Abstract

The pulse forming network (PFN) has the advantages of compactness and long-pulse achievability, and is widely used in military and industrial applications. In this paper, a novel Blumlein-type PFN is investigated numerically and experimentally. Specifically, the device is composed of five Blumlein-type PFN units, which are parallelly connected in the axial direction, and the LC elements of each unit are distributed in the angular direction. Dimensions of the PFN are only Φ 560 × 345 mm2 due to the novel compact structure. Small volume is necessary in military and industrial applications, especially for some mobile platforms. Electromagnetic coupling in the structure is theoretically analyzed to improve the performance of the device. Importantly, the impedance of the structure is only 1.5 Ω, which can efficiently reduce insulation difficulty at the same power level. In order to improve the performance of the PFN, a sharpening switch is added in the circuit. Simulation results show that a 170 ns quasi-square pulse is obtained on a 1.5 Ω dummy load, and the jitter of the flap-top is only about 2%. The PFN is built and preliminarily studied in our laboratory. Quasi-square pulses with a peak voltage of 3.1 kV are obtained on a water load of 2.1 Ω. The jitter of the flap-top is ∼3.9%. Experimental results show reasonable agreement with numerical analysis.

Highlights

  • Pulsed power technology holds wide applications in military and industrial fields including high-power microwaves, x-rays, plasma science, beams surface treatments, etc.1–8 The pulsed power system in compact geometries is a topic of interest.9 Compactness can save cost and improve portability, which broaden the scope of use in a narrow space

  • The pulse forming network (PFN), which has the advantages of compactness and long-pulse achievability, could well meet the requirements of these potential applications

  • In some existing research studies, in order to improve the power capacity, several PFN units are connected by several switches;10–12 the impedance increases with the increase in the number of PFN units

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Summary

INTRODUCTION

Pulsed power technology holds wide applications in military and industrial fields including high-power microwaves, x-rays, plasma science, beams surface treatments, etc. The pulsed power system in compact geometries is a topic of interest. Compactness can save cost and improve portability, which broaden the scope of use in a narrow space. In Ref. 13, in order to reduce the impedance, five PFN units are connected in parallel angularly; the volume of the device is large. In order to make better use of the space, LC elements are distributed angularly and Blumlein-type PFN units are connected in parallel axially. One problem is that the compact structure results in stronger and complicated electromagnetic coupling, which affects the performance of the pulse modulation devices. To overcome this problem, a double switch modulation circuit is employed in this paper. NUMERICAL ANALYSIS OF THE BLUMLEIN-TYPE PFN AND DOUBLE SWITCH PULSE MODULATION CIRCUIT

Design of the low impedance Blumlein-type pulse forming network
Double switch pulse modulation circuit
The modifiability of the Blumlein-type pulse forming network
PRELIMINARY EXPERIMENTS OF THE BLUMLEIN-TYPE PFN AND PULSE MODULATION CIRCUIT
CONLUSIONS
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