Research Of High Repetition Rate Nanosecond Pulsed 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 (～1kHz).We present a new method to develop a high voltage and high repetition rate nanosecond pulse generator by combining power electronics and pulsed power technology. The required target of the power supply is realized by two stapes. First, the capacitor discharges controlled by SCR complete the pulses compression from millisecond to microsecond. Secondly, the pulses compression from microsecond to nanosecond is completed by Blumlein transmission lines and gas spark switch. The pulse generator can be used in Dielectric Barrier Discharge to generate high density and nonthermal plasma. It is the main energy supply for the research of hidden airplane. Voltage pulses of 0-20kV with a rise time of 20ns, a pulse dutation of 100ns, a pulse repetition rate of 0-2kHz, 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 nanosecond pulse generator. Fast charging for energy storage, two steps of charge and discharge, drive and protection of SCR, high repetition pulse transformer, gas spark switch, and Blumlein transmission line 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. At last, simulations and experiments of pulse DBD are completed, and the waveforms from simulations and experiments are similar.After the testing of the pulse power supply, we reached the expected goal and succeed in using the power supply in the experiments of pulse DBD, 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.