Evaluation of a solid state 120 kV microsecond pulse charger for a 1–10 nanosecond pulse generator

Summary form only given. In this paper we present a solid state 120 kV microsecond pulse charger for our nanosecond pulse generator [1]. The pulse forming line of our nanosecond pulse generator must be charged with microsecond pulses to prevent pre-firing of its oil spark-gap. The pulse charger consists of three identical very compact pulse transformer units with integrated electronics. The electronics are mounted on a compact PCB and consist mainly of a number of parallel connected IGBT´s that switch a primary capacitor bank into the pulse transformer. Each pulse charger unit can generate 50 kV microsecond pulses into a 350 pF load at 1 kHz repetition rate. Connected together they are able to deliver more than 120 kV into a 100 pF load. This 100 pF load is the pulse forming line of our nanosecond pulse generator at its maximum length of 1 m. The pulse charger is able to operate in an EMI unfriendly environment due to its compact lay-out and optical triggering of the IGBT´s.