Aerosol Inhaler Power Supply Temperature Detection Circuit
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Solution Overview
Problem
Existing aerosol inhaler power supply units lack accurate temperature detection of the load used to generate aerosols, which affects the efficiency and quality of aerosol generation.
Innovation Solution
A power supply unit configuration that includes a first element connected in series with the load, a second series circuit, and operational amplifiers to accurately detect temperature by correlating electric resistance values, preventing differential input clipping and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple resistance measurement circuit is used, then the device complexity is reduced, but the temperature detection precision deteriorates
Solution Approach 1:
The measurement circuit is segmented into multiple functional blocks: a bridge circuit for resistance measurement, operational amplifiers for signal amplification, and a potential adjustment circuit for offset correction. This segmentation allows each block to perform its specific function optimally, achieving high precision temperature detection while keeping each individual block relatively simple.
Solution Approach 2:
Operational amplifiers are introduced as intermediary components between the bridge circuit and the microcontroller. These amplifiers amplify the small voltage signals from the bridge circuit, enabling accurate measurement of the load's resistance changes. The potential adjustment circuit acts as another intermediary to correct systematic errors in the measurement.
2Measurement precision
If the differential input range of the operational amplifier is increased, then the temperature detection precision is improved, but the risk of clipping increases
Solution Approach 1:
The potential adjustment circuit dynamically adjusts the differential input voltage to keep it within the operational amplifier's safe range. By adding or subtracting a predetermined potential based on the measured values, the system adapts to different operating conditions and prevents clipping while maintaining measurement precision.
Solution Approach 2:
The microcontroller continuously monitors the measured values and adjusts the potential adjustment circuit's output to maintain the differential input within the optimal range. This feedback mechanism ensures that the operational amplifier operates reliably without clipping while achieving high measurement precision.
3Reliability
If strict design constraints on electric resistance values are imposed, then the measurement reliability is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The potential adjustment circuit changes the operating parameters of the measurement system by adding a predetermined potential offset. This allows the system to accommodate a wider range of electric resistance values in the load without compromising measurement reliability, thereby easing manufacturing constraints.
Solution Approach 2:
The bridge circuit is designed with resistors that can accommodate variations in load resistance. By using a bridge configuration with adjustable resistor values, the system can reliably measure a wide range of resistance values, providing manufacturing flexibility while maintaining measurement accuracy.
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 enables high-accuracy temperature detection of the load, improving aerosol generation efficiency and quality by preventing clipping and relaxing design constraints on electric resistance values.
Implementation Method 1
a load 21 which is configured to heat an aerosol generation source 22 and has a correlation between temperature and electric resistance values
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A power supply unit for an aerosol inhaler includes: a first series circuit ; a second series circuit connected in parallel with the first series circuit; a first operational amplifier including a non-inversion input terminal connected to one of a first node and a second node, and an inversion input terminal connected to the other of the first node and the second node; and an adjustment circuit connected to the first operational amplifier and configured to prevent a differential input value of the first operational amplifier from being equal to a potential of a negative power supply terminal of the first operational amplifier or a minimum value acquirable by the first operational amplifier, in a state where a potential of the node connected to the non-inversion input terminal is less than a potential of the node connected to the inversion input terminal.