Microelectromechanical Switch With Arc Suppression Diode Bridge
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Solution Overview
Problem
Conventional circuit breakers are large, slow, complex, and expensive, with macro-electromechanical switches requiring significant force to activate and often experiencing arc formation that can cause damage and safety hazards, while solid-state switches suffer from leakage current and heat dissipation issues, making them unsuitable for circuit breaker applications.
Innovation Solution
A microelectromechanical switch structure with an electromechanical switch module that moves between open and fully-closed configurations within 15 microseconds, featuring a balanced diode bridge and pulse circuit to suppress arc formation and minimize inductance, allowing for rapid switching with low resistance and reduced power dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If macro-electromechanical switches are used in conventional circuit breakers, then the switching mechanism can physically separate contacts to interrupt current flow, but the device becomes large in size, requires large activation force, operates slowly, and may experience arc formation
Solution Approach 1:
The patent replaces traditional macro-electromechanical switching mechanisms with a microelectromechanical system (MEMS) based switch. The MEMS switch uses electrostatic forces to actuate micro-scale contacts rather than relying on large mechanical moving parts. This substitution enables compact size, reduced activation force, and faster operation while maintaining the ability to physically separate contacts and interrupt current flow reliably
Solution Approach 2:
The patent divides the switching function into multiple micro-scale components within the MEMS structure. Instead of a single large mechanical switch, the system uses arrayed micro-electromechanical elements that can be controlled independently or collectively. This segmentation allows for compact integration while maintaining reliable current interruption through physical contact separation
2Speed
If solid-state switches are used for fast switching, then switching speed improves, but leakage current occurs and voltage drop increases causing power dissipation and heat generation
Solution Approach 1:
The patent employs a microelectromechanical switch that uses electrostatic actuation instead of solid-state electronic switching. This mechanical-electrostatic approach enables extremely fast switching speeds (microsecond range) while maintaining near-zero leakage current when contacts are separated and minimal resistance when contacts are closed, thereby reducing power dissipation and heat generation compared to solid-state alternatives
3Reliability
If contacts are physically separated to interrupt current, then current flow stops, but arc formation can occur allowing current to continue and causing damage
Solution Approach 1:
The patent incorporates a commutation circuit with a balanced diode bridge that converts the potentially harmful arc energy into beneficial effects. When contacts separate, the commutation circuit provides a controlled path for arc current, using the arc energy to drive the switching transition rather than allowing uncontrolled arc damage. The balanced diode bridge configuration specifically manages the arc energy to protect the switch contacts
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 enables fast, reliable, and energy-efficient switching with minimal arc formation and reduced risk of damage, addressing the limitations of conventional circuit breakers and solid-state switches by providing a compact, efficient, and safe switching mechanism.
Implementation Method 1
A commutation circuit can include a balanced diode bridge configured to suppress arc formation between contacts of the electromechanical switch structure
Implementation Method 2
The pulse circuit can include a pulse capacitor configured to form a pulse signal for causing flow of a pulse current through the balanced diode bridge
Implementation Method 3
an electrode configured to selectively receive a charge so as to establish a potential difference with the moveable element and thereby urge the moveable element over the characteristic time between a maximum contacting position
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An apparatus, such as a switch module (100), is provided. The apparatus can include an electromechanical switch structure (102) configured to move between an open configuration and a fully-closed configuration (associated with a minimum characteristic resistance) over a characteristic time. A commutation circuit (120) can be connected in parallel with the electromechanical switch structure, and can include a balanced diode bridge (122) configured to suppress arc formation between contacts of the electromechanical switch structure and a pulse circuit (142) including a pulse capacitor (146) configured to form a pulse signal (in connection with a switching event of the electromechanical switch structure) for causing flow of a pulse current through the balanced diode bridge. The electromechanical switch structure and the balanced diode bridge can be disposed such that a total inductance associated with the commutation circuit is less than or equal to a product of the characteristic time and the minimum characteristic resistance.