Parameterized Nanosecond Pulse Realization Through Parametrical Modulation of Timing Sequence of Switches in Marx Circuit

The characteristics of gas discharge are closely related to the features of high-voltage pulses, especially to the rising and falling time of pulse. A parameterized pulse control method based on improved Marx generator is proposed to obtain parameterized nanosecond high-voltage pulses to match different discharge circumstances. Different parameters of nanosecond pulses are realized in real time by parametrical modulating timing sequences of switches in an improved Marx generator. Experimental results indicate that the ability of generating pulses is with 0-20 kV amplitude, 0-1 ms width (flat top), 50-500 ns or faster rising/falling time, below 5% overshoot, and a maximum 5 kHz repetitive frequency at 20 kV on a matched 0-100 pF capacitance load. The shape of pulse waveform including triangular, rectangular, or the combination of the two kinds of pulse waveform can be achieved. The discharge characteristics in the dielectric barrier discharge device driven by the parameterized pulse, especially changing the rising time of pulse, are investigated. The uniform discharge is observed, and the discharge intensity is doubled while reducing the rising time of pulse from 500 to 50 ns, and the intensity of the N2 spectrum increased to 2.5 times.