High-Voltage Actuator Switch with Field Plates for Breakdown Control
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Solution Overview
Problem
Existing high-voltage switching devices for microelectromechanical systems (MEMS) face challenges in scaling voltage beyond 800 V due to uneven voltage distribution, which can lead to runaway breakdown processes and reduced on-current, making it difficult to achieve a reliable wide-range voltage operation.
Innovation Solution
A high-voltage switching device is designed with a first transistor acting as an inverter and a second transistor as an output or driver, featuring a plurality of electrodes and field plates that distribute voltage uniformly across an ungated channel, allowing for cascaded stages to extend the voltage range and prevent localized voltage concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If high voltage (several kV) is used for electrostatic actuation, then sufficient output force is achieved, but generating and controlling such high voltage in micro-electronics becomes challenging
Solution Approach 1:
The patent divides the high-voltage channel into multiple segments by introducing intermediate electrodes (field plates) that are connected to intermediate voltage taps. This segmentation allows the total high voltage to be distributed across multiple lower-voltage sections, making generation and control more manageable while still achieving the required output force.
Solution Approach 2:
The patent extends the voltage distribution along the spatial dimension by placing multiple field plates at different positions between source and drain. This dimensional approach allows voltage to be distributed progressively along the channel length, transforming a single-point high-voltage problem into a distributed multi-point control system.
2Adaptability or versatility
If voltage is increased beyond 800 V, then wider voltage range operation is achieved, but uneven voltage distribution causes runaway breakdown processes
Solution Approach 1:
The patent creates equipotential regions by introducing field plates connected to intermediate voltage taps. These field plates establish uniform voltage distribution across each segment of the channel, preventing localized voltage concentration and the resulting runaway breakdown processes that occur in unsegmented high-voltage channels.
Solution Approach 2:
The patent applies different voltage potentials to different regions of the channel through the field plate structure. Each segment between field plates has its own optimized voltage distribution, allowing the device to operate reliably across a wide voltage range by locally managing electric field strength in each region.
3Power
If voltage is increased beyond 800 V, then higher output capability is achieved, but on-current decreases
Solution Approach 1:
The patent introduces dynamically controllable field plates with intermediate voltage taps that can be independently controlled. This dynamic control allows optimization of the voltage distribution profile to maintain adequate on-current while achieving high output capability, as the intermediate taps can be adjusted to prevent current saturation effects.
Solution Approach 2:
The field plates connected to intermediate voltage taps act as intermediaries between the source and drain. These intermediary elements provide additional current paths and voltage reference points that help maintain on-current levels while enabling the device to operate at higher overall voltage levels for increased output capability.
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 increases the operational voltage range up to 1200 V with improved on/off ratios, preventing breakdown and maintaining current efficiency, while the cascaded stages enable scalable high-voltage operation without compromising on-current.
Implementation Method 1
a first transistor configured to serve as an inverter. The first transistor includes a first source, a first gate, a first drain
Implementation Method 2
a plurality of field plates that are spaced apart from one another across an ungated channel of the second transistor. The field plates are configured to distribute high-voltage substantially uniformly across the ungated channel
Implementation Method 3
MEMS typically use electrostatic actuation, piezo actuation, or thermal actuation. Electrostatic actuation scales down to smaller sizes better than electromagnetic actuation and thermal actuation
Data Source
AI summary
A device includes a first transistor having a first source, a first gate, a first drain, and one or more electrodes. The first transistor serves as an inverter. The device also includes a second transistor having a second source, a second gate, and a second drain. The first and second sources are connected together. The first and second drains are connected together. The second transistor serves as an output, a driver, or both. The one or more electrodes, the second gate, or a combination thereof serve as tapped drains that are configured to sample a stepped voltage of the second transistor.