Power control method, device and equipment of multi-head electromagnetic oven and storage medium

Abstract

The present application relates to the technical field of electromagnetic oven power control, and particularly relates to a power control method, device and equipment of a multi-head electromagnetic oven and a storage medium; the method fuses pan cover recognition and phase shift angle control, realizes objective determination of the pan cover state through resonance current information, combines hardware parameter calculation and corrects the phase shift angle, finally realizes dynamic closed-loop adjustment of power through a PID algorithm, adapts various working modes of the multi-head electromagnetic oven, and can determine a working heating unit and a corresponding working mode according to an actual cover state of the pan; the method discards defects of a resonance network design, large switching loss and serious electromagnetic interference caused by traditional frequency modulation power control of the multi-head electromagnetic oven, can effectively compensate for power control errors caused by production process deviation, guarantees consistency and constancy of output power of multiple heating units, avoids problems of local overheating or uneven heating of cookware, reduces switching loss, and improves working stability and service life of the multi-head electromagnetic oven.

Description

Technical Field

[0001] This invention relates to the field of power control technology for induction cookers, and in particular to a power control method, device, equipment, and storage medium for a multi-burner induction cooker. Background Technology

[0002] Traditional single-burner induction cookers cannot meet the needs of cooking multiple pots and pans simultaneously or heating specially shaped cookware evenly. Multi-burner induction cookers with multiple heating units and flexible combination of heating areas have become the development direction of the kitchen appliance industry.

[0003] Existing multi-burner induction cookers have many technical shortcomings in practical applications: Firstly, power control often uses frequency modulation, which leads to complex resonant network design, large switching losses, and severe electromagnetic interference (EMI), making it impossible to achieve smooth regulation over a wide power range. Secondly, when multiple heating units are bridged for heating, there is a lack of precise power balancing strategies, resulting in inconsistent output power of each unit and a tendency for localized overheating and uneven heating. Third, there is a lack of compensation measures for deviations in the production process of multiple units. Inconsistencies in the fixed switching frequency due to process deviations lead to deviations in the phase shift angle calculation, which further affects power consistency.

[0004] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention aims to provide a power control method for a multi-burner induction cooker. It constructs a fully closed-loop power control process from receiving user commands to dynamic power adjustment under a fixed-frequency phase-shift control framework, thus eliminating the technical defects of traditional multi-burner induction cooker frequency modulation power control, such as complex resonant network design, large switching losses, and severe electromagnetic interference.

[0006] The first aspect of this invention provides a power control method for a multi-heater induction cooker. The multi-heater induction cooker to which the method is applicable includes N independent heating units, where N ≥ 2 and is an even number. The method includes: acquiring a user-set total heating power and acquiring resonant current information for each heating unit; determining cookware coverage information based on the resonant current information and determining work-to-be-executed information based on the cookware coverage information, wherein the work-to-be-executed information includes a working mode, the number and quantity of the heating units to be executed; acquiring a DC bus voltage and determining a base phase shift angle for each heating unit to be executed based on the number of heating units to be executed, the DC bus voltage, and the total heating power; acquiring design information for each heating unit to be executed and correcting the base phase shift angle based on the design information to obtain a corrected phase shift angle; activating the corresponding heating unit to be executed based on each corrected phase shift angle and calculating the actual power of each activated heating unit; and adjusting the output power of each activated heating unit to be executed using a PID algorithm based on the actual power.

[0007] Optionally, in a first implementation of the first aspect of the present invention, determining the cookware coverage information based on the resonant current information and determining the work information to be performed based on the cookware coverage information includes: retrieving a preset cookware current threshold; comparing the resonant current information with the preset cookware current threshold to determine whether there is a cookware above each heating unit; if the number of heating units with cookware is one, then the heating unit is determined as the heating unit to be worked, and the working mode is determined to be a single-point heating mode; if the number of heating units with cookware is greater than one, then comparing the resonant current information of each heating unit to determine whether there is a case where the same cookware covers across areas; if it is determined that the same cookware covers across areas, then the working mode is determined to be a bridging heating mode, and the number of the heating unit to be worked is determined based on the area covered by the same cookware.

[0008] Optionally, in a second implementation of the first aspect of the present invention, obtaining the DC bus voltage and determining the basic phase shift angle of each heating unit based on the number of heating units to be operated, the DC bus voltage, and the total heating power includes: equally distributing the total heating power to each heating unit to be operated, calculating the target power corresponding to each heating unit to be operated; retrieving a pre-constructed mathematical model, the mathematical model including the mapping relationship between the phase shift angle and the power; and performing an inverse operation on the mathematical model in combination with the DC bus voltage and the target power to obtain the basic phase shift angle of each heating unit to be operated.

[0009] Optionally, in a third implementation of the first aspect of the present invention, the step of obtaining the design information of each heating unit to be operated and correcting the base phase shift angle based on the design information to obtain the corrected phase shift angle includes: obtaining the design information of each heating unit to be operated, wherein the design information includes a reference switching frequency; obtaining the actual switching frequency of each heating unit to be operated, calculating the frequency deviation value between the actual switching frequency and the reference switching frequency, and calculating a frequency compensation coefficient based on the frequency deviation value; and multiplying the frequency compensation coefficient by the base phase shift angle to obtain the corrected phase shift angle.

[0010] Optionally, in a fourth implementation of the first aspect of the present invention, the step of activating the corresponding heating unit to be operated based on each of the modified phase shift angles and calculating the actual power of each activated heating unit to be operated includes: converting each of the modified phase shift angles into a modified phase shift time, and generating a corresponding complementary PWM signal based on the modified phase shift time; sending the complementary PWM signal to the corresponding heating unit to be operated to activate each heating unit to operate according to the power corresponding to the modified phase shift angle; acquiring the real-time resonant current of the activated heating unit to be operated, and calculating the actual power of each activated heating unit to be operated based on the real-time resonant current.

[0011] Optionally, in a fifth implementation of the first aspect of the present invention, the step of adjusting the output power of each activated heating unit based on the actual power using a PID algorithm includes: calculating the power error between the target power and the actual power of each activated heating unit to obtain a power error value; obtaining a preset power error threshold, comparing the power error value with the power error threshold to determine whether there is a heating unit whose power error value exceeds the power error threshold; if not, inputting the power error value into the main PID controller, calculating the phase shift angle fine-tuning amount through proportional, integral, and derivative operations; superimposing the phase shift angle fine-tuning amount with the corresponding corrected phase shift angle to obtain the total phase shift angle; converting the total phase shift angle into an update phase shift time, generating a corresponding update complementary PWM signal based on the update phase shift time, and adjusting the output power of each activated heating unit to be operated based on the update complementary PWM signal.

[0012] Optionally, in the sixth implementation of the first aspect of the present invention, after determining whether there is a heating unit with a power error value exceeding the power error threshold, the method further includes: if there is, calculating the deviation between the power error value and the power error threshold; inputting the power error value into the main PID controller, and calculating the phase shift angle fine-tuning amount through proportional, integral, and derivative operations; inputting the deviation amount into the equalization compensation PID controller, and calculating the additional fine-tuning amount through proportional, integral, and derivative operations; superimposing the phase shift angle fine-tuning amount, the additional fine-tuning amount, and the corresponding corrected phase shift angle to obtain the total phase shift angle; converting the total phase shift angle into an update phase shift time, generating a corresponding update complementary PWM signal based on the update phase shift time, and adjusting the output power of each activated heating unit to be operated based on the update complementary PWM signal.

[0013] A second aspect of the present invention provides a power control device for a multi-heater induction cooker, comprising: an acquisition module for acquiring a total heating power set by a user and acquiring resonant current information of each heating unit; a determination module for determining cookware coverage information based on the resonant current information and determining work information to be performed based on the cookware coverage information, wherein the work information to be performed includes a working mode, the number and quantity of the heating units to be performed; a calculation module for acquiring a DC bus voltage and determining a base phase shift angle for each heating unit to be performed based on the number of heating units to be performed, the DC bus voltage and the total heating power; a correction module for acquiring design information of each heating unit to be performed and correcting the base phase shift angle based on the design information to obtain a corrected phase shift angle; an activation module for activating the corresponding heating unit to be performed based on each corrected phase shift angle and calculating the actual power of each activated heating unit to be performed; and an adjustment module for adjusting the output power of each activated heating unit to be performed using a PID algorithm based on the actual power.

[0014] A third aspect of the present invention provides a power control device for a multi-burner induction cooker, the power control device comprising: a memory and at least one processor, the memory storing instructions; the at least one processor calling the instructions in the memory to cause the power control device of the multi-burner induction cooker to execute the various steps of the power control method of the multi-burner induction cooker described in any of the preceding claims.

[0015] A fourth aspect of the present invention provides a computer-readable storage medium storing instructions that, when executed by a processor, implement the steps of the power control method for the multi-burner induction cooker described in any of the preceding claims.

[0016] The technical solution of this invention integrates cookware coverage recognition with phase shift angle control. It achieves objective determination of the cookware coverage state through resonant current information, calculates and corrects the phase shift angle based on hardware parameters, and finally uses a PID algorithm to achieve dynamic closed-loop power adjustment. This adapts to various working modes of multi-burner induction cookers, determining the heating unit to be used and its corresponding working mode based on the actual cookware coverage. This method overcomes the shortcomings of traditional multi-burner induction cooker frequency modulation power control, such as complex resonant network design, high switching losses, and severe electromagnetic interference. It effectively compensates for power control errors caused by manufacturing process deviations, ensuring the consistency and constancy of output power from multiple heating units, avoiding localized overheating or uneven heating of the cookware, while reducing switching losses and improving the working stability and service life of the multi-burner induction cooker. Attached Figure Description

[0017] Figure 1 A logic flowchart of a power control method for a multi-burner induction cooker provided in an embodiment of the present invention; Figure 2 A schematic diagram of the power control device for a multi-burner induction cooker provided in an embodiment of the present invention; Figure 3 A schematic diagram of the power control device for a multi-head induction cooker provided in an embodiment of the present invention; Detailed Implementation This invention provides a power control method, apparatus, device, and storage medium for a multi-burner induction cooker. In this invention, the terms "first," "second," "third," "fourth," etc. (if present)," in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms "comprising" or "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0018] This invention discloses a power control method for a multi-burner induction cooker. The multi-burner induction cooker is equipped with N independent heating units, where N is an even number ≥ 2. Each heating unit is modularly designed and equipped with a complete H-type full-bridge resonant inverter circuit, a resonant current detection module, a drive module, and a heating coil. The full-bridge resonant inverter circuit is existing technology and includes an insulated-gate bipolar transistor, an isolation drive circuit, and an LC resonant network. The power output and signal detection of each heating unit do not interfere with each other. The multi-head induction cooker is also equipped with a main controller, which is electrically connected to the resonant current detection module and drive module of each heating unit, and can realize real-time synchronous acquisition of resonant current and DC bus voltage and accurate calculation of phase shift angle. The multi-head induction cooker is equipped with a DC bus voltage detection module to collect the real-time voltage value of the DC bus of the whole machine; each heating unit's insulated gate bipolar transistor heat sink and heating coil are equipped with a temperature detection module to realize over-temperature protection and heat dissipation control. Meanwhile, the multi-head induction cooker is equipped with a user interaction module electrically connected to the main controller, which is used to receive user commands such as total heating power and timer, as well as provide real-time feedback on the induction cooker's working mode and the working status of the heating unit.

[0019] For ease of understanding, the specific process of the embodiments of the present invention is described below. Please refer to [link / reference]. Figure 1 One embodiment of the power control method for a multi-burner induction cooker in this invention includes: 101. Obtain the total heating power set by the user and obtain the resonant current information of each heating unit; In this embodiment, the total heating power command input by the user is received through the user interaction module and transmitted to the main controller. The main controller triggers the resonant current detection module of each heating unit to synchronously collect the original data of the resonant current at the coil of all heating units, providing objective and original detection data for subsequent cookware coverage identification.

[0020] 102. Determine the cookware coverage information based on the resonant current information, and determine the work information to be performed based on the cookware coverage information. The work information to be performed includes the working mode, the number and quantity of the heating unit to be worked. In this embodiment, the main controller analyzes and processes the collected resonant current information, and determines whether there are cookwares above each heating unit and whether the cookwares cover the area across regions based on the resonant current information, so as to determine the working mode. This realizes intelligent recognition of cookware coverage and automatic matching of working modes, improves the intelligence level of the multi-head induction cooker, and can adapt to the heating needs of cookwares of different sizes and shapes, ensuring that the heating area is compatible with the cookwares.

[0021] 103. Obtain the DC bus voltage, and determine the basic phase shift angle of each heating unit based on the number of heating units to be operated, the DC bus voltage, and the total heating power; In this embodiment, the main controller triggers the DC bus voltage detection module to collect the real-time DC bus voltage of the whole machine. Combined with the determined number of heating units to be operated and the total heating power set by the user, the basic phase shift angle for each heating unit to achieve the target power output is obtained through calculation using a pre-built mathematical model. This realizes the quantitative calculation of the phase shift angle, provides a basic phase adjustment reference for subsequent power control, and ensures the balance of power distribution among multiple units.

[0022] 104. Obtain the design information of each heating unit to be operated, and correct the basic phase shift angle based on the design information to obtain the corrected phase shift angle; In this embodiment, the preset design information of each heating unit to be operated is obtained, and the calculated basic phase shift angle is specifically corrected in combination with the actual hardware parameter deviation of the heating unit. This results in a corrected phase shift angle that is adapted to the actual hardware state of each heating unit, effectively compensating for the hardware parameter deviation of the heating unit caused by the manufacturing process, avoiding phase shift angle control errors caused by hardware inconsistency, and ensuring the consistency of power output of each heating unit under the same control logic.

[0023] 105. Activate the corresponding heating unit to be worked based on each of the aforementioned corrected phase shift angles, and calculate the actual power of each activated heating unit to be worked; In this embodiment, the main controller converts the corrected phase shift angle of each heating unit to be operated into the corresponding drive signal parameter, generates a drive signal and sends it to the drive module of each heating unit to be operated, activates the heating unit to output power according to the power corresponding to the corrected phase shift angle, and simultaneously collects the resonant current of each activated heating unit in real time, calculates the actual output power of each unit, realizes real-time monitoring of actual power, provides real power feedback data for subsequent dynamic power adjustment, ensures the closed-loop nature of power control from setting to execution, and timely captures the actual deviation of power output.

[0024] 106. Based on the actual power, the output power of each activated heating unit to be operated is adjusted using a PID algorithm; In this embodiment, the actual power of each activated heating unit is compared with the target power to obtain a power deviation value. The power deviation value is then input into a PID algorithm for calculation to obtain the phase shift angle adjustment. By adjusting the phase shift angle, the output power of each heating unit is dynamically corrected, so as to quickly and accurately compensate for the power deviation caused by grid voltage fluctuations and load characteristic changes, ensure the constant output power of each heating unit, avoid poor heating effect caused by power drift, and improve the power control stability of the multi-head induction cooker.

[0025] The power control method for a multi-burner induction cooker disclosed in this application integrates cookware coverage recognition with phase shift angle control. It objectively determines the cookware coverage state through resonant current information, calculates and corrects the phase shift angle based on hardware parameters, and finally uses a PID algorithm to achieve dynamic closed-loop power adjustment. This method adapts to various operating modes of the multi-burner induction cooker and can determine the heating unit to be used and its corresponding operating mode based on the actual cookware coverage. This method overcomes the shortcomings of traditional multi-burner induction cooker frequency modulation power control, such as complex resonant network design, high switching losses, and severe electromagnetic interference. It effectively compensates for power control errors caused by manufacturing process deviations, ensures the consistency and constantness of the output power of multiple heating units, avoids problems such as localized overheating or uneven heating of the cookware, and reduces switching losses, thereby improving the working stability and service life of the multi-burner induction cooker.

[0026] Further, in this embodiment of the invention, determining the cookware coverage information based on the resonant current information and determining the work information to be performed based on the cookware coverage information includes: 201. Retrieve the preset pot current threshold, and determine whether there is a pot above each heating unit by comparing the resonant current information with the preset pot current threshold. In this embodiment, the pre-calibrated and stored pot-containing current threshold is retrieved. The pot-containing current threshold is the minimum effective value of the resonant current when there is a metal pot above the heating unit. The main controller compares the effective value of the resonant current collected by each heating unit with the pot-containing current threshold one by one. If the effective value of the resonant current of a certain heating unit is greater than or equal to the pot-containing current threshold, it is determined that there is a pot above the heating unit; otherwise, it is determined that there is no pot.

[0027] 202. If a cookware has only one heating unit, then that heating unit is determined to be the heating unit to be used, and the working mode is determined to be single-point heating mode. In this embodiment, the number of heating units that are determined to have a pot is counted. If the count result is one, the number of that heating unit is marked as a heating unit to be worked. At the same time, the working mode of the induction cooker is set to single-point heating mode to realize the automatic triggering of single-point heating mode, which is suitable for cooking needs of heating a small area of ​​a single pot, avoiding the start of meaningless heating units, reducing system energy consumption, and clearly identifying the number of a single heating unit to be worked to ensure the targeted power control in the future.

[0028] 203. If the number of heating units in a cookware is greater than 1, compare the resonant current information of each heating unit to determine whether the same cookware covers multiple areas. In this embodiment, if the number of heating units with a pot is greater than 1, the effective value of the resonant current and phase information of each heating unit with a pot are extracted. The main controller calculates the relative deviation of the effective value of the resonant current and the absolute value of the phase difference between each heating unit, and compares them with the preset amplitude deviation range and the preset phase deviation range respectively. The preset amplitude deviation range is ≤5% for the relative deviation of the effective value of the resonant current of each heating unit. This value is obtained by experimental calibration and is the maximum allowable deviation ratio of the current of each unit when the same pot covers multiple areas. The preset phase deviation range is ≤10° for the absolute value of the phase difference of the resonant current of each heating unit. This value is the maximum allowable deviation angle of the phase of the current of each unit when the same pot covers multiple areas. If the current parameters of all heating units with pots are within the amplitude deviation range and the phase deviation range, it is determined that the same pot covers multiple areas. Otherwise, it is determined that multiple pots are placed separately. This realizes the distinction between the same pot covering multiple areas and multiple pots placed separately, avoids the working mode error caused by misjudgment, ensures the matching of the heating mode with the actual cooking scenario, and provides an accurate basis for the subsequent bridging heating mode activation.

[0029] 204. If it is determined that the same cookware covers multiple areas, the working mode will be set to bridge heating mode, and the number of the heating unit to be worked will be determined based on the area covered by the same cookware. In this embodiment, if the main controller determines that the same cookware covers multiple areas, the working mode of the multi-head induction cooker is set to bridged heating mode. At the same time, all heating units covered by the cookware and determined to have a cookware are marked as heating units to be used. The bridged heating mode and the heating unit numbers to be used are stored in the temporary data area to provide a basis for subsequent power allocation. If it is determined that multiple cookwares are placed separately, each heating unit with a cookware adopts a single-point heating mode. Each heating unit with a cookware is an independent heating unit to be used, and each unit controls its power independently according to the single-point heating mode. Taking a four-burner induction cooker as an example, its heating units are numbered 1234 clockwise. If the cookware covers units 1 and 2 simultaneously, and the current parameters of both units are within the preset deviation range, it is determined to be in bridging heating mode 12, and the heating units to be used are 1 and 2. If the cookware covers units 2 and 3 simultaneously, it is determined to be in bridging heating mode 23, and the heating units to be used are 2 and 3. If the cookware covers units 3 and 4 simultaneously, it is determined to be in bridging heating mode 34, and the heating units to be used are 3 and 4. If the cookware covers units 1 and 4 simultaneously, it is determined to be in bridging heating mode 14, and the heating units to be used are 1 and 4. If the cookware covers units 1234 simultaneously, it is determined to be in four-unit bridging heating mode, and the heating units to be used are 1234. The bridging heating mode can adapt to the uniform heating needs of special-shaped or large-sized cookware such as long baking pans and large soup pots, improving the applicability of multi-burner induction cookers.

[0030] Further, in this embodiment of the invention, obtaining the DC bus voltage and determining the basic phase shift angle of each heating unit based on the number of heating units to be operated, the DC bus voltage, and the total heating power includes: 301. Distribute the total heating power equally to each heating unit to be worked, and calculate the target power corresponding to each heating unit to be worked; In this embodiment, the predetermined number of heating units to be operated and the total heating power set by the user are retrieved, and the total heating power is evenly distributed to each heating unit to be operated through a division operation. The calculation formula is as follows: The target power of a single heating unit to be used = total heating power / number of heating units to be used, so as to achieve a uniform distribution of total heating power among multiple heating units to be used, ensure that the output of each heating unit is consistent in the bridging heating mode, provide a power distribution basis for uniform heating of cookware, and avoid the problem of excessively fast local heating of cookware due to uneven power distribution.

[0031] 302. Retrieve a pre-constructed mathematical model, wherein the mathematical model includes the mapping relationship between phase shift angle and power; In this embodiment, the mathematical model is constructed based on the operating characteristics of the H-type full-bridge resonant inverter circuit. The circuit operates near a fixed resonant frequency, and the LC resonant network exhibits purely resistive characteristics. The core of the mathematical model is the monotonically nonlinear mapping relationship between output power and phase shift angle. The specific construction and calibration process is as follows: First, derive the theoretical formula, assuming the DC bus voltage is... The phase shift angle is The equivalent resistance of the LC resonant network is R, and the loss compensation coefficient is... Then the output power is:

[0032] in, It is a constant between 0 and 1, used to compensate for non-ideal factors such as circuit line losses and on-state voltage drop of insulated gate bipolar transistors; Secondly, the loss compensation coefficient is determined through experimental calibration. ,Keep With R constant, multiple test points are taken within the phase shift angle range of 0 to π. The actual output power of each test point is collected, and the measured data is fitted using the least squares method to obtain a result that matches the actual hardware. The calibrated complete formula is used as a pre-built mathematical model, which can realize the mutual calculation between DC bus voltage, phase shift angle, and output power.

[0033] 303. Combining the DC bus voltage and the target power, perform inverse calculations on the mathematical model to obtain the basic phase shift angle of each heating unit to be operated; In this embodiment, the main controller calculates the equivalent resistance of the load by real-time acquisition of the resonant current, and substitutes the real-time acquisition of the DC bus voltage, the target power of each heating unit to be worked, and the equivalent resistance of the load into the calibrated mathematical model. The mathematical model is then used to perform inverse operation to solve the basic phase shift angle, so that the solved basic phase shift angle is more in line with the actual working state of the induction cooker, improving the accuracy of the basic phase shift angle, providing a reliable phase adjustment reference for subsequent power control, and ensuring the accuracy of power output.

[0034] Further, in this embodiment of the invention, the step of obtaining the design information of each heating unit to be operated, and correcting the basic phase shift angle based on the design information to obtain the corrected phase shift angle, includes: 401. Obtain the design information of each heating unit to be operated, wherein the design information includes the reference switching frequency; In this embodiment, the reference switching frequency is the standard operating switching frequency designed for the heating unit, and is the reference frequency for fixed-frequency phase-shift control.

[0035] 402. Obtain the actual switching frequency of each heating unit to be operated, calculate the frequency deviation value between the actual switching frequency and the reference switching frequency, and calculate the frequency compensation coefficient based on the frequency deviation value. In this embodiment, the actual switching frequency of each heating unit is collected by its timer module. The actual switching frequency is subtracted from the reference switching frequency to obtain the frequency deviation value. Then, the frequency compensation coefficient is calculated by division. The formula is: Frequency compensation coefficient = Reference switching frequency / Actual switching frequency. This realizes the quantitative calculation of the switching frequency deviation of the heating unit and the determination of the compensation coefficient. The hardware process deviation is transformed into a quantifiable compensation parameter, providing a quantitative basis for the subsequent accurate correction of the phase angle and avoiding phase angle control errors caused by frequency deviation.

[0036] 403. Multiply the frequency compensation coefficient by the basic phase shift angle to obtain the corrected phase shift angle; In this embodiment, the frequency compensation coefficient corresponding to each heating unit to be operated is multiplied by the previously calculated basic phase shift angle of the unit. The result of the operation is the corrected phase shift angle of the heating unit to be operated. The corrected phase shift angle is used to compensate for the power control error caused by the switching frequency deviation.

[0037] Further, in this embodiment of the invention, the step of activating the corresponding heating unit to be operated based on each of the modified phase shift angles, and calculating the actual power of each activated heating unit to be operated, includes: 501. Convert each of the corrected phase shift angles into corrected phase shift times, and generate corresponding complementary PWM signals based on the corrected phase shift times; In this embodiment, based on the fixed switching cycle of the fixed-frequency phase-shift control, the corrected phase-shift angle of each heating unit to be operated is converted using a phase-time conversion formula. The specific conversion formula is as follows:

[0038] in, To correct the phase shift angle, To correct the phase shift time, To fix the switching cycle, Solve by fixing the switching frequency; Using the calculated corrected phase shift time as a parameter, complementary PWM signals are generated for each heating unit. The complementary PWM signals have a built-in hardware dead time, which is set to 1-3. This avoids direct connection between the upper and lower bridge arms of the insulated gate bipolar transistor, ensuring the safe operation of the power devices in the heating unit and improving the reliability of the system.

[0039] 502. Send the complementary PWM signal to the corresponding heating unit to be worked, so as to activate each heating unit to work according to the power corresponding to the corrected phase shift angle; In this embodiment, 503. Collect the real-time resonant current of the activated heating unit to be operated, and calculate the actual power of each activated heating unit to be operated based on the real-time resonant current. In this embodiment, after each heating unit to be worked is activated, the main controller triggers the resonant current detection module of each heating unit to collect the effective value of the resonant current at the coil of each activated heating unit in real time at a preset sampling frequency. The power calculation coefficient, which has been pre-calibrated through experiments, is retrieved and the actual power is obtained by calculation using the formula: actual power = power calculation coefficient × square of the effective value of resonant current. The calculated actual power provides real and reliable feedback data for subsequent dynamic power adjustment, thus constructing a closed-loop feedback loop for power control.

[0040] Furthermore, in this embodiment of the invention, adjusting the output power of each activated heating unit based on the actual power using a PID algorithm includes: 601. Calculate the power error between the target power and the actual power of each activated heating unit to be operated, and obtain the power error value; In this embodiment, the main controller retrieves the target power of each activated heating unit and the actual power calculated in real time. The power error value of each unit is obtained by subtraction. The calculation formula is: Power error value = Target power - Actual power. If the power error value is positive, it indicates that the actual power is lower than the target power. If it is negative, it indicates that the actual power is higher than the target power. This realizes the quantitative calculation of power deviation, which intuitively reflects the degree of deviation between the actual power and the target power of each heating unit. It provides quantitative input parameters for the subsequent adjustment of the PID algorithm, ensuring the pertinence of power adjustment and avoiding blind adjustment without basis.

[0041] 602. Obtain a preset power error threshold, compare the power error value with the power error threshold, and determine whether there is a heating unit whose power error value exceeds the power error threshold; In this embodiment, the preset power error threshold is the maximum allowable power deviation value, which is determined by experimental calibration. The main controller compares the absolute value of the power error value of each heating unit with the power error threshold one by one to determine whether there is a heating unit whose absolute value of the power error value is greater than the power error threshold. If there is, the unit is marked; otherwise, the process proceeds directly to steps 603 to 605. The power error threshold is used to classify and determine the power deviation, distinguishing between normal power deviation and power deviation exceeding the threshold. This provides a basis for determining different power adjustment strategies in the future, avoids over-adjustment of small power deviations, improves the stability of power control, and promptly identifies power deviations exceeding the threshold to ensure the accuracy of power control.

[0042] 603. If it does not exist, the power error value is input into the main PID controller, and the phase shift angle is fine-tuned by proportional, integral, and derivative operations. In this embodiment, if it is determined that there are no heating units with power error values ​​exceeding the threshold, the main controller inputs the power error values ​​of each heating unit into an independent main PID controller. The main PID controller adopts a digital discrete PID algorithm, adapted to the microprocessor computing characteristics of the main controller. The proportional coefficient, integral coefficient, and derivative coefficient of the main PID controller are experimentally calibrated to meet the small adjustment requirements of normal power deviation. The proportional coefficient ranges from 0.5 to 2, the integral coefficient ranges from 0.01 to 0.1, and the derivative coefficient ranges from 0.05 to 0.3. The main PID controller calculates the phase shift angle fine-tuning amount corresponding to each heating unit. The phase shift angle fine-tuning amount is a small adjustment value for correcting the phase shift angle, realizing fast, accurate, and stable adjustment of normal power deviation, and ensuring the constantness of power output.

[0043] 604. The phase shift angle fine-tuning amount is superimposed with the corresponding corrected phase shift angle to obtain the total phase shift angle; In this embodiment, the phase shift angle fine-tuning amount obtained by the main PID controller for each heating unit is added to the corresponding corrected phase shift angle of that unit. The result is the total phase shift angle of that heating unit. If the total phase shift angle after addition exceeds the preset effective range of 0 to π, the critical value of the effective range is taken as the total phase shift angle. This achieves dynamic adjustment of the phase shift angle, transforming the compensation of conventional power deviation into fine-tuning of the phase shift angle, so that the phase shift angle matches the actual power deviation, ensuring that the output power of the heating unit approaches the target power. At the same time, the range of the total phase shift angle is limited to avoid power overload or no output due to the phase shift angle being too large or too small, thereby improving the operational safety of the system.

[0044] 605. Convert the total phase shift angle into an update phase shift time, generate a corresponding update complementary PWM signal based on the update phase shift time, and adjust the output power of each activated heating unit based on the update complementary PWM signal; In this embodiment, the total phase shift angle of each heating unit is converted into the corresponding update phase shift time using the phase-time conversion formula described in step 501. Then, the update phase shift time is used as a parameter to generate a corresponding update complementary PWM signal. The update complementary PWM signal is sent to the isolation drive circuit of each heating unit. The isolation drive circuit adjusts the on / off time of the insulated gate bipolar transistor according to the updated signal, thereby realizing the dynamic adjustment of the output power of each heating unit. This can quickly compensate for the power deviation caused by grid voltage fluctuations and slight load changes, ensuring the constant output power of each heating unit.

[0045] Furthermore, in this embodiment of the invention, after determining whether there is a heating unit with a power error value exceeding the power error threshold, the method further includes: 701. If it exists, calculate the deviation between the power error value and the power error threshold; In this embodiment, if a heating unit is determined to have a power error value exceeding the power error threshold, the main controller processes the power error value of this type of heating unit and calculates the deviation between the power error value and the power error threshold. The calculation formula is: Deviation = Absolute value of power error value - Power error threshold. This deviation is the power deviation value that exceeds the allowable range. This realizes the quantitative calculation of the power deviation exceeding the threshold, clarifies the degree of power deviation exceeding the allowable range, and provides quantitative input parameters for subsequent additional compensation adjustments. This ensures the targeting and accuracy of the additional adjustments and avoids insufficient compensation caused by only performing conventional adjustments for deviations exceeding the threshold.

[0046] 702. Input the power error value into the main PID controller, and calculate the phase shift angle fine-tuning amount through proportional, integral, and derivative operations; In this embodiment, the power error value of the heating unit with power deviation exceeding the threshold is input to the main PID controller corresponding to the unit. The main PID controller performs calculations according to the digital discrete PID algorithm and preset parameters described in step 603 to obtain the phase angle fine adjustment amount of the heating unit. The phase angle fine adjustment amount is the basic compensation amount for the normal power deviation, and the calculation method is completely consistent with step 603.

[0047] 703. Input the deviation into the balanced compensation PID controller, and calculate the additional fine-tuning amount through proportional, integral, and derivative operations; In this embodiment, the calculated deviation is input into the equalization compensation PID controller corresponding to the heating unit. This controller is an auxiliary control controller independent of the main PID controller. It also adopts the digital discrete PID algorithm. Its equalization compensation proportional coefficient, equalization compensation integral coefficient, and equalization compensation derivative coefficient have been experimentally calibrated. The value range of the equalization compensation proportional coefficient is 3 to 8, the value range of the equalization compensation integral coefficient is 0.2 to 0.5, and the value range of the equalization compensation derivative coefficient is 0.1 to 0.4. The overall parameters are greater than those of the main PID controller, which is suitable for large adjustment requirements. The balanced compensation PID controller calculates an additional fine-tuning amount for the phase shift angle. This additional fine-tuning amount is a supplementary adjustment to the basic fine-tuning amount and is a large value. It adapts to the large adjustment requirements of the over-threshold deviation and avoids insufficient compensation caused by the parameter setting limitations of the main PID controller, thereby achieving accurate and sufficient compensation for the over-threshold power deviation.

[0048] 704. The phase shift angle fine-tuning amount, the additional fine-tuning amount, and the corresponding corrected phase shift angle are superimposed to obtain the total phase shift angle; In this embodiment, the phase shift angle fine-tuning amount and additional fine-tuning amount of the heating unit with the corresponding corrected phase shift angle are added to obtain the total phase shift angle of the heating unit. If the total phase shift angle after superposition exceeds the preset effective range of 0 to π, the critical value of the effective range is taken as the total phase shift angle. This achieves dual-layer compensation adjustment of the phase shift angle, combining conventional compensation with additional compensation, so that the adjustment amount of the phase shift angle is adapted to the power deviation with the over-threshold, ensuring that the power deviation is fully and accurately compensated. At the same time, the range of the total phase shift angle is limited to avoid power overload caused by excessive adjustment amount, thereby improving the working safety of the system.

[0049] 705. Convert the total phase shift angle into an update phase shift time, generate a corresponding update complementary PWM signal based on the update phase shift time, and adjust the output power of each activated heating unit based on the update complementary PWM signal.

[0050] The power control method for a multi-burner induction cooker in this embodiment of the invention has been described above. The power control device for the multi-burner induction cooker in this embodiment of the invention is described below. Please refer to [link / reference]. Figure 2 One embodiment of the power control device for a multi-burner induction cooker in this invention includes: The acquisition module 801 is used to acquire the total heating power set by the user and to acquire the resonant current information of each heating unit; The determining module 802 is used to determine the cookware coverage information based on the resonant current information, and to determine the work information to be performed based on the cookware coverage information. The work information to be performed includes the working mode, the number and quantity of the heating unit to be worked. Calculation module 803 is used to obtain the DC bus voltage and determine the basic phase shift angle of each heating unit based on the number of heating units to be operated, the DC bus voltage, and the total heating power. The correction module 804 is used to acquire the design information of each heating unit to be operated, and correct the basic phase shift angle based on the design information to obtain the corrected phase shift angle; The activation module 805 is used to activate the corresponding heating unit to be worked based on each of the modified phase shift angles, and to calculate the actual power of each activated heating unit to be worked. The adjustment module 806 is used to adjust the output power of each activated heating unit to be operated based on the actual power using a PID algorithm.

[0051] Based on the same ideas as the methods in the above embodiments, the apparatus provided in this application can implement the methods in the above embodiments.

[0052] above Figure 2 The power control device of the multi-burner induction cooker in this embodiment of the invention is described in detail from the perspective of modular functional entities. The power control device of the multi-burner induction cooker in this embodiment of the invention is described in detail from the perspective of hardware processing.

[0053] Figure 3This is a schematic diagram of the structure of a power control device 900 for a multi-burner induction cooker according to an embodiment of the present invention. The power control device 900 can vary significantly due to different configurations or performance characteristics. It may include one or more central processing units (CPUs) 910 and a memory 920, and one or more storage media 930 (e.g., one or more mass storage devices) storing application programs 933 or data 932. The memory 920 and storage media 930 can be temporary or persistent storage. The program stored in the storage media 930 may include one or more modules (not shown in the diagram), each module including a series of instruction operations on the power control device 900 of the multi-burner induction cooker. Furthermore, the processor 910 may be configured to communicate with the storage media 930 and execute the series of instruction operations in the storage media 930 on the power control device 900 of the multi-burner induction cooker to implement the steps of the power control method for the multi-burner induction cooker provided in the above-described method embodiments.

[0054] The power control device 900 of the multi-burner induction cooker may also include one or more power supplies 940, one or more wired or wireless network interfaces 950, one or more input / output interfaces 960, and / or one or more operating systems 931, such as Windows Server, Mac OS X, Unix, Linux, FreeBSD, etc. Those skilled in the art will understand that... Figure 3 The power control device structure of the multi-burner induction cooker shown does not constitute a limitation on the power control device of the multi-burner induction cooker. It may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0055] The present invention also provides a computer-readable storage medium, which can be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium, wherein the computer-readable storage medium stores instructions that, when executed on a computer, cause the computer to perform the steps of a power control method for a multi-burner induction cooker.

[0056] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system, device, or unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0057] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0058] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A power control method for a multi-burner induction cooker, characterized in that, The method is applicable to multi-head induction cookers comprising N independent heating units, where N ≥ 2 and is an even number; the method includes: Obtain the total heating power set by the user, and obtain the resonant current information of each heating unit; The cookware coverage information is determined based on the resonant current information, and the work information to be performed is determined based on the cookware coverage information. The work information to be performed includes the working mode, the number and quantity of the heating unit to be worked. Obtain the DC bus voltage, and determine the basic phase shift angle of each heating unit based on the number of heating units to be operated, the DC bus voltage, and the total heating power; Obtain the design information of each heating unit to be operated, and correct the basic phase shift angle based on the design information to obtain the corrected phase shift angle; Activate the corresponding heating unit to be worked based on each of the modified phase shift angles, and calculate the actual power of each activated heating unit to be worked; Based on the actual power, a PID algorithm is used to adjust the output power of each activated heating unit.

2. The power control method for a multi-burner induction cooker according to claim 1, characterized in that, The process of determining cookware coverage information based on the resonant current information and determining the work information to be performed based on the cookware coverage information includes: A preset pot-containing current threshold is retrieved, and the resonant current information is compared with the preset pot-containing current threshold to determine whether there is a pot above each heating unit. If a cookware has only one heating unit, then that heating unit is identified as the heating unit to be used, and the working mode is set to single-point heating mode. If the number of heating units in a cookware is greater than 1, the resonant current information of each heating unit is compared to determine whether the same cookware covers multiple areas. If it is determined that the same cookware covers multiple areas, the working mode will be set to bridged heating mode, and the number of the heating unit to be worked will be determined based on the area covered by the same cookware.

3. The power control method for a multi-burner induction cooker according to claim 1, characterized in that, The acquisition of the DC bus voltage, based on the number of heating units to be operated, the DC bus voltage, and the total heating power, determines the basic phase shift angle of each heating unit to be operated, including: The total heating power is evenly distributed to each heating unit to be worked, and the target power corresponding to each heating unit to be worked is calculated. Retrieve a pre-constructed mathematical model, which includes the mapping relationship between phase shift angle and power; By combining the DC bus voltage and the target power, the mathematical model is solved by inverse operation to obtain the basic phase shift angle of each heating unit to be operated.

4. The power control method for a multi-burner induction cooker according to claim 1, characterized in that, The process of acquiring the design information of each heating unit to be operated, and correcting the basic phase shift angle based on the design information to obtain the corrected phase shift angle, includes: Obtain the design information of each heating unit to be operated, including the reference switching frequency; Obtain the actual switching frequency of each heating unit to be operated, calculate the frequency deviation value between the actual switching frequency and the reference switching frequency, and calculate the frequency compensation coefficient based on the frequency deviation value. The corrected phase shift angle is obtained by multiplying the frequency compensation coefficient by the base phase shift angle.

5. The power control method for a multi-burner induction cooker according to claim 1, characterized in that, The step of activating the corresponding heating unit to be operated based on each of the modified phase shift angles, and calculating the actual power of each activated heating unit to be operated, includes: Each of the corrected phase shift angles is converted into a corrected phase shift time, and a corresponding complementary PWM signal is generated based on the corrected phase shift time; The complementary PWM signal is sent to the corresponding heating unit to be operated, so as to activate each heating unit to operate according to the power corresponding to the corrected phase shift angle; The real-time resonant current of the activated heating unit is collected, and the actual power of each activated heating unit is calculated based on the real-time resonant current.

6. The power control method for a multi-burner induction cooker according to claim 3, characterized in that, The step of adjusting the output power of each activated heating unit based on the actual power using a PID algorithm includes: Calculate the power error between the target power and the actual power of each activated heating unit to be operated, and obtain the power error value; A preset power error threshold is obtained, and the power error value is compared with the power error threshold to determine whether there is a heating unit whose power error value exceeds the power error threshold. If it does not exist, the power error value is input into the main PID controller, and the phase shift angle is fine-tuned by proportional, integral, and derivative operations. The phase shift angle fine-tuning amount is superimposed with the corresponding corrected phase shift angle to obtain the total phase shift angle; The total phase shift angle is converted into an update phase shift time, a corresponding update complementary PWM signal is generated based on the update phase shift time, and the output power of each activated heating unit is adjusted based on the update complementary PWM signal.

7. The power control method for a multi-burner induction cooker according to claim 6, characterized in that, After determining whether there is a heating unit with a power error value exceeding the power error threshold, the method further includes: If it exists, calculate the deviation between the power error value and the power error threshold; The power error value is input into the main PID controller, and the phase shift angle fine-tuning amount is calculated through proportional, integral, and derivative operations. The deviation is input into the balanced compensation PID controller, and the additional fine-tuning amount is calculated through proportional, integral, and derivative operations. The total phase shift angle is obtained by superimposing the phase shift angle fine-tuning amount, the additional fine-tuning amount, and the corresponding corrected phase shift angle. The total phase shift angle is converted into an update phase shift time, a corresponding update complementary PWM signal is generated based on the update phase shift time, and the output power of each activated heating unit is adjusted based on the update complementary PWM signal.

8. A power control device for a multi-burner induction cooker, characterized in that, include: The acquisition module is used to acquire the total heating power set by the user and to acquire the resonant current information of each heating unit; The determination module is used to determine the cookware coverage information based on the resonant current information, and to determine the work information to be performed based on the cookware coverage information. The work information to be performed includes the working mode, the number and quantity of the heating unit to be worked. The calculation module is used to obtain the DC bus voltage and determine the basic phase shift angle of each heating unit based on the number of heating units to be operated, the DC bus voltage, and the total heating power. The correction module is used to acquire the design information of each heating unit to be operated, and correct the basic phase shift angle based on the design information to obtain the corrected phase shift angle; The activation module is used to activate the corresponding heating unit to be worked based on each of the modified phase shift angles, and to calculate the actual power of each activated heating unit to be worked. The adjustment module is used to adjust the output power of each activated heating unit to be operated based on the actual power using a PID algorithm.

9. A power control device for a multi-burner induction cooker, characterized in that, The power control device of the multi-burner induction cooker includes: a memory and at least one processor, wherein the memory stores instructions; At least one of the processors invokes the instructions in the memory to cause the power control device of the multi-burner induction cooker to perform the steps of the power control method of the multi-burner induction cooker as described in any one of claims 1-7.

10. A computer-readable storage medium storing instructions thereon, characterized in that, When the instructions are executed by the processor, they implement the various steps of the power control method for the multi-head induction cooker as described in any one of claims 1-7.

Images