Photovoltaic Module Junction Box Power Management
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Solution Overview
Problem
Existing photovoltaic modules face challenges in efficiently managing and converting DC power from solar cells, particularly in preventing power loss due to reverse voltage and hot spots, and in easily integrating power supply and storage capabilities.
Innovation Solution
Incorporating a junction box with a capacitor unit for power storage, a DC/DC converter unit for power level adjustment, and an inverter unit for AC power conversion, along with bypass diodes to manage reverse voltage, and a heat releasing member to prevent efficiency reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a junction box with capacitor unit and DC/DC converter unit is added to store and convert DC power, then power supply capability and system capacity are enhanced, but device complexity increases
Solution Approach 1:
The patent combines the capacitor unit for power storage, DC/DC converter unit for power level adjustment, bypass diodes for reverse voltage protection, and inverter unit for AC conversion into a single integrated junction box assembly. This merging of multiple power management functions into one unified component resolves the contradiction by providing enhanced power supply capability while avoiding the complexity of separate distributed components.
2Reliability
If bypass diodes are added to bypass solar cells with reverse voltage, then power loss is minimized and reliability is improved, but device complexity increases
Solution Approach 1:
The bypass diodes are integrated within the junction box assembly rather than being separate external components. This merging approach provides reliable reverse voltage protection by enabling current to bypass malfunctioning solar cells while maintaining system integrity, without adding the complexity of external protection circuits.
3Adaptability or versatility
If an inverter unit is added to convert DC power to AC power, then adaptability and versatility are improved, but device complexity increases
Solution Approach 1:
The inverter unit is integrated into the junction box assembly, combining DC to AC power conversion capability with other power management functions. This merging provides enhanced adaptability and versatility by enabling the photovoltaic module to output both DC and AC power while avoiding the complexity of separate inverter equipment.
4Reliability
If a heat releasing member is added to prevent heat-related efficiency reduction, then reliability is improved, but device complexity increases
Solution Approach 1:
The heat releasing member is integrated into the junction box assembly, combining thermal management functionality with the electrical power management components. This merging provides reliable heat dissipation to prevent efficiency reduction while avoiding the complexity of separate thermal management systems.
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 minimizes power loss, facilitates easy installation, and enhances the capacity of photovoltaic systems by enabling efficient DC to AC power conversion and storage, while preventing damage from reverse voltage and heat-related efficiency issues.
Implementation Method 1
a solar cell module including a plurality of solar cells
Implementation Method 2
a capacitor unit attached to one face of the solar cell module and that stores DC power supplied from the solar cell module
Data Source
AI summary
A photovoltaic module includes: a solar cell module including a plurality of solar cells; and a junction box including a capacitor unit attached to one face of the solar cell module and that to stores DC power supplied from the solar cell module, and a dc/dc converter unit to convert the level of the stored DC power and output the same. Thus, power may be easily supplied through the junction box.