Multiphase Solar DC-DC Converter Combining for Low Ripple Output
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Solution Overview
Problem
Existing solar power systems face challenges in efficiently harnessing energy across the entire power spectrum due to variations in solar energy influx and photovoltaic effects, leading to inefficiencies and regulatory limitations, particularly in large-scale power generation.
Innovation Solution
The system employs synchronized DC-DC converters with combiner circuitry to combine power deliveries, utilizing low inductance and capacitance, and switches controlled by a common duty cycle to achieve high efficiency and stable output voltage, reducing energy storage and ripple.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If larger strings of panels are used to generate more power, then power generation capacity increases, but regulatory limits and system complexity increase
Solution Approach 1:
The system segments the power generation into multiple independent phases (first phase, second phase, third phase, fourth phase) with separate DC-DC converters. Each phase operates independently to process power from different panel strings, allowing the system to handle larger total power capacity while maintaining manageable complexity through modular architecture. The combiner circuitry then integrates these segmented phases into a unified output.
2Loss of energy
If conventional DC-DC converters are used, then power conversion is achieved, but efficiency drops and energy storage requirements increase
Solution Approach 1:
The system employs phased periodic operation where converters operate in alternating phases (first and second phase converters operate in one half-cycle, third and fourth phase converters operate in the other half-cycle). This periodic action allows for optimized switching patterns that reduce energy losses during conversion while maintaining continuous power delivery capability through the combiner circuitry.
Solution Approach 2:
The combiner circuitry merges the outputs of multiple DC-DC converters into a single unified output. This combining approach allows the system to achieve high efficiency from individual converter stages while delivering substantial total power capacity, resolving the contradiction between efficiency and productivity by aggregating multiple efficient small-scale conversions into a high-capacity system.
3Loss of energy
If high voltage operation is used to improve efficiency, then power delivery efficiency increases, but regulatory limits are exceeded
Solution Approach 1:
The system segments the voltage transformation across multiple converter stages rather than using a single high-voltage conversion stage. Each DC-DC converter operates at optimized voltage levels for its specific function, avoiding the need for any single component to handle excessive voltage that would violate regulatory limits, while the cumulative effect achieves high overall power delivery efficiency.
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 approach enhances power generation efficiency, maintains stable output voltage, and reduces energy storage requirements, achieving efficiencies up to 99.5% while adhering to regulatory limits.
Implementation Method 1
Because the influx of solar energy can vary and because the photovoltaic effect itself can vary
Data Source
AI summary
A high efficiency solar power system combining photovoltaic sources of power (1) can be converted by a base phase DC-DC photovoltaic converter (6) and an altered phase DC-DC photovoltaic converter (8) that have outputs combined through low energy storage combiner circuitry (9). The converters can be synchronously controlled through a synchronous phase control (11) that synchronously operates switches to provide a conversion combined photovoltaic DC output (10). Converters can be provided for individual source conversion or phased operational modes, the latter presenting a combined low photovoltaic energy storage DC-DC photovoltaic converter (15) at string or individual panel levels.