Osram Gesellschaft MIT Beschraenkter Haftung

Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh

Patent-treuhand-gesellschaft Fuer Elektrische Gluehlampen Mbh

Osram Gesellschaft MIT Beschrankter Haftung

Osram Gmbh

Osram Ag

Patent-treuhand-gesellschaft Fur Elektrisch Gluhlampen Mbh

Osram S.p.a. - Societa' Riunite Osram Edison Clerici

Walter Limmer

Alois Braun

Maximilian Schmidl

Andreas Huber

Peter Niedermeier

Joachim Mühlschlegel

Bernd Rudolph

Paolo De Anna

Francesco Angelin

Markus Ziegler

Herbert Kästle

Thomas Rossmanith

Young G Kang

Various embodiments may relate to a power supply unit, including an output for outputting an operating current depending on an internal measurement signal, a communications line, and a current-measuring device, which is connected to the communications line. The current-measuring device is designed to generate a current on the communications line which is proportional to the conductance of a current-setting resistance. The current-measuring device has a current mirror, which is designed to mirror the generated current on the communications line. The current-measuring device is designed to convert the mirrored current into an internal measurement signal with a reference potential which is different than the communications line. At least one light source module is connectable to the output, wherein the at least one light source module has the current-setting resistance, which is connectable to the communications line.

Lighting system with an interface having a power supply unit and at least one light source module

A method for operating a lamp may include: Connecting a device to a pair of input connections of an electronic ballast and by this means determining a respective dimming duration for at least one predetermined situation; and Activating the lamp by the electronic ballast in at least one predetermined situation such that the lamp emits light with a reduced intensity compared with the normal intensity at which the lamp otherwise emits light over a period of a dimming duration determined for this situation.

Method for operating a lamp and electronic ballast

A method for operating a high pressure discharge lamp, with the high pressure discharge lamp being operated by a current inverter with a square wave lamp current having a positive phase with positive current flow and a negative phase with negative current flow, and with the current inverter being controlled by a control arrangement wherein the method comprises the steps of measuring a value for the positive current flow representing the lamp wattage or the square wave lamp current, measuring a value for the negative current flow representing the lamp wattage or the square wave lamp current; calculating a predetermined setpoint value in each case from a guide variable of a lamp wattage or of the square wave lamp current and the measured value for the phase with positive current flow; calculating a predetermined setpoint value in each case from a guide variable of a lamp wattage or of the square wave lamp current and the measured value for the phase with negative current flow; and outputting the two predetermined setpoint values to the current inverter.

Circuit arrangement and method for operating a high pressure discharge lamp

A circuit arrangement for operating discharge lamps is provided with an input, to which an AC system voltage from a power supply system can be connected, an output, to which at least one discharge lamp can be connected, a backup capacitance, which is arranged between the input and the output, and a switch, which is in a charging current path of the backup capacitance. The circuit arrangement may include a driver configured to clock the switch for a predetermined period of time when the circuit arrangement is switched on for periodically interrupting the charging current path of the backup capacitance.

Circuit arrangement and method for operating discharge lamps

In various embodiments, a circuit arrangement may include a voltage-measuring device embodied to measure an output voltage, wherein the voltage-measuring device is embodied to provide at its output a signal which is correlated with the measured output voltage, wherein the voltage-measuring device is coupled to a control device for the purpose of transmitting said signal to the control device, and wherein the control device is embodied to vary an off-time as a function of the measured output voltage.

Circuit arrangement and method for operation of a discharge lamp

A method for making a lamp wattage available for operating at least one gas discharge lamp depending on a dimming signal which is input into a wattage factor correction circuit, having a switch element that is switched on clocked by a switch-on time, wherein the wattage factor correction circuit emits an intermediate circuit voltage which in turn is input into a converter that makes the lamp wattage available, comprising the steps of: in an operating phase in which the dimming signal has no phase leading edge and no phase trailing edge, the wattage factor correction circuit and the converter are regulated independently of each other using a separate regulating circuit in each case; and in an operating phase in which the dimming signal has a phase leading edge or a phase trailing edge, the two independent regulating circuits are coupled to each other via a higher-order third regulating circuit such that the lamp wattage of the converter is adjusted such that the switch-on time of the switch element in the wattage factor correction circuit corresponds to a predetermined time.

Method and circuit arrangement for making a lamp wattage available for operating at least one gas discharge lamp

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

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.

Step-up converter having power factor correction

Lighting system for high-pressure discharge lamps which can generate a lamp voltage UL which is amplitude and, if necessary, frequency-modulated. The frequency modulation is provided by an inverter whose inverter frequency is modulated. The inverter is fed by a clocked d.c. voltage supply which emits an operating voltage Uwhich is amplitude-modulated.

Lighting system

The invention relates to the supply of power to a driver circuit (V) for a switching transistor (T) in an operating circuit, in particular for lamps. The supply is provided via a pump circuit with a potential isolation capacitor (C ), two rectifier diodes (D , D ) and an energy-storage capacitor (C ), and is independent of the reference ground potential of the switching transistor (T).

Operating circuit with an improved power supply for a driver circuit

A circuit arrangement for igniting a lamp, in particular a high-pressure discharge lamp. The lamp has an ignition transformer with a primary side and a secondary side, the secondary side is connected to the lamp which is to be ignited, and the primary side is connected to an ignition switch. The ignition switch is controlled for actively disconnecting a current flowing through the primary side of the ignition transformer.

Circuit arrangement for igniting a lamp

The invention relates to a circuit arrangement having a half-bridge arrangement comprising a first and a second switch (T,;T,), each switch (T,;T,) having, between its operating and reference electrodes, an internal diode (DB,;DB,), which is reverse-connected in parallel with the main current flow direction of the respective switch (T,;T,), and also an internal capacitance (C,;C,), a series diode (DS,;DS,) being arranged in series with the respective switch (T,;T,) in the main current flow direction in such a way that current can flow in the main current flow direction, and a freewheeling diode (DF,;DF,) being connected in parallel with the respective series circuit formed by the switch (T,;T,) and the series diode (DS,;DS,), and having a load circuit (L;RL), which has at least one inductive component (L) and is connected to the midpoint of the half-bridge arrangement. In order to reduce the failure rate of the series diodes (DS,;DS,), a load-relieving capacitance (CE,;CE,) is connected in parallel with each series diode (PS,;DS,).

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Munich, Germany

Walter Limmer