Susceptor Temperature Sensing via Inductive Coil Power Detection
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Solution Overview
Problem
Existing aerosol generating devices face challenges in accurately measuring the temperature of a susceptor using contact or non-contact methods, leading to measurement errors and device size limitations.
Innovation Solution
An aerosol generating device and system that calculates susceptor temperature based on AC power detected by an inductive coupling phenomenon between a coil and the susceptor, utilizing a look-up table for accurate temperature determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a contact method with a temperature sensor attached to the susceptor is used, then the temperature can be measured, but the temperature sensor cannot be separated from the susceptor and must be fixed to the aerosol generating device, causing measurement errors when attached or detached
Solution Approach 1:
The patent extracts the temperature measurement function from physical contact with the susceptor by using an infrared temperature sensor that measures temperature remotely through thermal radiation. This eliminates the need to attach or detach temperature sensors from the susceptor, removing the source of measurement errors while maintaining measurement capability
Solution Approach 2:
The patent introduces an infrared temperature sensor as an intermediary that measures the susceptor temperature indirectly through thermal radiation without direct contact. This intermediary approach allows temperature measurement while avoiding the problems of sensor attachment and detachment
2Ease of operation
If a non-contact method using an infrared temperature sensor is used, then the temperature can be measured without contact, but contamination on the sensor surface or focal length considerations prevent accurate measurement and device miniaturization
Solution Approach 1:
The patent replaces the mechanical/optical system of infrared temperature sensing with an electromagnetic induction-based measurement system. By detecting AC power changes in the coil caused by inductive coupling with the susceptor, the system eliminates the need for optical paths and physical sensors that are susceptible to contamination and focal length limitations
Solution Approach 2:
The patent changes the measurement parameter from optical/thermal detection to electrical parameter detection (AC power). By monitoring changes in AC power consumed by the coil due to inductive coupling with the susceptor, the system achieves temperature measurement through electrical parameter changes rather than optical methods
3Ease of operation
If a non-contact method using an infrared temperature sensor is used, then the temperature can be measured without contact, but the device size cannot be reduced due to focal length requirements
Solution Approach 1:
The patent replaces the optical/mechanical infrared sensing system with an electromagnetic field-based measurement system. The coil-based inductive measurement requires minimal space compared to infrared sensors with required focal lengths, enabling device miniaturization while maintaining non-contact measurement capability
Solution Approach 2:
The patent transitions from optical dimension (infrared measurement requiring focal length space) to electromagnetic induction dimension (coil-based measurement). This dimensional change allows temperature measurement without the spatial constraints of optical focal lengths, enabling compact device design
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
Enables accurate temperature measurement of the susceptor while reducing device size by using AC power detection and a look-up table, minimizing measurement deviations and enhancing miniaturization.
Implementation Method 1
when an AC voltage is applied to a coil, a magnetic field is generated by the coil, and a temperature of a susceptor increases due to the magnetic field
Implementation Method 2
an induction heating method using a coil and a susceptor is used to heat cigarettes (or aerosol generating articles)
Implementation Method 3
detect AC power caused by an inductive coupling phenomenon between the coil and the susceptor
Data Source
AI summary
An aerosol generating device includes a heater including a coil and a susceptor, an alternating current detector configured to detect alternating current power caused by an inductive coupling phenomenon between the coil and the susceptor, a memory storing a look-up table including temperature matching data of the susceptor corresponding to the alternating current power, and a controller configured to calculate a temperature of the susceptor based on the alternating current power received from the alternating current detector and the look-up table.