The Design And Implementation Of Repetition Pulsed Power System Based On RSD Devices

High-power high-speed semiconductor switch RSD (Reversely Switched Dynistor) has obvious advantages in the microsecond and sub-microsecond high-voltage high-current field. It can open fast and withstand high current and di/dt.This paper first described the structure of RSD and its converter principle, discussed the pre-injection control using the reverse-charge mechanism and the required amount of pre-charge for the normal opening process. Then, researched on the design of RSD pulse discharge circuit: Direct Triggering Circuit and Resonant Triggering Circuit. Direct triggering circuit is relatively simple, because the pre-charge voltage and the current regulation are very convenient to design, but generally suitable for application in the single pulse environment. On the other side, resonant trigger circuit is designed for the application of high power, high reliability, and repeated pulses environment. Next part, studied the mechanism of the magnetic switch which was used as a co-application switch with RSD. The magnetic hysteresis loop of magnistor was fitted with voltage and current which were measured in serial RLC oscillate circuit, then the relative parameters were distilled to help designing its saturation time. Discussed the effect of the saturated inductance and the loss of the magnetic switch and gave the design method to reduce losses, and then designed the magnetic degaussing circuit. Finally, this paper focused on the repetition pulsed power system based on RSD devices. The modules of the system consist that following as charging module, drive module, circuit protection module, cooling module, RSD-frequency circuit module and the load. Each module was designed and analyzed in the following part. And then established the modules and experimented.The results show that the repetition pulsed power system based on RSD devices is running normal. The transformer charging way is more easily designed and maintained, but the frequency is low: only 0.056Hz by the experiment, while the peak current is about 548 A, the pulse width is about 3.2μs, and the di/dt is about 3.42×10~2 A/μs. Voltage-multiplying charging way can achieve very high frequency, but the charging current is large which will affect the life of the devices. The experiment obtains a double of frequency waveforms: 10Hz, 20Hz, 30Hz, 40Hz, 50Hz, 60Hz, and their working voltage is about 2200 ~ 2400V, while the current peak is about 2300 ~ 2500 A, and the di/dt is about 500 A/μs. Switching power inverter supply charging way has the advantages of stable and fast charging current, but the charging module is complexity and high cost. The frequency that in the experiment is 10Hz, while the voltage is about 3100V, the current is up to 6500 A, and the di/dt is about 1300 A/μs .