Inductance calculations of printed windings of power transformers using partial inductance method

The method of printed windings of transformer-windings are printed on a printed circuit board (PCB) and all windings are embedded in a stack of these PCBs is a promising way in controlling the windings´ shape and air spacing in a fixed pattern; it eliminates the parameter variations in a great deal. The partial inductance method gives an easy and accurate approach to calculate loop inductance by the generalised partial inductance, which is derived from dividing the whole loop into finite length of elements. Self and mutual inductance are the summation of inductance contributed from individual elements. This is useful in predicting the leakage inductance which has been the most undesirable parameter in PWM converter. And this method can also be applied to transformers in resonant converters in which inductances have to be accurately controlled