Analysis of Energy of High Voltage Arcing in the Cathode of Microwave Vacuum Tubes

Khazeinasab, Rashid | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46471 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): kaboli, Shahriyar
  7. Abstract:
  8. In recent years, semiconductor devices have incrementally taken the place of microwave tubes beneficially. However, microwave tubes are still indispensable in very high voltage usages (10 Kilowatts to 10 Megawatts) and high frequencies (Gigahertz and higher). Concerning that these tubes are of the most sensitive and expensive parts of such systems, protection measures are of high importance. One of the phenomena that cause failure or degradation of tubes is electric arc in cathode of the tubes and dissipating energy due to that. In order to prevent the tubes from undergoing such harm, protection must be put into consideration. Furthermore, the limit of this dissipating energy determines the capacitor needed at the output of the power supply of the cathode. Since the value of the capacitor is directly proportionate to the amount of ripple of the output voltage, an exact calculation of its value is of high importance. In this thesis, first electrical discharge in vacuum is fully analyzed and modeled. This model is used in a microwave vacuum tube. At last from this model and depending on amount of the power of the corresponding tube, a circuit is proposed for the protection of the tube, and then the value of the capacitor at the output of power supply is determined
  9. Keywords:
  10. Power Supply ; Microwave Tubes ; Electric Arc Discharge ; Vaccum Arc ; High Voltage DC Power Supply

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