Aerosol Inhaler Heating Circuit for Precise Temperature Detection
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Solution Overview
Problem
Existing aerosol inhalers lack accurate temperature control of the heating element, which is crucial for efficient aerosol generation and user safety, as they rely on measuring resistance values but do not provide a specific configuration for precise temperature detection.
Innovation Solution
The aerosol inhaler incorporates a circuit with a load, known resistors, and an operational amplifier to accurately detect the temperature of the heating element by comparing differential inputs, ensuring the heating element operates within a predetermined temperature range, preventing overheating or underheating.
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 patent introduces an operational amplifier as an intermediary component to bridge the gap between the simple resistance measurement circuit and the required temperature detection precision. The op-amp differentiator circuit converts the resistance value of the heating element into a differential voltage signal that can be accurately measured and correlated to temperature, thus achieving precise temperature detection without requiring a complex direct measurement circuit
Solution Approach 2:
The patent replaces direct electrical resistance measurement with an operational amplifier-based voltage differentiation system. By converting the resistance measurement into a voltage differential signal through the op-amp circuit, the system achieves higher measurement precision while maintaining relatively simple circuit implementation
2Productivity
If the heating element operates at high temperature for efficient aerosol generation, then productivity is improved, but harmful factors increase due to overheating risks
Solution Approach 1:
The patent implements a feedback control system where the operational amplifier continuously monitors the resistance value of the heating element and compares it against predetermined threshold values corresponding to safe operating temperatures. When the temperature approaches the upper limit, the system automatically adjusts or stops power supply to the heating element, thus maintaining high aerosol generation efficiency while preventing overheating and associated harmful effects
Solution Approach 2:
The patent establishes predetermined temperature thresholds and control parameters before operation begins. The operational amplifier is configured with reference voltages that correspond to safe operating limits, creating a protective buffer that prevents the heating element from reaching dangerous temperatures. This proactive approach ensures that even under high-power operation, the system maintains safety margins against overheating
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 configuration allows for precise temperature control of the heating element, ensuring efficient aerosol generation and user safety by maintaining the heating element within a safe and optimal temperature range, enhancing the accuracy and reliability of the aerosol inhaler.
Implementation Method 1
a load 21, which heats an aerosol source 22 and whose electric resistance value has correlation with a temperature thereof
Data Source
AI summary
An aerosol inhaler includes: a first branch circuit including a load, a first resistor, and a first node; a second branch circuit including a second resistor, a third resistor, and a second node; an operational amplifier of which a non-inverting input terminal is connected to one of the first node and the second node, and of which an inverting input terminal is connected to the other of the first node and the second node; and a control device having an upper limit temperature and a lower limit temperature. A differential input of the operational amplifier is larger than potential of a negative power supply terminal of the operational amplifier or a minimum value acquirable by the operational amplifier in a first temperature range, and is equal to the potential of the negative power supply terminal of the operational amplifier or the minimum value in a second temperature range.