A. L. Stepanyants

High-Voltage RSD Switches of Submegaampere Current Pulses of Microsecond Duration

Two versions of a switch circuit based on an assembly of reverse switch-on dynistors (RSDs) with a 25-kV operating voltage connected in series are described. Their main feature is a decrease in the device dimensions as a result of introducing two successively triggered low-power dynistor units into the control circuit and assembling several RSD structures in a common ceramic housing. The first circuit version is used in the discharge circuit of the capacitive energy storage in the operation into a mismatched load and can switch alternating pulses with a 750-μs duration with amplitudes of the first pulses of the forward and reverse currents of 130 and 15 kA, respectively. The second version employs the crowbar regime and makes it possible to form unipolar current pulses with a 190-kA amplitude and a 500-μs duration in the load circuit.

“A high-frequency semiconductor generator of high-voltage nanosecond pulses”

A high-frequency generator of high-voltage nanosecond pulses based on an assembly of drift step-recovery diodes is described. A circuit that includes parallel transistor chains for the formation of forward and reverse currents of drift diodes is presented. The results of tests of this generator are presented. Voltage pulses with an amplitude of 2.5 kV, a duration of 2 ns, and a pulse repetition rate of 300 kHz were obtained across a 50-Ω load.

A High-Frequency Reverse Switch-On Dynistor Generator for High-Power Induction Heating Systems

A generator of high-frequency harmonic oscillations connected as a multicell serial inverter with recuperation diodes is described. Maximum power is 50 kW, operating frequency is 50 kHz, overall dimensions are 75×85×85 cm, weight is 130 kg, and efficiency is ∼90%.

Formation of High-Power Pulses of Nanosecond Duration by Generators on Reverse Switch-on Dynistors with Sharpening Circuits Based on Diode Opening Switches

The basic principles of constructing generators of nanosecond pulses on reverse switch-on dynistors with sharpening output circuits based on diode opening switches are considered. The results of an experimental study of a high-power generator incorporating such a dynistor; a step-up pulse transformer; and a high-voltage diode opening switch, which is an assembly of drift step-recovery diodes connected in series, are presented. The output voltage pulses of the generator with an amplitude of ∼45 kV, a duration of ∼50 ns, a rise time of ∼10 ns, and a repetition rate of 1 kHz are applied to a load resistance of 25 Ω.

Generator on the basis of reversely switched dynistors forming pump pulses for a copper-vapor laser

A generator designed on the basis of reversely switched dynistors and forming pump pulses for a coppervapor laser is described. The operation of the circuit is considered in detail. Its main components are a low-voltage high-current switch operating on the basis of a reversely switched dynistor (RSD), a step-up pulse transformer, and a system for magnetic compression of pulses. It is shown that a RSD makes it possible to increase the efficiency and decrease the dimensions of the generator in comparison with thyristor systems. Pulses of electric current through the active element of a copper-vapor laser with a 40-ns leading edge and a repetition rate of 8 kHz are formed. Laser radiation with an output power of 2 W is obtained.