Electron Gun Driver Half-Bridge Switching for Fast Pulse Modulation
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Solution Overview
Problem
Conventional electron gun drivers in linear accelerators lack the capability to modulate pulse amplitude, width, and delay at high switching speeds, particularly on a millisecond or sub-millisecond scale, which is essential for accurate control of x-ray pulses in material discrimination applications.
Innovation Solution
A triode gun driver design with a high voltage side and low voltage side, utilizing high voltage power amplifiers and a half-bridge circuit to rapidly switch grid drive and cutoff voltages, enabling pulse-by-pulse adjustments of amplitude, width, and delay at rates up to 500 pulses per second.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electron gun drivers are used with fixed voltage levels and timing, then the system structure is simple, but the pulse parameter control precision is insufficient for material discrimination applications
Solution Approach 1:
The patent implements dynamic control of pulse parameters by replacing fixed voltage levels with programmable voltage amplifiers that can adjust amplitude, width, and delay on a pulse-by-pulse basis. The driver circuit transitions from static factory-defined modes to dynamic programmable control, enabling precise adjustment of grid drive voltage characteristics for each pulse to achieve material discrimination capabilities.
Solution Approach 2:
The patent changes multiple parameters simultaneously including voltage amplitude, pulse width, and timing delay through programmable control. The voltage amplifiers are configured with programmable gain and timing characteristics, allowing independent adjustment of each pulse parameter to optimize x-ray generation for specific material discrimination applications.
2Speed
If factory-defined modes with two or more voltage levels are used, then the adaptability increases, but the switching speed between modes is limited and cannot achieve millisecond or sub-millisecond modulation
Solution Approach 1:
The patent replaces discrete mode switching with continuous dynamic control using programmable voltage amplifiers. Instead of switching between predetermined factory-defined modes, the system can dynamically adjust voltage amplitude, pulse width, and delay for each individual pulse, achieving both high switching speed and full parameter flexibility.
Solution Approach 2:
The programmable voltage amplifiers serve multiple functions simultaneously: they provide voltage amplification, pulse width control, timing delay adjustment, and amplitude modulation. This multi-functionality eliminates the need for separate circuits for each control parameter, enabling rapid switching while maintaining full adaptability.
3Ease of operation
If alternating between two factory-defined modes is used, then the system can provide different energy levels, but the timing for each mode is fixed and cannot be independently adjusted
Solution Approach 1:
The patent merges multiple control functions into a single programmable voltage amplifier circuit. The amplifier integrates voltage gain control, pulse width modulation, and timing delay functions that were previously distributed across separate fixed-mode circuits. This consolidation simplifies the overall control architecture while providing enhanced programmability.
Solution Approach 2:
The patent enables independent programmable adjustment of multiple parameters including voltage amplitude, pulse width, and timing delay through digital programming of the voltage amplifiers. Each parameter can be independently configured without affecting others, providing ease of operation while the integrated circuit design manages the inherent complexity.
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 allows for precise control of x-ray pulses, enhancing the versatility and functionality of linear accelerators for material discrimination by enabling rapid and flexible adjustment of pulse parameters, overcoming the limitations of conventional systems.
Implementation Method 1
The particle beam is directed through an accelerator structure. The accelerated particle beam is generated by pulsing the particle source to generate a pulse of particles directed at the accelerator structure.
Implementation Method 2
The accelerator structure is a resonant structure that uses an input RF signal to accelerate the particles in the particle beam. The RF signal accelerates the particles to generate the accelerated particle beam.
Data Source
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AI summary
Technology is described for an electron gun driver including a half bridge driver circuit and a drive controller. The half bridge driver circuit includes a drive circuit configured to generate a grid drive voltage for a grid connection of an electron gun, and a cutoff circuit configured to generate a grid cutoff voltage for the grid connection of the electron gun, and a gate driver configured to switch between the grid drive voltage and the grid cutoff voltage. The drive controller is configured to generate a pulse input to the drive circuit and cutoff circuit and grid switching signals for the gate driver.