Induction-Heated Aerosol Device Shielding for EMI Reduction
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Solution Overview
Problem
Existing aerosol generating devices emit excessive electromagnetic radiation during operation, which can interfere with nearby electronic devices and communication systems, and there is a need for devices that minimize electromagnetic interference while effectively heating aerosol-generating materials without burning them.
Innovation Solution
The device incorporates a magnetic shield member made of ferrite material that surrounds the inductive heating element, reducing electromagnetic radiation emission levels by up to 30% while maintaining efficient heating, and includes a snubber circuit in the charging apparatus to manage voltage spikes, ensuring electromagnetic radiation levels remain within predetermined limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a cartridge-type consumable container is used with a refilling structure, then the container can be refilled multiple times, but the structure becomes more complex and may compromise sealing reliability
Solution Approach 1:
The container is designed with a self-sealing mechanism where the liquid level sensor and refill structure work together automatically. When liquid is added, the sensor detects the level and the structure automatically seals, eliminating the need for complex external refilling mechanisms while enabling multiple refills.
Solution Approach 2:
The refill structure is nested within the existing container body, with the liquid level sensor integrated into the refill mechanism. This nested design allows the refilling function to be added without significantly increasing external complexity, as components are housed within the existing structure.
2Reliability
If a liquid level sensor is added to detect liquid amount, then liquid leakage is prevented, but the device complexity increases
Solution Approach 1:
The liquid level sensor is merged with the refill structure, forming an integrated assembly. The sensor is positioned within the refill mechanism itself, allowing it to detect liquid levels and trigger automatic sealing without requiring separate control systems or additional components.
Solution Approach 2:
The sensor system operates autonomously by detecting liquid levels and automatically triggering the sealing mechanism. This self-service capability eliminates the need for complex external monitoring and control systems, achieving reliable leakage prevention through simple automatic operation.
3Duration of action of stationary object
If the container structure is made more sophisticated to enable refilling, then reuse is enabled, but manufacturing complexity and cost increase
Solution Approach 1:
The container is divided into functional segments: a refillable body portion, a cap assembly with integrated sensor, and a sealing mechanism. Each segment can be manufactured separately using standard processes and then assembled, maintaining manufacturing simplicity while enabling refill functionality.
Solution Approach 2:
The cap assembly serves multiple functions: it seals the container, houses the liquid level sensor, and provides the refill interface. This multi-functionality consolidates what would otherwise require separate components, simplifying the overall manufacturing process while enabling sophisticated refill capability.
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 solution effectively reduces electromagnetic radiation emissions to safe levels, protecting both the device and surrounding electronics, while ensuring efficient heating and charging operations, thus minimizing interference and maintaining device functionality.
Implementation Method 1
a heating unit configured to heat the liquid in the container
Implementation Method 2
an ultrasonic vibration unit configured to vibrate the liquid in the container
Data Source
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AI summary
An aerosol generating device comprises an induction heating circuit for inductively heating a susceptor arrangement to heat an aerosol generating material to thereby generate an aerosol. The device is configured such that during operation a level of electromagnetic radiation emitted by the device is: less than 40dBµV/m over a frequency range of 30MHz to 225MHz and/or less than 47dBµV/mover a frequency range of 235MHz to 1GHz, and/or less than 70dBµV/mover a frequency range of 1GHz to 3GHz, and/or less than 74dBµV/mover a frequency range of 3GHz to 6GHz.