Inductive Heating Susceptor Temperature Control via Step-Wise Power Adjustment
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Solution Overview
Problem
Aerosol-generating devices face challenges in accurately and reliably monitoring and controlling the temperature of inductive heating devices to maintain consistent aerosol production over time, particularly due to substrate depletion and thermodiffusion issues.
Innovation Solution
A method involving a step-wise increase in the temperature of the susceptor using an inductive heating arrangement, with power control based on conductance or resistance values, and a calibration process to maintain optimal temperature regulation, ensuring consistent aerosol delivery throughout the user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the temperature of the susceptor is increased to maintain aerosol production, then aerosol delivery is maintained, but substrate depletion and thermodiffusion occur leading to reduced aerosol delivery over time
Solution Approach 1:
The patent implements periodic temperature adjustment through multiple heating phases (preheat phase, first operating phase with first temperature, second operating phase with second temperature). This periodic heating strategy allows the system to maintain aerosol production while managing substrate depletion and thermodiffusion effects by varying temperature over time rather than maintaining a constant high temperature.
Solution Approach 2:
The patent applies preliminary action through the preheat phase that occurs before the main operating phases. During this phase, the susceptor is heated to a predetermined temperature to prepare the system for aerosol generation. This preliminary heating ensures optimal conditions are established before actual aerosol production begins, improving consistency and reducing initial variability.
2Duration of action of stationary object
If continuous heating is applied to maintain temperature, then aerosol production is sustained, but energy consumption increases and temperature control accuracy decreases
Solution Approach 1:
The patent employs periodic heating with distinct phases (preheat, first operating, second operating) rather than continuous heating. Power is supplied in controlled intervals with specific durations for each phase, allowing the system to maintain aerosol production over an extended period while managing energy consumption through optimized heating cycles rather than constant power application.
Solution Approach 2:
The patent implements dynamic temperature control by transitioning between different operating temperatures (first temperature in the first operating phase, second temperature in the second operating phase). This dynamic adjustment allows the system to adapt heating levels to operational needs, maintaining aerosol production duration while optimizing energy usage according to the specific requirements of each phase.
3Measurement precision
If temperature monitoring and control systems are made more complex to improve accuracy, then temperature control improves, but device complexity and cost increase
Solution Approach 1:
The patent implements feedback mechanisms through power supply control that responds to operational phase detection. The controller monitors which phase is active (preheat, first operating, or second operating) and automatically adjusts power delivery accordingly. This feedback-based approach achieves accurate temperature control by linking power supply directly to operational state without requiring complex continuous temperature sensing and adjustment systems.
Solution Approach 2:
The system achieves temperature control through self-service mechanisms where the controller automatically manages power distribution based on detected operational phases. The predetermined time intervals and phase transitions enable the system to self-regulate heating levels without external intervention or complex monitoring infrastructure, simplifying the overall control architecture while maintaining precision.
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 approach ensures sustained and consistent aerosol production by preventing substrate depletion and thermodiffusion, maintaining optimal temperature control, and improving reliability through periodic calibration and pre-heating processes.
Implementation Method 1
The inductor generates an alternating magnetic field that causes heating in the susceptor
Implementation Method 2
The inductor generates an alternating magnetic field that causes heating in the susceptor
Implementation Method 3
The inductor generates an alternating magnetic field that causes heating in the susceptor
Implementation Method 4
heat is transferred from the susceptor to the aerosol-forming substrate primarily by conduction
Data Source
AI summary
A method for controlling aerosol production in an aerosol-generating device is provided, the aerosol-generating device including an inductive heating arrangement and a power source configured to provide power to the inductive heating arrangement, the method including: controlling the power provided to the inductive heating arrangement to cause a step-wise increase of a temperature of a susceptor associated with the aerosol-generating device from a first operating temperature to a second operating temperature, the susceptor being configured to heat an aerosol-forming substrate, the power being controlled based on a measured resistance, conductance, or current associated with the susceptor, and in which the measured resistance, conductance, or current associated with the susceptor is determined based on a DC current drawn from the power source. An aerosol-generating device, and an aerosol-generating system including the aerosol-generating device and an aerosol-generating article, are also provided.