HNB Heater Power Control for Fast Preheat Without Combustion
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Solution Overview
Problem
Existing heat-not-burn (HNB) aerosol-generating devices face challenges in efficiently controlling heater temperatures to prevent combustion of plant materials while ensuring consistent and controlled release of constituents.
Innovation Solution
A system for controlling a heater in a non-combustible aerosol-generating device, utilizing a controller to apply a first power based on a preheat temperature and an energy threshold, adjusting power levels based on estimated energy applied to the heater, and using voltage and current measurements to determine and adjust power settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high power is applied to the heater to rapidly heat the plant material, then heating speed is improved, but the risk of combustion increases
Solution Approach 1:
The system dynamically adjusts heater power based on real-time temperature feedback and preheat stage detection. During the preheat stage, the controller applies a first power level to rapidly increase temperature, then transitions to a second power level when the target temperature is approached, preventing combustion while maintaining heating efficiency
Solution Approach 2:
The controller continuously monitors heater temperature and adjusts power application accordingly. Temperature sensors provide feedback to the control system, which modulates the power supply to maintain temperature within the safe operating range below the combustion point, resolving the contradiction between rapid heating and combustion prevention
2Reliability
If temperature is controlled below combustion point to prevent pyrolysis, then safety is improved, but the energy required to maintain temperature increases
Solution Approach 1:
The system performs preliminary heating to a target temperature below the combustion point before aerosol generation begins. This preheat stage establishes thermal conditions that enable efficient aerosol formation while maintaining safety margins, reducing the energy required during subsequent operation
Solution Approach 2:
The controller employs periodic heating cycles with distinct power levels. During preheat phases, higher power is applied to reach target temperature quickly, then power is reduced to maintenance levels. This periodic modulation of power application reduces overall energy consumption while maintaining safety
3Manufacturing precision
If power is adjusted based on multiple parameters (temperature, energy, voltage), then control precision is improved, but device complexity increases
Solution Approach 1:
The controller integrates multiple measurement functions (temperature sensing, voltage monitoring, energy calculation) into a single multi-functional device. By consolidating these functions in one control unit, the system achieves high control precision without proportionally increasing overall device complexity
Solution Approach 2:
The system combines temperature control, power regulation, and energy management into a unified control algorithm. Multiple parameters are processed together to determine power adjustment decisions, achieving precise control while minimizing the number of separate control systems needed
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 system effectively manages heater temperatures below 320°C, preventing combustion and ensuring consistent release of aerosol constituents, enhancing user safety and device performance.
Implementation Method 1
Some electronic devices are configured to heat a plant material to a temperature that is sufficient to release constituents of the plant material while keeping the temperature below a combustion point
Data Source
AI summary
At least one example embodiment provides a system for controlling a heater in a non-combustible aerosol-generating device, the system comprising a memory storing computer-readable instructions and a controller configured to execute the computer-readable instructions to cause the non-combustible aerosol-generating device to apply a first power to the heater based on a first preheat temperature determine an estimated energy applied to the heater during application of the first power, and apply a second power to the heater based on the estimated energy, an energy threshold and a second preheat temperature, the second power being less than the first power.