1:43.4 fractionalturn ratio pulse transformer

The fractionalturn ratio pulse transformer was theoretically analyzed, including the relationship between rise time and the number of secondary winding turns, area of magnetic core cross section as well as voltagetime product. A 1:43.4 turn ratio pulse transformer was designed and built accordingly. The secondary leakage inductance is 157.3 μH and the stray capacitance is 412 pF. The rise time is 894 ns in low voltage test. High voltage test of the pulse transformer connected with a 420 Ω fictitious load has been performed in oil. An output pulse with a peak voltage of 42.7 kV and a rise time of 917 ns was generated．