LTD Pulse Generator Trigger Impedance for Adjustable Quadrangular Pulses
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Solution Overview
Problem
Existing high-power pulse generators of the Linear Transformer Driver (LTD) type produce quasi-sinusoidal pulses, which are not suitable for applications requiring quadrangular pulses, and adjusting the slope of these pulses is limited by spatial constraints and performance degradation due to modifications in inductance or conductor width.
Innovation Solution
A high-power pulse generator design featuring standard and modified modules with distinct trigger impedances, allowing adjustable pulse slope without altering the inductance or structure, by using different trigger resistances and parasitic capacitances to control the delay and phase shift of the pulses, thereby generating quadrangular pulses with adjustable rising and falling slopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the width of the conductors is increased to reduce inductance and adjust pulse slope, then the pulse shape improves, but the spatial requirements increase and isolation between conductors becomes difficult to maintain
Solution Approach 1:
The patent changes the electrical parameters (resistance and capacitance) of the trigger circuit rather than the physical dimensions of conductors. By adjusting the resistance value in the trigger circuit of modified modules, the pulse slope is controlled without modifying conductor widths or spatial layout, thus resolving the contradiction between pulse shape quality and spatial requirements
2Area of stationary object
If the width of the conductors is decreased to reduce spatial requirements, then the inductance increases and the maximum permissible power decreases
Solution Approach 1:
The patent uses electrical parameter adjustment (resistance and capacitance values in trigger circuits) instead of physical dimension changes. This allows slope control without decreasing conductor width, thereby maintaining both spatial efficiency and maximum permissible power output
3Shape
If the inductance is modified to adjust pulse slope, then the pulse shape improves, but the generator structure must be changed and performance may be adversely affected
Solution Approach 1:
The patent changes electrical parameters (resistance and capacitance) in the trigger circuit rather than modifying the inductance or generator structure. This simple parameter adjustment achieves pulse shape control without increasing device complexity or requiring structural modifications
Solution Approach 2:
The patent introduces a trigger circuit with adjustable resistance and capacitance as an intermediary element between the power modules and the output. This intermediary allows precise control of pulse slope without directly modifying the core generator structure or inductance values
4Shape
If standard modules and modified modules are combined to produce quadrangular pulses, then the pulse shape improves, but the trigger timing precision becomes critical
Solution Approach 1:
The patent uses resistance and capacitance values in the trigger circuit to precisely control the timing characteristics. By adjusting these electrical parameters, the trigger timing is optimized to ensure proper synchronization between standard and modified modules, achieving quadrangular pulse shape with controlled slope
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
Enables the production of high-power quadrangular pulses with adjustable slope, maintaining optimal performance and ease of adjustment without modifying the generator structure, using standard and modified modules with specific resistance and capacitance values to control the pulse shape.
Implementation Method 1
said second impedance being distinct from said first impedance, said slope of the pulse plateau depending on the difference between the value of said first impedance and that of said second impedance
Implementation Method 2
said trigger signal being applied through a trigger impedance connected to the trigger electrode of the switch
Implementation Method 3
a central core comprising a magnetic core that comprises at least one ferromagnetic ring, designed to add the pulses produced by the standard and modified modules
Implementation Method 4
a central core comprising a magnetic core that comprises at least one ferromagnetic ring
Data Source
AI summary
A high-power pulse generator (1), belonging to the LTD family, includes two series of power modules, one series of standard modules (3s) and one series of modified modules (3m), each including a switch (6s; 6m), provided with a trigger electrode (9s; 9m), positioned in series between two capacitors (4s; 4m), the modified modules being designed to produce a pulse at a frequency substantially three times the frequency of the standard modules, and a trigger device (13) designed to control the standard and modified switches (6s; 6m) via a single trigger signal applied to the trigger electrode (9s; 9m) of same. The trigger signal is applied to the switches through a trigger impedance (10m; 10s) that is different between the standard and modified modules, and the plateau slope of the generated pulse depends on the difference between the value of the standard impedance and that of the modified impedance.