Solar Charge Controller With Inductive Balancing for Uneven Substrings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing solar charge controllers struggle to efficiently balance power output from solar substrings experiencing uneven illumination, leading to reduced total power output due to current throughput limitations of the least-illuminated substring.
Innovation Solution
The system employs a multi-winding transformer and power level pairs with switches and capacitors to balance voltages and store energy, allowing for a common voltage to be maintained across each power level, thereby boosting the total voltage output and isolating it from current limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If solar substrings are connected in series to increase voltage output, then voltage output is improved, but current throughput is limited by the least-illuminated substring
Solution Approach 1:
The system segments the solar substring array into multiple parallel strings, each with its own independent power conversion channel. This allows each string to operate independently at its own current level determined by illumination conditions, while voltages are synchronized through the transformer. The segmentation eliminates the series connection current bottleneck by providing multiple parallel current paths.
Solution Approach 2:
A transformer serves as an intermediary device between the parallel solar substrate strings and the load. The transformer couples the strings together magnetically to establish a common voltage reference while allowing independent current operation. This intermediary enables voltage synchronization without forcing current equality among strings.
2Productivity
If bypass diodes are used to route current around lower-output substrings, then current flow is improved, but system complexity increases
Solution Approach 1:
The power conversion circuitry performs multiple functions: it regulates voltage, manages current distribution, and enables parallel string operation. This multi-functional approach replaces the simple bypass diode function with a more capable system that handles both voltage and current management, eliminating the need for separate bypass components.
Solution Approach 2:
The controller monitors voltage and current from each solar substrate string and uses feedback to regulate the power conversion circuitry. This feedback mechanism dynamically adjusts operation to maintain optimal current flow through each string based on real-time conditions, replacing static bypass diode operation with dynamic control.
3Power
If solar substrings of different chemistries are used to optimize performance, then power output is improved, but voltage matching becomes difficult
Solution Approach 1:
The power conversion circuitry dynamically adjusts operating parameters for each solar substrate string based on its specific chemistry and illumination conditions. The controller continuously monitors and regulates voltage and current for each string, allowing flexible adaptation to different substrate types (silicon, perovskite, etc.) without requiring fixed voltage matching.
Solution Approach 2:
The system changes operating parameters (voltage, current, power conversion ratios) for each solar substrate string according to its specific characteristics. Different substrate chemistries can operate at different voltage levels, and the power conversion circuitry transforms these to a common output voltage, enabling parameter flexibility rather than fixed matching.
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 solution effectively balances mismatched output currents from solar substrings of different chemistries and configurations, enhancing total output power and enabling greater power delivery to a load under varying illumination conditions.
Implementation Method 1
a transformer configured to couple the power level pairs together to balance the voltages across the power level pairs, store energy output by the solar substrings, and transform the stored energy into current output from the last power level to a load
Data Source
AI summary
A system for balancing voltages in solar substrings in a first solar panel includes an inductive balancer circuit. The inductive balancer circuit includes a first power level pair and a second power level pair each coupled to the solar substring, and including: a pair of switches arranged in series; a pair of capacitors arranged in series and connected in parallel to the first pair of switches; and an inductor arranged between the first pair of switches and the first pair of capacitors. The system further includes a controller coupled to the inductive balancer circuit and configured to: oscillate states of the pair of switches at a duty cycle; balance voltages across the first power level pair and the second power level pair; and generate a total voltage output that is a multiple of a nominal operating voltage of a most-illuminated solar substring.