Space Solar Cell String Protection With Replaceable Diode Layout
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Solution Overview
Problem
Current space solar cell designs face challenges in reliability and maintainability due to the complex integration of string protection diodes, which leads to increased manufacturing costs and limited redundancy, making repairs and replacements economically and practically difficult, especially under high radiation and temperature conditions in space applications.
Innovation Solution
The arrangement of space solar cells in a strand with integrated strand protection diodes on the front, connected via a metal strip and separate cover glass, allows for reduced wiring effort and easier replacement of individual DIEs, enhancing reliability and reducing manufacturing costs through improved thermal management and redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If string protection diodes are integrated on the back of the panel via flexible cables, then reliability is improved through redundancy, but device complexity and wiring effort increase significantly
Solution Approach 1:
The patent combines multiple string protection diodes onto a single DIE (integrated circuit), reducing the number of separate components from multiple discrete diodes to one integrated unit. This merging approach maintains the redundancy function while significantly simplifying the wiring architecture on the back of the panel.
Solution Approach 2:
The integrated DIE serves multiple functions simultaneously: it provides string protection diode functionality for multiple strings, acts as a centralized connection point for flexible cables, and consolidates wiring infrastructure. This multi-functionality reduces overall system complexity while maintaining reliability through redundancy.
2Ease of repair
If individual space solar cells and bypass diodes are separately replaceable, then ease of repair is improved, but manufacturing complexity and cost increase
Solution Approach 1:
Multiple string protection diodes are merged onto a single DIE, creating a modular replacement unit. This allows the entire protection diode assembly for multiple strings to be replaced as one unit, simplifying repair procedures while reducing manufacturing complexity compared to handling multiple separate diodes.
Solution Approach 2:
The patent segments the string protection function into replaceable DIE modules that can be independently exchanged. Each DIE serves as a discrete, replaceable unit that maintains system functionality, enabling easy repair without affecting other parts of the solar panel system.
3Ease of manufacture
If cover glass protects both space solar cells and bypass diodes, then manufacturing steps are reduced, but repairability worsens as individual components cannot be replaced
Solution Approach 1:
The patent creates a segmented protection strategy where the cover glass protects the solar cells while the integrated DIE modules provide protected replacement units for the protection diodes. This segmentation allows the cover glass to remain in place during repairs, maintaining manufacturing simplicity while enabling component replacement through modular DIE units.
Solution Approach 2:
The integrated DIE acts as an intermediary between the covered solar cell array and the flexible cable connections on the back of the panel. This intermediary structure allows protection diodes to be replaced without removing or damaging the cover glass, maintaining both manufacturing simplicity and repairability.
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 configuration significantly reduces the complexity of wiring on the back of the panel, enables easier replacement of individual string protection diodes, and enhances reliability by providing effective thermal management and high redundancy, thus improving the overall performance and maintainability of space solar cell arrays.
Implementation Method 1
The space solar cells immediately adjacent along the X-direction are electrically interconnected in series by means of one or more metallic connectors
Implementation Method 2
the front sides of each space solar cell and the bypass diode located in the corner are protected from short-wave UV light by means of a separate, very thin cover glass
Implementation Method 3
The ultrathin cover glasses are each less than 0.2 mm thick and are bonded to the front of the space solar cell using an adhesive
Implementation Method 4
For reliability, the connectors are always welded
Data Source
Figure 1a
Figure 2a~2e
Figure 3a~3e
AI summary
Protection of space solar cells in an arrangement in the form of a string extending in an X-direction, in which two space solar cells immediately adjacent in the X-direction are electrically connected in series by means of a metallic connector of a first type, and the string has a first end and a second end opposite the first end, and a protective arrangement extending along a y-direction is formed immediately at one of the two ends, wherein the protective arrangement comprises a first string protection diode arrangement extending in the Y-direction and a metal strip and a second string protection diode arrangement, and the protective arrangement is electrically connected to one of the two ends of the string by means of two spaced-apart metal strips, and each string protection diode arrangement comprises several unpackaged string protection diodes.