MEMS Reflectors for Solar Array Light Concentration
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Solution Overview
Problem
Current solar power generators using flat-plate technologies have low solar-to-power conversion efficiencies, are cumbersome, and require frequent adjustments to track the sun, leading to long charge times and inefficient energy conversion.
Innovation Solution
A micro-concentrator solar array system utilizing micro-electromechanical systems (MEMS) based reflectors that adjust to focus light onto solar cells, enhancing energy concentration and reducing the need for manual positioning by using a control module to reposition reflectors based on electrical output thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If flat-plate solar cell technologies are used, then the device structure is simple, but the solar-to-power conversion efficiency is low
Solution Approach 1:
The solar collection system is segmented into multiple independent micro-concentrator units, each with its own solar cell and reflector array. This segmentation allows each unit to independently optimize light concentration while maintaining overall system simplicity and ease of manufacture.
Solution Approach 2:
Reflector arrays are introduced as intermediary components between the light source and solar cells. These reflectors concentrate incident light onto the solar cells, enabling higher conversion efficiency without complicating the fundamental flat-plate structure.
2Volume of moving object
If flat-plate solar power generators are used, then the device is compact, but the charge time is long
Solution Approach 1:
The reflector arrays are made dynamically adjustable rather than fixed, allowing them to track and follow the sun's movement throughout the day. This dynamic adjustment maintains optimal light concentration on the solar cells, significantly reducing charge time while preserving the compact form factor.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor light intensity and reflector positioning, automatically adjusting the reflector angles to maintain optimal concentration ratios. This feedback control ensures maximum energy harvesting efficiency throughout the day, reducing overall charging duration.
3Loss of energy
If manual positioning of solar power generators is required, then the conversion efficiency may be adequate, but the operation complexity increases
Solution Approach 1:
The micro-concentrator units are designed to automatically track and position themselves relative to the sun using integrated sensors and actuators. This self-service capability eliminates the need for manual positioning operations while maintaining high conversion efficiency through continuous optimal alignment.
Solution Approach 2:
Manual mechanical positioning is replaced with automated electro-mechanical or electro-optical tracking systems. These systems use sensors to detect sun position and automatically adjust reflector angles, substituting complex manual operations with simpler automated control mechanisms.
4Loss of energy
If a plurality of groups of reflectors is added to concentrate light, then the solar-to-power conversion efficiency increases, but the device complexity increases
Solution Approach 1:
The complex reflector system is divided into multiple independent groups, each associated with a specific solar cell or small array. This segmentation allows each reflector group to be optimized independently and simplifies the control architecture, making the overall complex system more manageable and manufacturable.
Solution Approach 2:
The reflector groups are designed with universal mounting interfaces and control mechanisms that can be applied across all micro-concentrator units. This universality reduces the overall system complexity by using standardized components rather than custom-designed elements for each unit.
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 achieves higher solar-to-power conversion efficiencies, reduces energy loss to heat, and eliminates the need for frequent manual adjustments, enabling more compact and efficient solar energy harvesting.
Implementation Method 1
micro-electromechanical systems (MEMS) based reflectors that adjust to focus light onto solar cells
Implementation Method 2
Solar cells convert light energy, typically from the sun, into electrical energy
Data Source
AI summary
A method and apparatus for focusing light onto a plurality of solar cells. The apparatus comprises a plurality of solar cells, a plurality of groups of reflectors corresponding to the plurality of solar cells, and a control module in communication with the plurality of solar cells and the plurality of groups of reflectors. The control module includes control logic for monitoring an electrical output from the plurality of solar cells and repositioning the plurality of groups of reflectors when the electrical output is below a selected threshold.