Jason A Ohnemus

US Patent:

20140028289, Jan 30, 2014

Filed:

Jul 26, 2012

Appl. No.:

13/559108

Inventors:

Jason A. Ohnemus - Rockford IL, US
David A. Fox - Rockford IL, US

Assignee:

Hamilton Sundstrand Space Systems International, Inc. - Windsor Locks CT

International Classification:

H02M 3/335
G01R 15/18

US Classification:

324127, 363 2108

Abstract:

A system for sensing voltage in an isolated converter includes an input circuit isolated from an output circuit using a first transformer, the first transformer having a primary coil and a secondary coil, wherein the output circuit includes an output inductor and an output capacitor, and wherein the input circuit includes a power source that provides power to the output circuit through the first transformer; a feedback winding coupled to the output inductor to form a second transformer; and a monitor circuit that calculates a voltage across the output capacitor using a voltage across the feedback winding, a voltage across the primary coil of the first transformer, a turns ratio of the first transformer, and a turns ratio of the second transformer in order to provide feedback to control the input circuit.

US Patent:

20130328538, Dec 12, 2013

Filed:

Jun 7, 2012

Appl. No.:

13/490509

Inventors:

David A. Fox - Rockford IL, US
Jason A. Ohnemus - Rockford IL, US

International Classification:

G05F 1/56

US Classification:

323282

Abstract:

A DC/DC converter includes an internal transistor and a current sensor that is operable to sense a current passing through the transistor. The DC/DC converter also includes an output current estimator module that estimates the output current based on the sensed transistor current.

US Patent:

20150097372, Apr 9, 2015

Filed:

Jun 20, 2013

Appl. No.:

13/922853

Inventors:

- Charlotte NC, US
David A. Fox - Rockford IL, US
Jason A. Ohnemus - Rockford IL, US
Albert L. Markunas - Roscoe IL, US

International Classification:

H02P 25/02
H02K 19/28
H02K 19/12

US Classification:

290 31, 290 46

Abstract:

A brushless, three phase wound field synchronous machine (WFSM) provides an electromechanical power transfer system wherein it may serve as both a starter and a generator. Power for the excitation system of the WFSM is provided by a three phase flux switching generator (FSG). The three phase FSG also provides position sensor functionality for the WFSM when the WFSM operates in the starter/motor mode.