Aerosol Heater Power-Signal Puff Detection Without Separate Sensors
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Solution Overview
Problem
Aerosol generating devices struggle to accurately detect a user's puff, which is necessary for adjusting heating profiles and counting the number of remaining puffs.
Innovation Solution
The device incorporates a heater, a temperature sensor, and a controller that uses a power signal to detect puffs by filtering the signal through a band-pass filter, setting a bandwidth based on average puff time, and comparing the filtered signal to a preset threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate puff sensor is used to detect user puffs, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the puff detection function with the existing power signal processing system. The controller detects puffs by analyzing variations in the power signal consumed by the heater during normal operation, merging two functions (heating control and puff detection) into a single integrated system, thereby eliminating the need for a separate puff sensor
Solution Approach 2:
The power signal serves multiple purposes: it controls the heater operation and simultaneously provides information for puff detection. By making the power signal multi-functional, the system achieves accurate puff detection without adding dedicated detection hardware, thus reducing device complexity while maintaining detection accuracy
2Measurement precision
If filtering is applied to the power signal, then puff detection accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The patent applies filtering operations to the power signal to extract puff detection information while removing noise and irrelevant variations. By carefully selecting filter parameters and types suitable for the specific application, the system achieves accurate puff detection with manageable signal processing complexity
Solution Approach 2:
The patent replaces complex mechanical or hardware-based puff detection mechanisms with electronic signal processing. By using software-based filtering and analysis of the power signal, the system achieves accurate puff detection with simpler overall device architecture, substituting electronic processing for more complex alternative approaches
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
This method allows for accurate detection of user puffs without a separate puff sensor, enhancing the device's ability to adjust heating profiles and count puffs effectively.
Implementation Method 1
a heater that heats an aerosol generating substrate
Implementation Method 2
filter the power signal
Data Source
AI summary
An aerosol generating device includes a heater that heats an aerosol generating substrate, a temperature sensor that detects a temperature of the heater, and a controller that controls power supplied to the heater through a power signal such that the heater is heated within a preset temperature range, filters the power signal, and detects a user's puff based on the filtered power signal. Accordingly, the aerosol generating device according to the present disclosure may more accurately detect a user's puff.