Series-Stacked MEMS Switching Modules With Galvanic Isolation
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Solution Overview
Problem
Existing MEMS-based switching arrays face limitations in achieving voltage scalability due to excessive voltage levels developing across open switches, restricting the number of switches that can be connected in series and preventing the attainment of desired voltage ratings.
Innovation Solution
A system comprising MEMS-based switching modules with galvanically isolated power and control circuitry, allowing any number of modules to be connected in series by propagating power and control signals unaffected by the voltage across open switches, and incorporating a voltage grading network for equal voltage distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple MEMS switches are connected in series to achieve higher voltage rating, then the voltage rating of the array increases, but the voltage levels across open switches exceed the circuitry voltage rating
Solution Approach 1:
The patent introduces an intermediary circuit between series-connected MEMS switches that actively monitors and limits the voltage across each switch. This intermediary circuit prevents excessive voltage buildup by providing a discharge path or clamping mechanism, allowing more switches to be connected in series without exceeding the voltage rating of individual components.
Solution Approach 2:
The patent implements feedback control by monitoring the voltage across each MEMS switch and using this information to control the switching operation. When voltage approaches dangerous levels, the feedback mechanism triggers corrective action such as opening adjacent switches or activating voltage clamping circuits, enabling safe operation of extended series configurations.
2Adaptability or versatility
If more switching modules are connected in series to achieve desired voltage rating, then voltage scalability is improved, but the complexity of power and control signal distribution increases
Solution Approach 1:
The patent divides the power and control signal distribution into segmented, modular units. Each switching module contains its own localized power supply and control logic, eliminating the need for complex long-distance signal distribution. Modules can be connected in series with simple interconnections, and each module independently manages its own power and control signals, greatly simplifying the overall system architecture.
Solution Approach 2:
The patent designs universal switching modules that can operate autonomously with their own integrated power and control systems. Each module is self-contained and can function independently or in series with other identical modules, providing multi-functionality and eliminating the need for complex centralized power and control distribution infrastructure.
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
Enables the connection of any number of modules in series to achieve a desired voltage rating, ensuring voltage scalability and preventing voltage rating exceedance, while maintaining current scalability.
Implementation Method 1
switching circuitry comprising at least one micro-electromechanical system switch for selectively establishing a current path from an input line to an output line of the switch in response to a gate control signal applied to the switch
Implementation Method 2
power circuitry coupled to the control circuitry and the switching circuitry. The power circuitry provides an input terminal pair and an output terminal pair galvanically isolated from one another
Data Source
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AI summary
MEMS-based switching module (e.g., 12, 100), as may be electrically connected to other such modules (14, 16) in a series circuit, to achieve a desired voltage rating is provided. A switching array (10) may be made up of a plurality of such switching modules (e.g., used as building blocks of the switching array) with circuitry (100, 106, 108, 110) configured so that any number of modules can be connected in series to achieve the desired voltage rating (e.g., voltage scalability).