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259Conduction and Switching Losses

Note that in Figure 8.6 , the main inductor is “

coupled, ” because it has a freewheeling path

available. But the leakage (or parasitic) inductance is “ uncoupled, ” because it has no path

to send forth its energy. It therefore expectedly “ complains ” —in the form of a voltage spike

(whenever we try to change the current through it). However, in our analysis, we will be

assuming this leakage inductance is very small (though not necessarily negligible either). We

will find that this results in certain artifacts in the switching waveforms, which makes them

appear slightly different, as compared ...