Design of 60kV, 2Ons Solid-state Pulse Generator Based on Magnetic Reactor Driven Diode Opening Switch

Abstract

Here we present the design and implementation of a magnetic reactor driven diode opening switch (DOS) pulse generator, which is capable of delivering 20ns wide, 60 kV amplitude pulses into a 200 Omega load at a repetition rate of 1 kHz. The pulse generator is also capable of working without a diode stage to generate 100 ns 30 kV pulses into the same load. The generator consists of 3 isolated units with distinct functions. The first is an IGBT switched LC resonator, which generates a 2.3 mus wide 18 kV amplitude pulse into the next stage. The second unit is a 2-stage magnetic reactor using a saturable inductor wound on low-loss nanocrystalline core, which compresses the pulse width to 200 ns with the same amplitude. The compressed pulse can be directly delivered to a 200 Omega load through a 1:2 transformer and generate 100 ns wide 30 kV amplitude pulses. The output of the magnetic compression stage can also be fed into a diode output stage through the same saturable transformer for further compression. The DOS output unit utilizes 6 series connected VMI fast recovery diodes as opening switch to commute 300 A current into the load and produces 60kV 20ns pulses. The all-solid-state design helps to get reproducible pulses and reliable, long-life operation