Dynamic Impedance Matching Power Extractor for Solar Arrays
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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, requiring voltage and current matching that results in significant power loss, especially when solar cell arrays are connected directly to batteries.
Innovation Solution
A power extractor system that dynamically adjusts its input impedance to match the impedance of the power source, allowing for maximum power transfer between the source and load, utilizing detection circuitry to continuously monitor and adjust the duty cycle of switching circuitry to achieve impedance matching and maximize power extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If solar cell arrays are connected directly to batteries, then the system structure is simple, but significant power loss occurs due to voltage and current mismatch
Solution Approach 1:
A power extractor circuit is introduced as an intermediary device between the solar cell array and the battery. This circuit includes switching elements, inductors, and capacitors that enable efficient power transfer by matching the impedance between the solar array and battery, thereby reducing power loss while maintaining reasonable system complexity.
Solution Approach 2:
The power extractor dynamically changes electrical parameters (voltage, current, impedance) through controlled switching of electronic components. By adjusting the duty cycle of switching elements and utilizing energy storage components, the circuit adapts its input and output characteristics to match the varying impedance of the solar array and battery, maximizing power transfer efficiency.
2Loss of energy
If voltage and current matching is implemented to reduce power loss, then power transfer efficiency improves, but device complexity increases
Solution Approach 1:
The power extractor employs dynamic switching of electronic components to adapt to varying impedance conditions. The switching elements change their state periodically, allowing the circuit to transform its electrical characteristics dynamically. This enables the system to maintain optimal power transfer efficiency across different operating conditions without requiring overly complex control mechanisms.
3Productivity
If maximum power point tracking is used to optimize power extraction, then energy conversion efficiency improves, but control complexity increases
Solution Approach 1:
The power extractor incorporates feedback mechanisms that monitor the electrical characteristics of the solar array and adjust the switching duty cycle accordingly. By continuously sensing the operating point and modifying the control parameters, the system tracks the maximum power point automatically, optimizing energy conversion efficiency while using relatively simple control logic.
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 significantly reduces power loss by ensuring optimal impedance matching, allowing solar cell systems to extract and convert solar energy more efficiently, even under varying sunlight conditions, thereby improving energy transfer efficiency.
Implementation Method 1
the power extractor is to be operated such that an input impedance of the power extractor is dynamically changed in response to the detected power changes to approach matching a first impedance outside the power extractor including an impedance of a power source
Data Source
AI summary
In some embodiments, a power extractor may operate such that the source impedance and the load impedance may have various values. The power extractor dynamically matches the impedance of the source and the load for the maximum transfer of power. The power extractor includes detection circuitry to continuously detect power changes, and is operated such that impedances of the power extractor between the source and load are dynamically changed in response to the detected power changes. The power extractor may then match an impedance of a power source to the impedance of a load. Other embodiments are described and claimed.