Method and apparatus for self-regeneration synchronous regulator

Details Method and apparatus for self-regeneration synchronous regulator Method and apparatus for self-regeneration synchronous regulator

1995-01-11

1997-01-07

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323224, 323287, G05F 156

Patent

active

055920713

ABSTRACT:
A synchronous regulator circuit including a transformer having a secondary inductor magnetically coupled to a primary inductor, where the secondary inductor is coupled to control a synchronous power switch. The secondary inductor operates to drive the synchronous power switch using self-regeneration during a flux reversal phase of each cycle. A timing circuit or simple pulse width modulation circuit (PWM) turns on the primary switch and turns off the synchronous switch during a power phase of each cycle, and then turns off the primary switch during the flux reversal phase of each cycle. The flux reversal of the secondary inductor drives the synchronous switch on, thereby achieving synchronous operation without an expensive dual output PWM. The present invention is illustrated using both a buck and a boost topology. A third switch is preferably used to clamp the synchronous switch off during the power phase.

REFERENCES:
patent: 3626277 (1971-12-01), Munson
patent: 4132925 (1979-01-01), Schmutzer et al.
patent: 4585988 (1986-04-01), Nakai
patent: 5485076 (1996-01-01), Schoenwald et al.

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