Heater Resistance Feedback Control in Inhalation Atomizers
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Solution Overview
Problem
Existing inhalation devices struggle to maintain the optimal temperature of the heater within a specific range to ensure appropriate aerosol generation and flavor delivery, leading to insufficient or excessive aerosol production and unintended flavor release.
Innovation Solution
An inhalation device controller that includes a control circuit to monitor and regulate the heater temperature within the range of 210° C. to 230° C. by adjusting power supply based on resistance changes, using operational amplifiers and microcontrollers to maintain precise temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the heater temperature is increased to generate sufficient aerosol, then aerosol production increases, but unintended flavor release and excessive aerosol production occur
Solution Approach 1:
The patent implements feedback control by monitoring the heater's resistance value, which correlates with temperature, and adjusting power supply accordingly. The control circuit compares the monitored resistance against predetermined thresholds to dynamically regulate power delivery, ensuring the heater maintains optimal temperature range for aerosol generation without exceeding it and causing harmful effects.
Solution Approach 2:
The patent utilizes the change in resistance value of the heater as a parameter that correlates with temperature. By monitoring this electrical parameter and using it to control power supply, the system indirectly controls the thermal state of the heater, maintaining it within the optimal range for aerosol generation while preventing overheating that would cause unintended flavor release.
2Object-generated harmful factors
If the heater temperature is decreased to prevent excessive aerosol production, then flavor release is controlled, but insufficient aerosol generation occurs
Solution Approach 1:
The feedback control mechanism continuously monitors heater resistance and adjusts power supply to maintain temperature within the optimal range. This prevents both insufficient heating (which would reduce aerosol generation) and excessive heating (which would cause harmful effects), by dynamically responding to actual heater conditions.
Solution Approach 2:
The control system dynamically adjusts power supply based on real-time resistance measurements rather than using fixed temperature settings. This dynamic control allows the system to adapt to changing conditions and maintain optimal aerosol generation while preventing harmful effects, balancing the contradictory requirements of sufficient heating and controlled output.
3Device complexity
If simple on/off control is used for the heater, then device complexity is reduced, but temperature precision and aerosol consistency deteriorate
Solution Approach 1:
The patent employs feedback control where the control circuit continuously monitors the heater's resistance value and adjusts power supply accordingly. This feedback mechanism enables precise temperature control without requiring complex hardware, as it utilizes the existing electrical characteristics of the heater (resistance-temperature relationship) for monitoring and control.
Solution Approach 2:
The patent replaces direct temperature sensing and control mechanisms with an electrical resistance-based monitoring system. By substituting thermal measurement with electrical measurement (monitoring resistance changes), the system achieves precise temperature control while maintaining relatively simple device architecture, avoiding the need for complex thermocouples or thermal sensors.
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 controller ensures consistent aerosol generation and flavor delivery by maintaining the heater temperature within the optimal range, preventing both insufficient and excessive aerosol production and unintended flavor release.
Implementation Method 1
a heater, and a transport portion configured to transport the aerosol source from the container to a heating area by the heater
Implementation Method 2
monitor a resistance value of the heater or a value correlated with a temperature of the heater
Data Source
AI summary
An inhalation device controller is configured to control an atomizer including a container configured to hold an aerosol source of a liquid, a heater, and a transport portion configured to transport the aerosol source from the container to a heating area by the heater. The controller includes a control circuit configured to monitor a physical amount correlated with a temperature of the heater and configured to control power to be supplied to the atomizer such that the physical amount under monitoring approaches a target value. The target value is set such that the temperature of the heater during heating of the aerosol source falls within a range of 210° C. to 230° C.