Photovoltaic Junction Box Guide Channels and Spring Tension Connectors
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Solution Overview
Problem
Current electrical junction boxes for photovoltaic systems are complex, laborious to install, and lack durability and reliable electrical connections, making them unsuitable for efficient and dependable operation in photovoltaic systems.
Innovation Solution
A junction box design featuring a housing with guide channels for conductive foil strips, low insertion connectors, and a heat sink with fins for heat dissipation, along with a cover that creates spring tension to secure connections, ensuring reliable physical and electrical connections and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current junction box designs are used, then electrical connections can be established, but the construction becomes complex and installation becomes laborious
Solution Approach 1:
The junction box is divided into a base and a removable cover as separate components. The base contains all electrical components (buss bars, connectors, diodes) while the cover provides protection and engagement features. This segmentation simplifies installation and maintenance while maintaining reliable electrical connections.
Solution Approach 2:
Low insertion connectors serve as intermediary components between the foil strips from solar panels and the buss bars. These connectors simplify the connection process by providing a standardized interface that ensures reliable electrical connection without complex assembly procedures.
2Ease of manufacture
If current junction box designs are used, then electrical connections are established, but durability is low and connections are unreliable
Solution Approach 1:
The cover incorporates bosses that apply dynamic spring tension to the low insertion connectors when the cover is engaged. This spring tension maintains consistent contact pressure on the foil strips, ensuring reliable electrical connections that can withstand environmental conditions while remaining easy to install and remove.
Solution Approach 2:
The engagement of the cover changes the mechanical state of the connectors by applying spring tension. This parameter change (from relaxed to tensioned state) ensures reliable electrical contact without requiring complex assembly procedures, making installation easy while maintaining connection reliability.
3Ease of operation
If a simple junction box design is used, then installation is easier, but reliable electrical connections cannot be maintained
Solution Approach 1:
The low insertion connectors are pre-configured in the base with appropriate tensioning mechanisms. When the cover is engaged, the connectors are automatically tensioned to the correct level, ensuring reliable electrical connections without requiring the installer to perform complex adjustment procedures. This preliminary configuration maintains simplicity while ensuring connection reliability.
4Reliability
If current junction box designs are used, then basic electrical connections are made, but they cannot withstand environmental conditions
Solution Approach 1:
The base and cover are merged into a single protective housing structure that encloses and protects all electrical components. This unified housing design provides environmental protection (against moisture, dust, and physical damage) while maintaining a relatively simple overall structure that does not significantly increase installation complexity.
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 simplifies installation, enhances reliability, and maintains durable connections, effectively addressing the shortcomings of existing junction boxes by providing a robust and efficient electrical connection system capable of withstanding environmental conditions.
Implementation Method 1
The junction box further includes a heat sink having a plurality of fins that protrude outwardly from the housing. Accordingly, heat is dissipated external of the housing.
Data Source
AI summary
A junction box for a photovoltaic system includes a housing having a base and a cover removably attached thereto, and a plurality of guide channels extending from an exterior surface of the housing to an interior portion thereof. The guide channels are sized and shaped to receive a plurality of conductive foil strips from a solar panel array. When the strips are fed into the guide channels, they are guided to and properly positioned within corresponding receptacles. Each receptacle is sized and shaped to receive a buss bar, and each strip is connected to a corresponding buss bar by a low insertion connector. When the cover is fully engaged with the base, bosses extending from the cover press against the connectors, creating a spring tension and pinch and retain the associated strip. As a result, a reliable physical and electrical connection between the strips and the buss bars is achieved. A heat sink having a plurality of fins protrude outwardly from the housing to dissipate heat externally.