Series-Parallel MEMS Switch Protection Circuit
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Solution Overview
Problem
Conventional circuit breakers, including electromechanical and solid-state switches, face challenges in handling high currents and voltage, leading to potential damage and inefficiencies due to asynchronous switching and leakage currents, necessitating enhanced protection mechanisms for micro-electromechanical system (MEMS) based switching devices.
Innovation Solution
The implementation of a series configuration of MEMS-based parallel switch sets with a protection circuitry that includes diodes and a control circuit to manage voltage and current, utilizing Hybrid Arc Limiting Technology (HALT) and Pulse Assisted Turn On (PATO) to ensure equal voltage distribution and divert excessive current away from the switches, employing a grading network with resistors, capacitors, and non-linear voltage clamping devices to absorb inductive energy and suppress voltage spikes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If solid-state switches are used in series parallel topology to handle higher voltage and current, then voltage and current handling capabilities are improved, but asynchronous switching of switch arrays causes excessive load current flow rendering switches inoperable
Solution Approach 1:
The patent applies preliminary action by implementing a control circuit that synchronizes the switching operations of multiple switch arrays before they are subjected to full load current. The control circuit pre-coordinates the opening and closing timing of switches in series-parallel topology, ensuring that no excessive current flows through individual switches during transitions. This preliminary synchronization prevents operational failure before it occurs.
Solution Approach 2:
The control circuit acts as an intermediary between the power source and the switch arrays, mediating the switching operations to distribute and balance the current flow. It monitors and adjusts the switching timing of each array to prevent any single array from bearing excessive load current, thereby protecting the switches while maintaining high power handling capability.
2Ease of operation
If electromechanical contactors are used for switching, then switching capability is improved, but large size necessitates use of large force to activate switching mechanism
Solution Approach 1:
The patent segments the single large electromechanical contactor into multiple smaller switch arrays connected in series-parallel topology. Each array contains multiple switches that operate independently but are coordinated by a control circuit. This segmentation reduces the activation force required for each individual switch while maintaining the overall switching capability through coordinated operation of multiple smaller units.
Solution Approach 2:
The patent merges multiple smaller switch arrays to achieve the cumulative switching capability of a single large contactor. By combining the switching actions of several smaller switches in series-parallel configuration, the system achieves equivalent or superior switching performance while requiring significantly less activation force per switch and enabling more efficient actuation.
3Speed
If solid-state switches are used to achieve fast switching, then switching speed is improved, but leakage current occurs because no physical gap is created between contacts
Solution Approach 1:
The control circuit serves as an intermediary that manages current flow paths through the solid-state switches. It implements control strategies that minimize leakage current by optimizing the timing and sequencing of switch operations, ensuring that switches transition through non-conducting states in a coordinated manner that reduces parasitic current flow while maintaining fast switching response.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the voltage and current parameters applied to solid-state switches during transitions. The control circuit modifies switching waveforms, transition times, and bias conditions to optimize the balance between fast switching and leakage current reduction, exploiting the voltage-dependent characteristics of solid-state switch behavior.
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
This configuration enhances the protection of MEMS switches by ensuring equal voltage distribution, reducing the risk of damage from excessive currents and voltage spikes, and maintaining the operational integrity of the switching array by effectively managing current flow during switching operations.
Implementation Method 1
one or more intermediate diodes coupled between the control circuit and each point between a respective pair of switch sets
Implementation Method 2
employing a grading network with resistors, capacitors, and non-linear voltage clamping devices to absorb inductive energy and suppress voltage spikes
Implementation Method 3
employing a grading network with resistors, capacitors, and non-linear voltage clamping devices to absorb inductive energy and suppress voltage spikes
Implementation Method 4
employing a grading network with resistors, capacitors, and non-linear voltage clamping devices to absorb inductive energy and suppress voltage spikes
Data Source
AI summary
An electrical switching device is presented. The electrical switching device includes multiple switch sets coupled in series. Each of the switch sets includes multiple switches coupled in parallel. A control circuit is coupled to the multiple switch sets and configured to control opening and closing of the switches. One or more intermediate diodes are coupled between the control circuit and each point between a respective pair of switch sets.