Aerosol Inhaler Load Resistance Sensing With Constant Current
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Solution Overview
Problem
Existing aerosol inhaler control devices require complex and large-scale circuits to accurately measure the electric resistance value and temperature of the load, often necessitating multiple voltage sensors and constant voltage output circuits, which complicates the design and increases costs.
Innovation Solution
A control device for an aerosol inhaler that includes a voltage sensor, a constant current circuit, and a control circuit to accurately acquire the electric resistance value and temperature of the load using a constant current output, simplifying the configuration and reducing the need for complex circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a constant voltage output circuit is used to measure the electric resistance value of the load, then the measurement can be performed, but the circuit scale becomes large
Solution Approach 1:
The patent changes the measurement parameter from voltage-based measurement (requiring constant voltage output circuit) to current-based measurement (using constant current circuit). By applying a constant current to the load and measuring the resulting voltage, the electric resistance can be calculated without requiring a complex constant voltage output circuit, thus reducing circuit scale while maintaining measurement capability
Solution Approach 2:
The patent substitutes the constant voltage output circuit (electrical system) with a constant current circuit combined with voltage measurement. This substitution eliminates the need for complex voltage regulation hardware while achieving the same measurement objective through a simpler electrical configuration
2Measurement precision
If a voltage dividing circuit with multiple voltage measurements is used to obtain the electric resistance value, then the measurement can be performed, but the number of voltage sensors required increases
Solution Approach 1:
The patent changes the measurement approach from measuring multiple voltages (requiring multiple voltage sensors) to measuring a single voltage while maintaining constant current. By controlling the current to be constant and measuring only the voltage across the load, the electric resistance can be determined with a single voltage sensor, significantly reducing device complexity
Solution Approach 2:
The constant current circuit automatically provides the stable current condition needed for accurate measurement, eliminating the need for external voltage division and multiple measurement points. The system self-regulates the current to remain constant, allowing single-point voltage measurement to suffice for resistance calculation
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 solution allows for highly accurate acquisition of the electric resistance value and temperature of the load with a simple configuration, reducing the size and complexity of the circuitry and costs while maintaining high precision.
Implementation Method 1
a voltage sensor configured to output a voltage value applied to the load
Implementation Method 2
a constant current circuit configured to output a constant current to the load
Implementation Method 3
a load heating an aerosol generation source
Data Source
AI summary
A control device of an aerosol inhaler includes a load heating an aerosol generation source, in which a temperature and an electric resistance value of the load are correlated. The control device includes: a voltage sensor configured to output a voltage value applied to the load; a constant current circuit configured to output a constant current to the load; and a control circuit configured to acquire the electric resistance value of the load or the temperature of the load based on output of the voltage sensor and the constant current.