MEMS Micro-Switch Array for Arc-Free Current Limiting
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Solution Overview
Problem
Conventional circuit breakers are large, slow, complex, and expensive, and they often form arcs during switching, which can be damaging and dangerous, while existing contactors struggle with high fault currents and lack efficient over-current protection mechanisms.
Innovation Solution
A microelectromechanical system (MEMS) micro-switch array based current limiting apparatus that includes a switching circuit with MEMS switches and arc suppression circuitry, allowing for rapid and arc-less switching, integrated with a circuit interrupting component to protect against over-currents and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electromechanical switches are used in circuit breakers, then the switching mechanism can handle high currents, but the device size becomes large and requires large activation force
Solution Approach 1:
The patent replaces conventional electromechanical switches with MEMS (micro-electromechanical system) switches that use electrostatic actuation instead of mechanical movement. The MEMS switches utilize electric fields to control switching, eliminating the need for large mechanical components and reducing device size while maintaining current handling capability through parallel array configuration
Solution Approach 2:
The patent divides the current handling function across multiple MEMS switches arranged in parallel arrays. Each individual MEMS switch handles a portion of the total current, allowing the system to achieve high current capability without requiring each component to be large, thus resolving the contradiction between current handling and device size
2Strength
If conventional electromechanical switches are used in circuit breakers, then the switching mechanism can be robust, but the switching speed becomes slow
Solution Approach 1:
The patent replaces slow mechanical switching with electrostatically actuated MEMS switches that can transition states in microsecond timescales. The electrostatic actuation mechanism eliminates mechanical inertia and friction limitations, achieving switching speeds orders of magnitude faster than conventional electromechanical switches while maintaining structural integrity
3Reliability
If conventional circuit breakers are used, then over-current protection can be provided, but the complexity and fabrication cost increase
Solution Approach 1:
The patent integrates multiple functions into the MEMS switch array structure itself. The same MEMS switches that provide normal circuit switching also provide over-current protection by rapidly opening when fault conditions are detected. This eliminates the need for separate protective mechanisms, reducing overall device complexity and fabrication cost while maintaining protection capability
4Ease of operation
If conventional circuit breakers interrupt current by physically separating contacts, then the circuit can be opened, but arcs are formed between contacts causing damage and danger
Solution Approach 1:
The patent uses electrostatically actuated MEMS switches that can interrupt current without the contacts physically separating in the traditional sense. The electrostatic actuation allows for controlled switching that minimizes arc formation, and the rapid switching speed limits the duration of any arc that does occur, thereby reducing the harmful effects while maintaining circuit opening capability
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 MEMS-based solution provides fast and reliable protection against high fault currents, minimizing damage and risk by rapidly interrupting currents and preventing arc formation, thus enhancing safety and efficiency in electrical systems.
Implementation Method 1
Each MEMS switch in the array is electrostatically actuated
Implementation Method 2
arc suppression circuitry, allowing for rapid and arc-less switching
Data Source
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AI summary
The present invention comprises a micro-electromechanical system (MEMS) micro- switch array based current limiting enabled circuit interrupting apparatus. The apparatus comprising an over-current protective component, wherein the over-current protective component comprises a switching circuit, wherein the switching circuit comprises a plurality of micro-electromechanical system switching devices. The apparatus also comprises a circuit breaker or switching component, wherein the circuit breaker or switching component is in operable communication with the over-current protective component.