The Development Of A Distributed Linear Pulse Transformer Model

Abstract

The constructional details of pulse transformers and their effects on waveforms present problems to designers of high voltage modulators. In applications of line type modulators where pulse flatness is critical, a pulse transformer can introduce ripple on the waveforms that cannot be compensated for by making adjustments to the pulse forming network. Some investigators have solved this problem experimentally by adding a damping network to the secondary winding to improve the pulse flatness. The lack of sufficient pulse transformer models has led the author to investigate a pulse transformer model that is based on the physical construction of an actual device. W. H. Bostick presented a useful pulse transformer model in chapter 12 of “Pulse Generators” of the MIT Rad. Lab. Series and discussed the windings’ transmission line effect. The waveform distortion caused by the transmission line effect is modeled into the Secondary by including a series inductance with the secondary capacitance to ground. Bostick claimed this to be “a crude approximation”.