Induction Heating Frequency Calibration for Stable Resonant Smoking Devices
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Solution Overview
Problem
Existing heat-not-burn smoking devices face challenges in maintaining heating stability due to deviations in the resonant frequency of the resonant network caused by temperature changes, component manufacturing errors, and long-term use.
Innovation Solution
An electromagnetic induction heating control method that calibrates the input frequency of the excitation source before heating to ensure it aligns with the resonant frequency of the resonant network, thereby maintaining high heating stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electromagnetic induction heating is used with a resonant network, then heating efficiency is improved, but heating stability deteriorates due to frequency deviation from temperature changes and manufacturing errors
Solution Approach 1:
The patent applies preliminary action by performing frequency calibration before the heating process. The control device calibrates the excitation source frequency to match the resonant network's actual resonant frequency before heating begins, ensuring the system operates at optimal efficiency while maintaining stability throughout the heating process.
Solution Approach 2:
The patent implements feedback by using a calibration process that measures the actual resonant frequency of the resonant network and adjusts the excitation source frequency accordingly. This closed-loop approach ensures the system compensates for manufacturing errors and temperature-induced frequency shifts, maintaining both high efficiency and stable operation.
2Device complexity
If the excitation source frequency is fixed, then device complexity is reduced, but heating stability deteriorates due to resonant frequency deviation
Solution Approach 1:
The patent applies preliminary action by performing frequency calibration before the heating process. The control device calibrates the excitation source frequency to match the resonant network's actual resonant frequency before heating begins, ensuring the system operates at optimal efficiency while maintaining stability throughout the heating process.
Solution Approach 2:
The patent implements parameter changes by adjusting the excitation source frequency based on the calibrated resonant frequency. Instead of using a fixed frequency, the system dynamically sets the operating frequency to match the actual resonant frequency of the resonant network, compensating for manufacturing tolerances and temperature effects.
3Temperature
If temperature increases during operation, then heating effectiveness is improved, but resonant frequency deviates reducing heating stability
Solution Approach 1:
The patent applies preliminary action by performing frequency calibration before the heating process. The control device calibrates the excitation source frequency to match the resonant network's actual resonant frequency before heating begins, ensuring the system operates at optimal efficiency while maintaining stability throughout the heating process.
Solution Approach 2:
The patent implements dynamics by making the excitation source frequency adjustable and adaptive. The system calibrates the frequency before heating and can adjust it during operation to track changes in the resonant frequency caused by temperature increases, maintaining optimal coupling between the excitation source and resonant network throughout the heating process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method ensures the resonant network operates in a resonant state, improving heating stability and preventing overheating, which enhances the overall performance of the heat-not-burn smoking device.
Implementation Method 1
the electromagnetic heating coil of the electromagnetic sending device sends high-frequency AC signals to the heating metal induction element. The metal induction element, in a changing magnetic field or moving in a non-uniform magnetic field, will generate an induced electromotive force
Implementation Method 2
The metal induction element, in a changing magnetic field or moving in a non-uniform magnetic field, will generate an induced electromotive force. Since the resistance of the metal is very small, even if the induced electromotive force is not large, it can cause a strong current
Implementation Method 3
This results in a thermal effect that heats the aerosol generating product
Implementation Method 4
The driving circuit converts the power supply into a high-frequency power signal based on the excitation source input to the MOS transistor to drive the resonant network to generate a high-frequency sine wave signal. The frequency of the resonant network is determined by the inductance (denoted by L2) and the capacitance (denoted by C2)
Data Source
AI summary
The electromagnetic induction heating control method includes supplying the driving circuit with the excitation source with an initial frequency at a first duty cycle to initiate operation of the resonant network, the first duty cycle being less than 50%; and collecting a working current of the resonant network in real time, adjusting the input frequency of the excitation source within a preset frequency range to find a maximum working current, setting the input frequency at the maximum working current as an optimal input frequency, and adjusting the input frequency of the excitation source to the optimal input frequency. In such a way, the working frequency is adjusted close to the resonant frequency of the resonant network, thereby ensuring that the resonant network works in a resonant state, and ensuring high heating stability.