MEMS Teeter-Totter Circuit Breaker for High-Voltage Switching Reliability
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Solution Overview
Problem
MEMS switches face challenges in reliably operating between input and output terminals with large voltage differences for extended periods due to structural degradation from repeated switching operations.
Innovation Solution
A MEMS switch design featuring a conductive beam anchored by a conductive post, with a mechanical stopper and control electrodes, allowing the beam to tilt and form conductive paths while minimizing elastic deformation and stress, enabling high voltage and current applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MEMS switch structure is used for repeated switching operations, then switching functionality is achieved, but structural degradation occurs over time
Solution Approach 1:
The patent replaces traditional mechanical contact-based switching with electrostatic actuation of a conductive beam. The beam is pulled toward a contact electrode by electrostatic force when voltage is applied, creating a contactless switching mechanism that eliminates mechanical wear and structural degradation from repeated operations.
Solution Approach 2:
The patent modifies the mechanical parameters of the conductive beam including its thickness, width, and material composition to optimize the balance between mechanical strength and electrostatic actuation response. These parameter changes enable the beam to withstand repeated switching cycles without degradation while maintaining reliable switching functionality.
2Reliability
If conductive beam is designed for high voltage handling, then voltage difference capability is improved, but mechanical stress and elastic deformation increase
Solution Approach 1:
The patent employs composite material structures for the conductive beam, combining materials with high electrical conductivity and high mechanical strength. This composite approach allows the beam to handle high voltage differences while maintaining structural integrity and minimizing elastic deformation under electrical and mechanical stress.
Solution Approach 2:
The patent designs the conductive beam with optimized curved or tapered geometries rather than straight rigid structures. These curved configurations help distribute mechanical stress more evenly throughout the beam structure, reducing peak stress concentrations that would lead to deformation or failure under high voltage conditions.
3Reliability
If conductive beam contacts contact electrode, then conductive path is formed, but arcing and electrical stress occur
Solution Approach 1:
The patent replaces traditional mechanical contact switching with electrostatic actuation. The conductive beam is pulled toward the contact electrode by electrostatic force to form a conductive path, but the contactless nature of the actuation mechanism eliminates arcing and electrical stress that would occur with conventional mechanical contactors.
Solution Approach 2:
The patent introduces an electrostatic field as an intermediary between the control signal and the conductive beam actuation. This electrostatic field mediates the switching action by pulling the beam toward the contact electrode without requiring direct mechanical contact or causing arcing, thereby forming a clean conductive path.
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 design enhances the reliability and durability of MEMS switches by reducing mechanical stress and preventing arcing, allowing them to handle higher voltages and currents effectively.
Implementation Method 1
a first control electrode disposed between the conductive post and the first contact electrode, and a second control electrode disposed between the conductive post and the second contact electrode, wherein each of the first and second control electrodes forms a respective capacitor with the conductive beam
Implementation Method 2
a mechanical stopper formed at a bottom surface of the conductive beam and extending towards the substrate, wherein upon activation of the MEMS switch, the conductive beam is configured to tilt such that one side of the conductive beam contacts one of the pair of contact electrodes to form a further conductive path, and the mechanical stopper is configured to substantially suppress an elastic deformation of one or both of the conductive beam and the conductive post
Data Source
AI summary
Circuit breakers based on micro-electromechanical systems (MEMS) switches are described. A high voltage MEMS teeter-totter switch can include a beam coupled to an anchor on a substrate and two control electrodes, disposed on a surface of the substrate. A control voltage applied on one of the control electrodes with respect to a first reference voltage puts one of the two ends of the beam in electric contact with one of two contact electrodes of the MEMS teeter-totter switch to electrical connected two terminals of a circuit breaker. The input voltage is applied on the beam with respect to a second reference voltage different from the first reference voltage. A MEMS teeter-totter switch network comprises a plurality of MEMS teeter-totter switches configured to switch high voltage and high current between the two terminals of the circuit breaker.