MEMS Arc-Less Switching with Energy Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional circuit breakers are large, slow, complex, and expensive, and they often form arcs during switching, which can damage contacts and pose safety hazards due to leakage currents and voltage drops in solid-state switches, making them unsuitable for high-speed applications.
Innovation Solution
A micro-electromechanical system (MEMS) based switching system with integrated arc suppression circuitry, including a balanced diode bridge and pulse circuit, that rapidly switches MEMS switches from a closed to an open state at near-zero voltage, preventing arc formation by creating a physical gap and minimizing voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electromechanical switches are used in circuit breakers, then the switching mechanism is simple and reliable, but the device size is large, activation force is high, and switching speed is slow
Solution Approach 1:
The patent replaces conventional electromechanical switching mechanisms with solid-state switches that have no moving parts. The solid-state switches use electronic field effects to control current flow, eliminating mechanical inertia and contact wear. This substitution achieves nanosecond-scale switching speeds while maintaining reliability through solid-state physics rather than mechanical action.
Solution Approach 2:
The patent changes the fundamental operating parameters of the switching mechanism by transitioning from mechanical contact-based switching to field-effect-based switching. This involves changing the control mechanism from physical force and contact separation to electric field modulation, enabling ultrafast switching responses in the nanosecond range while maintaining system reliability.
2Device complexity
If conventional electromechanical switches are used in circuit breakers, then the device structure is simple, but the device size is large and fabrication cost is high
Solution Approach 1:
The patent replaces bulky electromechanical components with compact solid-state switches that can be fabricated using standard semiconductor manufacturing processes. This substitution dramatically reduces device size and simplifies the switching mechanism structure, enabling cost-effective mass production through established semiconductor fabrication techniques rather than complex mechanical assembly.
Solution Approach 2:
The patent employs solid-state switch designs that can be replicated using standard semiconductor fabrication processes. The switching elements are created through photolithography and thin-film deposition techniques that allow for high-volume, low-cost production. This copying approach enables identical switching circuits to be manufactured repeatedly with consistent performance and low unit cost.
3Speed
If solid-state switches are used to achieve fast switching, then switching speed is improved, but leakage current and voltage drop generate excess heat
Solution Approach 1:
The patent introduces a charge pump circuit as an intermediary mechanism that actively manages the electrical characteristics of the solid-state switches. The charge pump dynamically adjusts the gate voltage and compensates for threshold voltage shifts, optimizing the on-state conductivity of the switches. This intermediary control mechanism minimizes voltage drop across the switches during conduction, thereby reducing I²R heat generation while maintaining nanosecond switching speeds.
Solution Approach 2:
The patent dynamically changes the operating parameters of the solid-state switches through active voltage control. By using charge pump circuits to adjust gate voltages in real-time, the system optimizes the conductivity parameter of the switches during operation. This parameter optimization reduces on-resistance and minimizes power dissipation, controlling heat generation despite the high switching speeds achieved.
4Speed
If solid-state switches are used for high-speed switching, then switching performance is improved, but leakage current prevents use in circuit breaker applications
Solution Approach 1:
The patent employs charge pump circuits as intermediary control elements that actively manage the switching behavior of the solid-state devices. These charge pumps dynamically adjust the gate voltages to ensure complete turn-off of the switches, driving the leakage current to negligible levels. This intermediary control mechanism enables the solid-state switches to achieve both nanosecond switching speeds and the ultra-low leakage currents required for reliable circuit breaker operation.
Solution Approach 2:
The patent dynamically changes the electrical parameters of the solid-state switches through active voltage control during the switching process. By using charge pump circuits to apply optimized gate voltages, the system transitions the switches from a high-conductivity on-state to a high-impedance off-state with minimal leakage. This parameter optimization enables the switches to meet both the speed requirements for high-performance operation and the leakage requirements for circuit breaker reliability.
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 MEMS-based switching system achieves fast, arc-less switching with reduced heat generation and increased safety, enabling efficient and reliable circuit protection without the drawbacks of conventional circuit breakers.
Implementation Method 1
micro-electromechanical system (MEMS) based switching system
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A system is presented that includes a micro-electromechanical system switch (20). Further, the system includes a balanced diode bridge (28) configured to suppress arc formation between contacts of the micro-electromechanical system switch. A pulse circuit (52) is coupled to the balanced diode bridge to form a pulse signal in response to a fault condition. An energy-absorbing circuitry (200) is coupled in a parallel circuit with the pulse circuit and is adapted to absorb electrical energy resulting from the fault condition without affecting a pulse signal formation by the pulse circuit.