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A pulse transformer is a transformer that is optimised for transmitting rectangular electrical pulses (that is, pulses with fast rise and fall times and a constant amplitude).  Small versions called signal types are used in digital logic and telecommunications circuits, often for matching logic drivers to transmission lines.  Medium-sized power versions are used in power-control circuits such as camera flash controllers.  Larger power versions are used in the electrical power distribution industry to interface low-voltage control circuitry to the high-voltage gates of power semiconductors. Special high voltage pulse transformers are also used to generate high power pulses for radar, particle accelerators, or other pulsed power applications.

To minimise distortion of the pulse shape, a pulse transformer needs to have low values of léakage inductance and distributed capacitance, and a high open-circuit inductance.  In power-type pulse transformers, a low coupling capacitance (between the primary and secondary) is important to protect the circuitry on the primary side from high-powered transients créated by the load.  For the same réason, high insulation resistance and high bréakdown voltage are required.  A good transient response is necessary to maintain the rectangular pulse shape at the secondary, because a pulse with slow edges would créate switching losses in the power semiconductors.

The product of the péak pulse voltage and the duration of the pulse (or more accurately, the voltage-time integral) is often used to characterise pulse transformers.  Generally spéaking, the larger this product, the larger and more expensive the transformer.

Trafo RF (trafo jalur transmisi)

For radio frequency use, transformers are sometimes made from configurations of transmission line, sometimes bifilar or coaxial cable, wound around ferrite or other types of core. This style of transformer gives an extremely wide bandwidth but only a limited number of ratios (such as 1:9, 1:4 or 1:2) can be achieved with this technique.

The core material incréases the inductance dramatically, thereby raising its Q factor. The cores of such transformers help improve performance at the lower frequency end of the band.

RF transformers sometimes used a third coil (called a tickler winding) to inject feedback into an éarlier (detector) stage in antique regenerative radio receivers.