Patents by Inventor Winston Donald Couwenberg

Winston Donald Couwenberg 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: 20090129134
    Abstract: Converting a direct (DC) input voltage supplied by a DC source (2) to an alternating (AC) output voltage, comprising supplying the DC input voltage through an inductor (8) to a series connection of a resonant circuit (10, 12, 16, 18) and a load (6), switching the voltage supplied to the series connection, resonant circuit (10, 12, 16, 18) and load (6) alternately on and off, wherein the input voltage is controlled to constitute a DC voltage with a controlled magnitude, in particular by arranging a DC-DC buck converter, which is connected to the DC source (2) and which comprises a second switch (22) and a freewheeling diode (24), the latter being connected parallel to the series connection of the inductor (8), the resonant circuit (10, 12, 16, 18) and the load (6).
    Type: Application
    Filed: September 7, 2006
    Publication date: May 21, 2009
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: PATRICK JOHN ZIJLSTRA, WINSTON DONALD COUWENBERG, RENE VAN HONSCHOOTEN
  • Publication number: 20080284355
    Abstract: To avoid acoustic resonance in a gas discharge lamp, a lamp current constituted of a number of frequencies is supplied to said lamp. Using a number of frequencies, the total power supplied to the lamp is distributed over said number of frequencies. Since the power per frequency is relatively low, the possibility of occurrence of an acoustic resonance is low irrespective of the characteristics of the gas discharge lamp. The current may comprise a number of frequencies by applying a number of sinusoidal currents or by using a non-sinusoidal current.
    Type: Application
    Filed: June 9, 2005
    Publication date: November 20, 2008
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: Ronald Hans Van Der Voort, Winston Donald Couwenberg
  • Publication number: 20080231206
    Abstract: Method of driving a high-pressure gas discharge lamp during its steady-state operation, wherein a steady-state current signal is sent through the lamp for maintaining a discharge arc in the lamp, comprising the step of comparing the lamp conductivity response to a current step in said current signal with reference parameters; and in response to said comparison at least one of the following steps: stopping the current supply to the lamp, generating a signal indicating the end-of-life status of the lamp, changing the steady-state current through the lamp, changing the steady-state waveform of the current signal through the lamp, and generating a signal indicating the lamp type, wherein said current step is obtained by sending a current pulse which is superimposed on said steady-state current signal through the lamp.
    Type: Application
    Filed: January 18, 2005
    Publication date: September 25, 2008
    Applicant: KONINKLIJKE PHILIPS ELECTRONIC, N.V.
    Inventors: Winston Donald Couwenberg, Robertus Antonius Johannes Keijser, Jacobus Marinus Maria Claassens, Bennie Izaak Pieter Simpelaar
  • Patent number: 7339326
    Abstract: An DC/AC converter for supplying two gas discharge lamps, includes a double bridge configuration of four switches and a controller. The controller controls the conducting periods of the switches with a duty cycle which is variable. By control of the conducting periods of the switches, a proper control of the energy supplied to the lamps is obtained.
    Type: Grant
    Filed: December 2, 2003
    Date of Patent: March 4, 2008
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Winston Donald Couwenberg, Dolf Henricus Jozef Van Casteren
  • Patent number: 7329009
    Abstract: A projection system for image reproduction includes at least one lamp and sensor for generating a sensor signal for monitoring changes in the luminous flux generated by the lamp and for compensating these changes through a suitable control of the image reproduction. The projection system further includes a device for eliminating substantially periodic interference components from the sensor signal generated by the sensor. These interference components may be generated by an optical component such as a color modulator of the projection system. The projection system provides substantially interference-free compensation of fluctuations in the luminous flux generated by the lamp, for example, owing to an unstable arc discharge. Further, the positioning of the sensor in the projection system may not be critical.
    Type: Grant
    Filed: September 18, 2003
    Date of Patent: February 12, 2008
    Assignee: Koninklijke Philips Electronics, N.V.
    Inventors: Holger Mönch, Peter Lürkens, Carsten Deppe, Winston Donald Couwenberg, Johannis Antonie Toonen, Roy Hendrik Zundert
  • Patent number: 7164241
    Abstract: A method for driving a gas discharge lamp (1) is described, wherein electric first DC power is provided at a relatively high voltage and a relatively low current. Said first power is converted down to second DC power at a relatively low voltage and a relatively high current. Said second power is fed to a gas discharge lamp, preferably via a commutator. The conversion of said first power to said second power is performed in at least two steps, a first one of such steps including the step of converting down said first power to an intermediate DC power at an intermediate DC voltage lower (VM) than said first DC voltage but higher than said second DC voltage. A downconverter device (30) for use in a driving apparatus (10) for a gas discharge lamp (1) is described. The downconverter device comprises at least two downconverter units (31, 32) connected in series, for converting down said intermediate DC power to said second power.
    Type: Grant
    Filed: October 11, 2002
    Date of Patent: January 16, 2007
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Winston Donald Couwenberg, Wilhelmus Hinderikus Maria Langeslag, Ludovicus Franciscus Johanes Oostvogels, Johannis Antonie Amerens Toonen
  • Patent number: 7154228
    Abstract: In a ballast circuit for supplying a high pressure discharge lamp and comprising an up-converter and a bridge circuit, the output voltage of the up-converter is controlled at a higher level immediately after the ignition of the lamp and at a lower level during stationary operation. Stabilization of the discharge immediately after ignition of the lamp and a relatively small power dissipation are both realized in this ballast circuit.
    Type: Grant
    Filed: February 7, 2003
    Date of Patent: December 26, 2006
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Dolf Henricus Jozef Van Casteren, Winston Donald Couwenberg
  • Publication number: 20040245945
    Abstract: A method for driving a gas discharge lamp (1) is described, wherein electric first DC power is provided at a relatively high voltage and a relatively low current. Said first power is converted down to second DC power at a relatively low voltage and a relatively high current. Said second power is fed to a gas discharge lamp, preferably via a commutator. The conversion of said first power to said second power is performed in at least two steps, a first one of such steps including the step of converting down said first power to an intermediate DC power at an intermediate DC voltage lower (VM) than said first DC voltage but higher than said second DC voltage. A downconverter device (30) for use in a driving apparatus (10) for a gas discharge lamp (1) is described. The downconverter device comprises at least two downconverter units (31, 32) connected in series, for converting down said intermediate DC power to said second power.
    Type: Application
    Filed: April 7, 2004
    Publication date: December 9, 2004
    Inventors: Winston Donald Couwenberg, Wilhelmus Hinderikus Maria Langeslag, Ludovicus Oostvogels, Johannis Toonen