Pulsed-Power Triggering Circuit With Midplane Isolation
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Solution Overview
Problem
Conventional pulsed-power drivers face challenges in generating high-current pulses with short rise times, leading to energy loss and structural damage, and IMG-based drivers have issues with component count, cost, weight, and complex implementation, requiring improved efficiency and synchronization of pulse-forming bricks.
Innovation Solution
A modular IMG-based pulsed-power driver with a voltage adder assembly and transmission line, featuring segmented conductors and external triggering, along with a triggering system to synchronize and isolate pulse-forming circuits, and independent pressurization of switches to enhance efficiency and reduce misfiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional Marx-based generators are used to achieve high-voltage pulses, then voltage is improved, but energy loss increases and thermal loads cause structural damage
Solution Approach 1:
The Marx generator is divided into multiple stages, each generating a pulse that is compressed by dedicated pulse-forming lines. This segmentation allows distributed energy management and reduces the energy loss concentration in any single component, while achieving the desired high-voltage output through constructive addition of staged pulses.
2Productivity
If pulse compression circuits are added to achieve high currents with short rise times, then current and rise time are improved, but energy loss increases and thermal loads increase
Solution Approach 1:
Pulse-forming lines act as intermediary elements between the Marx generator stages and the load. These transmission lines with specific impedance matching enable efficient energy transfer and pulse compression without requiring additional active compression circuits, thereby reducing energy loss and thermal generation while achieving the required current and rise time specifications.
3Weight of stationary object
If IMG-based drivers are used to reduce cost and weight, then cost and weight are improved, but component count and implementation complexity remain high
Solution Approach 1:
The triggering system integrates multiple functions into unified control circuits that simultaneously manage synchronization, timing, and coordination of pulse-forming bricks across all stages. This merging of control functions reduces the number of separate control components and simplifies the overall implementation while maintaining the modular IMG-based architecture's weight and cost advantages.
4Speed
If multiple pulse-forming bricks are stacked in series and parallel to achieve short rise times, then rise time is improved, but component count increases and misfiring likelihood increases
Solution Approach 1:
The triggering system incorporates feedback mechanisms that monitor the state of each pulse-forming brick and adjust triggering signals accordingly. This feedback ensures synchronized operation of all bricks, prevents misfiring conditions, and maintains reliable operation even as the number of bricks increases to achieve shorter rise times.
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 modular design and triggering system improve assembly, maintenance, and operational efficiency by reducing misfiring and energy loss, while allowing flexible pulse generation and control, enhancing the driver's performance and reliability.
Implementation Method 1
The triggering system is configured to distribute a trigger pulse to a plurality of pulse-forming circuits
Implementation Method 2
Each pulse-forming circuit can be provided as an RLC driver circuit including a pair of capacitors and a switch electrically connected in series
Implementation Method 3
The transmission line is impedance-matched to the voltage adder assembly
Implementation Method 4
Both the inner conductor and the outer conductor can have a modular segmented configuration along the driver axis
Data Source
AI summary
An integrated triggering system for a pulsed-power driver is presented. The triggering system includes a pulse distribution circuit that couples externally generated trigger pulses to midplanes of a limited number of stages of the pulsed-power driver. The pulse distribution circuit includes common midplane nodes, each coupled to a group of midplanes of a same stage via respective isolating inductors. Isolating elements are coupled between the common midplane nodes of a same stage. The triggering system further includes a protection circuit configured to reduce coupling of high voltages triggered at the midplanes to external circuits while allowing the trigger pulses to couple to the midplanes. The protection circuit includes a high pass filter comprising a capacitor. The triggering system further includes a midplane biasing circuit configured to provide a reference ground to the midplanes of all stages. The midplane biasing circuit includes a resistive ladder with nodes coupled to the midplanes.