Induction-Heated Aerosol Generator With Magnetic EMI Shielding
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Solution Overview
Problem
Existing aerosol generating devices, such as heating devices for tobacco, emit significant electromagnetic radiation during operation, which can interfere with other electronic devices and pose environmental concerns, and there is a need to minimize these emissions while maintaining effective heating of aerosol generating materials without burning them.
Innovation Solution
The aerosol generating device incorporates an induction heating circuit with a magnetic shield member and a charging apparatus that limits electromagnetic radiation emissions to specific frequency ranges, using a snubber circuit to manage voltage spikes during charging, and a magnetic shield member to reduce radiation exposure and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an induction heating circuit is used to heat aerosol generating material, then heating effectiveness is improved, but electromagnetic radiation emissions increase
Solution Approach 1:
A magnetic shield member is introduced as an intermediary component between the induction heating circuit and the surrounding environment. This magnetic shield absorbs and redirects electromagnetic radiation, preventing it from propagating outward while allowing the heating function to continue uninterrupted. The magnetic shield thus mediates between the heating requirement and the radiation emission problem.
Solution Approach 2:
The patent converts the harmful electromagnetic radiation by redirecting it through the magnetic shield toward the aerosol generating material. The radiation that would otherwise be wasted or harmful is instead focused to improve heating efficiency of the material, transforming a harmful byproduct into a useful heating contribution.
2Object-generated harmful factors
If a magnetic shield member is added to reduce electromagnetic radiation, then radiation emissions are reduced, but device complexity increases
Solution Approach 1:
The magnetic shield member is implemented as a thin-walled cylindrical structure that can be easily integrated into the existing device architecture. This thin-film approach provides effective electromagnetic shielding without adding significant bulk or complexity to the device. The shield's simple cylindrical geometry allows for straightforward manufacturing and assembly.
3Reliability
If a snubber circuit is added to limit voltage spikes during charging, then operational safety is improved, but device complexity increases
Solution Approach 1:
The snubber circuit is designed to anticipate and cushion against voltage spikes before they can cause damage. By providing a controlled discharge path for voltage transients, the snubber circuit prevents harmful voltage spikes from occurring in the first place, thereby improving operational safety without requiring complex protective mechanisms.
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 effectively heats aerosol generating materials while minimizing electromagnetic radiation emissions below predetermined levels, reducing interference with other devices and environmental impact, and ensuring safe operation during charging and use.
Implementation Method 1
an induction heating circuit for inductively heating a susceptor arrangement to heat an aerosol generating material to thereby generate an aerosol
Implementation Method 2
The inductive element may be an inductor coil extending around the receptacle
Implementation Method 3
The device may comprise a magnetic shield member configured to extend at least partially around the inductive heating circuit or the susceptor arrangement
Data Source
AI summary
An aerosol generating device includes 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 40 dBμV/m over a frequency range of 30 MHz to 225 MHz and/or less than 47 dBμV/m over a frequency range of 235 MHz to 1 GHz, and/or less than 70 dBμV/m over a frequency range of 1 GHz to 3 GHz, and/or less than 74 dBμV/m over a frequency range of 3 GHz to 6 GHz.