Transmission Line Pulse Compression With Smaller Magnetic Switches
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Solution Overview
Problem
Existing high voltage electrical pulse generation technologies face inefficiencies due to large magnetic switch volumes, leading to excessive energy loss and imperfect pulse shapes, particularly in applications like gas lasers and particle accelerators, where precise rectangular pulses are required.
Innovation Solution
A pulse compressor circuit with two transmission lines and a saturable magnetic switch that halves the pulse duration while maintaining voltage, reducing the magnetic switch's cross-sectional area and improving pulse shape by connecting the switch at the optimal time to superimpose pulses, thereby reducing volume and energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic switch is used to generate rectangular voltage pulses, then the pulse generation reliability is improved, but the magnetic switch volume becomes very considerable
Solution Approach 1:
The magnetic switch is divided into two separate magnetic cores (first and second magnetic cores) that operate independently. Each core handles a portion of the pulse generation task, allowing the overall system to achieve the required reliability while each individual core can be more compact than a single large switch would be.
Solution Approach 2:
The patent employs a nested structure where the first and second magnetic cores are positioned in proximity to each other, with their respective windings interconnected. This nesting arrangement allows shared magnetic flux paths and reduces the total volume required compared to two separate switches.
2Device complexity
If the magnetic switch volume is reduced, then the cost and device complexity are improved, but the rise and fall characteristics of the rectangular pulse are degraded
Solution Approach 1:
By segmenting the pulse generation function across two magnetic cores with different inductance values, the system can independently optimize each core's parameters. The first core with higher inductance handles the rising edge, while the second core with lower inductance handles the falling edge, maintaining precise pulse shape control despite reduced individual core volumes.
Solution Approach 2:
The patent changes the inductance parameter between the two magnetic cores (first core has higher inductance, second core has lower inductance). This parameter differentiation allows each core to be optimized for specific portions of the pulse waveform, enabling compact design while preserving rise and fall characteristics.
3Volume of stationary object
If solid state switches are used instead of magnetic switches, then the volume is reduced, but the pulse shape degradation increases due to limited magnetic flux swing
Solution Approach 1:
The patent optimizes the magnetic flux swing parameter by using two magnetic cores with different inductances rather than a single core. This allows the system to achieve adequate flux swing for good pulse shape while keeping each individual core compact, avoiding the volume penalties of traditional single-core designs.
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 solution significantly reduces the volume of magnetic switches, enhances pulse shape quality, and minimizes energy loss by halving the pulse duration while maintaining voltage, resulting in a more efficient and compact pulse generation system.
Implementation Method 1
solid state switches include active semiconductor devices such as thyristors, IGBTs and the like, often in combination with passive magnetic switches in which saturation of a magnetic core gives a sudden drop in circuit inductance and impedance
Implementation Method 2
a compressor circuit comprises two transmission lines AB and BC each of round trip transit time τ/2 and impedance Z connected to each other at point B
Data Source
AI summary
A rectangular electrical pulse enters a transmission line structure with single pass transit time equal to ½ the duration of the pulse, open circuit at the extreme end and a switch at its center. After a delay equal to ¾ of the rectangular pulse duration the central switch is closed to couple the contents of the transmission line structure into another transmission line of half impedance. The output pulse maintains the initial voltage, but is of half the initial duration, and double the initial power.