MEMS Fault Interruption Switch for Electrical System Protection
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Solution Overview
Problem
MEMS switches experience reliability issues due to mechanical wear, stuck closed contacts, and other failure modes, which can cause damage to electrical systems if not properly detected and managed.
Innovation Solution
An electrical system incorporating a fault interruption MEMS switch unit with a control system that senses system variables to detect faults and selectively opens a fault isolation MEMS switch to interrupt current flow, preventing damage to the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fault interruption MEMS switch unit is added to detect and interrupt faults, then system reliability is improved, but device complexity increases
Solution Approach 1:
The fault interruption MEMS switch unit is nested within the existing MEMS switch architecture. The fault isolation switch is integrated into the electrical path alongside operational switches, creating a hierarchical structure where fault protection is embedded within the switch matrix without requiring a completely separate protection system.
Solution Approach 2:
The fault sensor acts as an intermediary between the electrical system and the control system. It monitors system variables and translates fault conditions into signals that the control system can process, enabling indirect fault detection without requiring direct intervention in the electrical path.
2Object-affected harmful factors
If fast fault interruption is implemented using MEMS switches, then damage prevention is improved, but manufacturing cost increases
Solution Approach 1:
The fault isolation MEMS switch is designed with the same structure and fabrication process as operational MEMS switches. This universal design allows the fault protection function to be manufactured using existing MEMS production lines, reducing additional manufacturing costs while maintaining fast interruption capability.
Solution Approach 2:
The patent utilizes the inherent fast switching parameters of MEMS technology to achieve rapid fault interruption. By leveraging the natural response time characteristics of MEMS switches rather than requiring additional active components, the solution maintains cost-effectiveness while providing fast damage prevention.
3Measurement precision
If continuous monitoring of system variables is performed, then fault detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The control system periodically monitors system variables through the fault sensor rather than continuously. This periodic sampling approach maintains adequate fault detection accuracy while reducing energy consumption compared to continuous monitoring, striking a balance between detection precision and power usage.
Solution Approach 2:
The fault sensor automatically monitors system variables and the control system autonomously processes fault detection and triggers interruption when needed. This self-service mechanism eliminates the need for additional active monitoring components that would consume extra energy, as the system uses its existing control infrastructure for fault detection.
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 solution effectively and rapidly isolates electrical loads from power sources during fault conditions, enhancing system reliability and reducing the risk of further damage, while being cost-effective and integrating seamlessly with existing MEMS switch architectures.
Implementation Method 1
a first fault sensor positioned to sense a first system variable
Implementation Method 2
switch the first fault interruption MEMS switch from the on state to the off state to interrupt current flowing through the first operation MEMS switch
Implementation Method 3
the contacting of the free-standing structure with the substrate contact can cause the free-standing structure (i.e., a contact of the free-standing structure) to experience mechanical wear due to repeated physical impact with the substrate contact
Implementation Method 4
heating of the free-standing structure contact by joule heating
Implementation Method 5
electrical discharges between the free-standing structure contact and the substrate contact
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
An electrical system includes an operation MEMS switch operable in on and off states to enable and disable current flow to a load and a fault interruption MEMS switch positioned in series with the operation MEMS switch. The fault interruption MEMS switch is operable in on and off states to enable and disable current flow to the electrical load, with operation of the fault interruption MEMS switch in the off state disabling current flow to the load regardless of the state of the operation MEMS switch. A fault sensor control system operate to sense a system variable, analyze the system variable to detect if a fault is affecting the electrical system and, upon detection of a fault, switch the fault interruption MEMS switch from the on state to the off state to interrupt current flowing through the operation MEMS switch to the load.