Inductive Heater Article Detection in Aerosol-Generating Devices
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Solution Overview
Problem
Existing aerosol-generating devices require separate sensor means for detecting the insertion or extraction of an aerosol-generating article, which consume energy and reduce operation time.
Innovation Solution
Utilize an inductive heating arrangement to detect the presence or absence of a susceptor within the device by monitoring changes in electrical and magnetic properties, eliminating the need for separate sensors and reducing power consumption through pulsed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate sensor means are used to detect article insertion or extraction, then detection reliability is improved, but device complexity increases and operation time decreases due to additional energy consumption
Solution Approach 1:
The inductive heating arrangement is designed to serve dual purposes: heating the aerosol-forming substrate during normal operation and detecting the presence or absence of the susceptor through monitoring of electrical properties. This multi-functionality eliminates the need for separate sensor means, thereby maintaining detection reliability while reducing energy consumption and extending operation time.
Solution Approach 2:
The detection function is merged with the heating function by using the same inductive heating arrangement for both purposes. The control circuitry monitors changes in electrical properties of the heating arrangement to detect article insertion or extraction, combining what were previously separate functions into one integrated system.
2Reliability
If separate sensor means are used for detection, then detection capability is improved, but energy consumption increases
Solution Approach 1:
The inductive heating arrangement performs both heating and detection functions, eliminating the need for additional sensor means that would consume extra energy. The system uses the existing heating circuitry to monitor electrical property changes for detection purposes.
Solution Approach 2:
The heating arrangement monitors its own electrical properties to detect the presence or absence of the susceptor, rather than requiring a separate detection system. This self-monitoring capability enables detection without the additional energy consumption associated with separate sensors.
3Reliability
If continuous sensor operation is implemented, then detection reliability is improved, but power consumption increases significantly
Solution Approach 1:
The control circuitry operates in a periodic manner by monitoring the electrical properties of the inductive heating arrangement at appropriate intervals during heating operations. This periodic monitoring maintains detection reliability while significantly reducing power consumption compared to continuous sensor operation.
Solution Approach 2:
The system uses the heating arrangement's own electrical property changes as the detection signal, eliminating the need for separate continuous sensing. The monitoring leverages the existing heating cycle to detect article presence, reducing overall power consumption.
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 efficient detection of article insertion or extraction while minimizing power consumption, extending device operation time and improving user convenience by automating heating initiation and preventing re-use of depleted articles.
Implementation Method 1
an inductive heating arrangement connected to the DC power supply and configured to generate an alternating magnetic field within the cavity for inductively heating the susceptor of the article
Implementation Method 2
an inductive heating arrangement connected to the DC power supply and configured to generate an alternating magnetic field within the cavity for inductively heating the susceptor
Implementation Method 3
detect a change of at least one property of the inductive heating arrangement due to the susceptor becoming present within or absent from within the cavity
Data Source
AI summary
An aerosol-generating device is provided for heating an aerosol-forming substrate that is capable to form an inhalable aerosol when heated. The device includes control circuitry configured to generate power pulses for intermittently powering on the inductive heating arrangement and detect at least one of insertion of an article into the cavity or extraction of an article from the cavity in response to detecting a change of an inductive heating arrangement due to a susceptor becoming present within or absent from a cavity. The control circuitry either (A) includes a motion sensor and starts generating power pulses in response to detecting a movement of the device, or (B) detects the extraction of the aerosol-generating device from a power charging unit and starts generating the power pulses in response to detecting the extraction.