摘要 |
<p>A chip transformer comprising a substrate carrying a plurality of ferrite sheets (1 to 8), at least some of the ferrite sheets (1, 2, 6, 7, and 8) being provided with one or several conductor path segments (1b, 2b, 4b, 6b, 7b, 8b), where the conductor path segment(s( on each ferrite sheet is/are optionally connected to one or more conductor path segments on one or more of the other ferrite sheets to form a primary winding and a secondary winding of the transformer. The ferrite material is composed as follows Li0,5(1+t-z-c)Znz, Mnm, Tit, Coc, Fe(1-0,2z-0,6t-0,4m-0,2c- epsilon > where 0</=t</=0,2; 0,2</=z</=0,5; 0,2</=m</=0,4; 0,02</=c</=0;05; and epsilon is of the magnitude 0,06, Bi2O3 also being added. The latter material discloses a specific resistivity which is so high that additional isolating layers between the windings can be avoided. The omission of the isolating layers ensures a high degree of freedom as to positioning of the individual windings relative to one another. <IMAGE></p> |