High-voltage Pulse Generator Based On Pulse Transformer And Marx Generator

Pulsed power technology has been widely used in the fields of national defense, industry and scientific research. Development tendencies of pulsed power systems mainly include high power, high repetitive frequency and compactness. The paper presents a novel high power pulse generator based on pulse transformer and Marx generator. This system comprises mainly a Marx generator, which is charged to a high voltage by a pulse transformer. To verify the viability of this technology routine, a generator system with 3-stage Marx generator charged by an air-core pulse transformer is designed. The tested results are accordant with the design purpose. This work is of great importance to researches on accurate control and operating at repetition rate for pulsed power system. The detailed contents are as follows.1. The operating principle of the system is analyzedThe energy stored in the low-voltage capacitor banks is delivered to the capacitor banks of Marx generator by pulse transformer in a quick periode. The compact Marx generator with low loop inductance could release the energy to the resistive load in an extremely short time (100 ns) without Pulse Forming Line (PFL). A peaking structure is designed to reduce the rise time.2. The main design of the pulsed power is presentedAn air-core pulse transformer with high coupling coefficient of 0.926 is fabricated. The primary and secondary inductance is 24.35uH and 108.91mH respectively, and the boost ratio is supposed to be 61. A compact Marx generator with inductive isolators is fabricated. The pulse capacitors are connected in serial-parallel, with the holding voltage value of 300 kV and the capacitance of 36 nF. The spark gaps,inductors with the inductance of 30 uH and a transmission line as peaking capacitor are all fabricated. The peaking transmission line with the capatance of 0.53 nF is 130 mm long, 410 mm by external diameter, 230 mm by inner diameter3. The designed system is experimentally investigatedExperiments of the 3-stage Marx generator charged by a pulse transformer have been conducted, which verified the viability of this technology routine. A 290 kV voltage pulse which has 240 ns FWHM (Full Wave at Half Maximum) on a 15 ohm water resistance load is obtained, with the peaking voltage of 161 kV and the peaking rise-time of 11ns. Besides, the phenomenons of unstable established voltage and previous pulse are investigated. The future research is focused on stable operation,improving parameters and repetive operation.