Semiconductor Igniter Gas-Discharge Switch Timing Stability
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Solution Overview
Problem
Existing gas-discharge switches, such as pseudospark switches, face limitations in operating frequency, temperature range, and stability due to complex triggering circuits, high temporal instabilities, and limited dielectric strength, especially when handling high-energy switching and frequent operations.
Innovation Solution
A controllable gas-discharge device with a non-heated cathode and a polycrystalline semiconductor igniter, featuring a non-linear current-voltage characteristic, is designed with a specific geometry and materials to reduce trigger energy, improve timing stability, and enhance operational frequency and temperature range, utilizing a semiconductor igniter with a rough surface and a focusing screen to manage electrode material evaporation and plasma focusing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a dielectric igniter is used to provide high density of emitting charge and low delay time, then the initial switching performance is improved, but the service life is limited due to sputtering of electrode materials over the dielectric surface
Solution Approach 1:
The patent changes the material parameter of the igniter from dielectric to semiconductor material, which fundamentally alters the interaction with sputtered electrode materials. The semiconductor material's electrical and structural properties prevent the degradation mechanism that limits dielectric igniter life, while maintaining the high emitting charge density and low delay time performance.
Solution Approach 2:
The patent employs semiconductor material as a composite solution that combines the beneficial properties of high emitting charge density with resistance to electrode material sputtering. This composite material approach creates an igniter that is both高性能 for initial switching and durable for long-term operation.
2Reliability
If semiconductor material is used in the igniter unit for low operating frequency and high switching charge, then the stability is improved, but the triggering energy requirements increase
Solution Approach 1:
The patent optimizes the semiconductor material parameters including specific resistance (10^-3 to 10^3 ohm·cm) and geometric dimensions to achieve the right balance between stability and triggering energy. By carefully controlling these parameters, the igniter provides stable performance across a broad range of operating conditions while keeping triggering energy within acceptable limits.
3Reliability
If the contacting electrode width is large, then the mechanical strength and contact reliability are improved, but the timing uncertainty increases due to larger contact area with the igniter
Solution Approach 1:
The patent establishes an optimal parameter range for contacting electrode width (0.1 to 5 mm) that balances mechanical strength and timing precision. This parameter optimization ensures that the electrode is sufficiently strong and reliable while maintaining a contact area small enough to minimize timing uncertainty in the discharge triggering.
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 achieves low timing uncertainty, high current rise rates, and extended service life with reduced power losses and improved reliability across a wide range of operating conditions, including high temperatures and frequencies, by optimizing the igniter's material properties and geometry.
Implementation Method 1
utilizing a semiconductor igniter with a non-linear current-voltage characteristic
Implementation Method 2
at the initial stage of discharge development a discharge current passes through the bulk of the igniter
Implementation Method 3
featuring a non-linear current-voltage characteristic, is designed with a specific geometry and materials to reduce trigger energy, improve timing stability, and enhance operational frequency and temperature range, utilizing a semiconductor igniter with a rough surface
Implementation Method 4
utilizing a semiconductor igniter with a rough surface and a focusing screen to manage electrode material evaporation and plasma focusing
Implementation Method 5
controllable powerful gas-discharge devices, and more particularly to thyratrons with non-heated cathode or 'pseudospark switches', intended for fast switching in high-current high-voltage circuits
Data Source
AI summary
The invention relates to controllable powerful cold-cathode gas-discharge devices or pseudospark switches intended for rapidly switching high-current high-voltage circuits, which can be used in different pulse devices. The inventive cold-cathode gas-discharge device comprises an anode, a hollow cathode which is separated therefrom by a main discharge gap and whose base is oriented thereto, wherein said base is provided with openings embodied therein for coupling the main discharge gap to a trigger electrode which is arranged in the cathode cavity and is provided with an igniter made of a polycrystal semiconductor material based on a semiconductor whose energy gap is larger than 1.5 eV, the device comprises at least two contacting electrodes contacting with the igniter, wherein at least one electrode is connected to the trigger electrode, whereas the other is insulated therefrom and connected to the cathode, the maximum width of the contacting electrode in the cross-section thereof across a point where it is brought into contact with the igniter is equal to or less than 100 times the average pitch of roughness value on the igniter surface.