MEMS Switching Array Gate Circuitry for Inductive Voltage Surge Mitigation
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Solution Overview
Problem
Micro-electro-mechanical systems (MEMS) switch arrays face reliability issues due to unacceptably high voltages developing during the opening of switches, leading to arcing and welding between electrical contacts, which results in uncontrolled variation in electrical contact resistance and potential permanent seizure of contacts.
Innovation Solution
A MEMS switching array with circuitry coupled to the gate line to adjust the temporal distribution of the gating signal applied to the switches, reducing voltage surges by shaping the opening time distribution of individual switches to mitigate inductive voltage surges within the HALT circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the MEMS switch array opens from an energized state rapidly, then the switching speed is improved, but high voltage surges develop causing arcing and welding between electrical contacts
Solution Approach 1:
The patent applies preliminary action by sequentially opening switches in the MEMS array before the full current interruption occurs. The gate driver circuitry is configured to apply gating signals that cause switches to open in a predetermined sequence, spreading the current interruption over time. This preliminary staged opening prevents sudden complete current interruption that would cause voltage surges and arcing, while still achieving the desired switching function.
2Reliability
If the switching opening time is extended to reduce voltage surges, then the reliability is improved, but the switching speed decreases
Solution Approach 1:
The patent applies dynamics by making the switching sequence adaptive and controllable. The gate driver circuitry can dynamically adjust the timing and distribution of gating signals to individual switches based on operational conditions. This dynamic control allows optimization of the opening sequence to minimize voltage surges while maintaining acceptable switching speed, rather than using a fixed slow sequence.
3Device complexity
If simultaneous switching of all switches is used, then the circuit complexity is minimized, but voltage surges cause arcing and welding
Solution Approach 1:
The patent applies segmentation by dividing the simultaneous switching action into multiple sequential stages. Instead of applying a single gating signal to all switches at once, the gate driver circuitry segments the switching event by applying gating signals to different switches at different times according to a predetermined sequence. This segmentation of the switching process reduces the magnitude of voltage surges by preventing complete current interruption from occurring instantaneously across all switches.
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 minimizes inductive voltage surges across MEMS switches, ensuring they operate below the melt voltage, thereby preventing damage and enhancing the reliability and longevity of the switch array.
Implementation Method 1
The device may further include an actuation mechanism, which actuation mechanism may be electrostatic, to cause a movement of the suspended connecting member
Implementation Method 2
The temporal distribution may be shaped to reduce a voltage surge that can develop in at least some of the plurality of MEMS switches during the switch of current
Data Source
AI summary
A Micro-electro-mechanical systems (MEMS) switching array includes circuitry, which may be coupled to a gate line of the array to adjust a temporal distribution of a gating signal applied to a plurality of MEMS switches that make up the switching array. The temporal distribution may be shaped to reduce a voltage surge that can develop in the switches during switching of electrical current. This voltage surge reduction is conducive to improving the durability of the array.