Epcos has presented its extended range of PQ ferrite cores. With the newly added core sizes PQ40/40 and PQ50/50, the full range of PQ cores now covers sizes between PQ16/11.6 and PQ50/50. The PQ cores have been developed in particular for transformers in switch-mode power supplies. The insertion height of these cores can be adjusted while retaining the same footprint by appropriate adaptation of the cores. The new ferrite cores can be used for both standard wire-wound transformers in AC-DC and DC-DC converters and for planar transformers.
Compared with conventional ETD/ER/E core designs, the main advantage of the PQ cores is the stable round centre leg and the larger outer surfaces, as a result of which the length of the copper wire can be reduced. Moreover, the larger outer areas provide better heat dissipation. The PQ core shape has been optimised in such a way that the same transformer performance as for an E core can be reached with smaller dimensions and less weight. The PQ cores are available in a wide range of ferrite materials: N49, N51, N87, N92, N95 and N97.
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