Title :
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
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;
Conference_Titel :
Electromagnetic Launch Technology (EML), 2012 16th International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4673-0306-4
DOI :
10.1109/EML.2012.6325164
