Dynamic Sampling Duration Control for Power Transfer Efficiency
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Solution Overview
Problem
Existing energy harvesting systems face inefficiencies due to mismatched load current or voltage requirements with energy sources like photovoltaic (PV) devices, leading to suboptimal energy conversion and power transfer efficiencies, particularly because fixed measurement durations for open-circuit voltage determination can result in prolonged disconnection of the load and potential measurement errors.
Innovation Solution
Dynamic adjustment of measurement duration and proportionality constant 'K' based on environmental changes such as irradiance and temperature to enhance power transfer efficiency, allowing for real-time optimization of energy transfer between energy sources and loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed measurement duration is used for open-circuit voltage determination, then measurement simplicity is maintained, but power transfer efficiency deteriorates due to prolonged load disconnection
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed measurement duration to a variable measurement duration that adapts based on environmental conditions. The controller dynamically adjusts the sampling duration of open-circuit voltage measurements according to detected changes in irradiance or temperature, allowing the system to optimize between measurement accuracy and power transfer efficiency under varying operating conditions.
2Measurement precision
If a long measurement duration is used, then measurement precision improves, but system efficiency deteriorates due to extended load disconnection time
Solution Approach 1:
The patent applies partial action by using a variable measurement duration that is adjusted based on environmental conditions. Rather than always using a fixed long measurement duration, the system uses only the necessary measurement time required under current conditions, reducing unnecessary disconnection time while maintaining adequate measurement precision when needed.
Solution Approach 2:
The patent applies parameter changes by modifying the measurement duration parameter dynamically. The controller changes the sampling duration parameter based on detected environmental conditions (irradiance or temperature changes), allowing the system to adapt measurement precision requirements to actual operating conditions and minimize efficiency losses.
3Productivity
If a short measurement duration is used, then power transfer efficiency improves by reducing disconnection time, but measurement precision deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the measurement duration parameter based on environmental conditions. When environmental conditions are stable, the system uses shorter measurement durations to maintain efficiency. When environmental conditions change significantly, the system extends the measurement duration to ensure adequate precision, thus adapting the parameter to balance efficiency and accuracy requirements.
Data Source
AI summary
Apparatus and techniques for controlling measurement of an electrical parameter of an energy source can be used to obtain information for use in enhancing a power transfer efficiency between the energy source and a load. For example, during a first measurement cycle, information indicative of the electrical parameter of the energy source can be obtained using a measurement circuit during a first sampling duration in which the load is decoupled from the energy source. The information indicative of the obtained electrical parameter can be compared to a threshold. In response to the comparing, a different second sampling duration can be determined for use in obtaining information indicative of the electrical parameter during a subsequent measurement cycle. The information indicative of the electrical parameter of the energy source includes information for use in enhancing the power transfer efficiency between the energy source and the load.