Research Of Repetition Frequency Pulse Power Circuit Based On RSD

In civilian as well as nvironmental protection, food industry, war industry, andmanufacture industry, there is a growing demand for Repetition Frequency pulse powercircuit that can produce high power pulse at relatively high repetition rate. Pulse powerswitch is the key to the Repetition Frequency pulse power circuit. The disadvantages of gasswitch are short life and low repetition rate. The advantages of semiconductor pulse powerswitch are long life, high repetition rate and low dissipation. In high Repetition Frequencypulse power supply, the gas switch may be replaced gradually by semiconductor pulsepower switch. Reversely Switched Dynistor(RSD), a new kind of high-powersemiconductor device based on principle of reverse recharged, is a preferred candidate forthe switch applied in the pulse power circuit. In this dissertation, pulse power circuit basedon RSD modeling, design and experiment of recharge circuit of high voltage cap, magneticswitch technology, and topology of pulse power circuit base on RSD are researchedthoroughly.In this dissertation，the structure of RSD and elementary pulse power circuit based onRSD is introduced. The shortage of current compute formula of RSD terminal current isthat only square wave and standard sine wave can be computed in this formula. Based onconception of I2t, a new kind of compute formula of RSD terminal current which can beused in most RSD pulse discharge circuit was derivated.The analysis, design, and experiment of RC linear charging circuit, LRC resonantcharging circuit, and IGBT series resonance charge circuit were processed, and the threekind of charging circuit were applied in the RSD Repetition Frequency pulse power circuit.Charge frequency of LRC charge circuit is high, but the charging current is large whichmay affect the life of the devices. The LRC resonance step-up charge circuit which appliedin RSD pulse power circuit was bring forward, and the step-up transformer can replaced byLRC under discharge voltage of5kV. The formula of steady voltage U of dischargecapacitance C was derivated. Simulation Results show that, U decrease with increase of C;the increase percent of U changes is12%with charge circuit inductor L in5μH-100μH; thedecrease percent of U changes is10%with charge circuit resistor R in0.01-0.1; the increasepercent of U changes is40%with discharge circuit inductor L0in0.06μH-2.4μH; the decreasepercent of U changes is73%with discharge circuit resistor R0in0.01-0.1. The theoreticalcalculation result of U is1.3kV; while the experiment result is900V under C of9.4μF, thevoltage of direct current supply of327V. The study of experiment curve shows that the longturn-off time of turn-on switch SCR and turn-off switch diode results decrease of experiment voltage of U. IGBT serial resonant constant current charger has the advantages of stable andfast charging current, but the charging module is complexity and high cost.Direct triggering circuit, resonant triggering circuit and transformer triggering circuitof RSD are analyzed. Direct triggering circuit is relatively simple, design of the pre-chargevoltage and current regulation are convenient, but it generally suitable for high power singlepulse circuit. Resonant trigger circuit is suitable for Repetition Frequency pulse power circuitbased on RSD. Voltage higher than10KV is preferred to be triggered by the transformer.Principle of magnetic switch is introduced. Data curve of dynamic inductance andcurrent of magnetic switch is computed, and dynamic magnetic switch inductance modelbased on data table was built in M file. The magnetic reversed circuit was designed.Pulse power circuit model which include RSD physical model was built inSABER-MATLAB Co-Simulation Environment. Simulation Result shows that Triggeringtime tRchanges little with Resistance load in0.01-1, but influence obviously withinductance load and resistance load above1. The result of calculation and experimentalresult accord with very well. tRin high voltage experiment can be estimated fromexperiment results of triggering time of low voltage experiment.Voltage of single pulse discharge test of RSD is10KV, current peak of RSD is114.5KA, and power peak is52MW.4.5kJ of total losses of RSD is5.6%of80kJ of releaseenergy. The current peak of3.1kV experiment is6.5kA, and the di/dt is about1.3kA/μs.Repetition Frequency pulse power circuit based on RSD is designed. The parameter ofcircuit and magnetic switch were designed with2.4kV of the operation voltage. Continuouspulse discharge frequency of experiment is10-60Hz, respectively, the experimental peakcurrent was2.44kA with9μs pulse width, the number of continuous discharge pulse is5000with10Hz of pulse discharge frequency. The number of continuous discharge pulse is1000with20-60Hz of pulse discharge frequency. When the pulse discharge frequency changedfrom10Hz to60Hz, the peak current decreased from2.44KA to2.21kA, the decreasepercent is4.5%. The long-time discharge character of RSD was tested with460V of theoperation voltage. The frequency of experiment is10-50Hz, respectively. The experimentalpeak current was1.4kA with18μs pulse width, the time of continuous discharge test is497minute and total number of discharge was710000.Frequency of RSD Burst RepetitionFrequency pulse discharge experiment is500Hz, the number of continuous discharge pulseis10, and the discharge voltage is1.2kV.The theoretical analysis and experiment results show that the advantage of RepetitionFrequency pulse power circuit based on RSD is well stabilization, high frequency, highpower, and narrow pulse width.