Study On Spiral Tesla Transformer And Its Applications

Using pulse transformer is a good method to construct the pulsed power system with excellent performance in peak power, average power, stabily, lifetime, etc. Compared with other types of transformers, spiral Tesla transformer doesn't only suffer from saturation and frequency of ferromagnetic material, but also have more advantages in long-life and highly repetitive applications with the characteristics of simple construction, small turn-to-turn capacitance, low cost and high trnasformation ratio.On the basis of theoretical analysis about the resonance charging circuit, an oil immersed spiral Tesla transformer with the turn ration of 3:660 has been developed. The energy transfer efficiency of prototype can be up to 40% with the peak transformer ratio more than 100 and the output voltage of 150 k V. The experiment results show that the peak trnasformer ratio increases with detuning coefficient. When the detuning coefficient is larger than 1.0, the energy transfer efficiency instead decreases with the transformer ratio. Besides, the largest rising rates of primary current will increase with charging voltage and decrease with the total inductance in primary circuit.A high voltage repetive nanosecond pulse generaotor based on the spiral Tesla transformer has been constructed. The construction and main components have been introducted. The method to charge the primary capacitance of transformer by filter capacitance through incutance can meet the quick charging demand in the repetitive operation mode. The output of Tesla transformer is sharpend by a spark switch. The pulse generator is capable of outputing the waveforms with the rising time of 30 ns, the voltage of 100 k V and the repetition rate of 500 Hz.Aimed at parameters and working conditions of the developing DC circuit breaker, a gas switch triggering system based on the Tesla transformer has been designed. To ensure the reliability, the resistance-capacity trigger network has been composed. The triggering process of the Tesla-type trigger system has been simulated in Pspice. Considering the insultation problem, electric power supply plans of the trigger system have been analyzed. Lastly, the triggering process is studied with four-stage experiment network.