Aerosol Heater Current Feedback for Sensorless Temperature Control
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Solution Overview
Problem
Existing aerosol generating devices lack accurate temperature control of heaters without temperature sensors, affecting the uniformity of aerosol generation.
Innovation Solution
An aerosol generating device with a controller that calculates and measures current flowing through a heater, estimates temperature based on differences, and adjusts power supply using a lookup table correlating current differences with temperature values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no temperature sensor is used in the aerosol generating device, then device complexity is reduced, but temperature control precision deteriorates
Solution Approach 1:
The patent replaces the physical temperature sensor (mechanical/physical measurement system) with an electrical measurement system that calculates temperature based on current differences. The controller measures the difference between calculated current (based on predefined resistance and power) and measured current flowing through the heater, then estimates temperature from this difference without requiring a temperature sensor.
Solution Approach 2:
The patent introduces current measurement as an intermediary parameter to indirectly determine temperature. Instead of directly measuring temperature with a sensor, the system measures current flow characteristics and uses the current difference as a mediator to estimate temperature, thereby avoiding the need for a temperature sensor while maintaining temperature control capability.
2Device complexity
If temperature control is not accurately implemented, then device complexity is reduced, but aerosol generation uniformity deteriorates
Solution Approach 1:
The patent implements a feedback control mechanism where the controller continuously monitors the current difference and adjusts power supply to the heater based on this feedback. The controller compares the measured current with the calculated current, determines the temperature from their difference, and adjusts power accordingly to maintain uniform aerosol generation, creating a closed-loop control system without requiring a temperature sensor.
Solution Approach 2:
The patent changes the control parameter from direct temperature measurement to current difference measurement. By monitoring changes in current flow characteristics rather than temperature directly, the system achieves accurate temperature control and uniform aerosol generation while simplifying the device structure through parameter substitution.
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
Enables precise temperature estimation and control of the heater without a separate temperature sensor, ensuring a uniform smoking experience.
Implementation Method 1
a heater configured to heat an aerosol generating material to generate aerosol
Implementation Method 2
measure the current flowing through the heater
Data Source
AI summary
An aerosol generating device includes a heater configured to heat an aerosol generating material to generate aerosol; a controller configured to: calculate a current flowing through the heater based on a predefined resistance of the heater and power supplied to the heater, measure the current flowing through the heater, and control the power supplied to the heater based on a difference between the calculated current and the measured current.