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Analysis of Marx Pulsed Power Generator for Improving the Output Voltage Waveform Characteristics

Naghibi Nasab, Javad | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50058 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Kaboli, Shahriyar
  7. Abstract:
  8. In this thesis, marx pulsed power generators are investigated. Due to very large magnitude of its output voltage and very fast rise time, Marx generator is the first choice in lots of pulsed power applications. A significant barrier in the implementation of this generators are the switches with witch the structure is made. The short magnitude nominal voltage and current of the solid state switches lead to use of Spark Gaps in which the determinative parameter of the switch to turn on, is its breakdown voltage. These switches have some limitations in repetition rate and turn off ability. However due to very high range of nominal voltage and currents, they are an appropriate choice for marx generator structures.The most serious problem in spark gap based generators is the lack of turn- off ability of the circuit. It means when the switches reach to their breakdown voltage and start to conduct, due to undying characteristic of electrical arc, there is no control on them to be turned off. To fix this problem, setting the circuit on critically damped mode have been used. But this method has some disadvantages like slowing down the rise- time and decreasing the peak voltage.Here, we have done some investigations and experiments to characterize the spark- gap switch circuit parameters and the impact of these parameters on marx circuits. Then by the aid of a magnetic switch, we have proposed a structure in which the fall time and FWHM of the output waveform of marx generator have been improved noticeably. By using the developed magnetic switch, we can use the circuit in under damped mode. Because in this mode, the best rise time and peak voltage is achieved
  9. Keywords:
  10. Spark Gap ; High Voltage Pulse Generator ; Magnetic Switch ; Marx Pulsed Generator

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