Hybrid circuit with integral inductor - wound with turns partly on substrate and partly on flexible insulation ribbon

摘要

A typical application for the proposed hybrid circuit with an inductor is in telephone exchange circuits. The magnetic core (MK) is mounted on a substrate (Su) upon which a part of the winding (F) is arranged as a printed circuit. The remainder of the winding, to complete the turns around the core, is carried on a flexible ribbon (T). On this conductors (A) are arranged, equally spaced in parallel lines, e.g. printed on. The ribbon is placed over the core (MK) so that the conductor ends (A) coincide with the corresp. ends on the substrate. At jointing surfaces (KF1, KF2) the two are then connected, typically by soldering. The precise definition and spacing of conductors gives freedom from short circuits. There is lower space requirement compared with wire winding. This allows the use of larger cross-section cores. The winding can be made of copper rather than gold. The substrate need not be ceramic, and could, if necessary be flexible.