This paper mentions the design and construction of high voltage generator 30 kV using a Fly-back converter. The designed circuit includes the high frequency switching generator which applies power to the primary input voltage of Fly-back transformer. The input power is transformed to be high voltage on the secondary side of Fly-back transformer. The half wave rectifier is constructed for the high voltage direct current (HVDC). Resistive voltage divider is designed and constructed to measure HVDC as well. Moreover, the characteristics of output voltage waveform of the proposed generator is compared with the waveform of the HVDC from Cockroft – Walton circuit.The.comparison.results.show.good.agreement.with.small.difference.

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