Compact Marx Pulse Generator With Parallel Switching for Low-Impedance Loads
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Solution Overview
Problem
Marx generators face inefficiencies in voltage multiplication due to high characteristic impedance, making them unsuitable for compact applications with low impedance loads, and struggle with high repetition rates due to slow switch closure and spark gap recovery issues.
Innovation Solution
A compact Marx generator design with a conductive metallic housing, parallel switching topology, and regulated compressed air for spark gap purging, utilizing inductive charging and a command-charge power supply to minimize impedance and enhance repetition rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional Marx generator design is used, then voltage multiplication is achieved, but characteristic impedance is high making it unsuitable for low impedance loads
Solution Approach 1:
The Marx generator is divided into multiple independent stages, each with its own capacitor and switch. This segmentation allows each stage to contribute to voltage multiplication while the overall configuration can be optimized for low impedance. The distributed structure reduces the characteristic impedance by spreading the inductance across multiple stages rather than having a single high-inductance path.
Solution Approach 2:
The patent transitions from a traditional series-only configuration to a three-dimensional modular architecture where stages are arranged in a compact geometric pattern. This spatial arrangement reduces the loop area and parasitic inductance, thereby lowering characteristic impedance while maintaining voltage multiplication capability.
2Volume of moving object
If compact geometry is used, then volume is reduced, but characteristic impedance increases causing voltage inefficiencies
Solution Approach 1:
The patent employs a nested modular design where capacitor assemblies, switch assemblies, and charging components are tightly integrated within each stage module. This nesting allows compact packaging that reduces overall volume while maintaining the electrical geometry necessary for low characteristic impedance. The modules can be stacked or arranged in compact configurations without sacrificing performance.
Solution Approach 2:
The patent optimizes geometric parameters such as trace width, spacing, and layer thickness in the PCB construction to achieve low characteristic impedance in a compact form. By carefully controlling these dimensional parameters, the design achieves both compactness and voltage efficiency simultaneously.
3Productivity
If high repetition rates are required, then spark gap recovery time must be reduced, but this requires sophisticated purging mechanisms
Solution Approach 1:
The patent uses a pneumatic purging system where compressed gas flows through channels in the PCB to rapidly clear ionized gas from the spark gap region. This pneumatic approach enables high repetition rates by quickly restoring the insulating properties of the gap between pulses, avoiding the need for complex mechanical moving parts while achieving the required recovery speed.
Solution Approach 2:
The patent replaces traditional mechanical purging mechanisms (such as moving parts or complex valve systems) with an integrated pneumatic channel system built into the PCB structure. This substitution simplifies the overall device complexity while maintaining the ability to achieve high repetition rates through effective gas flow management.
4Speed
If inductive charging is used, then charging speed is improved, but circuit complexity increases
Solution Approach 1:
The patent combines the charging inductors with the PCB structure itself, integrating the magnetic circuit into the board layout. This merging of functions allows inductive charging to occur through the PCB traces and ground planes, eliminating the need for separate discrete inductor components and reducing overall circuit complexity while maintaining fast charging 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 design achieves low characteristic impedance, enabling direct sourcing of low impedance loads and high repetition rates, resulting in higher average powers and improved voltage efficiency.
Implementation Method 1
Each Marx generator stage typically incorporates a switch designed to close at a predetermined voltage. At closure, the capacitor stages add, or, in the commonly understood industry terminology, 'erect,' to form an overall capacitance
Implementation Method 2
an air handler that channels a compressible gas medium from a central location to each spark gap switch to purge the ionized gas from the spark gaps between closures
Data Source
AI summary
A compact Marx-type generator capable of producing high voltage pulses into low impedance loads. A parallel switch and distributed capacitance topology produce a coaxial-like conduction through the Marx-like circuit, resulting in a low source impedance. The parallel switching topology also lends itself to high repetition rates. Without loss of generality the device may be used, for example, as a source for vacuum diode loads, such as in flash radiography and high power microwaves.