Investigation Of A Solid-state Generator And Its Related Technologies

Defense and industrial applications stimulated intense interests in the area of pulsed power technology towards the systems with high power, high repetition rate, solid-state characteristics, and compact structure. The solid-state generator based on magnetic switch and rolled strip pulse forming line (RSPFL) meets these requirements very well and it is an important candidate in this area. In this thesis, related technologies of the solid-state accelerator have been investigated based on the theoretical analysis, numerical simulation, and experiments. Results of this paper are of interest to developing the solid-state pulse power accelerator. The detail results are as follows.First of all, In order to realize the fast-charge process for the RSPFL, the two-stage magnetic compression system is designed based on the"racetrack type"magnetic cores. The circuit is given with amorphous magnetic cores and pulse capacitors. Experimental investigations were carried out to optimize the structures of magnetic switch. The pulse compression, from 8.4μs to 1.7μs, then to 0.8μs, was achieved using the two-stage magnetic compression system in which the second stage magnetic switch has only one core supporting 4 windings. The energy efficiency of the two-stage magnetic compression system is higher than 85 % and the pulse compressions rates are 5 and 2, respectively.Secondly, two new kinds of methods are employed to reduce the volume and weight of the RSPFL, and improve output characteristics of the RSPFL, respectively. Three solid-state RSPFLs (using DMD film as the dielectric) with an output impedance of 1.1 ?, electric length of 200 ns was manufactured based on the theoretical analysis and electromagnetic field simulation to verify the idea. The dimensions of the RSPFLs are all smaller thanΦ300mm×220mm. In our experiment, a quasi-square pulse of 12 kV, 230 ns (FWHM) on the load was obtained. Rise-time and the output power are about 15 ns and 130 MW. RSPFL designed using the"double-plate method"possessses the similar waveform as the conventional method, but the volume and weight are reduced. The waveform on the load of the RSPFL designed using the"interval-ground method"was much better than the waveform of the conventional ones.Thirdly, compared with the"circle-wise"magnetic core, the"raceway type"magnetic core was researched, being favorable for connecting with RSPFL. The characteristics of the core were measured both in the high frequency and low frequency situations. The B-H curves at the different positions of the core are depicted.Lastly, According to our solid-state accelerator scheme, some investigations have been done on the magnetic switch when used as the main switch of the solid-state generator. Characteristics such as the switching time, interlamination voltage, saturated inductance, and loss of the core, which can affect the performance of the magnetic switch, are derived in the case of the fast pulse input. Solution is given for the pre-pulse problem of the magnetic switch when used as the main switch. Based on these results, a magnetic-switch with eleven cores and one winding was fabricated as the main switch of the solid-state pulsed power accelerator. Experimental research was carried out on the main-switch driving by the manufactured RSPFL. A quasi-square pulse of 9 kV, 230 ns (FWHM) was obtained on the matched load. The rise-time was less than 80 ns.