Laser-Triggered Photoconductive Switches for High-Current Pulse Splitting
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Solution Overview
Problem
Current pulse power technologies face limitations in controlling high current pulses due to the physical properties of silicon-based semiconductor materials, requiring numerous components and resulting in large size, high power loss, and reduced stability.
Innovation Solution
A controllable splitting method for high current pulses using a photoconductive switch, specifically a planar silicon carbide switch, is implemented by electrically connecting it between input and output ends and triggering it with a laser pulse, allowing for precise control of the waveform and splitting of current pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional silicon-based semiconductor components are used to control high current pulses, then the control capability is limited by the physical properties of silicon material, but the number of components required increases, resulting in large volume and high power loss
Solution Approach 1:
The patent changes the material parameter from conventional silicon-based semiconductor to wide bandgap semiconductor (such as silicon carbide), which fundamentally alters the physical properties including critical breakdown field strength and thermal conductivity. This parameter change enables single components to withstand tens to hundreds of kilovolts and kiloamperes, dramatically reducing the number of components needed while maintaining or improving reliability.
Solution Approach 2:
The patent employs wide bandgap semiconductor materials (silicon carbide, gallium nitride, diamond) as composite material solutions that combine multiple desirable properties: high critical breakdown field strength, high thermal conductivity, and high electron saturation drift velocity. These composite material characteristics enable the switch to handle extreme voltage and current conditions with fewer components.
2Reliability
If conventional silicon-based semiconductor components are used to control high current pulses, then the control capability is limited, but the volume of the system increases due to requiring a large number of components
Solution Approach 1:
By changing the material parameter from silicon to wide bandgap semiconductor, the patent achieves higher control capability in terms of voltage and current handling per component. This parameter change directly reduces the number of components required, thereby shrinking the overall system volume while improving control capability for high power applications.
Solution Approach 2:
The patent transitions from electrical control methods to optical control methods by using laser-triggered photoconductive switches. This dimensional change from electrical domain to optical domain enables precise timing control and eliminates the need for complex electrical interconnections between multiple components, significantly reducing system volume.
3Reliability
If conventional silicon-based semiconductor components are used to control high current pulses, then the control capability is limited by material properties, but power loss increases due to the large number of components required
Solution Approach 1:
The patent changes the material parameter to wide bandgap semiconductor with superior electrical properties including higher breakdown field strength and better thermal conductivity. This parameter change enables each component to handle higher power levels with lower losses, and the reduction in component count further minimizes cumulative power loss across the system.
Solution Approach 2:
The patent replaces electrical control mechanisms with optical control mechanisms using laser-triggered photoconductive switches. This substitution eliminates resistive losses and switching losses associated with electrical control circuits, significantly reducing power loss while maintaining the ability to withstand high voltage and high current.
4Reliability
If conventional silicon-based semiconductor components are used to control high current pulses, then the control capability is limited, but the system requires numerous components resulting in reduced stability
Solution Approach 1:
By changing the material parameter to wide bandgap semiconductor, the patent achieves higher control capability with fewer components. The reduction in component count directly improves system stability by eliminating multiple potential failure points, while the superior material properties provide more stable operation under extreme electrical conditions.
Solution Approach 2:
The patent replaces electrical control systems with optical control systems using laser-triggered switches. This substitution improves stability by eliminating electrical interference, ground loops, and synchronization issues inherent in electrical control, while providing precise and repeatable switching characteristics.
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 method enables compact, efficient, and stable control of high current pulses, reducing the number of components needed and minimizing power loss, while allowing for adjustable output current values and waveform regulation.
Implementation Method 1
Irradiating a laser pulse emitted by the pulse laser to the photoconductive switch; When a current pulse is input at the input end, a time-domain signal triggering the pulse laser so that the pulse laser synchronously outputs a laser pulse, the laser pulse irradiating the photoconductive switch so that the photoconductive switch is in an on state
Data Source
AI summary
A controllable splitting method comprises: electrically connecting a photoconductive switch between input and output ends of a current pulse; connecting a time domain signal of the input current pulse to an external triggering port of a pulse laser; emitting a laser pulse to irradiate the switch; when no current pulse is input, failing to receive an external triggering signal and not outputting the laser pulse, the switch being in an off state without the irradiation of the laser pulse, and no current being output; when the current pulse is input, triggering the pulse laser to synchronously output the laser pulse on a time domain, irradiating the switch so that the switch is in an on state and the current pulse is output; and forming, at the output end, a current pulse signal synchronous with a time domain of the input end and having a split waveform.