Design optimization and experimental study on stray capacitances of annular pulse transformer

The solid state modulator based on high ratio pulse transformer which utilizes nouniformity secondary to output 70 kV for 200 s is discussed. The stray capacitances of the annular pulse transformer are systematically analyzed. The relationship between static stray capacitances and equivalent stray capacitances when secondary is uniformity distribution is also presented. Furthermore, the analytic expression of the equivalent stray capacitances when secondary is nouniformity distribution is discussed. The experimental result shows that the equivalent stray capacitance reduces 30% when secondary is nouniformity distribution. The high voltage pulse with 2.5 s rise time and 4.3% overshoot can be achieved when the ratio of pulse transformers with nouniformity distributed secondary is 1∶100.