Datasheet

AN3180 Conclusions
Doc ID 17273 Rev 1 27/39
7 Conclusions
The ripple-steering technique, with its ability to reduce an inductor ripple current
theoretically to zero, has been discussed and its theoretical base has been outlined. The
construction of a coupled inductor is addressed and a practical design guide given to enable
its successful implementation.
A practical application of the ripple-steering technique has been shown: it refers to a
Transition-mode controlled PFC pre-regulator where the technique has been used to
minimize the input ripple current, which is a major limitation to the use of this simple and
efficient topology at higher power levels.
The experimental results have shown that the ripple-steering technique is very effective in
reducing the input ripple current and that considerable savings can be achieved in the
differential-mode input EMI filter, with the positive side effect of minimizing the loss due to
the filter itself.