Design and Implementation of high Voltage DC Power Supply

Abstract

DC voltages are mainly used for scientific research work and the main application of the high voltage dc is in test on cables with a relatively large capacitance, because if testing with AC voltage takes a very large current. High voltages are primarily produced for insulation testing of high voltage equipment under power frequency AC, DC, switching and lightning impulse voltages. For insulation testing equipment, the voltages are increased up to several million volts but currents are decreased to a few MA or maximum 1 ampere both for ac and dc test sets. In the fields of electrical engineering and applied physics, high voltage dc are required for several applications such as electron microscopes and x-ray units require high dc voltages of the order of 100kV or more, electrostatic precipitator, particle accelerators in nuclear physics, electrostatic painting and so on. Nowadays the high voltage dc power supply has increasingly demand in a smaller size and lighter weight. High switching frequency is required for its smaller size installa- tion. The report of the major project is based on the High Voltage DC Power Supply 10 kV, 100 MA. A compact power supply is proposed over the conventional large size power supply. In the proposed compact power supply high switching frequency is used to reduce the size of power supply and switching losses are minimized with the use of resonant technique. Switching losses are minimized so efficiency is also improved. Simulation of the proposed compact high voltage dc power supply is done by using PSIM 6.0 simulator and results are obtained for 10 kHz switching frequency and 100 kHz switching frequency. Zero voltage switching is achieved in both the case. The size of the power supply is more compact with 100 kHz frequency. So, hardware implementation is done with 100 kHz frequency and a compact high voltage dc power supply is developed. Simulation results are compared with the hardware results and it is found satisfactory.