Douglas J Dromgoole

US Patent:

57479828, May 5, 1998

Filed:

Dec 5, 1996

Appl. No.:

8/761047

Inventors:

Douglas John Dromgoole - San Diego CA
Anatoly Feygenson - Hillsboro NJ
Robert Charles Frye - Piscataway NJ
Ashraf Wagih Lotfi - Rowlett TX
King Lien Tai - Berkeley Heights NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G05F 500
H03H 700

US Classification:

323902

Abstract:

A silicon-on-silicon dual MCM apparatus comprising a printed circuit board having a voltage isolation boundary contained therein supporting a pair of multi-chip modules on either side of the voltage isolation boundary. The MCMs safely convey signals across the isolation boundary via discrete optical coupling means or the like. The optical coupling means allow safe and efficient conveyance of signals across the voltage isolation boundary enabling a designer to group high voltage components on one side of the boundary and low voltage components on the other side of the boundary. This obviates to a degree the need for multi-layered PCBs. A relatively large number of passive components (resistors and capacitors) are integrated into a silicon substrate with flip-chip analog integrated circuits (ICs). Operational characteristics of the controller are verified after integration and are compared to the discrete version. High voltage isolation requirements, interference, and noise are all considered to determine the most critical portions of the dual MCM layout and design.

US Patent:

54576202, Oct 10, 1995

Filed:

Jul 30, 1993

Appl. No.:

8/099781

Inventors:

Douglas J. Dromgoole - Dallas TX

Assignee:

AT&T IPM Corp. - Coral Gables FL

International Classification:

H02M 3335

US Classification:

363 21

Abstract:

In a switch mode power supply the switch current of the power switch is connected to a low pass filter network during the time interval when current is flowing through the power switch. The filter network is disconnected from the power switch when switch current is not flowing. This technique takes advantage of the fact that the average current through the power switch during its conduction interval is either equal to the output current of the power supply, or is proportional with the ratio between the average switch current and the output current being the fixed isolation transformer turns ratio.