Design And Simulation Of Compound High Voltage Pulse Power Supply

With the development of civil pulsed power technology, especially in the material surface modification, environmental pollution repair and treatment, food industry sterilization, biomedical as well as many other areas with a large number of applications, the demand for high repetition rate high voltage nanosecond pulse power supply is proposed. Because of the Compression of nanosecond pulse on time scale, the transition of discharge to arc and spark discharge is suppressed, therefore easy to get stable non equilibrium plasma. So it would be a critical technology to develop a reliable nanosecond pulse generator.This paper fundamentally based on power electronic technology and pulsed power technology, designed and manufactured a high repetition rate and high-voltage nanosecond pulse power supply. The power supply is composed of three parts. First of all, civil electricity through the power thyristor will be sent into a voltage double rectifier circuit to obtain a direct high voltage, and then the direct high voltage will be sent into energy storage circuit, by then the pulse voltage is obtained through rotating the spark switch to capacitor. Finally, the pulse voltage wave will be reshaped and condensed by magnetic compression circuit.By comparing the current widely utilized topological structure, the development of nanosecond pulse power supply is described in detail in this paper. We adopted C-W half wave voltage doubling rectifier combining with the practical experimental demands. Through the establishment of Multisim simulation model, the key parameters of the circuit have been particularly studied. The thyristor trigger circuit, protection circuit, control circuit, detection circuit, auxiliary power supply circuit are designed and made. The effects of energy storage circuit parameters on the output voltage are analyzed.Meanwhile, we applying Pspice software to simulate the output waveform and determine the circuit parameters. The traditional spark switch structure has been improved with a novel disc type spark switch is proposed. Then the experimental waveforms are given and the experimental results are compared and analyzed.Finally, the working parameters of magnetic switch are derived so as to analyze the working principle of magnetic compression circuit. The material employed in the magnetic switch is analyzed for which to reduce the loss of magnetic switch. Pspice software has been applied to simulate and calculate the pulse compression and the circuit delay function of the magnetic circuit. Analysis of the working process of magnetic compressed circuit without magnetic core reset has been worked out. What is more, in order to improve the bottom overshoot of output pulse, the slightly improved circuit topology is presented. And the magnetic switch and saturable transformer are designed.