Novel Open Circuit Voltage Clamp Protection Method Based on Microsecond Pulse Current Source for DBD Application

The microsecond pulse supply based on flyback has the advantages of a simple circuit structure, few power components, a simple drive circuit, and convenient modular expansion. It has a wide application prospect in applying dielectric barrier discharge (DBD) plasma drive. However, the output of this type of microsecond pulse supply is a pulse current source, which, by Cload under DBD equivalent capacitive load conditions, charges the load capacitor, and generates a high voltage pulse voltage Upulse, generating discharge plasma. The smaller the load capacitance, the higher the amplitude of the pulse voltage generated. In practical engineering applications, inevitably, the load electrode connection is not strong. Still, it is fatal for the microsecond pulse current source, which will cause the output pulse voltage amplitude to be too high damaging the power supply and causing human contact safety problems. This paper proposed a resistor-capacitor-diode (RCD) branch, in which the voltage amplitude of the output terminal can be effectively limited by reasonably designing the voltage on the RCD energy storage capacitor Cs and the amplitude of the pulse output voltage Upulse by controlling the secondary opening mode of diode Ds. Finally, the effectiveness of the proposed method is verified by simulation experiments.