Plug-In Fragrance Diffuser With PWM Heater Control
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Solution Overview
Problem
Conventional plug-in wick-based vapor emanation systems provide non-uniform fragrance distribution due to olfactory fatigue, non-linear dissipation rates, and inability to control fragrance levels, leading to overwhelming or weak scent in different spaces.
Innovation Solution
A fragrance dispenser with a controller that delivers pulse-width-modulated electrical voltage to a heater, allowing for variable power output and heat profiles, enabling controlled fragrance dispersion through user input and scheduled settings, and integrating with sensors for ambient light and odor detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wick-based vapor emanation systems maintain constant wattage of the heating device, then the heating function is simple and reliable, but the fragrance dissipation rate becomes non-linear and non-uniform due to olfactory fatigue and varying fragrance types
Solution Approach 1:
The heating device transitions from constant wattage to variable wattage operation, dynamically adjusting power levels based on usage time and fragrance type to maintain optimal dissipation rates throughout the liquid consumption period
Solution Approach 2:
The system changes the heating parameter (wattage) from a fixed constant value to a variable value that adapts based on operational duration and fragrance characteristics, ensuring consistent dissipation performance across different conditions
2Device complexity
If conventional wick-based vapor emanation systems use constant heating power, then the device structure is simple, but the fragrance levels become uncontrolled and non-uniform across different space sizes
Solution Approach 1:
The heating system implements dynamic power adjustment with multiple wattage levels that can be selected based on space size and desired fragrance intensity, transforming a static single-power system into an adaptive multi-power system
Solution Approach 2:
The system introduces variable heating power parameters that can be modified according to operational requirements, enabling controlled fragrance dispersion across different environmental conditions and space configurations
3Ease of operation
If conventional wick-based systems operate continuously at constant power, then the operation is simple, but olfactory fatigue causes non-uniform perceived smell over time
Solution Approach 1:
The heating device implements periodic variation in power output, cycling between different wattage levels to prevent continuous exposure at the same intensity, thereby counteracting olfactory fatigue and maintaining uniform fragrance perception over time
Solution Approach 2:
The system transitions from static continuous heating to dynamic intermittent heating with varying power levels, creating a time-varying heating pattern that maintains fragrance effectiveness throughout the operational period
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 system maintains consistent and noticeable fragrance levels over time, avoiding anosmia and providing customizable scent profiles for various spaces, reducing waste and enhancing user experience.
Implementation Method 1
The partially submerged portion of the wick absorbs the liquid, some of which diffuses by capillary or wicking action into the exposed, unsubmerged portion of the wick
Implementation Method 2
The exposed portion of the wick is locally heated, often by means of a heating device that fits over the wick. This causes the liquid which has diffused into the exposed portion of the wick to evaporate into the surrounding air
Implementation Method 3
The controller can be configured to deliver pulse-width-modulated electrical voltage to the heater
Data Source
AI summary
A fragrance dispenser can comprise a housing having a socket portion and defining a receptacle configured to receive a bottle having a fragrance-producing liquid therein and a wick extending therefrom. A heater can be disposed proximate to the receptacle so that, when the bottle is received within the receptacle, the heater is disposed proximate to the wick. A controller can be configured to deliver electrical voltage (e.g., pulse-width-modulated voltage) to the heater. A user input device can be in communication with the controller. The controller receives an input from the user input device that is indicative of a selected heat profile of a plurality of heat profiles, and the controller controls the power output of the heater in accordance with the selected heat profile.