Christopher A Ballard

US Patent:

20130127437, May 23, 2013

Filed:

Nov 22, 2011

Appl. No.:

13/302125

Inventors:

Everett E. Baker - Fort Wayne IN, US
Bashirul A. Polash - Fort Wayne IN, US
Christopher D. Ballard - Fort Wayne IN, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G05F 3/08

US Classification:

323312

Abstract:

A system includes a capacitor and a current source configured to draw a constant input current from a power source and to generate an output current. The current source includes an n-type field effect transistor that is biased to operate as a constant current source. The current source is configured to provide the output current to the capacitor and charge the capacitor during a first time period associated with operation of a load. The current source is also configured to provide the output current to the load and the capacitor is configured to provide an additional current to the load during a second time period associated with operation of the load. The load could represent an electronic device having a time-varying output power characteristic, such as a wireless radio.

US Patent:

20130221943, Aug 29, 2013

Filed:

Feb 27, 2012

Appl. No.:

13/406309

Inventors:

Everett E. Baker - Fort Wayne IN, US
Bashirul A. Polash - Fort Wayne IN, US
Christopher D. Ballard - Fort Wayne IN, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G05F 3/08

US Classification:

323312

Abstract:

A system includes a constant input current filter configured to draw a constant input current from a power source and to generate a variable output current. The constant input current filter includes a capacitor, a boost converter, and a buck converter. The boost converter is configured to receive at least a portion of the input current and to charge the capacitor using at least the portion of the input current during first time periods associated with operation of a load. The buck converter is configured to discharge the capacitor and to provide an additional current as part of the output current during second time periods associated with operation of the load. The load could represent an electronic device having a time-varying output power characteristic, such as a wireless radio.