Osram Gmbh

Osram Ag

Osram Gesellschaft MIT Beschraenkter Haftung

Osram Gesellschaft MIT Beschrankter Haftung

Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh

Patent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh

Joachim Mühlschlegel

Alois Braun

Walter Limmer

Markus Heckmann

Harald Schmitt

Markus Ziegler

Warren Paul Moskowitz

Andreas Kloss

Thomas Pollischansky

Bernd Koch

Young G Kang

A circuit arrangement for operating light sources includes input terminals for a power supply system voltage, a first rectifying circuit, a boost converter having output terminals, a half-bridge arrangement having two switches, which is connected to the output terminals of the boost converter, an inductance, the first terminal of which is coupled to the centre point of the half-bridge, and a second rectifying circuit, the first input terminal of which is coupled to the second terminal of the inductance and the second input of which is coupled to one of the output terminals of the boost converter. The output terminals of the second rectifying circuit are coupled to the inputs of a current-compensated inductor. At least one light source is connected to the output terminals of the current-compensated inductor, and the output terminals of the current-compensated inductor are coupled to an output terminal of the boost converter via filter capacitors.

Circuit arrangement for operating light sources

A method for minimizing the insulation stress of a high-pressure discharge lamp system, with an operating device, which generates a high voltage for starting the high-pressure discharge lamp, wherein a starting voltage time sum applied during lamp starting is minimized, the starting voltage time sum is the sum of all time segments Zduring which the magnitude of the starting voltage exceeds a starting voltage limit, and the starting voltage limit is defined as the factor range of a maximum value, in terms of magnitude, of the applied high voltages.

Method and operating device for minimizing the insulation stress of a high-pressure discharge lamp system

A lamp holder () for a gas discharge lamp (), having at least two receptacles (B, B) for at least two pins (P, P) of a gas discharge lamp (), wherein at least one shielding conductor (S, S, S, S) is disposed in the vicinity of each receptacle (B, B).

Lamp holder and lamp base for a gas discharge lamp

A circuit arrangement for supplying a lamp wattage on a high-pressure gas discharge lamp in the form of an alternating current having an operating frequency, said operating frequency being frequency-modulated within large limits such that no acoustic resonances are embodied in the lamp. Amplitude modulation through the frequency response of an interface is compensated by modulating an amplitude of a supply voltage.

Circuit arrangement and method for the operation of high-pressure gas discharge lamps

A circuit arrangement for operating a high pressure discharge lamp includes a bridge circuit with at least two switches, a control device controlling the switches. The bridge circuit is a half-bridge circuit having exactly two switches. The control device switches on and off in an alternating manner, the first switch and the second switch of the bridge circuit having a first frequency. When the first switch is switched off for controlling the other switch with a rectangular signal of a second frequency which is greater than the first frequency and a predeterminable connection duration. The circuit also includes a tension measuring device measuring an actual value of tension over the high pressure discharge lamp. A reference device provides at least one upper threshold value for the voltage via the high pressure discharge lamp. A comparison device compares the actual voltage over the high pressure discharge lamp with the threshold value.

Circuit arrangement and method for operating a high-pressure discharge lamp

A circuit arrangement for providing a lamp wattage to a high-pressure gas discharge lamp (Lp), the arrangement includes an inverter (T, T) which supplies to the high-pressure gas discharge lamp (Lp), a lamp current (IL) which is essentially an alternating current with an operating frequency which is frequency modulated in a frequency range between a minimum frequency and a maximum frequency, an arithmetic mean is defined which is equal to the temporal mean of the frequency values for the operating frequency, swept in a lamp operation. A limit mean is defined which is equal to one half of the sum of minimum frequency and maximum frequency and is less that the arithmetic mean.

Circuit arrangement and method for the operation of a high-pressure gas discharge lamp

High-pressure discharge lamps can only be restarted in the hot state at a very high starting voltage. In order to avoid hotstarting, a method for operating high-pressure discharge lamps without hotstarting comprises two high-pressure discharge lamps () being provided in one luminaire. The two high-pressure discharge lamps are driven as follows: When the luminaire is switched off, the first lamp is switched off, and the second lamp is set to be in a standby state for the period of time for the recovery of the first lamp or remains in such a state, in which it is not switched off. When the luminaire is switched on again during this period of time, the second lamp can assume the operating state again immediately without being started. If the luminaire is not switched on again, the second lamp is likewise switched off once the period of time has elapsed.

Method for operating high-pressure lamps without hotstarting and luminaire having two high-pressure discharge lamps

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.

Electronic ballast for a high-pressure discharge lamp having a current-measuring device

The invention relates to an electronic ballast, to an illumination device including the electronic ballast and an associated high-pressure discharge lamp, and to a corresponding operating method for a high-pressure discharge lamp, in which resonance excitation is used to generate a voltage-increased power for a transfer phase of the lamp Lp after starting.

Electronic ballast having resonance excitation for generating a transfer voltage

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.

Growing community of inventors

Gröbenzell, Germany

Joachim Mühlschlegel