Why is measurement of leakage inductance important?
Leakage inductance (LL) may be undesirable in a wound
component, in which case it is important to measure the value to show that
it is low or, in some applications, such as electronic lighting ballasts
and resonant power converters, leakage inductance is deliberately
introduced and its value is an integral part of the circuit design.
In these applications, the leakage inductance provides an
energy storage medium that is essential to achieve correct operation of
the finished product.
It is therefore important that the value of leakage
inductance of the transformer is known to be within specified limits.