Multilayer HF power transformer for resonant inverter - has soft magnetic core of which one limb passes through holes in multilayer boards carrying prim. and sec. winding tracks

摘要

The function of a resonant choke is integrated into the transformer as stray inductance. The magnetic core (1) carries prim. and sec. windings in the form of multilayer flat conductive tracks sepd. by insulating layers on respective boards (2, 3), with holes for one limb of the core. The stray inductance is defined by the thickness of the insulating layer between the prim. and sec. winding boards which is not less than 1 mm. ADVANTAGE - Resonant circuit is formed by inductance of transformer itself and external capacitance.