Heater Control Using Resistance Feedback for Aerosol Compatibility
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Solution Overview
Problem
Existing electrically heated aerosol-generating systems struggle to operate effectively with heaters of different electrical resistances due to manufacturing tolerances and varying cartridge designs, and lack the ability to detect counterfeit or incompatible consumables.
Innovation Solution
An electrically operated aerosol-generating system that measures the initial and subsequent electrical resistance of the heater, determines differences beyond predefined thresholds, and controls power supply based on these differences to detect adverse conditions, allowing for compatibility and authenticity verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system uses a fixed threshold based on a particular heater resistance, then the temperature control is accurate for that specific heater, but the system cannot operate with heaters of different resistances
Solution Approach 1:
The system dynamically adjusts the threshold based on the measured heater resistance. Instead of using a fixed threshold, the control circuitry calculates a dynamic threshold that is proportional to the measured resistance value, allowing the system to adapt to different heater characteristics while maintaining accurate temperature control.
Solution Approach 2:
The system changes the threshold parameter based on the heater resistance measurement. The threshold is transformed from a fixed value to a variable value that scales with the heater resistance, enabling the system to work with heaters of different resistances while maintaining the same temperature control accuracy.
2Reliability
If the system stores a threshold determined at manufacture, then the temperature control is optimised for that specific heater, but the system cannot detect counterfeit or incompatible consumables
Solution Approach 1:
The system performs a preliminary measurement of the heater resistance before normal operation and uses this measurement to establish the appropriate threshold. This preliminary action allows the system to both optimize temperature control for the specific heater and verify that the heater is genuine and compatible.
Solution Approach 2:
The system uses feedback from the heater resistance measurement to adjust the threshold and detect anomalies. By continuously monitoring the heater resistance and comparing it against expected values, the system can detect counterfeit or incompatible consumables while maintaining reliable temperature control.
3Device complexity
If the system uses a fixed threshold, then the device complexity is low, but the manufacturing precision requirements increase to ensure consistent heater resistance
Solution Approach 1:
The system performs self-calibration by measuring the actual heater resistance and automatically adjusting the threshold accordingly. This self-service approach eliminates the need for high manufacturing precision while keeping the control system relatively simple, as the system adapts to each heater's specific characteristics.
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 operation with diverse heaters and consumables, preventing power supply to counterfeit or damaged components, ensuring consistent performance and user safety.
Implementation Method 1
an electric heater comprising at least one heating element for heating the liquid aerosol-forming substrate
Implementation Method 2
The system can use the electrical resistance of the heater element to calculate the temperature of the heating element
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2~3
AI summary
An electrically operated aerosol-generating system comprising a heating element, a power supply, and electric circuitry (109) connected to the heating element and to the power supply and comprising a memory, the electric circuitry being configured to: measure an initial electrical resistance of the heating element; measure a subsequent electrical resistance of the heating element after the measurement of the initial electrical resistance and between user puffs on the system; determine the difference between the initial electrical resistance and the subsequent electrical resistance; compare the difference to a cooling threshold; and when the difference is above the cooling threshold, prevent or limit the supply of power to the heating element until the difference falls below the cooling threshold.