Inductive Aerosol Heating with Adaptive Susceptor Temperature Calibration
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Solution Overview
Problem
Existing aerosol-generating devices with inductive heating systems face challenges in accurately monitoring and controlling temperature to prevent overheating, which can lead to the formation of undesirable compounds and affect user experience.
Innovation Solution
An aerosol-generating device with an inductive heating arrangement and power source that performs calibration processes to adjust susceptor temperature based on measured calibration values, including regular re-measurements at predetermined intervals or in response to user puffs, to ensure accurate temperature regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous heating is applied to the susceptor, then aerosol production efficiency is improved, but temperature control accuracy deteriorates leading to overheating risk
Solution Approach 1:
The system applies periodic heating pulses rather than continuous heating, with each pulse duration and interval carefully controlled. This allows the susceptor to be heated to the required temperature for aerosol generation while providing cooling intervals that prevent overheating and maintain temperature control accuracy throughout operation.
Solution Approach 2:
The system continuously monitors the impedance of the susceptor, which changes with temperature, and uses this feedback to adjust the heating power in real-time. This closed-loop control ensures that the susceptor maintains the optimal temperature for aerosol production without exceeding safe limits, resolving the contradiction between productivity and temperature control accuracy.
2Measurement precision
If calibration values are frequently re-measured, then temperature regulation accuracy is improved, but device operation complexity increases
Solution Approach 1:
The system automatically performs calibration value re-measurements at predetermined intervals or when triggered by specific conditions, without requiring manual intervention from the user. The controller autonomously manages the calibration process, updating the calibration values and applying them to maintain accurate temperature regulation, thereby improving measurement precision while avoiding increased operational complexity for the user.
3Reliability
If temperature monitoring is continuously performed, then safety is improved, but energy consumption increases
Solution Approach 1:
The system continuously monitors susceptor temperature through impedance measurement, which provides uninterrupted safety monitoring. However, the actual heating action is delivered in periodic pulses rather than continuously, allowing the system to maintain safety through continuous measurement while reducing energy consumption by applying heat only when necessary to maintain the target temperature range.
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
This method enhances temperature control, preventing overheating and improving safety by ensuring consistent and reliable aerosol production, thereby enhancing user experience.
Implementation Method 1
an inductive heating arrangement and a power source for providing power to the inductive heating arrangement
Implementation Method 2
inductive heating arrangement...configured to heat an aerosol-forming substrate
Implementation Method 3
monitoring a power source parameter to identify a start point and an end point of a reversible phase transition of the susceptor
Implementation Method 4
reversible phase transition of the susceptor...second calibration value corresponding to a second calibration temperature at which the susceptor undergoes the reversible phase transition
Data Source
Figure 1~2B
Figure 3
Figure 4~5
AI summary
A method for controlling aerosol production in an aerosol-generating device is provided. The device comprises an inductive heating arrangement and a power source for providing power to the inductive heating arrangement. The method comprises, during a second heating phase during user operation of the aerosol-generating device for producing an aerosol, controlling power provided to the inductive heating arrangement such that the temperature of the susceptor is adjusted based on the one or more calibration values, and re-measuring at least one of the one or more calibration values by performing one or more further iterations of the calibration process for adjusting the one or more calibration values, wherein the temperature of the susceptor is adjusted based at least in part on the at least one of the one or more calibration values resulting from a latest iteration of the calibration process prior to adjusting the temperature of the susceptor.