Solid-state Pulsed Power Supply Design And Experimental Research

Now, the crux of the industrial application of pulse corona induced plasma chemical process (PPCP) technology is to develop the high power pulsed power generator with long operation lifetime, which should be more than 6000h on the condition of continuous and reliable operation. Due to the superiority of solid-state switches on lifetime and operation reliability compared with the traditional switches (spark gap switch or thyratron), the solid-state pulsed power generator with solid-state switches technology should be satisfied with the requirement of PPCP in terms of theory. According to the characters of each type of solid-state switches, a solid-state pulsed power generator which based on the integrated technology of series semiconductor switches, magnetic switch (MS) and saturable pulse transformer (ST) was developed in mind of the load property and output target. In accordance with the theory analysis, the working principle was simulated by PSPICE software. The experiment of eight fast switching thyristors (FST) in series for the solution of static and dynamic voltage-equilibrium problem and the conduction synchronization of FST in series was achieved. Also the triggering method and electric diagram were introduced. Based on the analysis and comparison of the magnetic materials' character and property, amorphous (1k101) was chosen as the core material of MS and ST. With consideration of ST's insulation and volume, the parameter of ST was determined by the theory analysis and computation of the primary winding. The generator experiment of former circuit of PT was completed. The main parameters of the generator were as follows: peak voltage 37.5kV with 30Ω load, pulse rise time 480ns, pulse width 1.05μs, repetition frequency 100Hz, and output power 3kW. The equivalent inductance and average magnetic conductivity of MS were involved in analysis of theory. Due to the comparison between theoretical analysis of pulse forming circuit's damped oscillation and experiment results, the working principle of MS was mastered. The conclusions that dB/dt (variation of magnetic induction field with time) was proportional with the peak value and ascending rate of excitation current and the great core loss of MS was determined by the high di/dt (variation of current with time) of load were obtained. According to the comparison and analysis of results between the experiment and simulation, the working properties of ST and MS were grasped and also the technology feasibility of such generator was testified. And the operation efficiency and total energy efficiency of each part were calculated and analyzed. And the total energy efficiency 55.28% of the experiment circuit was obtained. On the requirement of PPCP's energy efficiency, the improvement...