Study on Frequency Response of Dbd Load: Characteristics and Equivalent Circuit of DBD Load

Abstract

The phase relationplot of the frequency response curves of DBD load as a function of angular frequencyhaving the same  and but different values of  is shown in figure 2. The resultsare shown for four values of = (0, 10k, 100k and 2M ohm). From the phase plot of frequency response,it is evident that the equivalent reactance of the plasma reactor is negativeindicating that the reactive part is due to capacitance. It implies that theDBD load is capacitive as seen from the secondary of high voltage transformerirrespective of frequency of operation and resistance of the DBD load. However, as is varied over a range from =0 to 2M a peak in phase curve is obtained, implying that there is a slightchange in the capacitive nature of the load. Further, as  is increased the peak of thisband shifts to a lower frequency. The DBD load has an equivalent circuitcomprising a capacitor  of the dielectric barrierconnected in series with a capacitor of the gas gap, connected across the secondary winding of high voltagetransformer and has a conducted path represented by , when DBD discharge occurs