Patents by Inventor Dragan Veskovic

Dragan Veskovic 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: 20090184840
    Abstract: A processing circuit for providing electronic photosensor information over a communication link. The processing circuit comprises a photosensor input circuit adapted to be directly coupled to a photosensor for receiving the electronic photosensor information from the photosensor. Further, a communication port is provided that allows for transmitting and receiving messages over the communication link. Moreover, a processor is provided that is coupled to the photosensor input circuit and the communication port. The processor determines whether the processor is operating in a default configuration, and broadcasts the electronic photosensor information on the communication link if the processor is operating in the default configuration.
    Type: Application
    Filed: March 31, 2009
    Publication date: July 23, 2009
    Applicant: Lutron Electronics Co., Inc.
    Inventors: Dragan Veskovic, Robert Anselmo, Audwin W. Cash, Matthew A. Skvoretz
  • Publication number: 20080315779
    Abstract: An electronic ballast for driving a gas discharge lamp includes a rectifier to convert an AC mains input voltage to a rectified voltage, a valley-fill circuit for producing a DC bus voltage, an inverter for converting the DC bus voltage to a high-frequency AC voltage for driving the lamp, a control circuit for controlling the inverter, and a flyback cat-ear power supply for supplying current to the inverter when the rectified voltage is less than a predetermined level. The flyback cat-ear power supply also provides power to the control circuit. Preferably, the flyback cat-ear power supply draws current only when the inverter is not drawing current directly from the AC mains, so as to make the input current to the ballast substantially sinusoidal. The result is a ballast having substantially improved power factor and THD.
    Type: Application
    Filed: July 8, 2008
    Publication date: December 25, 2008
    Applicant: LUTRON ELECTRONICS CO., INC.
    Inventors: Mark S. Taipale, Venkatesh Chitta, Dragan Veskovic
  • Publication number: 20080258551
    Abstract: A communication circuit for an electronic dimming ballast provides high-voltage miswire protection and improved rise and fall times of a transmitted digital signal. The electronic dimming ballast comprises a control circuit, which is coupled to a digital communication link, for example, a DALI communication link, via the communication circuit. The communication circuit comprises a receiving circuit for detecting when the digital ballast communication link is shorted and for providing a received digital message to the control circuit. The communication circuit also comprises a transmitting circuit for shorting the communication link in response to the control circuit. The communication circuit also includes a high-voltage fault protection circuit for protecting the circuitry of the communication circuit if the communication circuit high-voltage mains voltages. The communication circuit is operable to reliably transmit digital messages having improved rise and fall times.
    Type: Application
    Filed: April 18, 2007
    Publication date: October 23, 2008
    Inventors: Venkatesh Chitta, Elik Dvorkin, Dragan Veskovic
  • Patent number: 7432661
    Abstract: An electronic ballast for driving a gas discharge lamp includes a rectifier to convert an AC mains input voltage to a rectified voltage, a valley-fill circuit for producing a DC bus voltage, an inverter for converting the DC bus voltage to a high-frequency AC voltage for driving the lamp, a control circuit for controlling the inverter, and a flyback cat-ear power supply for supplying current to the inverter when the rectified voltage is less than a predetermined level. The flyback cat-ear power supply also provides power to the control circuit. Preferably, the flyback cat-ear power supply draws current only when the inverter is not drawing current directly from the AC mains, so as to make the input current to the ballast substantially sinusoidal. The result is a ballast having substantially improved power factor and THD.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: October 7, 2008
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Mark S. Taipale, Venkatesh Chitta, Dragan Veskovic
  • Publication number: 20080185977
    Abstract: A ballast for use in a multi-ballast lighting system wherein the ballasts are coupled together by a digital communication network. The ballast comprises a power circuit portion for providing an electrical current to power a lamp. The ballast further includes a sensor input circuit for receiving at least one sensor input from a sensor device, a processor receiving an input from the sensor input circuit and providing control signals to control the operation of the ballast, and a communication port coupled to the processor and to the communication network for exchanging data. The ballast processor is operative to receive a serial data that has a portion defining whether the message is in a first or a second format, the first format comprising a DALI standard format and the second format comprising a format providing extended functionality. The ballast processor is capable of processing messages in either the first or second formats.
    Type: Application
    Filed: April 1, 2008
    Publication date: August 7, 2008
    Applicant: LUTRON ELECTRONICS CO., INC.
    Inventors: Dragan Veskovic, Robert Anselmo, Audwin W. Cash, Matthew A. Skvoretz
  • Publication number: 20080180270
    Abstract: A ballast for use in a multi-ballast lighting system wherein the ballasts are coupled together by a digital communication network. The ballast comprises a power circuit portion for providing an electrical current to power a lamp. The ballast further includes a sensor input circuit for receiving at least one sensor input from a sensor device, a processor receiving an input from the sensor input circuit and providing control signals to control the operation of the ballast, and a communication port coupled to the processor and to the communication network for exchanging data. The ballast processor is operative to receive a serial data that has a portion defining whether the message is in a first or a second format, the first format comprising a DALI standard format and the second format comprising a format providing extended functionality. The ballast processor is capable of processing messages in either the first or second formats.
    Type: Application
    Filed: March 26, 2008
    Publication date: July 31, 2008
    Applicant: LUTRON ELECTRONICS CO., INC.
    Inventors: Dragan Veskovic, Robert Anselmo, Audwin W. Cash, Matthew A. Skvoretz
  • Patent number: 7391297
    Abstract: The invention regards a system and method for using a handheld programming device to configure a lighting control system wirelessly. In one embodiment, at least one device configured with a processing section is installed in the lighting control system. A communications receiver that is operable to receive a signal from the handheld programming device is also installed in the lighting control system, wherein the signal includes an instruction for configuring the lighting control system. Further, the signal is wirelessly sent from the handheld programming device to the communications receiver, and the instruction is transmitted from the communications receiver to a device in the system. The instruction functions to configure the lighting control system.
    Type: Grant
    Filed: March 13, 2006
    Date of Patent: June 24, 2008
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Audwin W. Cash, Rishi Raj Kumar, Christopher J. Rigatti, Dragan Veskovic, John Hewson
  • Patent number: 7369060
    Abstract: A ballast for use in a multi-ballast lighting system wherein the ballasts are coupled together by a digital communication network. The ballast comprises a power circuit portion for providing an electrical current to power a lamp. The ballast further includes a sensor input circuit for receiving at least one sensor input from a sensor device, a processor receiving an input from the sensor input circuit and providing control signals to control the operation of the ballast, and a communication port coupled to the processor and to the communication network for exchanging data. The ballast processor is operative to receive a serial data that has a portion defining whether the message is in a first or a second format, the first format comprising a DALI standard format and the second format comprising a format providing extended functionality. The ballast processor is capable of processing messages in either the first or second formats.
    Type: Grant
    Filed: December 14, 2004
    Date of Patent: May 6, 2008
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Dragan Veskovic, Robert Anselmo, Audwin W. Cash, Matthew A. Skvoretz
  • Publication number: 20080088180
    Abstract: A lighting control system is operable to control the amount of power delivered to a plurality of electrical loads. The lighting control system includes load control devices (such as digital electronic dimming ballasts), motorized window treatments, controllers, processors, and personal computers. The personal computer is preferably executing a graphical user interface (GUI) software, which allows a user to configure and monitor the operation of the lighting control system. The lighting control system offers a load shedding functionality without using power meters. Each load control device transmits its current intensity level to the personal computer, which is operable to determine a total power consumption of the lighting control system. If the total power consumption exceeds a predetermined power threshold, the personal computer causes the load control devices to shed loads.
    Type: Application
    Filed: October 11, 2007
    Publication date: April 17, 2008
    Inventors: Audwin W. Cash, William H. Howe, Joe Suresh Jacob, Timothy S. Majewski, Christopher J. Rigatti, Dragan Veskovic
  • Publication number: 20080088181
    Abstract: The invention regards a system and method for using a handheld programming device to configure a lighting control system wirelessly. In one embodiment, at least one device configured with a processing section is installed in the lighting control system. A communications receiver that is operable to receive a signal from the handheld programming device is also installed in the lighting control system, wherein the signal includes an instruction for configuring the lighting control system. Further, the signal is wirelessly sent from the handheld programming device to the communications receiver, and the instruction is transmitted from the communications receiver to a device in the system. The instruction functions to configure the lighting control system.
    Type: Application
    Filed: November 30, 2007
    Publication date: April 17, 2008
    Applicant: LUTRON ELECTRONICS CO., INC.
    Inventors: Audwin Cash, Rishi Raj Kumar, Christopher Rigatti, Dragan Veskovic, John Hewson
  • Publication number: 20080088435
    Abstract: The invention regards a system and method for using a handheld programming device to configure a lighting control system wirelessly. In one embodiment, at least one device configured with a processing section is installed in the lighting control system. A communications receiver that is operable to receive a signal from the handheld programming device is also installed in the lighting control system, wherein the signal includes an instruction for configuring the lighting control system. Further, the signal is wirelessly sent from the handheld programming device to the communications receiver, and the instruction is transmitted from the communications receiver to a device in the system. The instruction functions to configure the lighting control system.
    Type: Application
    Filed: November 30, 2007
    Publication date: April 17, 2008
    Applicant: LUTRON ELECTRONICS CO., INC.
    Inventors: Audwin Cash, Rishi Raj Kumar, Christopher Rigatti, Dragan Veskovic, John Hewson
  • Publication number: 20080084270
    Abstract: The invention regards a system and method for using a handheld programming device to configure a lighting control system wirelessly. In one embodiment, at least one device configured with a processing section is installed in the lighting control system. A communications receiver that is operable to receive a signal from the handheld programming device is also installed in the lighting control system, wherein the signal includes an instruction for configuring the lighting control system. Further, the signal is wirelessly sent from the handheld programming device to the communications receiver, and the instruction is transmitted from the communications receiver to a device in the system. The instruction functions to configure the lighting control system.
    Type: Application
    Filed: November 30, 2007
    Publication date: April 10, 2008
    Applicant: LUTRON ELECTRONICS CO., INC.
    Inventors: Audwin Cash, Rishi Raj Kumar, Christopher Rigatti, Dragan Veskovic, John Hewson
  • Publication number: 20070211446
    Abstract: An illumination maintenance system for maintaining a desired illumination profile in a space throughout at least a portion of a day, the space being illuminable by both daylight and electric light, the system comprising a sensor for sensing an illumination level in at least a portion of the space; a plurality of dimmable electric lamps providing the electric light to supplement the daylight illumination of the space, the electric lamps arranged in one or more zones in the space, the zones defining predefined volumes of the space, each zone having at least one lamp; a control system controlling the dimming levels of the plurality of electric lamps, the at least one lamp of each zone being controlled to a dimming level to achieve a desired illumination level in the respective zone according to the desired illumination profile and compensate for the daylight illumination in the space throughout at least the portion of the day; wherein the dimming level of each lamp is selected by the control system from one of a
    Type: Application
    Filed: September 8, 2006
    Publication date: September 13, 2007
    Applicant: LUTRON ELECTRONICS CO., INC.
    Inventor: Dragan Veskovic
  • Publication number: 20070211447
    Abstract: A system for reducing sun glare through an opening into a space, the system comprising an electrically controllable window treatment operable to alter the amount of daylight entering the space through the opening; a first sensor mounted within the space and characterized by a sensor gain, the first sensor operable to sense a level of illumination in the space; and a control system operable: to compare the sensed illumination level in the space to a dead-band having upper and lower thresholds; to adjust during a time period when glare from the sun can occur through the opening at least one of: (a) the upper threshold of the dead-band, (b) the lower threshold of the dead-band, and (c) the sensor gain of the first sensor; and to adjust the window treatment in response to the sensed level of illumination to reduce the sun glare.
    Type: Application
    Filed: September 8, 2006
    Publication date: September 13, 2007
    Applicant: LUTRON ELECTRONICS CO., INC.
    Inventor: Dragan Veskovic
  • Publication number: 20070132401
    Abstract: An electronic dimming ballast comprises a filament turn-off circuit for controlling the magnitudes of filament voltages supplied to the filaments of a gas discharge lamp. Each of a plurality of filament windings is directly coupled to one of the filaments and is operable to supply a small AC filament voltage to the filaments. The plurality of filament windings and a control winding are loosely magnetically coupled to a resonant inductor of an output circuit of the ballast. A controllably conductive device is coupled across the control winding. When the controllably conductive device is conductive, the voltage across the control winding and the filament windings falls to zero volts. The controllably conductive device is driven with a pulse-width modulated (PWM) signal so as to control the magnitudes of the filament voltages. The filament voltages are provided to the filaments before striking the lamp, and when dimming the lamp near low end.
    Type: Application
    Filed: July 21, 2006
    Publication date: June 14, 2007
    Inventors: Brent Gawrys, Jecko Arakkal, Mark Taipale, Dragan Veskovic, Mark Fisher
  • Patent number: 7208887
    Abstract: A ballast for a gas discharge lamp comprising a first circuit portion for providing power to a lighting load and a second circuit portion for processing data exchanged with a communication link, the first circuit portion receiving power from an AC main supply for conversion to a form suitable to supply power to the lamp, and the second circuit portion having a power supply supplied from the AC main supply, the power supply being coupled at the input of the AC main supply to the first circuit portion, further comprising a first protection circuit coupled in series with the AC main supply for protecting the first and second circuit portions in the event of an electrical circuit failure leading to an overcurrent condition, the power supply for the second circuit portion being coupled such that it is protected by the first protection circuit; further comprising a second protection circuit disposed in series with the first circuit portion and providing protection only in the event of electrical failure leading to
    Type: Grant
    Filed: December 14, 2004
    Date of Patent: April 24, 2007
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Donald R. Mosebrook, Dragan Veskovic
  • Publication number: 20060244395
    Abstract: An electronic ballast for driving a plurality of gas discharge lamps in parallel includes a rectifier to convert an AC mains input voltage to a rectified voltage, a filter circuit to convert the rectified voltage to a substantially DC bus voltage, an inverter to convert the DC bus voltage to a high-frequency AC voltage for driving the lamp, and an output stage for coupling the high-frequency AC voltage to the lamps. The ballast also includes a plurality of balancing transformers coupled to the lamps for balancing the currents in the lamps. When one of the parallel lamps is missing or faulty, a substantially large voltage is produced across one or more of the balancing transformers. This large voltage is detected by a missing-lamp detect circuit that provides a control signal to a ballast control circuit. In response to a detected missing-lamp condition, the control circuit stops the ballast from driving the lamps.
    Type: Application
    Filed: May 2, 2005
    Publication date: November 2, 2006
    Inventors: Mark Taipale, Venkatesh Chitta, Dragan Veskovic
  • Publication number: 20060244392
    Abstract: An electronic ballast for driving a gas discharge lamp includes a rectifier to convert an AC mains input voltage to a rectified voltage, a valley-fill circuit for producing a DC bus voltage, an inverter for converting the DC bus voltage to a high-frequency AC voltage for driving the lamp, a control circuit for controlling the inverter, and a flyback cat-ear power supply for supplying current to the inverter when the rectified voltage is less than a predetermined level. The flyback cat-ear power supply also provides power to the control circuit. Preferably, the flyback cat-ear power supply draws current only when the inverter is not drawing current directly from the AC mains, so as to make the input current to the ballast substantially sinusoidal. The result is a ballast having substantially improved power factor and THD.
    Type: Application
    Filed: May 2, 2005
    Publication date: November 2, 2006
    Inventors: Mark Taipale, Venkatesh Chitta, Dragan Veskovic
  • Patent number: 7111952
    Abstract: An illumination maintenance system for maintaining a desired illumination profile in a space throughout at least a portion of a day where the illumination sources include daylight and artificial light, the system comprising a first sensor for sensing an illumination level in at least a portion of the space, at least one window treatment for at least one opening for allowing daylight into the space, the window treatment selectively altering the amount of daylight entering the space, a plurality of electric lamps providing artificial light to supplement the daylight illumination of the space; the electric lamps being dimmable, a control system controlling the at least one window treatment and the plurality of electric lamps to maintain the desired illumination profile in the space, the control system controlling the plurality of electric lamps so that the dimming level of each lamp is adjusted to achieve the desired lighting profile and compensate for the daylight illumination in the space throughout at least t
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: September 26, 2006
    Assignee: Lutron Electronics Co., Inc.
    Inventor: Dragan Veskovic
  • Publication number: 20060202851
    Abstract: The invention regards a system and method for using a handheld programming device to configure a lighting control system wirelessly. In one embodiment, at least one device configured with a processing section is installed in the lighting control system. A communications receiver that is operable to receive a signal from the handheld programming device is also installed in the lighting control system, wherein the signal includes an instruction for configuring the lighting control system. Further, the signal is wirelessly sent from the handheld programming device to the communications receiver, and the instruction is transmitted from the communications receiver to a device in the system. The instruction functions to configure the lighting control system.
    Type: Application
    Filed: March 13, 2006
    Publication date: September 14, 2006
    Inventors: Audwin Cash, Rishi Kumar, Christopher Rigatti, Dragan Veskovic, John Hewson