Electrostatic Induction Generator Parasitic Capacitance Reduction
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Solution Overview
Problem
Existing electrostatic induction generators face inefficiencies in power generation due to parasitic capacitance, particularly between electrodes, which degrades output power despite attempts to increase amplitude or decrease pitch, and miniaturization limits further adjustments.
Innovation Solution
A structure that decreases electrostatic capacitance between electrodes by modifying the positional relationship and permittivity, such as through holes, recesses, or low-permittivity layers between electrodes, to reduce parasitic capacitance and enhance power generation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the pitch between the electrets is decreased to increase output power according to the equation, then the calculated output power increases, but the actual output power does not increase due to parasitic capacitance degradation
Solution Approach 1:
The patent extracts and removes the parasitic capacitance component by providing a discharge path between the first electrode and second electrode through a resistance. This allows the harmful parasitic capacitance to be discharged, separating its effect from the useful electrostatic capacitance between the electret and electrodes, thereby resolving the contradiction between increasing output power and maintaining power generation efficiency
Solution Approach 2:
The patent introduces a resistance as an intermediary element between the first electrode and second electrode. This resistance serves as a mediator that provides a controlled discharge path for the parasitic capacitance, allowing the system to manage the harmful capacitance effect without compromising the useful electrostatic induction mechanism
2Power
If the amplitude of the pair of substrates is increased to enhance output power, then the output power increases according to the equation, but the amplitude cannot be increased due to miniaturization requirements
Solution Approach 1:
The patent changes the electrical parameters of the system by managing parasitic capacitance through discharge paths. This allows the system to optimize power generation efficiency through electrical parameter control rather than mechanical parameter changes, enabling miniaturization without sacrificing output power
3Loss of energy
If a structure is provided between the first electrode and second electrode to decrease electrostatic capacitance, then parasitic capacitance is reduced and power generation efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by providing the discharge path structure only in specific regions where parasitic capacitance is generated, rather than modifying the entire device. The resistance is strategically placed between the first electrode and second electrode to target the parasitic capacitance location, improving efficiency without unnecessarily increasing overall device complexity
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
The proposed solution effectively improves power generation efficiency by reducing parasitic capacitance between electrodes, allowing for stable and increased output voltage, even in miniaturized designs.
Implementation Method 1
an electrostatic capacitance between one of the pair of electrodes and the electret and an electrostatic capacitance between the other electrode and the electret change by the relative movement of the pair of substrates respectively, whereby the change amount is output as an electric power
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(c)
Figure 3
AI summary
The present invention is to provide an electrostatic induction generator that achieves improvement of power generation efficiency. An electrostatic induction generator 100 includes: a first substrate 10 and a second substrate 20, which can move relatively while remaining opposed to each other; an electret 13 that is provided in the first substrate 10; and a first electrode 21 and a second electrode 22, which are provided on a surface side opposed to the electret 13 in the second substrate 20. In the electrostatic induction generator 100, an electrostatic capacitance between the electret 13 and the first electrode 21 and an electrostatic capacitance between the electret 13 and the second electrode 22 change to output an electric power, and a structure that decreases the electrostatic capacitance between the first electrode 21 and the second electrode 22 is provided between the electrodes.