Patents by Inventor Russell L. MacAdam

Russell L. MacAdam 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).

  • Publication number: 20140239836
    Abstract: An electronic dimming ballast or light emitting diode (LED) driver for driving a gas discharge lamp or LED lamp may be operable to control the lamp to avoid flickering and flashing of the lamp during low temperature or low mercury conditions. Such a ballast or driver may include a control circuit that is operable to adjust the intensity of the lamp. Adjusting the intensity of the lamp may include decreasing the intensity of the lamp. The control circuit may be operable to stop adjustment of the intensity of the lamp if a magnitude of the lamp voltage across the lamp is greater than an upper threshold, and subsequently begin to adjust the intensity of the lamp when the lamp voltage across the lamp is less than a lower threshold. Subsequently beginning to adjust the intensity of the lamp may include subsequently decreasing the intensity of the lamp.
    Type: Application
    Filed: February 26, 2013
    Publication date: August 28, 2014
    Applicant: LUTRON ELECTRONICS CO., INC.
    Inventors: Venkatesh Chitta, Russell L. MacAdam
  • Patent number: 7880405
    Abstract: The invention includes an electronic ballast that is operable to receive a ballast factor setting that enables the ballast to provide a desired ballast factor when the ballast drives a lamp. The electronic ballast includes an input that is adapted to receive a ballast factor setting that represents a desired ballast factor for the ballast and a respective lamp. The ballast further includes a memory that is adapted to store the ballast factor setting, and the ballast includes a processor that uses the ballast factor setting stored in the memory to cause the ballast to provide the desired ballast factor as the ballast drives the lamp. The ballast includes means for substantially preventing subsequently changing the ballast factor setting stored in the memory. Various business methods are further provided as a function of the electronic ballast.
    Type: Grant
    Filed: April 9, 2007
    Date of Patent: February 1, 2011
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Venkatesh Chitta, Russell L. MacAdam, Kenneth D. Walma, Jr.
  • Publication number: 20080246415
    Abstract: The invention includes an electronic ballast that is operable to receive a ballast factor setting that enables the ballast to provide a desired ballast factor when the ballast drives a lamp. The electronic ballast includes an input that is adapted to receive a ballast factor setting that represents a desired ballast factor for the ballast and a respective lamp. The ballast further includes a memory that is adapted to store the ballast factor setting, and the ballast includes a processor that uses the ballast factor setting stored in the memory to cause the ballast to provide the desired ballast factor as the ballast drives the lamp. The ballast includes means for substantially preventing subsequently changing the ballast factor setting stored in the memory. Various business methods are further provided as a function of the electronic ballast.
    Type: Application
    Filed: April 9, 2007
    Publication date: October 9, 2008
    Inventors: Venkatesh Chitta, Russell L. MacAdam, Kenneth D. Walma
  • Patent number: 6794830
    Abstract: A plurality of spaced ceiling mounted fixtures or other controllable electrical appliances have radiation detectors mounted within each fixture and wired internally of the fixture to a dimming circuit or to a ballast. The radiation detectors have sensitivity over a wide angle and have elongated plastic radiation conduction rods which extend to or beyond the plane of the lens of the fixture to be located free of shadow effects of reflections of the fixture lens. A flexible end light fiber optics can be used in place of the acrylic rods. A narrow beam radiation transmitter selectively illuminates one of the rods or end light fiber optics without illuminating the others. The dimming circuits or ballasts within the fixtures can be further controlled by external dimmers, occupancy sensors, timeclocks, photosensors and other types of input devices. The radiation detector and ballast can occupy a common housing and share the same power supply and circuit board.
    Type: Grant
    Filed: December 5, 2003
    Date of Patent: September 21, 2004
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Adam T. Lansing, Russell L. MacAdam, Noel Mayo, Scott C. Miller, Robert A. Reiss, Ian Rowbottom, Joel S. Spira
  • Publication number: 20040119415
    Abstract: A plurality of spaced ceiling mounted fixtures or other controllable electrical appliances have radiation detectors mounted within each fixture and wired internally of the fixture to a dimming circuit or to a ballast. The radiation detectors have sensitivity over a wide angle and have elongated plastic radiation conduction rods which extend to or beyond the plane of the lens of the fixture to be located free of shadow effects of reflections of the fixture lens. A flexible end light fiber optics can be used in place of the acrylic rods. A narrow beam radiation transmitter selectively illuminates one of the rods or end light fiber optics without illuminating the others. The dimming circuits or ballasts within the fixtures can be further controlled by external dimmers, occupancy sensors, timeclocks, photosensors and other types of input devices. The radiation detector and ballast can occupy a common housing and share the same power supply and circuit board.
    Type: Application
    Filed: December 5, 2003
    Publication date: June 24, 2004
    Applicant: Lutron Electronics Co., Inc.
    Inventors: Adam T. Lansing, Russell L. MacAdam, Noel Mayo, Scott C. Miller, Robert A. Reiss, Iar Rowbottom, Joel S. Spira
  • Patent number: 6667578
    Abstract: A plurality of spaced ceiling mounted fixtures or other controllable electrical appliances have radiation detectors mounted within each fixture and wired internally of the fixture to a dimming circuit or to a ballast. The radiation detectors have sensitivity over a wide angle and have elongated plastic radiation conduction rods which extend to or beyond the plane of the lens of the fixture to be located free of shadow effects of reflections of the fixture lens. A flexible end light fiber optics can be used in place of the acrylic rods. A narrow beam radiation transmitter selectively illuminates one of the rods or end light fiber optics without illuminating the others. The dimming circuits or ballasts within the fixtures can be further controlled by external dimmers, occupancy sensors, timeclocks, photosensors and other types of input devices. The radiation detector and ballast can occupy a common housing and share the same power supply and circuit board.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: December 23, 2003
    Assignee: Lutron Electronics, Co., Inc.
    Inventors: Adam T. Lansing, Russell L. MacAdam, Noel Mayo, Scott C. Miller, Robert A. Reiss, Ian Rowbottom, Joel S. Spira
  • Patent number: 6642669
    Abstract: The operating frequency of a ballast is sufficiently far from resonance that, when a compact fluorescent lamp is dimmed to about one percent light output level, the ballast is operating with an open loop gain below a predetermined level, such as, for example, 15, and is operating with an output impedance greater than a predetermined level, such as, for example, the absolute value of the maximum negative incremental impedance of the lamp, and more preferably, greater than twice the absolute value of the maximum negative incremental impedance of the lamp. By changing the frequency to 85 kHz from 80 kHz, for example, the gain is maintained about the same whether the light output is at five percent or one percent, for example. This provides a stable control loop. In this manner, compact fluorescent lamps can be dimmed below about one percent light output, without dropping out and without observable flicker.
    Type: Grant
    Filed: June 1, 2002
    Date of Patent: November 4, 2003
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Russell L. MacAdam, Andrew Ryan Offenbacher, Jecko J. Arakkal
  • Patent number: 6452344
    Abstract: An electronic dimming ballast has a parallel loaded resonant output circuit plus a combination of pulse width modulation and frequency variation to accomplish the dimming of compact fluorescent lamps. The ballast operates at a fixed frequency throughout a selected range of light levels, with dimming control being done completely by duty cycle variation over this range of operation, and then smoothly moves to a variable frequency as the light output moves outside the selected range, with both duty cycle and frequency variation being the means of lamp light output control outside the selected range.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: September 17, 2002
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Russell L. MacAdam, Mark S. Taipale, Oliver K. Mihm, David G. Luchaco, Jason C. Killo, Kolawole A. Otitoju
  • Publication number: 20010040805
    Abstract: A plurality of spaced ceiling mounted fixtures or other controllable electrical appliances have radiation detectors mounted within each fixture and wired internally of the fixture to a dimming circuit or to a ballast. The radiation detectors have sensitivity over a wide angle and have elongated plastic radiation conduction rods which extend to or beyond the plane of the lens of the fixture to be located free of shadow effects of reflections of the fixture lens. A flexible end light fiber optics can be used in place of the acrylic rods. A narrow beam radiation transmitter selectively illuminates one of the rods or end light fiber optics without illuminating the others. The dimming circuits or ballasts within the fixtures can be further controlled by external dimmers, occupancy sensors, timeclocks, photosensors and other types of input devices. The radiation detector and ballast can occupy a common housing and share the same power supply and circuit board.
    Type: Application
    Filed: April 18, 2001
    Publication date: November 15, 2001
    Applicant: Lutron Electronics, Co., Inc.
    Inventors: Adam T. Lansing, Russell L. MacAdam, Noel Mayo, Scott C. Miller, Robert A. Reiss, Ian Rowbottom, Joel S. Spira
  • Patent number: 6310440
    Abstract: A plurality of spaced ceiling mounted fixtures or other controllable electrical appliances have radiation detectors mounted within each fixture and wired internally of the fixture to a dimming circuit or to a ballast. The radiation detectors have sensitivity over a wide angle and have elongated plastic radiation conduction rods which extend to or beyond the plane of the lens of the fixture to be located free of shadow effects of reflections of the fixture lens. A flexible end light fiber optics can be used in place of the acrylic rods. A narrow beam radiation transmitter selectively illuminates one of the rods or end light fiber optics without illuminating the others. The dimming circuits or ballasts within the fixtures can be further controlled by external dimmers, occupancy sensors, timeclocks, photosensors and other types of input devices. The radiation detector and ballast can occupy a common housing and share the same power supply and circuit board.
    Type: Grant
    Filed: January 7, 2000
    Date of Patent: October 30, 2001
    Assignee: Lutron Electronics Company, Inc.
    Inventors: Adam T. Lansing, Russell L. MacAdam, Noel Mayo, Scott C. Miller, Robert A. Reiss, Ian Rowbottom, Joel S. Spira
  • Patent number: 6037721
    Abstract: A plurality of spaced ceiling mounted fixtures or other controllable electrical appliances have radiation detectors mounted within each fixture and wired internally of the fixture to a dimming circuit or to a ballast. The radiation detectors have sensitivity over a wide angle and have elongated plastic radiation conduction rods which extend to or beyond the plane of the lens of the fixture to be located free of shadow effects of reflections of the fixture lens. A flexible end light fiber optics can be used in place of the acrylic rods. A narrow beam radiation transmitter selectively illuminates one of the rods or end light fiber optics without illuminating the others. The dimming circuits or ballasts within the fixtures can be further controlled by external dimmers, occupancy sensors, timeclocks, photosensors and other types of input devices. The radiation detector and ballast can occupy a common housing and share the same power supply and circuit board.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: March 14, 2000
    Assignee: Lutron Electronics, Co., Inc.
    Inventors: Adam T. Lansing, Russell L. MacAdam, Noel Mayo, Scott C. Miller, Robert A. Reiss, Ian Rowbottom, Joel S. Spira
  • Patent number: 5637964
    Abstract: A plurality of spaced ceiling mounted fixtures or other controllable electrical appliances have wide angle radiation detectors mounted within each fixture and wired internally of the fixture to a dimming circuit or to a ballast. The radiation detectors have sensitivity over a wide angle and are fixed over a small opening in the fixture. A narrow beam radiation transmitter selectively illuminates one of the radiation detectors without illuminating the others. The dimming circuits or ballasts within the fixtures can be further controlled by external dimmers, occupancy sensors, timeclocks, photosensors and other types of input devices.
    Type: Grant
    Filed: March 21, 1995
    Date of Patent: June 10, 1997
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Simo P. Hakkarainen, Russell L. MacAdam, Scott C. Miller, Ian Rowbottom, Joel S. Spira