MEMS Switch With Creep-Resistant Conductive Element
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Solution Overview
Problem
Conventional circuit breakers are large, slow, complex, and expensive, with macro-electromechanical switches requiring significant force to activate and often experiencing arc formation that can cause current leakage and damage, while solid-state switches suffer from leakage current and heat dissipation issues, making them unsuitable for circuit breaker applications.
Innovation Solution
A microelectromechanical switch structure featuring a deformable conductive element, such as a cantilever beam, made from creep-resistant metallic alloys like nickel-tungsten, which can store energy to separate and reconnect with a contact under electrostatic force, inhibiting time-dependent deformation and maintaining low leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If macro-electromechanical switches are used in conventional circuit breakers, then the switching mechanism can physically separate contacts to interrupt current, but the device becomes large in size and requires large force to activate
Solution Approach 1:
The patent replaces the traditional macro-electromechanical switching mechanism with a microelectromechanical system (MEMS) based switch. The MEMS switch uses electrostatic forces to actuate a movable contact, eliminating the need for bulky mechanical components and large activation forces while maintaining the ability to physically separate contacts and interrupt current flow.
Solution Approach 2:
The patent transitions from macro-scale to micro-scale dimensions in the switching mechanism. By miniaturizing the switch components to the microelectromechanical level, the circuit breaker achieves compact size while preserving the essential function of physical contact separation for reliable current interruption.
2Reliability
If macro-electromechanical switches are used in conventional circuit breakers, then the switching mechanism can physically separate contacts, but the switching speed becomes relatively slow
Solution Approach 1:
The patent replaces slow macro-electromechanical switching with fast microelectromechanical switching. The MEMS-based switch utilizes electrostatic actuation and elastic recovery of micro-scale components, enabling significantly faster switching speeds while maintaining reliable physical contact separation for current interruption.
3Reliability
If contacts are physically separated in conventional circuit breakers, then current can be interrupted, but an arc can form between contacts allowing current to continue flowing
Solution Approach 1:
The patent addresses arc formation by utilizing the inherent properties of the MEMS switch design. The controlled separation distance and micro-scale geometry of the movable contact in the MEMS switch help minimize arc formation, while the elastic recovery mechanism ensures consistent contact separation that prevents sustained arcing.
4Speed
If solid-state switches are used, then switching speed is fast, but leakage current occurs when the switch is in non-conducting state
Solution Approach 1:
The patent replaces solid-state switches with a microelectromechanical switch that provides true physical contact separation. The MEMS-based movable contact can completely disconnect the circuit, eliminating leakage current issues inherent in solid-state switches while maintaining fast switching speeds through electrostatic actuation.
5Extent of automation
If solid-state switches are used, then switching between conducting and non-conducting states is achieved, but voltage drop and power dissipation occur due to internal resistance
Solution Approach 1:
The patent replaces solid-state switches with a microelectromechanical switch that provides true physical contact separation. The MEMS-based movable contact can completely disconnect the circuit, eliminating leakage current issues inherent in solid-state switches while maintaining fast switching speeds through electrostatic actuation.
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 microelectromechanical switch structure provides fast switching with low resistance and minimal leakage, maintaining a consistent separation distance and preventing time-dependent deformation, thus addressing the limitations of conventional circuit breakers and solid-state switches.
Implementation Method 1
an electrode configured to be charged so as to apply an electrostatic force configured to urge the conductive element toward the second position
Implementation Method 2
The conductive element can be configured to store therein sufficient energy during deformation to cause the conductive element to assume the first position in the absence of external forces
Data Source
AI summary
Provided is a device, such as a switch structure, that includes a contact and a conductive element that is configured to be deformable between a first position in which the conductive element is separated from the contact and a second position in which the conductive element contacts the contact. The conductive element can be formed substantially of metallic material configured to inhibit time-dependent deformation. For example, the metallic material may be configured to exhibit a maximum steady-state plastic strain rate of less than 10ā12 sā1 when subject to a stress of at least about 25 percent of a yield strength of the metallic material and a temperature less than or equal to about half of a melting temperature of the metallic material. The contact and the conductive element may be part of a microelectromechanical device or a nanoelectromechanical device. Associated methods are also provided.