Capacitor Circuit for Microbial Fuel Cell Voltage Reversal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In-series microbial fuel cell systems are limited by voltage reversal, which prevents stable operation and damages electrode systems, especially when one battery or fuel cell malfunctions, and attempts to overcome low voltage issues have been unsuccessful.
Innovation Solution
An electronic circuit using sets of capacitors and switches that charge and discharge in parallel and series configurations respectively, preventing voltage reversal by alternating the roles of capacitors to stabilize energy output from multiple power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple MFCs are arranged in series to increase output voltages, then voltage output is improved, but voltage reversal occurs due to imbalance in organic matter concentration and high current conditions
Solution Approach 1:
The system segments the series-connected MFCs into parallel groups, each group charging capacitors independently. This segmentation prevents voltage reversal by isolating the electrical pathways of individual MFCs while still achieving voltage multiplication through the capacitor bank configuration.
Solution Approach 2:
Capacitors are introduced as intermediary energy storage devices between the MFCs and the load. The capacitors buffer the electrical output, allowing MFCs to charge them in parallel without direct series connection, thereby eliminating voltage reversal while maintaining voltage multiplication capability.
2Productivity
If MFCs operate under high current conditions to increase power output, then productivity is improved, but voltage reversal is induced
Solution Approach 1:
The capacitors are pre-charged by MFCs operating in parallel at high current without voltage reversal. This preliminary charging action stores energy in the capacitors, which then discharge in series to provide high voltage to the load, decoupling the high current operation from the high voltage delivery.
Solution Approach 2:
The system operates in periodic cycles where MFCs charge capacitors during one phase and capacitors discharge to the load during another phase. This periodic operation allows high current charging without voltage reversal followed by high voltage discharge to the load.
3Reliability
If one battery or fuel cell malfunctions in a series system, then system stability deteriorates, but voltage reversal damages electrode systems
Solution Approach 1:
The system segments the power source array into independent parallel units, each capable of charging capacitors independently. If one MFC malfunctions, only that unit is affected while others continue operating, preventing system-wide voltage reversal and electrode damage.
Solution Approach 2:
The capacitor bank serves as a cushioning energy buffer between the MFCs and the load. This cushioning arrangement protects against voltage reversal by preventing direct series interaction between MFCs, thereby shielding electrode systems from damaging reverse voltages even when individual MFCs malfunction.
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 solution effectively increases voltage and maintains stable energy output by preventing voltage reversal, allowing for efficient energy harvesting from microbial fuel cells without significant energy losses, even under imbalanced conditions.
Implementation Method 1
a first set of capacitors and a second set of capacitors... The first set of capacitors is connected to the at least one energy source in parallel
Implementation Method 2
the second set of capacitors is connected to the external load in series... providing for alternately charging the first and second set of capacitors
Data Source
AI summary
An electronic circuit to increase voltages from one or more energy sources. The electronic circuit can include a first set of capacitors and a second set of capacitors, and a first set of switches associated with the first set of capacitors and a second set of switches associated with the second set of capacitors. Also included is at least one energy source and an external load. The first and second set of capacitors, first and second set of switches, the at least one energy source, and the external load are arranged and connected such that the first set of capacitors is connected to the at least one energy source in parallel while the second set of capacitors is connected to the external load in series, and vice versa.