80 kV adjustable high-voltage rectangle-wave pulsed power supply

A high-voltage pulsed power supply for testing the character of ZnO varistor, with adjustable pulse width, repetition frequency and running time, and most 80 kV rectangle wave-output voltage, is developed. Rectangle-wave voltage pulse is produced by pulse forming line, pulse transformer and adjustable load. Two spark gap switches work under the control of the program which generates sequence pulses by a high speed I/O data card. All control and sample signals are transmitted by optical fiber in order to reduce the influence of electromagnetic interference on the whole control system. A user-friend human-machine interface has been built on LabVIEW platform. The experimental result shows that the automatic control system runs stably, reliably, and has a strong anti-interference ability. The output voltage of the supply power is over 80 kV, pulse width over 25 s, rise time less than 0.7 s. The output voltage and pulse width can be adjusted within the anticipant range. The output current is adjustable from 0 up to 40 A in ZnO varistor testing.