Flyback High-Voltage Pulse Generator for Fast Rise-Time Control
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Solution Overview
Problem
Existing high voltage pulse generators for neutron generating tubes face challenges in achieving fast rise times and efficient power transfer due to resonant waveforms and fixed pulse widths, leading to inefficiencies and increased power dissipation, especially when operating at elevated temperatures and in confined spaces.
Innovation Solution
The implementation of a flyback topology with a pulse generating transformer and high frequency transistors allows for efficient charging and discharging of capacitance with reduced power loss, enabling variable pulse widths and frequencies, and the use of multiple transformer circuits for enhanced efficiency and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If resonant waveform pulse generators are used, then voltage can be achieved, but rise time is slow and power dissipation increases
Solution Approach 1:
The patent employs periodic switching of transistors to charge and discharge capacitors in a controlled sequence, creating pulsed high voltage output with fast rise times. The periodic action of switching between charging and discharging phases eliminates the slow resonant waveform while maintaining voltage generation capability.
Solution Approach 2:
The patent changes the operational parameters from continuous resonant waveforms to discrete pulsed signals with controllable width and frequency. By adjusting pulse width and frequency parameters, the system achieves fast rise times and reduces power dissipation while maintaining the required high voltage output.
2Adaptability or versatility
If fixed pulse width generators are used, then simple design is achieved, but adaptability to different applications is limited
Solution Approach 1:
The patent implements dynamic control of pulse width through variable duty cycle switching of the transistor circuit. The pulse width can be adjusted by changing the timing of the switching signals, providing adaptability to different applications without requiring multiple fixed circuits.
Solution Approach 2:
The patent creates a universal pulse generator circuit that can produce various pulse widths and frequencies using the same basic topology. The circuit serves multiple functions including voltage generation, pulse shaping, and frequency control, eliminating the need for separate circuits for different applications.
3Loss of energy
If high frequency switching transistors are used, then efficiency is improved, but device complexity increases
Solution Approach 1:
The patent employs a self-oscillating circuit where the transistors automatically switch at high frequency based on the charging and discharging of capacitors. The circuit generates its own switching signals without external control, reducing the need for additional control circuitry while maintaining high efficiency through high-frequency operation.
Solution Approach 2:
The patent combines the voltage generation, switching control, and timing functions into a single integrated transistor circuit. The capacitors and transistors work together in a unified oscillating system, reducing overall device complexity while achieving high-frequency switching for improved efficiency.
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
This solution achieves high energy transmission efficiency, reducing power dissipation and enabling precise control of neutron pulses, even at elevated temperatures, thereby improving logging resolution and accuracy.
Implementation Method 1
a pulse generating transformer T1 having a primary coil (PC) with a first side and a second side, and a secondary coil (SC) with a first side and a second side
Data Source
AI summary
A high voltage pulse generator is disclosed. The high voltage pulse generator comprises a pulse generating transformer having a primary coil with a first side and a second side, and a secondary coil with a first side and a second side. A direct current (DC) voltage source connection is at the first side of the primary coil. A first high frequency power driver transistor is coupled between the second side of the primary coil and a ground connection. The first high frequency power driver transistor is configured to operate in an on-mode for a selected time period to charge the primary coil for the selected time period based on a switching frequency of the first high frequency power driver transistor, and switch the first high frequency power driver transistor to an off-mode at the switching frequency to release the charge from the primary coil to the secondary coil. A diode is coupled between the first side of the secondary coil and a pulsed voltage output that is configured to be connected to a high voltage device. The diode configured to direct a flow of charge from the secondary coil to charge a capacitance of the high voltage device to a rising pulse leading edge of a voltage pulse.