Capacitive Coupling for Conductors in Electrolyte Solutions
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Solution Overview
Problem
Current methods for supplying electrical energy through conductors adjacent to electrolyte solutions often result in parasitic currents and undesirable electrochemical reactions, leading to conductor degradation and system inefficiencies, particularly in applications like inkjet printheads where conductors are exposed to aqueous or non-aqueous electrolytes.
Innovation Solution
A system and method that control the potential difference waveforms applied between electrical conductors to maintain the sum of absolute potential differences across double layers below the threshold overpotential, using capacitive coupling and resistive discharge to prevent net charge injection into the electrolyte solution, thereby suppressing irreversible electrochemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrical energy is supplied through conductors adjacent to electrolyte solution, then devices can be powered in wet environments, but parasitic currents and electrochemical reactions occur causing conductor degradation
Solution Approach 1:
The patent introduces an insulating coating layer as an intermediary between the electrical conductor and the electrolyte solution. This coating acts as a mediator that allows the conductor to function in wet environments while preventing direct contact that would cause parasitic currents and electrochemical reactions, thereby resolving the contradiction between ease of operation and reliability
Solution Approach 2:
The patent applies a thin insulating coating film on the conductor surface. This thin film provides electrical isolation from the electrolyte solution, preventing harmful electrochemical reactions while maintaining the conductor's ability to transmit electrical energy, thus solving the reliability issue without compromising the ability to power devices in wet environments
2Power
If potential difference exceeds overpotential threshold, then electrical energy can be effectively supplied to device, but electrochemical reactions occur causing irreversible degradation
Solution Approach 1:
The insulating coating serves as a mediator that decouples the relationship between applied potential difference and electrochemical reactions. It allows high potential differences to be applied for effective power supply while preventing the threshold overpotential from being exceeded at the conductor-electrolyte interface, thus eliminating harmful electrochemical reactions
Solution Approach 2:
The patent changes the electrical parameters at the conductor interface by introducing the insulating coating. This modifies the potential distribution and prevents the local potential difference from exceeding the overpotential threshold, allowing effective power supply without triggering electrochemical reactions
3Reliability
If conductors are coated with insulating material, then electrochemical reactions are prevented, but electrical connection reliability may be compromised
Solution Approach 1:
The patent segments the conductor surface into coated and uncoated regions. The insulating coating covers most of the surface to prevent electrochemical reactions, while leaving specific contact areas uncoated to maintain reliable electrical connections, thus resolving the contradiction between protection and connectivity
Solution Approach 2:
The patent applies different properties to different parts of the conductor: insulating coating on the bulk surface for protection, and exposed conductive material at contact points for electrical connection. This local differentiation resolves the contradiction between preventing electrochemical reactions and maintaining electrical connectivity
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 reduces electrochemical degradation of conductors and improves system reliability and efficiency by preventing irreversible reactions and maintaining system performance, even in environments where conductors are exposed to electrolytes.
Implementation Method 1
A capacitor couples a first electrical conductor in the first pair to the at least one power source
Implementation Method 2
a sum of (i) an absolute value of a potential difference across a double layer associated with the first electrical conductor and (ii) an absolute value of a potential difference across a double layer associated with a second electrical conductor in the first pair
Implementation Method 3
Aqueous environments, with the exception of pure water, are electrically conducting due to the presence of solvated ions therein
Data Source
AI summary
Systems and methods for controlling supply of electrical energy from power source(s) through a plurality of electrical conductors adjacent to a common electrolyte solution are disclosed. The power source(s) are controlled to apply potential difference waveform(s) between pairs of electrical conductors formed from the plurality of electrical conductors such that the potential difference waveform(s) have a magnitude that exceeds a threshold overpotential for the pairs of electrical conductors in the electrolyte solution while sums of an absolute value of a potential difference across a double layer associated with the first electrical conductor in a pair and an absolute value of a potential difference across a double layer associated with a second electrical conductor in the pair is maintained below the threshold overpotential. Some or all electrical conductor(s) can be coupled to the power source(s) using respective capacitor(s).