Analysis and Improvement of Output Voltage Ripple in High Voltage DC Power Supply

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Ziaoddini, Mojtaba | 2019

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 52389 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Kaboli, Shahryar
Abstract:
The TWT is highly sensitive to the ripple amplitude of its power supply output voltage. If the amplitude of the output voltage's ripple exceeds a certain limit, the amplitude of the undesired harmonics in the power spectrum of the TWT is greatly increased. Increasing the amplitude of undesired harmonics in the TWT output power spectrum reduces the accuracy and performance of the TWT. Therefore, for optimum TWT performance, a low-ripple power supply is essential. Typically, a low-frequency rectifier or high-frequency switching structure is used to build a high-voltage DC power supply. In this thesis, the different structures of high voltage DC power supplies are studied. Next, by focusing on high-voltage DC sources with a low-frequency rectifier structure, the reasons for appearing ripple on output voltage in the power supply are investigated. After performing simulation and implementation of practical tests, the reason for appearing ripple on output voltage is identified at the power supply. Finally, a practical solution is provided to reduce the amplitude of the ripple seen at the output voltage
Keywords:
Traveling Wave Tube (TWT) ; Power Supply ; Ripple ; Measurement ; High Voltage Power Supply ; High Voltage DC Power Supply

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