Research Of High Repetition Rate Fast Pulse Power Supply

Nonthermal plasma will be widely used in pollution abatement, disinfections, surface modification, biogascleaning, thus, it activates many people's interest. The main advantage is that most of the energy is used to accelerate the electrons to produce active particles, however, the temperature of the plasma is on the order of room temperature. In order to avoid accelerating the particles, except electrons, and to avoid the glow discharge transferring to plasma arc, the pulsed power supply system should provide pulses with great voltage gradient (～1000V/ns), narrow pulse duration (～100ns), and high repetition rate (～10kHz).Recently, high power fast pulse high voltage power supply is widely used in scientific research and industry. But the weakness of them is obvious—large volume, complex system and so on. We present a new method to develop a high voltage and high repetition rate fast pulse generator by combining power electronics and pulsed power technology. The required target of the power supply is realized by two steps. First, the manufacture of the transmission line transformer. Secondly, the circuit of pulse forming. Voltage pulses of 0-20kV with a rise time of 100ns, a pulse dutation of 100ns, a pulse repetition rate of 0-10kHz, an energy per pulse of 0.5-1J, and the average power up to 0.5-1 kW have been achieved with total energy conversion efficiency of 90%.The dissertation introduces the principles of the high repetition rate fast pulse power supply. The theory and configuration of the transmission line transformer, charging of the energy storage capacitor, pulse forming are analyzed in detail. The PSpice simulation model has been established, and the simulation is completed. The input-output characteristics of every partials of the circuit of the pulse generator are analyzed by experiments. The results of the simulation and the experiment are compared.After the testing of the pulse power supply, we reached the expected goal and succeed in using the power supply in the experiments and it was running stably. The pulse power supply should have certain improvements in order to reach the higher demand of applications. Thus, the dissertation gives some proposals and expectations in the end.