PRODUCTION PROCESS FOR PLANAR TRANSFORMER BASED ON MULTILAYER PRINTED CIRCUIT BOARD Russian patent published in 2009 - IPC H05K3/46 

FIELD: physics, radio.

SUBSTANCE: invention refers to electric radio engineering and can be used for production of planar transformer designed for portable electric radio engineering devices. Technical result is ensured by that multilayer winding is made on galvanoplastic metal matrix surface at first with sequential production of single-layer windings with internal and external pads, and then double-layer print windings composing multilayer winding. Internal and external pads are made simultaneously with single-layer winding coils using copper electroplating on blank areas of the photoresist mask coating matrix surface. Internal pads of adjacent windings are soldered for double-layer windings, while external pads are soldered after double-layer windings are packaged in multilayer winding. Thus primary and secondary transformer windings are made. Thereafter they are glued together. Then holes are formed in windings wherein ferrite core is mounted to produce planar transformer based on multilayer printed circuit board. Method allows for planar transformers based on multilayer printed circuit board herewith applying both fine ferrite core type EN/3.5/5 in system E-E, and large core type Sh 68/21/50 which ensures transformer output characteristics as 100 V and 100 A, at supply voltage 12 V.

EFFECT: higher operational reliability of interlayer electric connections of transformer windings due to soldering of winding pads, possibility to produce winding coils of great cross-section and matching to great current capacity, ensured optimum transformation ratio and accordingly output voltage of transformer, integrability of transformer windings within multilayer printed circuit board during combined production process.

2 cl, 7 dwg