Pulse Transformer
The transformers which handle voltages and currents in the form of pulses are called pulse transformers. The use of such transformers is quite common in radar, television, digital computer and thyristor systems.
The functions of pulse transformers are:
(1) for changing the amplitude of a voltage pulse,
(2) for inverting the polarity of a pulse,
(3) for affecting dc isolation between source and load,
(4) for coupling different stages of pulse amplifiers.
The input voltage to pulse transformers is of discontinuous nature as shown in Fig.(a). The most important requirement of these transformers is that input pulse at the primary should be reproduced as accurately as possible at its secondary terminals. Fig.(b). shows a square wave pulse at the input terminals. The pulse width varies from a fraction of a microsecond to about 25 microseconds. Usually, a sufficient time elapses before the next pulse appears. The wavetorm of the output voltage at the secondary terminals can be determined through the use of equivalent circuit of the pulse transformer.
Fig, A
fig,B
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