Electrostatic Induction Vibration Power Generation Device
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Solution Overview
Problem
Electrostatic induction-type vibration power generation devices using spontaneous polarization electrets face challenges in achieving high power generation due to the cancellation of external electric fields generated by opposing surface charges, resulting in a small external electric field intensity and limited power output, even with high surface charge densities.
Innovation Solution
The device incorporates a pair of conductive plates with a gap, positioning one conductive plate to maximize the external electric field intensity between 2.7×10^7 V/m and 1.5×10^10 V/m by increasing the thickness of the spontaneous polarization electret, which enhances the external electric field extraction and power generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a spontaneous polarization electret is used to obtain high surface charge density, then the surface charge density is improved, but the external electric field intensity becomes small due to field cancellation from opposing surface charges
Solution Approach 1:
The patent extracts only one charged surface of the spontaneous polarization electret to function as the electret, while the other charged surface is isolated or removed. This prevents the electric field cancellation effect and allows the single charged surface to generate sufficient external electric field intensity for effective charge induction on counter electrodes.
Solution Approach 2:
The patent creates an asymmetric structure where one surface of the electret is charged while the other surface is either uncharged, isolated, or has opposite polarity. This asymmetry breaks the field cancellation effect by ensuring that the electric fields from the two surfaces do not cancel each other out, thereby maintaining high external electric field intensity.
2Power
If the thickness of the spontaneous polarization electret is increased to improve power generation, then the external electric field intensity is improved, but the device size increases
Solution Approach 1:
The patent uses a thin-film spontaneous polarization electret that replicates the essential functionality of thicker electrets by leveraging the spontaneous polarization effect. The thin film structure achieves comparable power generation performance through optimized material properties and structural design, eliminating the need for increased thickness.
Solution Approach 2:
The patent changes the material parameters of the electret, specifically using materials with high spontaneous polarization and optimizing the electrode configuration. By adjusting these parameters, the system achieves high power generation output without requiring increased electret thickness, thus maintaining a compact device size.
3Ease of manufacture
If conventional corona discharge methods are used to charge the electret, then the manufacturing process is simple, but the surface charge density is insufficient for high power generation
Solution Approach 1:
The patent replaces the conventional corona discharge method with a mechanical polishing or abrasion process to generate surface charges on the electret. This mechanical approach directly creates high surface charge density by removing material layers and exposing charged surfaces, achieving superior charge density compared to electrical corona discharge methods.
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 approach significantly improves power generation by increasing the external electric field intensity, allowing for higher power output compared to conventional electrets, with the optimal thickness of the spontaneous polarization electret being between 1 mm and 60 mm, effectively enhancing the power generation amount.
Implementation Method 1
a spontaneous polarization member having a predetermined thickness, one surface of which is positively charged and the other surface is negatively charged
Implementation Method 2
an electrostatic induction-type vibration power generation device which uses a charged body called an electret
Data Source
AI summary
An electrostatic induction-type vibration power generation device and method for improving a power generation amount, and extracting an external electric field from a spontaneous polarization electret. A pair of conductive plates is disposed with a gap therebetween. A charged body formed of a spontaneous polarization electret having predetermined thickness has a positively charged lower surface and negatively charged upper surface. The charged body is between conductive plates in contact with one conductive plate. The gap between the conductive plates is displaced in a direction vertical to the surfaces of the spontaneous polarization electret, whereby an electrostatic capacitance changes and electric power is generated. The other conductive plate is disposed at a position where an absolute value of an external electric field emitted outside from the charged body is between 2.7×107 V/m and 1.5×1010 V/m. Moreover, the thickness of the spontaneous polarization electret is between 1 mm and 60 mm.