Inhaler Controller Dual Voltage Heater Resistance Measurement
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Solution Overview
Problem
Existing inhaler systems face challenges in maintaining accurate temperature control of the heater element due to changes in the voltage supply, which affects the heating and measurement processes, leading to inefficiencies in aerosol generation and delivery.
Innovation Solution
The inhaler controller employs a dual voltage system with a measurement circuit and a differential amplifier to measure the resistance value of the heater, allowing for independent control of heating and measurement voltages, and includes a cutoff unit to manage voltage differences, ensuring accurate temperature control and aerosol delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common power-supply line is used for both heating and temperature measurement of the heater, then the device complexity is reduced, but the measurement precision deteriorates due to voltage changes affecting the heating and measurement processes
Solution Approach 1:
The patent divides the power supply system into two separate paths: a first path (heating path) connecting the first voltage terminal to the heater, and a second path (measurement path) connecting the second voltage terminal to the heater through a resistor. This segmentation allows independent control of heating and measurement voltages, resolving the contradiction by enabling precise temperature measurement while maintaining heating functionality.
Solution Approach 2:
The patent introduces a resistor as an intermediary element in the measurement path, connected in series with the heater between the second voltage terminal and the connection terminal. This resistor enables the measurement of voltage drop across the heater without directly affecting the heating process, thereby achieving accurate temperature measurement independent of heating voltage fluctuations.
2Adaptability or versatility
If the voltage supplied to the heater is changed to adjust heating mode, then the adaptability is improved, but the measurement precision deteriorates as the calculation formula for converting voltage to temperature must be changed
Solution Approach 1:
The patent separates the heating voltage control from the measurement voltage control by providing two independent voltage terminals. The first voltage terminal controls the heating mode adaptability, while the second voltage terminal maintains a stable reference voltage for accurate temperature measurement, eliminating the need to recalculate conversion formulas when heating modes change.
Solution Approach 2:
The patent establishes a stable reference potential at the second voltage terminal that remains constant regardless of changes in the first voltage terminal. This equipotential reference enables consistent and accurate temperature measurements even when the heating voltage varies across different operating modes.
3Measurement precision
If a dual voltage system with separate paths is used for heating and measurement, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent makes the heater serve dual functions: it acts as both the heating element in the first path and the sensing element in the second path. By utilizing the heater's resistance change with temperature for measurement purposes, the patent achieves precise temperature sensing without adding separate temperature sensors, thereby reducing overall device complexity.
Solution Approach 2:
The patent combines the heating function and temperature sensing function into a single integrated system where the heater itself serves as the temperature sensor. The resistance of the heater is measured through the second path to determine temperature, merging two functions into one component to minimize additional complexity.
4Manufacturing precision
If the heater resistance is measured during operation, then the temperature control accuracy is improved, but harmful factors increase due to current flow between different voltage paths
Solution Approach 1:
The patent acknowledges the potential harm of current flow between voltage paths but converts it into a beneficial measurement mechanism. By intentionally measuring the voltage drop across the heater in the second path, the system uses the current flow to obtain accurate resistance and temperature information, transforming a potential harmful effect into a useful measurement signal.
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 enhances the system's adaptability to voltage changes, improving the accuracy and efficiency of aerosol generation and delivery by maintaining consistent temperature control of the heater, regardless of voltage fluctuations.
Implementation Method 1
a heater (HT) configured to heat an aerosol source
Implementation Method 2
a measurement circuit configured to measure a resistance value of the heater
Data Source
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AI summary
An inhaler controller includes a first path configured to connect a first voltage terminal to which a first voltage is supplied and a connection terminal to which a heater configured to heat an aerosol source is connected, a second path configured to connect a second voltage terminal to which a second voltage different from the first voltage is supplied and the connection terminal via a resistor, and a measurement circuit configured to measure a resistance value of the heater.