Electret Vibration Power Generator Parasitic Capacitance
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Solution Overview
Problem
Conventional vibration power generators using electrets inefficiently supply generated power to the load due to parasitic capacitance issues, where charge migrates between electrodes and ground, limiting power supply efficiency.
Innovation Solution
The vibration power generator configures current collecting electrodes and a ground electrode on a substrate opposite to the electrets, with the power supply load connected to each current collecting electrode, and the ground electrode disposed between them to reduce parasitic capacitance voltage, ensuring smooth power supply to the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pair of electrodes are arranged on a substrate opposite to the electret substrate, then charge can be collected by the electrodes, but the utilization efficiency of the substrate surfaces is low because charge migrates between electrodes and ground rather than to the power supply load
Solution Approach 1:
The electrode array is segmented into three distinct types: first current collecting electrodes, second current collecting electrodes, and ground electrodes. This segmentation allows charge to be directed to multiple power supply loads through different electrode paths, preventing charge from migrating between adjacent electrodes and ground, thereby improving power supply efficiency and reducing energy loss.
2Productivity
If the ground electrode is disposed between the current collecting electrodes, then voltage application to parasitic capacitance is prevented and charge flows smoothly to the power supply load, but the device structure becomes more complex
Solution Approach 1:
The ground electrode acts as an intermediary element disposed between the first and second current collecting electrodes. This intermediary structure prevents voltage application to parasitic capacitance sections that would form between adjacent current collecting electrodes, thereby enabling smooth charge flow to power supply loads. While the electrode configuration becomes more complex, the overall system performance improves significantly.
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 configuration significantly enhances the efficiency of power supply to the load by reducing the hindrance caused by parasitic capacitance, allowing generated power to be effectively utilized by the power supply load, potentially doubling the power supply capability compared to conventional designs.
Implementation Method 1
a vibration power generator utilizing an electret and including a pair of opposite movable substrates that reciprocate in order to generate power, an electret on a surface of one of the substrates
Implementation Method 2
charge generated by the action of the electret
Data Source
AI summary
Power generated by a vibration power generator using an electret is efficiently supplied to a power supply load. A vibration power generator includes a first substrate and a second substrate configured to be moved relative to each other by external vibration while remaining opposite each other, a group of a plurality of electrets arranged in the relative movement direction on one surface side of the first substrate, and a group of a plurality of electrodes arranged in the relative movement direction on a surface side of the second substrate opposite to the group of electrets, the group of electrodes including first current collecting electrodes and second current collecting electrodes electrically connected to respective power supply loads to which power generated by the external vibration is supplied, and ground electrodes each provided between the first current collecting electrode and the second current collecting electrode and grounded.