Floating Electrode Capacitor Leakage Current
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Solution Overview
Problem
Capacitors face a trade-off between increasing energy storage capacity and maintaining insulation resistance, as adding more active electrodes tends to increase leakage current and reduce effective insulation resistance.
Innovation Solution
Incorporating a floating electrode between active electrodes, which induces charge separation and creates a reverse electric field that opposes leakage current, allowing for an increase in the number of active electrodes without significantly reducing insulation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of active electrodes is increased to improve energy storage capacity, then capacitance increases, but leakage current increases and insulation resistance decreases
Solution Approach 1:
A floating electrode is introduced as an intermediary element between active electrodes. This floating electrode induces charge separation that creates a reverse electric field, which acts as a mediator to oppose leakage current while allowing the capacitor to maintain high capacitance through multiple active electrodes.
Solution Approach 2:
The floating electrode creates a reverse electric field in advance that opposes the leakage current before it can flow. This preliminary counter-action prevents the degradation of insulation resistance that would normally occur when increasing the number of active electrodes.
2Quantity of substance
If the thickness of the dielectric material is decreased to increase capacitance, then capacitance increases, but leakage current increases
Solution Approach 1:
The floating electrode serves as an intermediary that generates a reverse electric field, compensating for the increased leakage current that results from using thinner dielectric material. This allows the capacitor to achieve high capacitance without suffering from excessive leakage.
3Quantity of substance
If the number of active electrodes is increased to improve energy storage capacity, then energy storage capacity increases, but energy storage time decreases due to increased leakage
Solution Approach 1:
The reverse electric field generated by the floating electrode acts in advance to counteract leakage current, preventing energy loss over time. This maintains energy storage time even as the number of active electrodes and total energy storage capacity increase.
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 effectively increases energy storage capacity while maintaining nearly constant insulation resistance and reducing leakage current, thereby improving energy storage times.
Implementation Method 1
When the floating electrode is subjected to an electric field (e.g., when voltage is applied to the active electrodes), charge separation is induced in the floating electrode
Implementation Method 2
The charge separation provides a reverse electric field (e.g., field that is opposite the electric field between the active electrodes)
Data Source
AI summary
A capacitor includes a first conductive plate, a second conductive plate, a floating conductive plate and a dielectric material separating the floating conductive plate from the first conductive plate and from the second conductive plate. The floating conductive plate has a first surface closer to the first conductive plate than to the second conductive plate and has a second surface closer to the second conductive plate than to the first conductive plate. In response to an electric field between the first conductive plate and the second conductive plate, charge separation is induced in the floating conductive plate such that a first charge induced on the first surface has a first polarity and a second charge induced on the second surface has a second polarity, where the second polarity different from the first polarity.