Susceptor Temperature Sensing by Coil Resonance in Aerosol Heaters
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Solution Overview
Problem
Existing non-contact temperature detection methods for susceptors in aerosol generating devices are inaccurate and slow, and they can damage temperature sensors due to heating, while also being less efficient in power usage.
Innovation Solution
An aerosol generating device that includes a susceptor, a first coil for induction heating, a second coil with a resonance frequency that varies with temperature changes, and a controller that calculates the susceptor's temperature based on the resonance frequency change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is directly attached to the susceptor for contact-type temperature detection, then the temperature can be measured, but the temperature sensor is at risk of damage due to heating and power efficiency is reduced
Solution Approach 1:
The patent uses the susceptor itself as an intermediary element. The susceptor is heated by induction and its temperature is inferred from the resonance frequency changes of the coil, rather than directly contacting a temperature sensor with the hot susceptor. This mediator approach (using the susceptor's electromagnetic properties) protects the temperature sensor from direct thermal exposure while still enabling accurate temperature measurement.
Solution Approach 2:
The patent replaces the mechanical contact-type temperature sensor system with an electromagnetic field-based measurement system. Instead of mechanically attaching a temperature sensor to the susceptor, the system uses the resonance frequency of the coil, which changes in response to the susceptor's temperature, to indirectly measure temperature without mechanical or direct thermal contact.
2Measurement precision
If a contact-type temperature sensor is used to measure susceptor temperature, then temperature detection is possible, but power efficiency is lower compared to non-contact methods
Solution Approach 1:
The patent replaces the power-consuming contact-type temperature sensor system with an electromagnetic resonance-based measurement system. The coil's resonance frequency naturally changes with the susceptor's temperature due to electromagnetic coupling, eliminating the need for additional power-intensive sensing mechanisms while maintaining accurate temperature detection.
3Reliability
If existing non-contact methods using Curie temperature are used, then temperature detection is possible, but the performance varies according to susceptor physical properties and detection accuracy is reduced
Solution Approach 1:
The patent changes the measurement parameter from relying on the susceptor's Curie temperature (which varies with material properties) to measuring the resonance frequency of the coil system. The resonance frequency changes in response to the susceptor's temperature through electromagnetic coupling, providing a more consistent and accurate measurement that is not dependent on the specific physical properties or material composition of the susceptor.
4Reliability
If ambient temperature of susceptor is measured to infer susceptor temperature, then non-contact detection is achieved, but temperature detection speed is low and accuracy is reduced
Solution Approach 1:
The patent uses the electromagnetic field between the coil and susceptor as an intermediary that provides direct information about the susceptor's temperature. The resonance frequency of the coil is directly influenced by the susceptor's temperature through electromagnetic coupling, enabling fast and accurate temperature detection without the delay associated with measuring ambient temperature and inferring susceptor temperature.
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 device accurately measures the susceptor's temperature without contact, reducing the risk of sensor damage and improving power efficiency, while providing fast and precise temperature detection.
Implementation Method 1
a first coil configured to induce heat in the susceptor by induction heating
Implementation Method 2
a second coil having a resonance frequency which varies according to a change in a temperature of the susceptor
Data Source
AI summary
An aerosol generating device includes: a susceptor configured to be inserted into an aerosol generating substrate; a first coil configured to induce heat in the susceptor by induction heating; a second coil having a resonance frequency which varies according to a change in a temperature of the susceptor; and a controller configured to calculate the temperature of the susceptor on the basis of a change in the resonance frequency of the second coil.