Vapour Heater Voltage Control for Gradual Dry-Out Indication
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Solution Overview
Problem
Existing vapor provision systems, such as electronic cigarettes, face issues when the vapor precursor material runs out, leading to rapid overheating of the heating element, which can damage components and produce unpleasant tastes due to decomposed substances, and existing solutions often require complex circuitry to monitor temperature.
Innovation Solution
A control circuitry system that supplies a constant average voltage power to the heating element regardless of its temperature, balancing the rate of vaporization with the rate of precursor material replenishment to provide a gradual indication of dry out through controlled taste changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature monitoring circuitry is added to prevent overheating, then component damage is prevented, but device complexity increases
Solution Approach 1:
The system uses the existing heating element's electrical resistance as a natural temperature indicator without requiring external sensors. The control circuitry monitors the inherent change in resistance of the heating element itself, allowing the component to serve its own diagnostic function and eliminating the need for separate temperature sensing components.
Solution Approach 2:
The patent replaces complex mechanical or electronic temperature sensing systems with an electrical measurement approach. By measuring the electrical resistance of the heating element, which naturally changes with temperature, the system substitutes a simple electrical measurement for what would otherwise require complex temperature monitoring hardware.
2Temperature
If complex temperature monitoring is implemented, then overheating is detected, but manufacturing cost increases
Solution Approach 1:
The heating element serves dual purposes: heating the liquid and providing temperature information through its electrical resistance. This self-service approach eliminates the need for separate temperature sensing components, simplifying manufacturing and reducing costs while still enabling overheating detection.
Solution Approach 2:
The heating element is made multi-functional by using it both for its primary heating purpose and as a temperature sensor. Its electrical resistance serves as an inherent temperature indicator, allowing one component to perform multiple functions and reducing the overall component count and manufacturing complexity.
3Productivity
If constant power is supplied regardless of temperature, then vaporization rate remains stable, but overheating risk increases when liquid is depleted
Solution Approach 1:
The system implements feedback control by continuously monitoring the electrical resistance of the heating element and using this information to adjust the power supply. When resistance increases indicating temperature rise or liquid depletion, the control circuitry responds by reducing power, preventing overheating while maintaining stable vaporization during normal operation.
Solution Approach 2:
The power supply to the heating element is made dynamic rather than static. The system adjusts power levels in real-time based on temperature feedback from the heating element's resistance changes, allowing the system to adapt to changing conditions and prevent overheating while maintaining optimal vaporization during normal operation.
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 approach allows users to detect dry out without complex temperature monitoring, reducing system damage and providing a gradual, noticeable taste change, thus prompting replacement without harsh flavors or component harm.
Implementation Method 1
a wick for transporting liquid vapour precursor material from a reservoir to the heating element
Implementation Method 2
a heating element for generating vapour from a liquid vapour precursor material
Data Source
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AI summary
Disclosed is a vapour provision system comprising a heating element for generating vapour from a liquid vapour precursor material and a wick for transporting liquid vapour precursor material from a reservoir to the heating element. The vapour provision system further comprises a user activation mechanism for signalling the user's intent to start vapour generation and configured to be actuated by a user and control circuitry configured to supply a constant average voltage power to the heating element in response to a signal output from the user activation mechanism. The control circuitry is configured to supply the constant average voltage power to the heating element regardless of the temperature of the heating element.