Effect of sequence discharge on components in a 600kJ PPS used for electromagnetic launch system

Author

Dai, Ling ; Wang, Yanzhao ; Zhang, Qin ; Li, Wenting ; Lu, Wanxin ; Dong, Hanbin ; Lin, Fuchang

Author_Institution

State Key Lab. of Adv. Electromagn. Eng. & Technol., Huazhong Univ. of Sci. & Technol., Wuhan, China

fYear

2012

Firstpage

1

Lastpage

6

Abstract

Pulsed Power Supply (PPS) applied in the electromagnetic launch system must have a compact design and high reliability. In this paper, a PPS for electromagnetic launch system has been built up. The main parts in PFU (Pulsed Forming Unit) are energy storage capacitors (8kV/75kJ), pulse-shaping inductor (10μH), pulse thyristor, crowbar diode and a Rogowski coil for current measuring. The energy storage density of the PFU is 0.74MJ/m³. Eight PFUs form a PFN of 600kJ. In many cases, the discharge current waveform of PFN must be adjusted for lower peak value and lower electromagnetic force. Based on this PFN, this paper analyzes the effect of the sequence discharge on the semiconductors. To prevent diode from overvoltage during the recovery process, different parameters of snubber circuit have been researched in the experiments. At last, two safe time sequence applied in the 600kJ PFN are confirmed based on simulation.

Keywords

diodes; discharges (electric); electric current measurement; electromagnetic forces; electromagnetic launchers; power capacitors; power inductors; pulse shaping; pulsed power supplies; reliability; snubbers; thyristors; PFN; PFU; PPS; Rogowski coil; crowbar diode; current measurement; discharge current waveform; electromagnetic force; electromagnetic launch system; energy 600 kJ; energy 75 kJ; energy storage capacitors; energy storage density; overvoltage diode; pulse thyristor; pulse-shaping inductor; pulsed forming unit; pulsed power supply; recovery process; safe time sequence; semiconductor sequence discharge; sequence discharge; snubber circuit; voltage 8 kV; Capacitors; Discharges (electric); Rails; Semiconductor diodes; Thyristors; Valves; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Launch Technology (EML), 2012 16th International Symposium on

Conference_Location

Beijing

Print_ISBN

978-1-4673-0306-4

Type

conf

DOI

10.1109/EML.2012.6325164

Filename

6325164