Photovoltaic Junction Box Thermal Management via PCB Heat Sink
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Solution Overview
Problem
Photovoltaic connection boxes face challenges in effectively dissipating heat generated by internal electrical and electronic components, which can lead to temperature rise issues and potential damage to both internal and external structures, necessitating improved thermal transfer properties to maintain compliance with industry standards.
Innovation Solution
A junction box design featuring a printed circuit board with integrated heat sink elements, a copper liner plate for enhanced thermal conduction, and a cover portion that allows for external heat dissipation, ensuring effective transfer of heat away from internal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat dissipation structures are added to the connection box, then thermal management is improved, but device complexity increases
Solution Approach 1:
The heat sink is integrated directly into the PCB assembly, merging the thermal management function with the existing circuit board structure. This eliminates the need for separate heat dissipation components while still providing effective thermal pathways from the diodes to the external environment through the PCB's copper traces and mounting holes.
Solution Approach 2:
The PCB serves multiple functions: it provides electrical connections, structural support, and thermal management. By incorporating heat dissipation pathways into the PCB design, the same component performs both circuitry and thermal regulation functions, reducing overall device complexity while improving temperature control.
2Temperature
If larger heat sink elements are used, then heat dissipation is improved, but volume of the connection box increases
Solution Approach 1:
Instead of increasing heat sink size in the traditional horizontal direction, the solution utilizes the vertical dimension by conducting heat through the PCB thickness to external heat dissipation surfaces. This allows effective thermal management without increasing the lateral footprint or overall volume of the connection box.
Solution Approach 2:
The heat dissipation capability is concentrated at specific locations where diodes generate heat, rather than requiring a large uniform heat sink throughout the entire connection box. The PCB's copper traces and mounting structures provide localized thermal pathways only where needed, optimizing heat dissipation while minimizing volume.
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 enhances current output capacity by efficiently managing heat dissipation, maintaining component safety and adhering to temperature standards, thereby improving the reliability and performance of photovoltaic systems.
Implementation Method 1
the heat sinks transfer heat to the liner plate, and the liner plate conducts heat to the cover portion for dissipation externally of the junction box
Implementation Method 2
Due to the photovoltaic effect, the energy of photons is converted into electrical power within a PV cell when the PV cell is irradiated by a light source such as sunlight
Data Source
AI summary
A photovoltaic connection system for maximum current output and heat dissipation properties. The connection system includes a connection box with improved heat transfer capability to permit higher current output capacity. Diodes are surface-mounted on a printed circuit board inside of the connection box. An optional metal plate may be mounted inside the cover plate of the connection box as a heat sink for dissipating heat from the diodes. The metal in the plate has good thermal transfer characteristics, e.g., copper or aluminum.