Vaping Control Device Voltage Ratio Temperature Monitoring
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Solution Overview
Problem
There is a technical challenge in devising temperature monitoring schemes for electronic cigarette heating elements with minimal on-package electronics, given the variability in resistances and temperature coefficients of resistance across different brands and materials.
Innovation Solution
A control device with electronic circuitry that supplies power to a heating element, transmits a reference signal, and determines the operational temperature of the heating element by analyzing the responsive voltage ratio, ensuring operation below a target temperature, which is typically the boiling point of the vaping liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If temperature monitoring schemes are implemented for heating elements with minimal on-package electronics, then device complexity is reduced, but measurement precision deteriorates due to variability in resistances and temperature coefficients of resistance across different brands and materials
Solution Approach 1:
The patent changes the measurement approach from directly measuring absolute resistance values to measuring voltage ratios (Vout/Vref). This parameter transformation eliminates the need to account for variations in resistance values and temperature coefficients across different heating elements, achieving accurate temperature monitoring without requiring precise knowledge of each element's electrical characteristics.
Solution Approach 2:
The patent introduces a reference voltage (Vref) as an intermediary element in the measurement circuit. By comparing the output voltage (Vout) from the heating element against this stable reference, the system can determine temperature through voltage ratios rather than absolute resistance measurements, thereby simplifying the electronics while maintaining measurement accuracy.
2Ease of manufacture
If packaged vaping sources are designed for disposable use with minimal electronics, then ease of manufacture is improved, but reliability deteriorates due to lack of temperature control and monitoring capabilities
Solution Approach 1:
The patent enables the heating element to self-report its temperature state through its inherent electrical properties (resistance changes with temperature). The simple voltage division circuit uses the heating element's own resistance as the sensing element, eliminating the need for separate temperature sensors or complex control electronics in the disposable cartridge, thereby maintaining ease of manufacture while achieving reliable temperature monitoring.
Solution Approach 2:
The heating element serves multiple functions: it acts as both the heating source and the temperature sensor. By utilizing the same component for both heating and sensing, the patent eliminates the need for additional electronics in the packaged vaping source, simplifying manufacturing while ensuring reliable temperature control through the voltage ratio measurement approach.
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 control device effectively manages the heating element's temperature, preventing over-temperature operations and ensuring efficient and safe vaping by maintaining the heating element at or below the target temperature, thereby extending the lifespan of vaping sources and minimizing waste.
Implementation Method 1
A typical electronic cigarette comprises a heating element which is to heat up a flavor source, which is commonly known as a vaping source, to generate a flow of aerosols during operations
Implementation Method 2
the resistances and the temperature coefficients of resistance are variable
Data Source
AI summary
A control device for controlling operation of a vaping apparatus. The control device comprises control circuitry to control activation of the vaping source, measurement circuitry to obtain a temperature-dependent parameter of the vaping source, and memory circuitry for data storage. The control device is configured to determine the ambient temperature, to obtain the parameter at the ambient temperature as an initial parameter, to set and store a target parameter for stopping activation of the vaping source, and to stop activation of the vaping source when the target parameter has been reached.