Patents by Inventor Douglas E. Keiter
Douglas E. Keiter has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 11635197Abstract: In one aspect, luminaires are described herein having sensor modules integrated therein. In one aspect, a luminaire described herein comprises a light emitting face including a LED assembly. A sensor module is integrated into the luminaire at a position at least partially overlapping the light emitting face. In another aspect, a luminaire described herein comprises a LED assembly and a driver assembly. A sensor module is integrated into the luminaire along or more convective air current pathways cooling the LED assembly or driver assembly.Type: GrantFiled: December 16, 2021Date of Patent: April 25, 2023Assignee: IDEAL INDUSTRIES LIGHTING LLCInventors: Andrew Bendtsen, Kurt Wilcox, Boris Karpichev, John Roberts, David Goelz, Douglas E Keiter, Randy Bernard
-
Publication number: 20220107084Abstract: In one aspect, luminaires are described herein having sensor modules integrated therein. In one aspect, a luminaire described herein comprises a light emitting face including a LED assembly. A sensor module is integrated into the luminaire at a position at least partially overlapping the light emitting face. In another aspect, a luminaire described herein comprises a LED assembly and a driver assembly. A sensor module is integrated into the luminaire along or more convective air current pathways cooling the LED assembly or driver assembly.Type: ApplicationFiled: December 16, 2021Publication date: April 7, 2022Inventors: Andrew Bendtsen, Kurt Wilcox, Boris Karpichev, John Roberts, David Goelz, Douglas E. Keiter, Randy Bernard
-
Patent number: 11231170Abstract: In one aspect, luminaires are described herein having sensor modules integrated therein. In one aspect, a luminaire described herein comprises a light emitting face including a LED assembly. A sensor module is integrated into the luminaire at a position at least partially overlapping the light emitting face. In another aspect, a luminaire described herein comprises a LED assembly and a driver assembly. A sensor module is integrated into the luminaire along or more convective air current pathways cooling the LED assembly or driver assembly.Type: GrantFiled: July 22, 2020Date of Patent: January 25, 2022Assignee: IDEAL INDUSTRIES LIGHTING LLCInventors: Andrew Bendtsen, Kurt Wilcox, Boris Karpichev, John Roberts, David Goelz, Douglas E Keiter, Randy Bernard
-
Publication number: 20200348015Abstract: In one aspect, luminaires are described herein having sensor modules integrated therein. In one aspect, a luminaire described herein comprises a light emitting face including a LED assembly. A sensor module is integrated into the luminaire at a position at least partially overlapping the light emitting face. In another aspect, a luminaire described herein comprises a LED assembly and a driver assembly. A sensor module is integrated into the luminaire along or more convective air current pathways cooling the LED assembly or driver assembly.Type: ApplicationFiled: July 22, 2020Publication date: November 5, 2020Inventors: Andrew BENDTSEN, Kurt WILCOX, Boris KARPICHEV, John ROBERTS, David GOELZ, Douglas E. KEITER, Randy BERNARD
-
Patent number: 10724728Abstract: In one aspect, luminaires are described herein having sensor modules integrated therein. In one aspect, a luminaire described herein comprises a light emitting face including a LED assembly. A sensor module is integrated into the luminaire at a position at least partially overlapping the light emitting face. In another aspect, a luminaire described herein comprises a LED assembly and a driver assembly. A sensor module is integrated into the luminaire along or more convective air current pathways cooling the LED assembly or driver assembly.Type: GrantFiled: March 11, 2019Date of Patent: July 28, 2020Assignee: Ideal Industries Lighting LLCInventors: Andrew Bendtsen, Kurt Wilcox, Boris Karpichev, John Roberts, David Goelz, Douglas E. Keiter, Randy Bernard
-
Publication number: 20190203922Abstract: In one aspect, luminaires are described herein having sensor modules integrated therein. In one aspect, a luminaire described herein comprises a light emitting face including a LED assembly. A sensor module is integrated into the luminaire at a position at least partially overlapping the light emitting face. In another aspect, a luminaire described herein comprises a LED assembly and a driver assembly. A sensor module is integrated into the luminaire along or more convective air current pathways cooling the LED assembly or driver assembly.Type: ApplicationFiled: March 11, 2019Publication date: July 4, 2019Inventors: Andrew Bendtsen, Kurt Wilcox, Boris Karpichev, John Roberts, David Goelz, Douglas E. Keiter, Randy Bernard
-
Patent number: 10271390Abstract: A lighting fixture includes a solid-state light source and driver circuitry. The solid-state light source includes at least one light emitting diode (LED). The driver circuitry includes one or more silicon carbide (SiC) switching components, and is coupled to the solid-state light source. Further, the driver circuitry is configured to receive an alternating current (AC) input voltage and generate a driver output current for driving the at least one LED from the AC input voltage. By using silicon carbide (SiC) for the switching components in the driver circuitry, the efficiency of the driver circuitry and thus the lighting fixture may be significantly increased, while simultaneously reducing the cost and complexity of the driver circuitry and thus the lighting fixture when compared to conventional lighting fixtures.Type: GrantFiled: August 25, 2014Date of Patent: April 23, 2019Assignee: Cree, Inc.Inventors: Yuequan Hu, Nicholas William Medendorp, Jr., Douglas E. Keiter
-
Patent number: 10234127Abstract: In one aspect, luminaires are described herein having sensor modules integrated therein. In one aspect, a luminaire described herein comprises a light emitting face including a LED assembly. A sensor module is integrated into the luminaire at a position at least partially overlapping the light emitting face. In another aspect, a luminaire described herein comprises a LED assembly and a driver assembly. A sensor module is integrated into the luminaire along or more convective air current pathways cooling the LED assembly or driver assembly.Type: GrantFiled: June 13, 2016Date of Patent: March 19, 2019Assignee: CREE, INC.Inventors: Andrew Bendtsen, Kurt Wilcox, Boris Karpichev, John Roberts, David Goelz, Douglas E. Keiter, Randy Bernard
-
Patent number: 10203103Abstract: In one aspect, luminaires are described herein enabling independent thermal management of driver and LED assemblies. For example, a luminaire comprises a driver assembly vertically integrated with a LED assembly, the driver assembly comprising a driver heatsink having an interior in which a circuit board assembly is positioned, and the LED assembly comprising an array of LEDs and LED heatsink, wherein a barrier is positioned between the driver heatsink and the LED heatsink, separating convective cooling of the driver assembly from convective cooling of the LED assembly.Type: GrantFiled: February 8, 2016Date of Patent: February 12, 2019Assignee: Cree, Inc.Inventors: Andrew Bendtsen, Kurt Wilcox, Boris Karpichev, John Durkee, John Roberts, David Goelz, Douglas E. Keiter, Randy Bernard
-
Patent number: 9844107Abstract: Driver circuitry is coupled between a power supply and at least one LED in a solid-state lighting fixture, such that a non-isolated direct current (DC) path exists between the power supply and the at least one LED. The driver circuitry is configured to receive an AC input voltage and generate a driver output current for driving the at least one LED from the AC input voltage. By using driver circuitry that is non-isolated from the at least one LED in the solid-state lighting fixture, the efficiency of the driver circuitry may be increased, while simultaneously reducing the cost and complexity of the driver circuitry compared to conventional driver circuitry.Type: GrantFiled: August 25, 2014Date of Patent: December 12, 2017Assignee: Cree, Inc.Inventors: Yuequan Hu, Nicholas William Medendorp, Jr., Douglas E. Keiter
-
Publication number: 20170227207Abstract: In one aspect, luminaires are described herein having sensor modules integrated therein. In one aspect, a luminaire described herein comprises a light emitting face including a LED assembly. A sensor module is integrated into the luminaire at a position at least partially overlapping the light emitting face. In another aspect, a luminaire described herein comprises a LED assembly and a driver assembly. A sensor module is integrated into the luminaire along or more convective air current pathways cooling the LED assembly or driver assembly.Type: ApplicationFiled: June 13, 2016Publication date: August 10, 2017Inventors: Andrew BENDTSEN, Kurt Wilcox, Boris Karpichev, John Roberts, David Goelz, Douglas E. Keiter, Randy Bernard
-
Publication number: 20170227208Abstract: In one aspect, luminaires are described herein enabling independent thermal management of driver and LED assemblies. For example, a luminaire comprises a driver assembly vertically integrated with a LED assembly, the driver assembly comprising a driver heatsink having an interior in which a circuit board assembly is positioned, and the LED assembly comprising an array of LEDs and LED heatsink, wherein a barrier is positioned between the driver heatsink and the LED heatsink, separating convective cooling of the driver assembly from convective cooling of the LED assembly.Type: ApplicationFiled: February 8, 2016Publication date: August 10, 2017Inventors: Andrew BENDTSEN, Kurt WILCOX, Boris KARPICHEV, John DURKEE, John ROBERTS, David GOELZ, Douglas E. Keiter, Randy Bernard
-
Patent number: 9288863Abstract: A lighting apparatus includes at least one light emitting device and a reconfigurable driver circuit configured to drive the at least one light emitting device with an intensity that varies responsive to a dimming signal according to an adjustable mapping of the dimming signal to output of the light emitting device. In some embodiments, the mapping may be configurable using circuit component selection. In further embodiments, the mapping may be provided by a data input.Type: GrantFiled: March 14, 2013Date of Patent: March 15, 2016Assignee: Cree, Inc.Inventors: Michael Burbank Gilliom, Douglas E. Keiter, Danwei Liu, Michael Walters
-
Publication number: 20160057824Abstract: A lighting fixture includes a solid-state light source and driver circuitry. The solid-state light source includes at least one light emitting diode (LED). The driver circuitry includes one or more silicon carbide (SiC) switching components, and is coupled to the solid-state light source. Further, the driver circuitry is configured to receive an alternating current (AC) input voltage and generate a driver output current for driving the at least one LED from the AC input voltage. By using silicon carbide (SiC) for the switching components in the driver circuitry, the efficiency of the driver circuitry and thus the lighting fixture may be significantly increased, while simultaneously reducing the cost and complexity of the driver circuitry and thus the lighting fixture when compared to conventional lighting fixtures.Type: ApplicationFiled: August 25, 2014Publication date: February 25, 2016Inventors: Yuequan Hu, Nicholas William Medendorp, JR., Douglas E. Keiter
-
Publication number: 20160057825Abstract: Driver circuitry is coupled between a power supply and at least one LED in a solid-state lighting fixture, such that a non-isolated direct current (DC) path exists between the power supply and the at least one LED. The driver circuitry is configured to receive an AC input voltage and generate a driver output current for driving the at least one LED from the AC input voltage. By using driver circuitry that is non-isolated from the at least one LED in the solid-state lighting fixture, the efficiency of the driver circuitry may be increased, while simultaneously reducing the cost and complexity of the driver circuitry compared to conventional driver circuitry.Type: ApplicationFiled: August 25, 2014Publication date: February 25, 2016Inventors: Yuequan Hu, Nicholas William Medendorp, JR., Douglas E. Keiter
-
Publication number: 20140265922Abstract: A lighting apparatus includes at least one light emitting device and a reconfigurable driver circuit configured to drive the at least one light emitting device with an intensity that varies responsive to a dimming signal according to an adjustable mapping of the dimming signal to output of the light emitting device. In some embodiments, the mapping may be configurable using circuit component selection. In further embodiments, the mapping may be provided by a data input.Type: ApplicationFiled: March 14, 2013Publication date: September 18, 2014Applicant: Cree, Inc.Inventors: Michael Burbank Gilliom, Douglas E. Keiter, Danwei Liu, Michael Walters
-
Patent number: 7633173Abstract: A feedback control method and circuit for inclusion in a control system of an electrical power generating source that comprises a free piston Stirling engine driving a linear alternator. An instantaneous value of a variable, Vinternal, is continuously derived from other sensed and computed parameters and used in a negative feedback control loop of the control system to control engine piston stroke in order to maintain the power produced by the engine equal to the power transferred from the engine to the alternator. Vinternal is the sum of the voltage induced on the alternator winding and the voltage across the equivalent circuit lumped resistance of the alternator winding. A switching mode rectifier connects the alternator winding to an energy storage capacitor or battery. A negative feedback, alternator current control loop has an output connected to the pulse width modulator of the switching mode rectifier and has a feedback circuit comprising a current sensor for sensing instantaneous alternator current.Type: GrantFiled: August 20, 2008Date of Patent: December 15, 2009Assignee: Sunpower, Inc.Inventors: Douglas E. Keiter, Ezekiel S. Holliday
-
Publication number: 20080309095Abstract: A feedback control method and circuit for inclusion in a control system of an electrical power generating source that comprises a free piston Stirling engine driving a linear alternator. An instantaneous value of a variable, Vinternal, is continuously derived from other sensed and computed parameters and used in a negative feedback control loop of the control system to control engine piston stroke in order to maintain the power produced by the engine equal to the power transferred from the engine to the alternator. Vinternal is the sum of the voltage induced on the alternator winding and the voltage across the equivalent circuit lumped resistance of the alternator winding. A switching mode rectifier connects the alternator winding to an energy storage capacitor or battery. A negative feedback, alternator current control loop has an output connected to the pulse width modulator of the switching mode rectifier and has a feedback circuit comprising a current sensor for sensing instantaneous alternator current.Type: ApplicationFiled: August 20, 2008Publication date: December 18, 2008Applicant: Sunpower, Inc.,Inventors: Douglas E. Keiter, Ezekiel S. Holliday
-
Patent number: 7453241Abstract: A feedback control method and circuit for inclusion in a control system of an electrical power generating source that comprises a free piston Stirling engine driving a linear alternator. An instantaneous value of a variable, Vinternal, is continuously derived from other sensed and computed parameters and used in a negative feedback control loop of the control system to control engine piston stroke in order to maintain the power produced by the engine equal to the power transferred from the engine to the alternator. Vinternal is the sum of the voltage induced on the alternator winding and the voltage across the equivalent circuit lumped resistance of the alternator winding and a switching mode rectifier connects the alternator winding to an energy storage capacitor or battery.Type: GrantFiled: November 29, 2006Date of Patent: November 18, 2008Assignee: Sunpower, Inc.Inventors: Douglas E. Keiter, Ezekiel S. Holliday
-
Patent number: D812805Type: GrantFiled: June 13, 2016Date of Patent: March 13, 2018Assignee: Cree, Inc.Inventors: Andrew Bendtsen, Kurt Wilcox, Boris Karpichev, John Roberts, David Goelz, Douglas E. Keiter, Randy Bernard