Repetitive Nanosecond All-Solid-State Pulse Generator Using Magnetic Switch and SOS Diodes

摘要

This paper proposes a new high speed and high voltage pulser using the low-voltage thyristors and magnetic switches with ferrite core. The proposed scheme consists of a step-up transformer with the function of magnetic switch, primary charging circuit using low- voltage thyristors, and Fitch's scheme composed of two magnetic switches and two capacitors in the secondary side. The primary winding of the step-up transformer has only one turn. To reduce further the leakage inductance of the primary windings, 40 branches are used in parallel. To compress the pulse, Fitch's scheme is used. All switches in Fitch's scheme are magnetic switches with ferrite cores. The ferrite core has low core loss and no insulation problem. With the load of 48Omega and lkV DC input voltage, the experiment results show that the output voltage is 58kV, the pulse width is 72ns (FWHM), and the rising time is 30ns. The magnetic switch is changed with SOS diode. With same load, the pulse output voltage is increased to 63kV, the rising time is 32ns, and the pulse width (FWHM) is 63ns. With the 96Omega, the output voltage is 71kV, the rising time is 36ns, and the pulse width is 48ns.