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Area of Science:

  • Electrical Engineering
  • Electromagnetism
  • Solid-State Physics

Background:

  • Generating high magnetic fields with variable pulse widths is crucial for various applications.
  • High-current switching in inductive loads, like coils, generates surge voltages that can damage switching devices.
  • Existing methods for variable pulse width generation face challenges with inductive energy dissipation.

Purpose of the Study:

  • To propose and analyze an electric circuit for generating high magnetic fields with controllable pulse widths.
  • To mitigate surge voltage issues during high-current switching in inductive loads.
  • To demonstrate the implementation of a pulsed magnetic field with variable pulse width.

Main Methods:

  • Designed an electric circuit employing insulated gate bipolar transistor (IGBT) switching.
  • Incorporated an external parallel circuit to absorb and dissipate inductive energy.
  • Performed circuit analysis for analytical solutions and utilized circuit simulations to validate results.
  • Investigated transient response waveforms of surge voltage and current.

Main Results:

  • Analytical and simulation results for surge voltage and current waveforms showed good agreement.
  • Identified a trade-off between surge voltage and current decay time constant based on external circuit parameters (resistance and capacitance).
  • Successfully demonstrated interruption of discharge current (500 A peak, 1 ms FWHM, 3 kV surge) at arbitrary timing using anti-series IGBTs.

Conclusions:

  • The proposed circuit effectively generates high magnetic fields with variable pulse widths.
  • The parallel external circuit successfully manages inductive energy and surge voltage, protecting switching devices.
  • The developed system enables precise control over pulsed magnetic field generation for diverse applications.