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In this paper an optimum design is proposed for the buck converter pulse width modulator controller, which formulates the value of PID parameters using Linear Quadratic Regulator (LQR) approach. The uniqueness of this approach is that it gives the values of PID parameters with minimum cost function. Simulation and experimental results show the effectiveness of the method. Load disturbance and line voltage disturbance show the robustness of the proposed techniques.

A: This paper described the detailed design, development and testing of high voltage power supply (−30 kV, 3.2 A) and different power supplies for biasing electrodes of Inductive Output Tube (IOT) based high power Radio Frequency (RF) amplifier. This IOT based RF amplifier is further used for pursuing research and development activity in superconducting RF cavity project at Variable Energy Cyclotron Centre (VECC) Kolkata. The state-of-the-art technology of IOT-based high power RF amplifier is designed, developed, and tested at VECC which is the first of its kind in India. A high voltage power supply rated at negative polarity of 30 kV dc/3.2 A is required for biasing cathode of IOT with crowbar protection circuit. This power supply along with crowbar protection system is designed, developed and tested at VECC for testing the complete setup. The technical difficulties and challenges occured during the design of cathode power supply, its crowbar protection techniques along with other supported power supplies i.e. grid and ion pump power supplies are discussed in this paper.

A high voltage power supply (HVPS) of rating-40 kV, 5 A is designed and developed based on pulse step modulation (PSM) technique for inductive output tube based RF amplifier. The commercial availability of such power supplies are very limited and that to at a very high cost. In future also, we shall need several PSM based HVPS of various ratings, so in-house development of a high voltage power supply is important to reduce the cost to less than half and also for easy maintenance. The present development is aimed to utilise a modern technique meeting all the important criteria, i.e., solid state based modular construction, crowbar-less design, reliable operation, voltage regulation with higher efficiency, fast response and most importantly easy to service. This paper deals with the design and development of HVPS rated at-40 kV, 5 A by using DSP TMS320F28335 as the main controller along with algorithms for the control system, interlocks and protections, test results, etc.

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