CN-122017341-A - Method and system for calibrating factory power of induction cooker

CN122017341ACN 122017341 ACN122017341 ACN 122017341ACN-122017341-A

Abstract

The application belongs to the technical field of induction cooker production, and discloses an induction cooker delivery power calibration method and system, wherein the method comprises the steps of responding to a trigger instruction, entering a power calibration mode; the method comprises the steps of acquiring an initial power AD value of a current gear, driving a main control MCU of an induction cooker to control the induction cooker to heat a standard test cooker, acquiring actual output power of the induction cooker, comparing the actual output power with target output power corresponding to the current gear, gradually adjusting the power AD value to ensure that deviation between the actual output power and the target output power is in a preset tolerance range, obtaining an optimal power AD value of the current gear, writing the optimal power AD value into a nonvolatile memory of a display MCU, and finally exiting a power calibration mode, thereby improving consistency and accuracy of power output of the induction cooker, realizing automatic calibration of the full power gear, reducing manual intervention and hardware cost, and improving production efficiency.

Inventors

XU SHENGZONG
WANG TIEZHU
Gao Haoxuan
CHENG NIANBIN
HUANG TONGHUA

Assignees

国芯微电子(广东)有限公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. The factory power calibration method for the induction cooker is characterized by being applied to a display MCU integrated with a nonvolatile memory of the double MCU architecture induction cooker, and comprises the following steps: A1. Responding to a preset triggering instruction, and controlling the induction cooker to enter a power calibration mode; A2. After entering a power calibration mode, sequentially executing a closed-loop adjustment step for a plurality of preset power gears to determine an optimal power AD value corresponding to each preset power gear, and writing the optimal power AD value into a nonvolatile memory of a display MCU, wherein the closed-loop adjustment step comprises the following steps: A201. Acquiring an initial power AD value of a current gear, and driving a main control MCU of the induction cooker to control the induction cooker to heat a standard test cooker according to the initial power AD value; A202. the method comprises the steps of collecting actual output power of an induction cooker, comparing the actual output power with target output power corresponding to a current gear, and gradually adjusting a power AD value based on a comparison result to enable deviation between the actual output power and the target output power to be in a preset tolerance range, so that an optimal power AD value of the current gear is obtained; A203. writing the optimal power AD value into a nonvolatile memory of the display MCU; A3. and after the determination and writing of the optimal power AD values of all the preset power gears are completed, exiting the power calibration mode.
2. The method of claim 1, wherein in the power calibration mode, all conventional heating instructions from the interactive modules of the induction cooker are masked and only control instructions related to power calibration are responded.
3. The method for calibrating factory power of an induction cooker according to claim 1, wherein step A1 comprises: A101. Monitoring whether a preset combined operation event occurs to an interaction module of the induction cooker; A102. if a preset combined operation event occurs, judging that the trigger instruction is received, and controlling the induction cooker to enter a power calibration mode.
4. The method for calibrating factory power of an induction cooker according to claim 1, wherein step a201 comprises: B1. reading an initial power AD value of a current gear from a nonvolatile memory of the display MCU; B2. And generating a driving instruction according to the initial power AD value, sending the driving instruction to a main control MCU of the induction cooker, enabling the main control MCU to generate a control parameter according to the initial power AD value, and controlling a power circuit of the induction cooker to heat the standard test cooker according to the control parameter.
5. The method for calibrating factory power of an induction cooker according to claim 4, further comprising the steps of, after step B1 and before step B2: B3. acquiring current power grid voltage information; B4. Comparing the power grid voltage information with standard mains voltage information, and compensating the initial power AD value; In step B2, the driving command is generated according to the compensated initial power AD value.
6. The method for calibrating factory power of an induction cooker according to claim 5, wherein step B4 comprises: determining a voltage compensation coefficient from a preset nonlinear compensation lookup table according to the deviation between the current power grid voltage information and preset standard mains voltage information and the target output power corresponding to the current gear; and adjusting the initial power AD value according to the voltage compensation coefficient to obtain a compensated initial power AD value.
7. The method for calibrating factory power of an induction cooker according to claim 1, wherein step a202 comprises: C1. Receiving actual output power obtained by the main control MCU based on operation electric parameters of a power circuit through calculation and uploading; C2. Calculating a difference value of the actual output power and the target output power corresponding to the current gear; C3. Acquiring an adjustment step length of the power AD value, and determining an adjustment direction of the power AD value according to the difference value and a preset tolerance range, wherein the adjustment direction comprises upward adjustment, downward adjustment and maintenance; C4. according to the adjustment step length and the adjustment direction, adjusting a power AD value, and driving the main control MCU to control the induction cooker to heat the standard test cooker according to the adjusted power AD value; C5. and C1-C4, and taking the current power AD value as the optimal power AD value of the current gear until a preset stopping condition is met.
8. The method for calibrating factory power of an induction cooker according to claim 7, wherein in step C3, the adjustment step size is determined according to the following formula: S=A*B; wherein A is a power allowable fluctuation coefficient, and B is program data transmission precision.
9. The method for calibrating power of an electromagnetic oven according to claim 7, wherein in step C3, the step of determining the adjustment direction of the power AD value according to the difference and the preset tolerance range includes: if the absolute value of the difference value exceeds a preset tolerance range and the difference value is positive, determining the adjustment direction as downward adjustment; If the absolute value of the difference value exceeds a preset tolerance range and the difference value is negative, determining the adjustment direction as upward adjustment; and if the absolute value of the difference value does not exceed the preset tolerance range, determining the adjustment direction to be unchanged.
10. The system for calibrating the factory power of the induction cooker is characterized by comprising the induction cooker to be calibrated and a standard test cooker, wherein the induction cooker to be calibrated is a double-MCU-architecture induction cooker comprising a main control MCU and a display MCU, the display MCU is integrated with a nonvolatile memory, and the display MCU is used for executing the steps of the method for calibrating the factory power of the induction cooker according to any one of claims 1-9.

Description

Method and system for calibrating factory power of induction cooker Technical Field The application relates to the technical field of induction cooker production, in particular to an induction cooker delivery power calibration method and system. Background The existing electromagnetic oven with double MCU architecture is generally designed by separating a main control board and a display board structurally, wherein the main control board is responsible for a power control function, and the display board is responsible for a user interaction function. The main control board generally comprises a main control MCU, a power circuit (including a switching device driving circuit and an LC resonance circuit) and a current/voltage sampling circuit, and the display board generally comprises a display MCU, an interaction module (such as a key, a voice interaction module and the like) and a display module (such as a digital tube/LED). The structure faces a remarkable difficulty in the mass production process, and because unavoidable manufacturing tolerances of power circuit components exist, such as capacitance deviation of resonance capacitors, precision error of sampling resistors, inductance difference of coil panels and the like, obvious inconsistency of actual output power of the induction cooker products even if the induction cooker products adopting the same design scheme can occur. Such power output dispersion not only affects product performance uniformity, but also negatively affects user experience and market compliance. In order to improve the discreteness, power calibration and calibration are generally performed on an electromagnetic oven before delivery, and a main power calibration and calibration method in the prior art comprises the following steps: the hardware adjusting mode is that a resistor pad for power correction or an adjustable potentiometer is reserved on a circuit board, and at a production terminal, a manufacturer manually replaces resistors or rotary potentiometers with different resistance values according to the power meter until the power reaches the standard. This approach is currently the most common practice. The software single-point calibration method is that a fixed compensation coefficient is written into an EEPROM of a main control chip through a burner, and the coefficient is usually corrected only for a rated maximum power point, and a power curve of small and medium fire is ignored. The method mainly has three technical limitations that firstly, the hardware adjustment mode needs manual intervention, the power correction is realized by changing a resistor or adjusting a potentiometer, the method is low in efficiency, material management and manual operation cost are increased, secondly, the existing calibration method usually only carries out single-point calibration on a rated maximum power point, the accuracy of output power of each gear in the whole power range cannot be ensured, and finally, most software calibration schemes need to additionally configure an external memory to store calibration parameters, so that hardware cost is increased, and precious circuit board space is occupied. It is particularly notable that in a dual MCU architecture of an induction cooker, the display MCU typically integrates non-volatile memory, but this hardware resource is not fully utilized in prior art schemes. Meanwhile, the processing capacity of the display MCU is idle relative to that of the main control MCU, which provides a hardware basis for developing a more efficient power calibration scheme. On the premise of unchanged existing hardware architecture, a solution capable of realizing automatic calibration of a full-power section without adding extra cost is developed, and the method becomes a technical bottleneck to be broken through in the field of electromagnetic oven production. In view of the above, there is a need in the art for improvements. Disclosure of Invention The application aims to provide a factory power calibration method and system for an induction cooker, which have the advantages of improving the consistency and accuracy of power output of the induction cooker, realizing automatic calibration of full-power gears, reducing manual intervention and hardware cost and improving production efficiency. In a first aspect, the application provides a method for calibrating factory power of an induction cooker, which is applied to a display MCU integrated with a nonvolatile memory of a double MCU architecture induction cooker, and comprises the following steps: A1. Responding to a preset triggering instruction, and controlling the induction cooker to enter a power calibration mode; A2. After entering a power calibration mode, sequentially executing a closed-loop adjustment step for a plurality of preset power gears to determine an optimal power AD value corresponding to each preset power gear, and writing the optimal power AD value into a nonvolatile memory of a display M