Plug-In Bypass Diode Assembly for Serviceable Photovoltaic Modules
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Solution Overview
Problem
Existing photovoltaic module connection assemblies do not allow for simple and accessible replacement of faulty bypass diodes, which can lead to reduced efficiency due to shadowing or faults, and require specialized knowledge for maintenance.
Innovation Solution
A connection assembly with plug receptacles for bypass diodes that can be easily exchanged, allowing non-specialist personnel to replace them, and featuring a connection box with isolating contacts and a housing for heat management and polarity assurance, along with an optional light-emitting diode for fault indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bypass diodes are integrated into the connection box, then the module structure is compact and protected, but the bypass diodes cannot be easily replaced when faulty
Solution Approach 1:
The connection assembly is divided into separate functional components: the connection box housing and the bypass diode module. The bypass diode is mounted on a separate printed circuit board that can be independently accessed and replaced, while the connection box maintains its protective enclosure. This segmentation allows the bypass diode to be replaced without dismantling the entire connection box structure.
Solution Approach 2:
A printed circuit board serves as an intermediary component between the bypass diode and the connection box terminals. The bypass diode is mounted on this board, which provides both electrical connection and mechanical mounting. This intermediary structure enables the bypass diode to be accessed and replaced through a dedicated access opening in the connection box without compromising the overall structural integrity or requiring complete disassembly.
2Ease of operation
If bypass diodes are placed outside the layer stack, then they are accessible for replacement, but they are exposed to high currents and high temperatures leading to thermal overload
Solution Approach 1:
The bypass diode module is nested within the connection box structure. The printed circuit board with the mounted bypass diode is positioned inside the connection box housing, which provides thermal management and physical protection. This nested arrangement allows the bypass diode to be accessible for replacement through a dedicated opening while simultaneously being protected from excessive thermal exposure by the housing structure.
Solution Approach 2:
The printed circuit board acts as an intermediary that manages the thermal and electrical interface between the bypass diode and the connection box environment. The board provides structured mounting that controls thermal exposure while maintaining electrical connectivity, allowing the bypass diode to operate in a thermally managed environment that is still accessible for maintenance.
3Reliability
If bypass diodes are soldered directly to contact strips, then the connection is robust, but replacement requires specialized knowledge and tools
Solution Approach 1:
The electrical connection system is segmented into modular components: the connection box housing, the printed circuit board, and the bypass diode. The bypass diode is mounted on the printed circuit board using standard through-hole or surface-mount techniques that create reliable solder joints, while the board itself connects to the connection box terminals. This segmentation allows the bypass diode to be replaced by simply detaching and reattaching the board module, eliminating the need for specialized soldering tools or expertise.
Solution Approach 2:
The connection system transitions from a static, permanently soldered configuration to a dynamic, replaceable module. The printed circuit board is designed to be detachably connected to the connection box terminals, allowing the bypass diode assembly to be dynamically removed and replaced. This dynamic connection maintains electrical reliability through secure mechanical and electrical interfaces while enabling easy replacement by untrained personnel.
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
Enables straightforward replacement and maintenance of bypass diodes by untrained personnel, reduces thermal impact, and allows for flexible upgrading of diode quality, improving module efficiency and reliability.
Implementation Method 1
The bypass diodes conduct current past shadowed or faulty cell assemblies
Implementation Method 2
an optional light-emitting diode for fault indication
Data Source
AI summary
A connection assembly for a photovoltaic module includes at least one cell assembly which is externally contactable to at least two contacts. The connection assembly includes at least one bypass diode, which is arranged externally of the at least one cell assembly and connected in parallel to the at least one cell assembly. The connection assembly is characterized in that the connection assembly has at least one plug receptacle into which the bypass diode can be plugged in with plug contacts. A photovoltaic module with such a connection assembly is also provided.