Power Conditioning Circuit for Non-Linear Generators
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Solution Overview
Problem
Renewable energy sources like solar photovoltaic panels and wind generators have non-linear power output characteristics, making it challenging to maximize power delivery due to varying voltage and current, which requires sophisticated and costly electronics for precision measurement.
Innovation Solution
A power conditioning circuit that uses a boost circuit and synchronous rectifier controlled by a duty cycle controller to optimize voltage and current, maximizing power delivery into a DC bus with constant voltage, eliminating the need for precise current measurement and reducing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If precision measurement of current and voltage is used to maximize power output, then power optimization is achieved, but device complexity and cost increase
Solution Approach 1:
The patent extracts only the essential measurement requirement - monitoring battery current through a simple sense resistor - while eliminating the need for complex voltage and current measurements. This selective extraction of the minimum necessary measurement achieves power optimization without requiring sophisticated electronics.
Solution Approach 2:
The patent replaces expensive precision measurement electronics with inexpensive components, specifically using a simple sense resistor and basic microcontroller ADC to measure battery current. This substitution achieves the same functional goal with much lower cost and complexity.
2Measurement precision
If sophisticated electronics are used for precision measurement, then measurement accuracy is improved, but cost increases
Solution Approach 1:
The patent substitutes expensive precision measurement electronics with inexpensive components, specifically using a simple sense resistor and basic microcontroller ADC to measure battery current. This substitution achieves the same functional goal with much lower cost and complexity.
Solution Approach 2:
The system uses the microcontroller's built-in ADC and existing sense resistor infrastructure to perform measurements, eliminating the need for separate expensive measurement devices. The microcontroller serves multiple functions including measurement, processing, and control.
3Productivity
If maximum power point tracking is implemented for non-linear generators, then power delivery is maximized, but system complexity increases
Solution Approach 1:
The patent extracts only the essential control variable - battery current - from the complex power optimization problem. By focusing solely on maximizing battery current rather than implementing full maximum power point tracking with multiple measurements and calculations, the system achieves power optimization with minimal complexity.
Solution Approach 2:
The patent changes the control parameter from complex multi-variable power optimization to simple single-variable battery current maximization. This parameter transformation simplifies the control system while maintaining effective power delivery optimization for non-linear generators.
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 solution effectively maximizes power delivery by simplifying the system, reducing costs, and increasing reliability and durability, while maintaining optimal power output under varying conditions without requiring expensive computational circuitry or precise sensing equipment.
Implementation Method 1
A boost circuit and synchronous rectifier having a variable duty cycle are controlled by a duty cycle controller to step up the voltage from the renewable source to the constant voltage of the DC bus
Implementation Method 2
In one embodiment, an isolation transformer serves to isolate the renewable power source from the DC bus
Data Source
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AI summary
A circuit receives variable voltage and current from a renewable power source and optimally loads the source to maximize power delivered into a DC bus having constant voltage. A boost circuit and synchronous rectifier having a controlled duty cycle step up the voltage from the renewable source. A feedback control circuit senses delivered current and optimizes the duty cycle to maximize this current, and therefore maximize delivered power. Precision measurement of delivered current is not necessary, greatly reducing complexity and expense. The power source can be isolated from the DC bus, and an arc fault sensor can determine the presence of an electrical arc and shut down the power conditioner to prevent damage due to arcing or fire.