Wide Dynamic Range Charger Module for Photovoltaic Power Transfer
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Solution Overview
Problem
Electronic devices face inefficiencies and potential damage due to mismatches between the variable output characteristics of power sources, such as photovoltaic cells, and the fixed input characteristics of loads, leading to power dissipation and adverse effects.
Innovation Solution
A wide dynamic range charger module that selects and configures power converters based on the output characteristics of the power source, using low-range and high-range power converters to match the operating regime and maximize power transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single power converter is used to handle all power levels, then device complexity is reduced, but power transfer efficiency deteriorates due to mismatch between fixed converter characteristics and variable power source output
Solution Approach 1:
The charger is divided into multiple power converter circuits, each optimized for a specific operating regime (low-range, mid-range, high-range). Each converter handles a specific segment of the power spectrum, ensuring optimal efficiency within its designated range while avoiding the energy losses that would occur with a single general-purpose converter.
Solution Approach 2:
The charger dynamically switches between different power converter circuits based on the real-time output characteristics of the power source. The controller continuously monitors voltage and current levels and activates the appropriate converter circuit, making the system adaptable to varying illumination conditions and power source characteristics.
2Adaptability or versatility
If power converter characteristics are fixed, then device complexity is reduced, but adaptability to varying power source characteristics deteriorates
Solution Approach 1:
The charger employs multiple power converter circuits with different fixed characteristics, each optimized for specific operating conditions. The controller dynamically selects and activates the appropriate converter circuit based on real-time monitoring of power source voltage and current levels, enabling the system to adapt to varying illumination conditions without requiring each individual converter to be dynamically adjustable.
Solution Approach 2:
Different power converter circuits are designed with different electrical parameters (inductance, capacitance, switching frequencies) to match specific operating regimes. By changing which converter circuit is active based on power source characteristics, the system effectively changes its parameters to match the current operating conditions, optimizing power transfer efficiency across a wide range of scenarios.
3Object-affected harmful factors
If power source output is not matched to load input characteristics, then device complexity is reduced, but harmful effects increase due to power dissipation and potential damage
Solution Approach 1:
The charger segments the power conversion function into multiple specialized circuits, each designed to handle specific power levels and characteristics. This segmentation ensures that the power source output is always matched to an appropriate converter circuit, preventing power dissipation and potential damage that would occur with a mismatched single converter.
Solution Approach 2:
The controller continuously monitors the voltage and current output of the power source and uses this feedback information to determine which power converter circuit should be activated. This closed-loop control ensures that the system always operates with the appropriate converter matched to the current power source characteristics, preventing harmful effects from mismatches.
Data Source
AI summary
A wide dynamic range charger module is configured to couple a variable power source such as a photovoltaic cell to a load. The module determines a maximum power point (MPPT) of the power source and based at least in part upon that MPPT selects one of a plurality of power converters to provide power to the load. The selection is such that the selected power converter is operating within its operating regime. The selected power converter may further be configured to a pre-determined input admittance which corresponds to the power source.