I. E. Rebrov

High-voltage solid-state switches for microsecond pulse power

A method that controls solid-state insulated gate bipolar transistor (IGBT) switches, allowing one to increase their ON-state duration time from fractions of microseconds up to milliseconds, is proposed. It is shown that the ON-state duration of the switches is limited only by their overheating. The modular design of the high-voltage solid-state switch with a 16-kV operating voltage and 60-A pulse current is experimentally implemented.

Electrohydrodynamic effect resulting from high-frequency barrier discharge in gas

The formation of an electrohydrodynamic flow in atmospheric air by using a high-frequency barrier discharge distributed over the dielectric surface is investigated. The influence of variations in parameters of a fully solid-state pulse generator (with a peak voltage of 0–12 kV, a tunable repetition rate of 10–25 kHz, and a pulse duration of 7 μs) on the current of plasma ion emitter and velocity characteristics of airflow is considered.

Solid-State System for Copper Vapor Laser Excitation

Abstract The present paper describes an all-solid-state high voltage nanosecond pulse generator for pumping a copper vapor laser. The main feature of this device is using a high voltage switch composed of a stack of insulated gate bipolar transistors (IGBT), what makes it compacter and more cost effective than traditional systems based on thyratrons and vacuum tubes. A fast transformer circuit provides highly synchronous on/off control of the IGBT stack. Two-stage magnetic pulse compressor is used to enhance the system efficiency. The developed laser pumping system generates current pulses with amplitude of 230 A and rise time of 30 ns at pulse repetition rate of 15 kHz. Average laser output power of 13 W was obtained under these pumping conditions.

High voltage IGBT switch with capability of pulse width control

High voltage switch unit on a base of isolated gate bipolar transistors (IGBT) with operating voltage of 4.5 kV and capability of pulse width control is developed and investigated. The start-stop circuit of IGBT gates control lets the switch to be open for near unlimited periods of time up to be continually open at constant nanosecond delay time.

Analysis of electrode system for generation of high-power electrodynamic flow

A high-power electrodynamic flow in atmospheric air is numerically simulated and experimentally studied. An electrode system consisting of a cylindrical plasma emitter and a plane metal grid collector of ions is used to generate a flow with a speed of 2 m/s and a volume rate of 15 L/s.

Simulation of Intense Electrohydrodynamic Flow Based on Dielectric Barrier Discharge

This paper presents a numerical analysis of the intense EHD gas flow velocity distribution at atmospheric pressure. The system consists of a coaxial plasma emitter and a collector grid. The ion source is a dielectric barrier discharge distributed over the surface of the emitter. The computational results coincide with the experimental data which allow us to predict the maximum flow rate produced by the experimental setup.

A multidischarge actuator system for power electrohydrodynamic action on the boundary layer of aerohydrodynamic surfaces

We present the results of a study of a new multidischarge actuator system designed for active gas flow control on the basis of a three-electrode circuit with a shielding electrode, in which the role of an accelerating electrode is played by the solid equipotential sheath surface of the wing. The main parameters of the multidischarge actuator system and classical scheme of electrodes are compared—namely, the induced air flow velocity, average integral volume force, average consumed power, and energy efficiency coefficient calculated per unit length of the external electrode.

Characteristics of the effect of an impulse supply voltage on the structure and characteristics of a surface discharge

Results of an experimental investigation of surface barrier discharge in a three-electrode system are presented. An analysis is done of the flow intensity of charged species extracted from the plasma layer of the surface discharge by the field of high dc potential of the third electrode. A high unipolar periodic impulse voltage of 15-kHz frequency, impulse duration from 0.5 to 45 ms, and 150-ns impulse-front duration is used to form the surface discharge. A It is revealed that the voltage-impulse duration has a significant effect on the intensity of charged species flow (extracted current), the character of the influence being dependent on the voltage-impulse polarity. The influence of voltage-impulse duration on the surface-discharge current is revealed as well. Pictures of the structure of surface discharge at the rise and the fall of the voltage impulse made by means of a high-speed camera are presented. The difference of the discharge structure for different polarities of voltage impulse is revealed. It is suggested that the surface-discharge characteristics are dependent on a combination of a number of factors, such as the parameters of the impulse voltage, volume charge in the gas gap, and the charge on the barrier surface, as well as the material and surface structure of the barrier.

Thrust and thrust-to-power ratio in electrohydrodynamic propulsion electrode systems

The influence on thrust parameter and efficiency from geometric parameters and design features of the ionocraft electrode is considered, dependences were obtained. The most effective mode of work lifters of the considered structures is achieved at low current. The increase of distance between the corona electrode and the collector gives the growth of thrust and thrust-to-power ratio up to some distance. It is advisable to use emitters with smaller diameter to reduce losses to the formation of the corona.

Multiphase high-voltage high-frequency sawtooth wave generator

The generator of sawtooth wave with voltage of 1 kV and frequency of 300 kHz intended to power the pumping region of the electrohydrodynamic flow systems is presented in the work. By varying the storage inductor the range of the operating frequencies can be expanded from dozens of kilohertz to 1 megahertz. The generator also can operate at the resonance frequency, creating a quasi-sinusoidal signal form. The three-phase scheme are implemented. The phase shift can be regulated by the driving generator.