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Design of Low Frequency Transformer of Vacuum Tube Power Supply for Minimizing the Output Voltage Ripple Considering the Insulation System Lifetime

Ziaoddini, Mojtaba | 2025

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 58444 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Kaboli, Shahriyar
  7. Abstract:
  8. The Traveling Wave Tube (TWT) is highly sensitive to the ripple voltage present in its power supply output. When the ripple amplitude exceeds a certain threshold, the level of undesirable harmonics in the TWT output spectrum increases significantly. This rise in harmonic content degrades the linearity, accuracy, and overall performance of the TWT. Therefore, achieving a high-voltage DC power supply with minimal output ripple is essential for stable and efficient TWT operation. Typically, high-voltage DC power supplies are realized using two main approaches: low-frequency rectification-based systems and high-frequency switching converters. In this research, attention is focused on low-frequency rectification-based high-voltage DC power supplies, and the mechanisms contributing to output voltage ripple are systematically investigated. To analyze this phenomenon in detail, both simulation studies and experimental tests were carried out using laboratory prototypes. The results reveal that one of the primary sources of output ripple is the stray capacitance associated with the step-up transformer of the collector supply. Due to asymmetry in the secondary winding, these parasitic capacitances lead to uneven charge distribution and consequently induce voltage ripple at the output. Finally, structural modifications and a practical design solution are proposed to mitigate this effect. The implemented approach successfully reduces the ripple amplitude and enhances the overall stability and performance of the TWT power supply system
  9. Keywords:
  10. Traveling Wave Tube (TWT) ; High Voltage DC Power Supply ; Voltage Ripple ; Stray Capacitance ; Step Up Transformer ; Low-Frequency Rectification

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