Vibration Energy Harvester Using Threshold-Based Impedance Switching
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Solution Overview
Problem
The existing vibration-driven energy harvesting devices face low power extraction efficiency due to suboptimal selection of input impedance, which affects the power generation process.
Innovation Solution
A vibration-driven energy harvesting device that includes a vibration-driven energy harvesting element, an output unit connected to a load resistor, a judgment unit to assess power values against a threshold, a determination unit to calculate and adjust the input impedance based on these judgments, and an adjustment unit to dynamically change the impedance to optimize power extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the input impedance of the output unit is fixed, then the device structure is simple, but the power generation efficiency is low
Solution Approach 1:
The patent implements dynamic impedance adjustment by switching between multiple impedance values based on vibration acceleration levels. The determination unit dynamically selects appropriate impedance values from a plurality of predefined impedance values, and the adjustment unit dynamically changes the input impedance accordingly. This dynamic adaptation resolves the contradiction by allowing the system to optimize power generation efficiency under varying vibration conditions without requiring a completely complex adjustable impedance structure.
Solution Approach 2:
The patent changes the impedance parameter based on vibration acceleration conditions. The determination unit determines appropriate impedance values from multiple predefined options according to the detected vibration acceleration, and the adjustment unit modifies the input impedance parameter to match the determined value. This parameter change approach enables efficient power extraction across different vibration scenarios while maintaining a manageable device architecture.
2Productivity
If the input impedance is adjusted dynamically, then the power generation efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent employs dynamic impedance adjustment through a control system that switches between multiple predefined impedance values based on real-time vibration acceleration detection. The determination unit dynamically selects from a set of impedance values, and the adjustment unit dynamically reconfigures the input impedance accordingly. This dynamic approach maximizes power extraction efficiency across varying operating conditions while avoiding the need for continuously adjustable impedance mechanisms, thereby controlling device complexity.
Solution Approach 2:
The system changes the impedance parameter discretely based on vibration acceleration thresholds. The determination unit compares detected vibration acceleration against reference values and selects from multiple predefined impedance values. The adjustment unit then modifies the input impedance parameter to the selected value. This discrete parameter change strategy achieves high power extraction efficiency while maintaining relatively simple control circuitry compared to continuous adjustment systems.
3Adaptability or versatility
If a single impedance value is used, then the device is easy to manufacture, but the adaptability to different vibration conditions is poor
Solution Approach 1:
The patent implements dynamic adaptability by switching between multiple impedance values based on detected vibration acceleration levels. The determination unit dynamically selects from a plurality of predefined impedance values according to the current vibration conditions, and the adjustment unit dynamically reconfigures the input impedance to match the selected value. This dynamic switching mechanism provides excellent adaptability to various vibration scenarios while maintaining manufacturing simplicity through the use of discrete, predefined impedance values rather than continuously adjustable components.
Solution Approach 2:
The system employs multiple predefined impedance values that can be selected based on vibration acceleration conditions. The determination unit determines the appropriate impedance value from the plurality of predefined options according to the detected vibration level, and the adjustment unit changes the input impedance parameter accordingly. This approach enhances adaptability to different vibration environments while keeping the manufacturing process relatively simple, as it avoids the need for complex continuously variable impedance components.
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
This solution enhances power generation efficiency by dynamically adjusting the input impedance in response to varying vibration accelerations, stabilizing power extraction and maximizing energy harvesting performance.
Implementation Method 1
a vibration-driven energy harvesting element 110 that generates power according to vibrations of an electrode
Data Source
AI summary
A vibration-driven energy harvesting device includes a vibration-driven energy harvesting element that generates power according to vibrations of an electrode; an output unit that, when connected to a load resistor, extracts power generated by the vibration-driven energy harvesting element; a judgment unit that judges whether or not a power value of the power is greater than a predetermined threshold value; a determination unit that determines an input impedance of the output unit based on a judgment result obtained by the judgment unit; and an adjustment unit that adjusts the input impedance of the output unit according to a determination made by the determination unit.