Switching electrical power supply utilizing miniature inductors integrally in a PCB
First Claim
1. 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.
4 Assignments
0 Petitions
Accused Products
Abstract
Electrical switching power supply for microprocessors and the like comprising a high voltage d.c. source (30, 34, 32, 50) resonant circuit (38, 51, 42, 52) including a switching transistor (52) which is operated in Megahertz range and provides pulses, via a transformer (40), rectifier (56), smoothing choke (62) to a d.c. low voltage output terminal (66). The rate of switching is controlled by a pulse generator (54) which pulses variably in response to output voltage to thereby vary switching repetition rate and hold to a predetermined output voltage. The inductive elements use spirals (12A and 12A'"'"') of thin lines on the surface of a substrate board and ferrite plugs (20) passing through holes (22) in the board to provide miniature inductive elements built into the substrate for effective use in a microprocessor power supply, or the like, and in other applications. Power dissipating elements on the circuit are mounted to a common thermal ground (29) and the circuit as a whole, including such thermal ground is encapsulated to provide a plate form power supply.
264 Citations
10 Claims
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1. Electrical power supply comprising, in combination:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification