Power supply for obtainig low-temperature plasma jets

The paper describes the results of the study of operational modes of a specialized high-voltage power supply, operating as part of the system for obtaining low-temperature plasma jets. The power supply provides an initiation and then supplying of atmospheric-pressure glow discharge in the vortex airflow at average currents up to 0.15 A and air flow rates up to 0.8 l/s. The proposed circuit provide pulsating discharge current at 100 Hz frequency that leads to the appearance some features during the discharge sustaining in the plasmatron. One of the significant advantages of the inductive-resistive current limiting method is the system has the properties of self-limiting of short-circuit current magnitude and maximum output power value. The use of inductive ballast in the AC circuit allows reducing power losses on the ballast resistor and increasing the total efficiency of the power supply system. It shown that the inductive-resistive limiting of discharge current is acceptable in the implementation of the power supply for nonsteady-state plasmatron. The power supply provides stable sustaining of the discharge in the gas flow when external conditions (for example, the value of the gas flow rate or the configuration of the electrode system of the plasmatron) change in a wide range.

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