Development Of A Power Module For Space Qualified Klystron Transmitter

Abstract

This project aims for the design, simulation, fabrication & testing of a compact DC-DC converter. This DC-DC converter may be a resonant converter or it can be a simple full bridge type. This high voltage DC-DC converter is used for Missile application so weight and the area of this converter should be optimum. High voltage DC-DC converter is usually used in different types of electronic equipments. Typical examples are telecommunication equipments with vacuum tubes (TWT), industrial application and space applications. The heart of this converter is a high frequency transformer, which plays a vital role for designing of DC-DC converter. The design of high-voltage DC-DC converters is challenging because the large turn ratio of the transformer exacerbates the transformer non-idealities. In particular the leakage inductance and the winding capacitance can significantly change converter behavior. So, all the parasitic components are taken into account while selecting the converter topology. To fulfill the requirement of the project specification there are many converter topologies. But the prime importance is to select the best topology in the sense of robustness and optimum size. In the given time period of 10 months, simulation, fabrication and testing of DC-DC full bridge converter for space qualified Klystron Tube is done. Transformer is designed for the given specifications. Transformer on ‘C’ core fabricated. Results with ‘C’ core transformer matched with the required specifications. Primary and secondary waveforms for this transformer are analyzed with full bridge type DC-DC converter. Open loop and close loop operation of full bridge converter are tested successfully. Over all system stability is analyzed for the required limits.