Variable Inductor via Electrochemically Controlled Capillarity
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Solution Overview
Problem
Conventional reconfigurable electrical circuit components have limited versatility and range of states due to the complexity introduced by liquid metal systems, which require closed fluid paths and mechanical elements, limiting device topology and precision.
Innovation Solution
A variable inductor using a capillary with eutectic conductive liquid containing suspended magnetic particles, where the length of the liquid is controlled by DC voltage between electrodes, allowing for adjustable inductance without the need for mechanical components, enabling precise inductance tuning in reconfigurable circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If liquid metal systems are used to control inductance, then the range and precision of inductance adjustment is improved, but the device complexity increases due to required pumps and microfluidic elements
Solution Approach 1:
The patent extracts and eliminates the complex pump and microfluidic control systems from the liquid metal actuation mechanism. Instead, it uses a simple electrochemical cell with electrodes that directly control the oxidation state of gallium, enabling precise length control through voltage application without mechanical pumping components.
Solution Approach 2:
The patent replaces the mechanical pump and microfluidic valve system with an electrochemical control system. By applying voltage to electrodes in contact with the gallium, the oxidation state changes, controlling the liquid metal's length through electrochemical reactions rather than mechanical fluid handling.
2Device complexity
If conventional switched electro-mechanical circuit elements are used, then the device structure is simpler, but the number and range of states are limited
Solution Approach 1:
The patent implements a dynamic, continuously adjustable inductance system using liquid metal whose length can be precisely controlled by voltage. This replaces static switched electro-mechanical elements with a dynamic system that can assume any state within a continuous range, enabling versatile reconfiguration without complex switching networks.
Solution Approach 2:
The patent changes the physical state and length of the gallium liquid metal through electrochemical oxidation and reduction. By controlling the oxidation state via applied voltage, the inductance value can be continuously adjusted across a wide range, providing adaptability without increasing structural complexity.
3Ease of operation
If EGaIn is injected into capillaries pre-filled with electrolyte to avoid adhesion, then the liquid metal flow is improved, but the integration with electrical circuit components becomes more complex
Solution Approach 1:
The patent merges the electrolyte filling and electrical control functions into a single integrated structure. The electrolyte that prevents gallium adhesion also serves as the conductive medium for electrical control, eliminating the need for separate control wiring and simplifying the overall device integration.
Solution Approach 2:
The electrolyte serves multiple functions simultaneously: it prevents gallium oxide adhesion to capillary walls, provides ionic conductivity for electrochemical control, and acts as the medium for voltage application. This multi-functionality reduces the number of separate components needed and simplifies device integration.
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 solution provides a versatile and precise method to adjust inductance values in real-time, suitable for applications like DC-DC power converters and RF filters, while avoiding the complexity of mechanical systems and maintaining device reliability.
Implementation Method 1
Variable inductor through electrochemically controlled capillarity
Implementation Method 2
The electrolyte forms a slip layer between the oxide and the walls of the capillary
Implementation Method 3
an inductor coil disposed around the capillary
Implementation Method 4
the eutectic liquid comprising suspended magnetic particles
Data Source
AI summary
Embodiments herein describe a variable inductor containing a capillary. The capillary includes an eutectic conductive liquid (e.g., EGaIn) containing suspended magnetic particles and an electrolyte (e.g., NaOH). In one embodiment, the variable inductor has a pair of electrodes (e.g., negative and positive electrodes) at the respective ends of the capillary to seal the eutectic conductive liquid and the electrolyte. The variable inductor also includes an inductor coil disposed around the capillary, and the inductor coil is connected to a circuit and provides inductance for the connected circuit. Using a DC voltage between the pair of electrodes, the eutectic conductive liquid can extend inside the capillary, which in turn, causes the variable inductor to have a desired inductance.