Thermoelectric Surface Lighting Device for Continuous Illumination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Retroreflective markers are impaired by environmental conditions such as rain, snow, and ultraviolet degradation, while solar-powered markers face challenges with power generation due to cloudy days and damage, and thermoelectric cells are affected by low traffic and mechanical damage.
Innovation Solution
Surface lighting devices incorporating a thermoelectric power generation unit, energy storage device, and light source, which utilize a thermal gradient to generate electricity and power the light source continuously, regardless of environmental conditions, with voltage step-up circuits to enhance voltage for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If retroreflective markers are used to demarcate boundaries, then visibility is provided through light reflection, but environmental conditions such as rain, snow, and ultraviolet degradation impair reflection and reduce observable reflectivity
Solution Approach 1:
The patent replaces the passive optical reflection system with an active thermoelectric power generation system. Instead of relying on incident light reflection which degrades under environmental conditions, the marker uses thermoelectric cells to convert thermal gradients into electrical energy, powering an internal light source that actively illuminates the marker regardless of ambient light or weather conditions.
Solution Approach 2:
The thermoelectric power generation system is self-powered by utilizing the natural thermal gradient between the pavement surface and the earth below. The system generates its own electricity from the temperature difference without requiring external power sources, making it autonomous and reliable under varying environmental conditions.
2Use of energy by moving object
If solar powered markers with photovoltaic cells are used to generate electricity internally, then continuous power supply is achieved, but photovoltaic cells are easily damaged and power generation is heavily impacted by environmental conditions such as cloudy days and dirt accumulation
Solution Approach 1:
The patent changes the operating parameter from photovoltaic (light-based) energy conversion to thermoelectric (heat-based) energy conversion. This parameter change allows the system to operate independently of sunlight availability and intensity, utilizing instead the consistent thermal gradient between the pavement surface and subsurface earth, which remains relatively stable regardless of weather conditions.
Solution Approach 2:
The patent substitutes the photovoltaic cell system with a thermoelectric cell system. This replacement eliminates the fragility and environmental sensitivity of photovoltaic cells while maintaining the capability for internal power generation. The thermoelectric system is more durable and less susceptible to damage from environmental factors.
3Adaptability or versatility
If thermoelectric cells are used to generate electricity from thermal gradient, then operation under various environmental conditions is achieved, but power generation is affected by low traffic and mechanical damage risks
Solution Approach 1:
The patent embeds the thermoelectric power generation unit and light source within a protective housing that integrates with the pavement marker structure. The housing protects the sensitive electronic components from mechanical damage while allowing thermal conduction for power generation. This nested configuration ensures both protection and functional operation.
Solution Approach 2:
The patent employs a protective housing or enclosure that shields the thermoelectric cells and electronic components from mechanical damage. This protective shell allows the system to withstand environmental stresses and potential impacts while maintaining the thermal gradient necessary for power generation.
4Power
If voltage step-up circuits are incorporated to enhance voltage for efficient operation, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The patent employs a voltage step-up circuit that uses electromagnetic induction principles to transform the low voltage output of the thermoelectric cells into higher voltage suitable for powering the LED light source. This electrical transformation approach is more efficient than mechanical voltage multiplication methods.
Solution Approach 2:
The voltage step-up circuit changes the electrical parameter (voltage level) to optimize power delivery to the light source. By transforming the voltage parameter, the system achieves efficient operation of the LED while managing the inherent limitations of the thermoelectric power generation.
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 solution provides continuous illumination under various environmental conditions, with durable thermoelectric elements and efficient power generation, ensuring long-lasting and reliable surface lighting for markers and pathways.
Implementation Method 1
thermoelectric cells generate electricity based on a thermal gradient existing about the thermoelectric cells
Data Source
AI summary
Surface lighting devices including at least one light source, at least one energy storage device, and a thermoelectric power generation unit electrically coupled to the at least one energy storage device are disclosed herein. The at least one energy storage device is charged by the thermoelectric power generation unit, and the stored energy is used to illuminate the at least one light source. The surface lighting devices include a voltage step-up circuit that converts a DC voltage produced by the thermoelectric power generation unit into a higher-level DC voltage. Methods for illuminating a surface utilizing the surface lighting devices are also disclosed.