Patents by Inventor Joachim Muehlschlegel

Joachim Muehlschlegel 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: 20090179571
    Abstract: According to the invention, a state automaton is used when operating a high-pressure discharge lamp on a ballast operated by means of a microprocessor in order to prevent certain malfunctions.
    Type: Application
    Filed: November 28, 2006
    Publication date: July 16, 2009
    Applicant: OSRAM GESELLSCHAFT MIT BESCHRAENKTER HAFTUNG
    Inventors: Stefan Boldt, Joachim Mühlschlegel
  • Patent number: 7541744
    Abstract: The invention relates to an electronic ballast and to an operating method for high-pressure discharge lamps. During a current measurement, in particular for current regulation, only switching phases of a specific polarity of the current are taken into consideration.
    Type: Grant
    Filed: February 3, 2006
    Date of Patent: June 2, 2009
    Assignee: Osram Gesellschaft mit Beschraenkter Haftung
    Inventors: Alois Braun, Walter Limmer, Joachim Mühlschlegel, Markus Ziegler
  • Publication number: 20090051297
    Abstract: An electronic control gear for a HID lamp receives an input signal for operating the lamp and frequency modulates the input signal to generate a frequency modulated output signal that drives an arc of the lamp. The frequency modulation of the output signal sweeps continuously between a low frequency modulation and a high frequency modulation, the low frequency modulation being a frequency f1 in a range of 125 kHz to 150 kHz and the high frequency modulation being a frequency f2 in a range of 230 kHz to 300 kHz, where f2-f1 is at least 0.4*f1. A power amplifier changes an amplitude of the frequency modulated output signal during the low frequency modulations so that a current amplitude of the frequency modulated output signal is substantially constant, and a variable gain transformer adjusts a voltage of the frequency modulated output signal during starting of the lamp.
    Type: Application
    Filed: September 20, 2005
    Publication date: February 26, 2009
    Inventors: Warren Moskowitz, Joachim Muehlschlegel
  • Patent number: 7116084
    Abstract: A step-up converter has a power factor correction, has an input for connection to a supply voltage, in particular a rectified AC voltage; an inductor, a diode and a storage capacitor, which are coupled in a series arrangement between the input and the output, in which the voltage that is dropped across the storage capacitor is provided at the output; a switch, which is coupled between a junction point between the inductor and the diode, on the one hand, and a reference potential, on the other hand; and a drive circuit for the switch which controls the times for which the switch remains closed and open; the drive circuit being designed to control the time for which the switch remains closed as a function of the freewheeling time of the inductor. A method for operating such a step-up converter is also disclosed.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: October 3, 2006
    Assignee: Patent-Treuhand-Gesellschaft fuer Elertrische Glubhlampen mbH
    Inventors: Alois Braun, Walter Limmer, Joachim Mühlschlegel
  • Patent number: 6781324
    Abstract: A ballast for at least one electric incandescent lamp, having at least two switching elements (T1, T2) that are coupled to one another with the formation of a first tie point (VP1), a drive circuit (10) with at least one output for driving the switching elements (T1, T2) with the aid of a drive signal that has a pulse duty factor (d) and an operating frequency (fs), and with an input for a dimming signal (Ud), and a power transformer (Ü) whose primary side (L1) is coupled to the first tie point (VP1), it being possible to connect the electric incandescent lamp (LA1; LA2) to the secondary side (L2) thereof, the drive circuit (10) being designed to vary the pulse duty factor (d) and the operating frequency (fs) of the drive signal as a function of the dimming signal (Ud).
    Type: Grant
    Filed: September 18, 2002
    Date of Patent: August 24, 2004
    Assignee: Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
    Inventor: Joachim Muehlschlegel
  • Patent number: 6603674
    Abstract: Electronic transformers with a self-excited half bridge can be destroyed by high-voltage pulses from the mains supply lead. This can happen by the high-voltage pulse initiating a starting operation which leads to cross currents. This destruction mechanism is suppressed by specifically discharging a starting capacitor.
    Type: Grant
    Filed: December 5, 2001
    Date of Patent: August 5, 2003
    Assignee: Patent-Treuhand-Gesellschaft fuer Elektrische Gluehlampen mbH
    Inventors: Felix Franck, Helmut Haeusser-Boehm, Joachim Muehlschlegel
  • Publication number: 20030052623
    Abstract: The present invention relates to a ballast for at least one electric incandescent lamp, having at least two switching elements (T1, T2) that are coupled to one another with the formation of a first tie point (VP1), a drive circuit (10) with at least one output for driving the at least two switching elements (T1, T2) with the aid of a drive signal that is characterized by a pulse duty factor (d) and an operating frequency (fs), and with an input for a dimming signal (Ud), and a power transformer (Ü) whose primary side (L1) is coupled to the first tie point (VP1), it being possible to connect the at least one electric incandescent lamp (LA1; LA2) to the secondary side (L2) thereof, the drive circuit (10) being designed to vary the pulse duty factor (d) and the operating frequency (fs) of the drive signal as a function of the dimming signal (Ud). Furthermore the invention relates to a corresponding method.
    Type: Application
    Filed: September 18, 2002
    Publication date: March 20, 2003
    Applicant: PATENT TREUHAND-GESELLSCHAFT FUR ELEKTRISCHE GLUHLAMPEN MBH
    Inventor: Joachim Muehlschlegel
  • Publication number: 20020071299
    Abstract: Electronic transformers with a self-excited half bridge can be destroyed by high-voltage pulses from the mains supply lead. This can happen by the high-voltage pulse initiating a starting operation which leads to cross currents. This destruction mechanism is suppressed by specifically discharging a starting capacitor.
    Type: Application
    Filed: December 5, 2001
    Publication date: June 13, 2002
    Applicant: Patent-Treuhand-Gesellschaft fuer elektrische Gluehlampen mbH
    Inventors: Felix Franck, Helmut Haeusser-Boehm, Joachim Muehlschlegel