power deviation between the current actual power and the standard power value; The judgment and adjustment module is used to generate a firepower adjustment amount based on the power deviation if the power deviation exceeds a preset allowable error range; The parameter correction module is used to correct the current fire control parameters using the fire adjustment amount, so that the current actual power approaches the standard power value.

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