Power Extractor Circuit for Solar Impedance Matching
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Solution Overview
Problem
Existing solar cell systems face inefficiencies in converting solar energy into electrical energy due to diurnal variance in solar intensity, voltage mismatch between solar cells and loads, and power loss during voltage regulation, leading to reduced energy transfer and stability issues.
Innovation Solution
A power extractor system with impedance matching capabilities, utilizing power transfer circuitry and analysis circuitry to detect power and voltage changes, adjusting the duty cycle of switching circuitry to maximize power transfer between a power source and a load, achieving universal impedance matching and minimizing power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If solar cells are directly connected to electrical loads, then the system is simple, but voltage mismatch causes power loss and reduced energy transfer efficiency
Solution Approach 1:
A power extractor circuit is introduced as an intermediary device between the solar cell array and the electrical load. This circuit includes switching elements, energy storage components (inductors and capacitors), and control circuitry that actively manages power transfer. The power extractor matches the voltage and current characteristics between the solar cells and load, maximizing power transfer efficiency while preventing the harmful effects of direct connection mismatch.
2Power
If solar cell output is increased to meet load requirements, then power availability improves, but voltage regulation becomes unstable due to diurnal variance in solar intensity
Solution Approach 1:
The power extractor incorporates feedback control circuitry that continuously monitors the output voltage and current from the solar cells, as well as the load requirements. Based on this feedback, the control circuit dynamically adjusts the duty cycle of the switching elements and modifies the impedance of the energy storage components to maintain stable voltage regulation despite variations in solar intensity throughout the day.
Solution Approach 2:
The power extractor uses dynamic switching of energy storage elements and adjustable impedance components that can change their characteristics in real-time. The switching circuitry alternates between different configurations, and the energy storage components dynamically charge and discharge to compensate for fluctuations in solar output, maintaining stable power delivery to the load.
3Productivity
If voltage regulation is implemented to match solar cell output with load requirements, then energy transfer efficiency improves, but power loss increases during regulation
Solution Approach 1:
The power extractor changes the operating parameters of the solar cell array by using switching circuitry to alter the effective voltage and current extraction points on the solar cell I-V curve. By dynamically adjusting the duty cycle and switching frequency, the system operates the solar cells at their maximum power point under varying conditions, maximizing energy transfer efficiency while minimizing regulation losses through optimal parameter selection.
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 system enhances energy transfer efficiency by closely approaching maximum power extraction, reducing power loss and improving stability across varying solar conditions, enabling more effective use of solar energy.
Implementation Method 1
a first winding (L1) coupled to the power source, a second winding (L2) coupled to the load, a third winding (L3) coupled in series with the first winding (L1), and a fourth winding (L4) coupled in series with the second winding (L2)
Data Source
AI summary
In some embodiments, a power extractor utilizes power transfer circuitry with analysis circuitry to detect a power slope and to control the magnitude of the current in response to the detected power slope. The power analysis circuitry may increase the current as long as the power slope shows an increase in power and may decrease the current as long as the power slope shows a decrease in power. The magnitude of the current is responsive to the duty cycle of the switching circuitry and to the detected power slope. Other embodiments are described and claimed.