Patents Assigned to Patent-Treuhand-Gesellschaft fuer Elektrische Gluehlampen mbH
  • Rectifier circuit suited to power factor correction
    Patent number: 6778373
    Abstract: A rectifier circuit matched for power factor correction. A first diode (D1), a second diode (D2), a third diode (D3) and a fourth diode (D4) are in a bridge arrangement. A first pole (10) and a second pole (12) of the bridge arrangement are connected to a source (U) which has at least one AC voltage component. An inductance (L1) is arranged in series with the third pole (14) or the fourth pole (16) of the bridge arrangement. A capacitance (C1) is connected between the first pole (10) and the second pole (12), and two of the four diodes (D1, D2, D3, D4) are in the form of fast diodes.
    Type: Grant
    Filed: March 7, 2002
    Date of Patent: August 17, 2004
    Assignee: Patent-Treuhand-Gesellschaft für Elektrische Glühlampen mbH
    Inventors: Ugo Francescutti, Felix Franck
  • Operating device for gas discharge lamps with detection of filament breakage
    Patent number: 6777942
    Abstract: Disconnection device for an electronic operating device for gas discharge lamps. The filament breakage of a lamp is evaluated by detecting the current through a component which flows through the filaments. This is performed either by detecting this current with the aid of an optocoupler or by measuring the phase of the load circuit current.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: August 17, 2004
    Assignee: Patent-Treuhand-Gesellschaft fuer Elektrische Gluehlampen mbH
    Inventor: Klaus Schadhauser
  • Ballast and method for operating a lamp
    Patent number: 6768271
    Abstract: The invention relates to a ballast for a lamp having an inverter which includes at least one switch (S1; S2), and having a drive circuit (10) for alternately opening and closing the at least one switch (S1; S2) wherein the drive circuit (10) is designed to drive the at least one switch (S1; S2) alternately at at least two different frequencies (&ohgr;a, &ohgr;b). It also relates to a method for operating a ballast for a lamp having an inverter which comprises at least one switch (S1; S2), and having a drive circuit (10) for alternately opening and closing the at least one switch (S1; S2) wherein the drive circuit drives the at least one switch (S1; S2) alternately at at least two different frequencies (&ohgr;a, &ohgr;b).
    Type: Grant
    Filed: January 2, 2003
    Date of Patent: July 27, 2004
    Assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH
    Inventors: Olaf Busse, Markus Heckmann, Wolfram Sowa
  • Discharge lamp for dielectrically impeded discharges with a arrangement of support elements
    Patent number: 6762549
    Abstract: In the case of a quiet discharge lamp, support elements for supporting a top plate are provided, by comparison with a base plate, in larger numbers and in an alternating arrangement with individual discharge structures.
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: July 13, 2004
    Assignee: Patent-Treuhand-Gesellschaft fuer Elektrische Gluehlampen mbH
    Inventors: Lothar Hitzschke, Frank Vollkommer
  • Operating circuit for a discharge lamp with frequency-variable ignition
    Patent number: 6759813
    Abstract: A novel operating circuit for a low-pressure gas discharge lamp 1 in the case of which a digital controller 12 is designed such that by gradually lowering the operating frequency in the ignition procedure it initiates shutdown operations of a safety shutdown device for excessive currents through a lamp inductor 10 in order thereafter to increase the operating frequency somewhat. It is possible overall in this way to achieve an ignition, for example by repeated pulsed ignition operations as far as shutdown operations, or else by a continuous ignition operation at a minimum frequency at which no shutdown operation occurs. The invention has the advantage of being insensitive to temperature fluctuations and component tolerances and, moreover, of permitting the lamp inductor 10 to have comparatively small dimensions.
    Type: Grant
    Filed: February 6, 2003
    Date of Patent: July 6, 2004
    Assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH
    Inventors: Olaf Busse, Klaus Orth
  • Illumination device with at least one LED as light source
    Patent number: 6759804
    Abstract: Illumination device with at least one LED as light source, the LED emitting primary radiation in the range from 380 to 420 nm, this radiation being partially or completely converted into longer-wave radiation by phosphors which are exposed to the primary radiation from the LED, the conversion taking place at least with the aid of a phosphor which emits over a broad band and originates from the class of the (Eu,Mn)-coactivated halophosphates, the cation M representing one of the metals Sr, Ca, Ba.
    Type: Grant
    Filed: September 12, 2002
    Date of Patent: July 6, 2004
    Assignee: Patent-Treuhand-Gesellschaft für Elektrische Glühlampen mbH
    Inventors: Andries Ellens, Günter Huber, Robert Mc Sweeney
  • Operating device for discharge lamps having a preheating device
    Patent number: 6753659
    Abstract: An operating circuit for a discharge lamp (LP) having preheatable electrodes includes a device (C14, T11, T12, T13, G) for preheating the electrodes. The device includes a resonant circuit (C14, T11) which oscillates during preheating. During operation, the operating circuit produces an AC voltage having a frequency that is moved through a frequency range, records the response of the resonant circuit (C14, T11) by measuring an electrical variable (UC14), and identifies the resonant frequency of the resonant circuit (C14, T11) from the electrical variable (UC14), and preheats the electrodes by setting the frequency of the AC voltage to the resonant frequency.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: June 22, 2004
    Assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH
    Inventors: Olaf Busse, Bernhard Schemmel, Michael Weirich
  • Device and method for preheating the coil electrodes of a fluorescent lamp
    Patent number: 6747418
    Abstract: The present invention relates to a device for preheating the two coil electrodes (W1, W2) of a fluorescent lamp (La) comprising an AC voltage source (10), a resonance capacitor CR, which is arranged serially between the two coil electrodes (W1, W2), a first inductance (L1), which is coupled between the AC voltage source (10) and one of the two coil electrodes (W1, W2), and a second inductance (L2), which is connected to a point between the AC voltage source (10) and the coil electrode (W1) coupled thereto, the second inductance (L2) being coupled to the first inductance (L1) in such a way that a current flow (IL2) through the second inductance (L2) leads to a reduction of the magnetization of the first inductance (L1). It furthermore relates to a corresponding method.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: June 8, 2004
    Assignee: Patent-Treuhand-Gesellschaft fuer elektrische Gluehlampen mbH
    Inventor: Wolfram Sowa
  • Operating circuit for a discharge lamp with preheatable electrodes
    Patent number: 6744219
    Abstract: The invention relates to a novel operating circuit for a discharge lamp, in the case of which the lamp electrodes are preheated by driving switching transistors of an oscillator circuit such that their frequencies are detuned with reference to the resonant frequency of the lamp circuit. The drive frequency is defined by an independent resonant circuit.
    Type: Grant
    Filed: August 27, 2002
    Date of Patent: June 1, 2004
    Assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH
    Inventor: Thomas Neidlinger
  • Free-running circuit arrangement
    Patent number: 6744220
    Abstract: A free-running circuit arrangement for operating a load, has at least one switching element, a freewheeling diode connected in an anti-parallel fashion relative to the main current direction of the at least one switching element, a load circuit and a control resonant circuit which comprises at least one control inductor and at least one self-capacitance of the at least one switching element. The at least one switching element has a control electrode, a working electrode and a reference electrode, a capacitance acting between the control and working electrodes that is coupled to the control resonant circuit such that energy is fed into the control resonant circuit by the charging and discharging current of this capacitance, the circuit arrangement having no components for feeding energy into the control resonant circuit by electromagnetic coupling.
    Type: Grant
    Filed: August 1, 2002
    Date of Patent: June 1, 2004
    Assignee: Patent-Treuhand-Gesellschaft für Elektrische Glühlampen mbH
    Inventor: Thomas Neidlinger
  • Flat fluorescent light comprising a contact system
    Patent number: 6743036
    Abstract: A flat fluorescent light (1), comprises a discharge vessel that is composed of a based plate (3), face plate (4) and frame (5). A contact system (2) for connecting an electric power supply device by connection lines is integrated into the narrow side of the flat fluorescent light. An insulation body, provided with U-shaped contact sections is located between a section of the base plate (3) and face plate (4), the section acting as a receptacle and projecting beyond the frame (5) of the discharge vessel. The contact surface of the contact sections are connected to the electrodes of the flat florescent light by connection surfaces of the receptacle. The connection parts of the contact sections are connected to the connection lines.
    Type: Grant
    Filed: October 29, 2002
    Date of Patent: June 1, 2004
    Assignee: Patent-Treuhand-Gesellschaft fuer Elektrische Gluehlampen mbH
    Inventors: Friedrich Lauter, Matthias Schweizer
  • Operating device for lamps with a regulated SEPIC converter
    Patent number: 6741040
    Abstract: The invention relates to a novel operating device for lamps, in particular low-pressure gas discharge lamps, in which a SEPIC converter is used for charging a storage transistor from an AC voltage supply. In this case, the SEPIC converter is regulated to an output quantity as regulated variable, its operating frequency being altered. Preferably, only the switch-on time and not the switch-off time of the switching transistor of the SEPIC converter is altered in this case.
    Type: Grant
    Filed: February 19, 2003
    Date of Patent: May 25, 2004
    Assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH
    Inventor: Michael Weirich
  • Discharge vessel with excimer fill, and associated discharge lamp
    Patent number: 6734629
    Abstract: A discharge vessel with an excimer fill comprises a cap, electrodes and a fill having at least one noble gas and a halogen, which, when the lamp is operating, together form an excimer, the discharge vessel being manufactured from quartz glass. The inner wall of the discharge vessel is completely covered with a passivation layer of a metal oxide of the metals Al, Hf, Y or Sc or the mixed oxides thereof, the layer having an amorphous structure and its layer thickness being 20 to 200 nm.
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: May 11, 2004
    Assignee: Patent-Treuhand-Gesellschaft fuer Elektrische Gluehlampen mbH
    Inventors: Erich Arnold, Renate Hirrle, Christina Wille, Hans-Dieter Witzke
  • Color display having sequential primary color generation
    Patent number: 6734841
    Abstract: The invention relates to an improved color display with temporary sequential primary color mixing, in the case of which a discharge lamp for dielectrically impeded discharges is used for backlighting.
    Type: Grant
    Filed: February 13, 2001
    Date of Patent: May 11, 2004
    Assignee: Patent-Treuhand-Gesellschaft fuer Elektrische Gluehlampen mbH
    Inventors: Michael Seibold, Udo Custodis, Reinhard Lecheler
  • Highly efficient fluorescent material
    Patent number: 6724142
    Abstract: Fluorescent material from the class of the silicide nitrides, Sr being used as cation, and the suicide nitrides being doped with trivalent Ce.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: April 20, 2004
    Assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH
    Inventors: Andries Ellens, Guenter Huber
  • Ballast for operating at least one low-pressure discharge lamp
    Patent number: 6717371
    Abstract: The invention relates to a ballast for operating at least one low-pressure discharge lamp, preferably a three- or four-lamp ballast. In order for all parallel- or series-connected low-pressure discharge lamps (L40-L43) to shine equally bright even in the case of strong dimming, the ballast according to the invention has a transformer (Tr40) for balancing the currents in the lamp branch circuits and a transformer (Tr41) for compensating the losses owing to parasitic capacitances.
    Type: Grant
    Filed: July 16, 2002
    Date of Patent: April 6, 2004
    Assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH
    Inventors: Juergen Klier, Rene Twardzik
  • Incandescent lamp for motor vehicle headlamps
    Patent number: 6709130
    Abstract: The invention relates to a double-filament halogen incandescent lamp for a motor vehicle headlamp. In order to reduce the light shading effects caused by the filament holder, at least one of the power supply wires (8) is provided with a section (8a) that projects out of the common plane of the power supply wires (7, 8, 9) and is guided past the main filament (5), this section (8a) being shaped such that light beams that are emitted by the main filament (5) perpendicular to its filament axis are not obstructed by the power supply wire (8).
    Type: Grant
    Filed: September 12, 2002
    Date of Patent: March 23, 2004
    Assignee: Pätent-Treuhand-Gesellschaft fuer elektrische Gluehlampen mbH
    Inventors: Gerhard Behr, Peter Helbig, Christian Seichter
  • Headlight lamp having base flange with three clips
    Patent number: 6710526
    Abstract: The headlight bulb includes at least one lamp body (1), at least one luminous element (3) enclosed within the at least one lamp body (1), a lamp base (2) in which the at least one lamp body (1) is fixed and power connectors (4, 5) for supply of energy to the at least one luminous element (3). The lamp base (2) includes a base flange (20) and at least three reference tangs (21), which are arranged on a plane, which is level with the plane of the base flange (20). The base flange (20) further includes three clips (22) arranged around the circumference thereof, which are sprung in a direction perpendicular to the plane of the base flange and which cooperate with the reference tangs (21) to mount the bulb in a headlight.
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: March 23, 2004
    Assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbh
    Inventor: Peter Helbig
  • Discharge lamp operating circuit having a circuit for detecting the proximity to capacitive operation
    Patent number: 6707262
    Abstract: The invention relates to an operating circuit for a discharge lamp, having a detection circuit for identifying the proximity to capacitive operation, which uses lamp current fluctuations for detection purposes.
    Type: Grant
    Filed: June 10, 2003
    Date of Patent: March 16, 2004
    Assignee: Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH
    Inventors: Olaf Busse, Markus Heckmann
  • Process and apparatus for producing oxidic nanocrystals
    Patent number: 6702957
    Abstract: The present invention relates to oxidic nanocrystals and a process and apparatus for producing oxidic nanocrystals from metalorganic compounds or volatile inorganic compounds. In particular, the process is suitable for oxidic or oxysulfidic nanocrystals, particularly based on the elements Y, Gd, Mg, Ca, Ba and Al. The nanocrystals preferably have a mean initial particle size of 1 to 20 nm.
    Type: Grant
    Filed: November 6, 2001
    Date of Patent: March 9, 2004
    Assignee: Patent-Treuhand-Gesellschaft fuer Elektrische Gluehlampen mbH
    Inventors: Armin Konrad, Torsten Fries, Alfred Gahn, Franz Kummer