Switching electrical power supply utilizing miniature inductors integrally in a PCB

Electrical power supply comprising, in combination:

• (a) means for converting a line a.c. to d.c. and applying a resonant pulsation thereto at an operating frequency of at least 1.0 megahertz,
• (b) means defining a transformer with primary and secondary windings formed on surface areas of printed circuit board (PCB) means with inductive coupling material passing through the PCB substrate at primary and secondary winding locations thereon, such material forming an essentially closed magnetic loop outside the PCB, the primary and secondary winding turn ratio being selected to provide voltage step-down, current step-up,
• (c) means for applying said resonant pulsed d.c. to a transformer primary winding and applying a transformer secondary winding's induced pulse current to output terminals via rectifier and filter means, as a low voltage d.c.,
• (d) said resonant circuit means comprising switching means therein to control the pulsed current applied to the primary winding of the transformer,
• (e) voltage feedback means connected from the transformer secondary circuit to said resonant pulsation control switch to control pulsation,
• and (f) means for establishing a common thermal plane of the heat generating components of said power supply including at least the magnetic loop defining means of said transformer.