Dual-Thermistor Heater Control for Aerosol Power Supply Safety
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Solution Overview
Problem
Existing aerosol generating devices face challenges in accurately controlling the temperature of their heaters, which is crucial for efficient flavoring and aerosol production, but current solutions lack precision and safety features to prevent overheating.
Innovation Solution
A power supply unit with a controller using two thermistors to regulate heater temperature, converging it to a target temperature and incorporating a protection circuit to stop power supply when the heater reaches a high threshold, ensuring accurate temperature control and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single thermistor is used for temperature sensing, then the device complexity is low, but the temperature control precision and safety are insufficient
Solution Approach 1:
The temperature sensing function is segmented into two separate thermistors: a first thermistor for temperature measurement and control, and a second thermistor for safety protection. This segmentation allows each thermistor to specialize in its function, improving overall temperature control precision while maintaining reasonable device complexity through clear functional division.
Solution Approach 2:
The controller acts as an intermediary that processes signals from both thermistors and coordinates the heater control accordingly. It integrates information from the first thermistor for normal operation and the second thermistor for safety monitoring, enabling precise temperature control with enhanced safety without requiring direct mechanical intervention.
2Manufacturing precision
If temperature control is simplified, then the device complexity is low, but the aerosol quality consistency deteriorates
Solution Approach 1:
The system implements feedback control using the first thermistor to continuously monitor heater temperature and adjust power supply accordingly. This feedback mechanism ensures consistent aerosol quality by maintaining precise temperature control, while the controller integrates this feedback efficiently to avoid excessive complexity.
3Reliability
If no protection circuit is added, then the device complexity is low, but the safety against overheating is insufficient
Solution Approach 1:
The second thermistor is positioned to detect temperature trends before dangerous overheating occurs. By performing preliminary temperature monitoring and triggering protection before critical thresholds are reached, the system ensures safety against overheating while keeping the protection mechanism simple and integrated into the existing control architecture.
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 provides precise temperature control for the heater, ensuring consistent aerosol quality and safety by preventing overheating, thus enhancing the performance and reliability of aerosol generating devices.
Implementation Method 1
a first thermistor whose resistance value changes according to a temperature of the heater
Implementation Method 2
a second thermistor whose resistance value changes according to the temperature of the heater and which is different from the first thermistor
Implementation Method 3
a heater configured to heat a flavor source for flavoring an aerosol
Data Source
AI summary
A power supply unit for an aerosol generating device including: a power supply; a heater configured to heat a flavor source for flavoring an aerosol; a first thermistor whose resistance value changes according to a temperature of the heater; a second thermistor whose resistance value changes according to the temperature of the heater and which is different from the first thermistor; a controller configured to control, based on the temperature of the heater obtained based on the resistance value of the second thermistor, supply of power from the power supply to the heater such that the temperature of the heater converges to a target temperature; and a protection circuit configured to stop the supply of power from the power supply to the heater when the temperature of the heater obtained based on the resistance value of the first thermistor is equal to or higher than a first threshold.