Abstract: The invention relates to an electronic ballast presenting an input capacitor and comprising and step-up chopper for operating a load, for example a discharge lamp, on a phase control dimmer having an integrated or parasite inductance. In such a way, the voltage overshooting on the input capacitor are reduced by active charge or discharge thereof.

Abstract: The invention relates to an electronic ballast comprising a converter which is used to operate a discharge lamp, for example, a low pressure discharge lamp, for selectively operating, in a direct manner, the supply network or a phase section dimmer. Jumps in the supply voltage are decoupled by a differential which is connected between at least one of the network lines and the reference potential of the ballast and transmitted to a control of the ballast, such that the control of the converter can distinguish between the operation on the phase section dimmer and on the network supply.

Abstract: A discharge lamp includes a reflector in which a light-emitting tube is housed in an interior of the reflector, and in which a protective glass, provided to cover the open part of the reflector, is fixed to the reflector using a silicone adhesive. A recessed part for suppressing the flow of the silicone adhesive into the reflector interior is provided in the circumferential direction in the reflector front face on which the protective glass is affixed using the silicone adhesive.

Abstract: A circuit arrangement for operating at least one electric lamp having an inverter has at least one first and one second bridge transistor arranged in series with one another, a first drive circuit for the first bridge transistor; a second drive circuit for the second bridge transistor; the and second drive circuits being designed to drive the first and second bridge transistors to switch alternately completely on and off during normal lamp operation; and at least one protective apparatus; the at least one protective apparatus being designed, in the case of a value for a reference voltage, which is correlated with the voltage across the bridge transistor which has just been switched off, above a predeterminable limit value, to drive the bridge transistor, which has just been completely switched on, such that it is no longer completely switched on. A related method is also described.

Abstract: Discharge lamp for dielectrically impeded discharges with a bottom plate and a cover plate and supporting elements therebetween the invention relates to a discharge lamp for dielectrically impeded discharges having a flat lamp design. In this case, supporting elements (5) are provided between a cover plate (1) and a bottom plate (2), and each comprise two supporting projections (5a, 5b), of which one is integral with the cover plate and the other is integral with the bottom plate.

Abstract: An electrodeless discharge lamp lighting fixture which can secure lightness even in the case of a dimmering control at a low temperature. The electrodeless discharge lamp lighting fixture according to the present invention comprises an electrodeless discharge lamp 1, a dimmering inverter 3 which is connected to an AC power supply 11 and applies a high-frequency voltage to the electrodeless discharge lamp 1, a controlling relay 5 adapted to receive an AC dimmering signal to turns ON/OFF, and a control substrate 4 which converts, into DC, the AC dimmering signal received from said controlling relay 5 and applies the DC dimmering signal to the dimmering inverter 3, wherein, in case the control relay 5 is ON, the control substrate 4 outputs a DC dimmering signal of 4 volts or greater, and the dimmering inverter 3 assumes an operation mode of about 50%.

Abstract: The invention relates to a circuit arrangement which is used to operate a low pressure discharge lamp (EL), wherein the discharge lamp receives power. Said circuit arrangement is embodied in such a manner that power-determination components (C2a, L2a) of the circuit arrangement are embodied in a temperature-dependent manner such that the power consumption of the lamp is limited when the temperature rises. Capacitors (C2a) and throttles (L2a) can be embodied in a temperature-dependent manner in a control circuit (AS) of the circuit arrangement.

Abstract: A color-tunable illumination system for imaging illumination having a tuning means and at least two light sources of different colors. The illumination system comprises a reflector having a reflector contour, the light sources being accommodated in the vicinity of the reflector contour, and a compact diffusing medium accommodated at the focal point of the reflector. The light from the light sources is directed substantially onto the diffusing medium and then, from there, is diffused onto the reflector contour, electronic driving of the light sources making it possible to regulate the intensity of the light sources separately from one another, with the result that the light leaving the reflector can be color-tuned.

Abstract: A light regulation device includes at least one light sensor which provides at its output a real brightness value, at least one regulator to which a set brightness value can be supplied, besides the real value, and a number n of output connections, n being greater than or equal to two. Each output connection is coupled to the output of a regulator in order to modify the light flux which can be supplied to at least one of the lighting elements. The regulator is designed to determine a difference between set and real values, to verify whether this difference lies within or outside a predeterminable tolerance range, and, in the event that the difference lies outside the tolerance range, to modify accordingly the light flux from the lighting elements which can be connected to the n output connections. At least one limit of the tolerance range depends on the actual light flux value.

Abstract: A circuit arrangement for controlling the operation of an electronic transformer (1) whose power supply can be lowered. The electronic transformer (1) is electrically connected to an output of a switch (7), and the switch (7) can be controlled by a control unit (5). A radio interference suppression circuit (8) is coupled to the switch (7) and, according to a control state, which exists on the switch (7), for controlling the starting behavior of the electronic transformer (1), the radio interference suppression circuit (8) can be disconnected from the switch (7) and/or an output (A) of the switch (7) can be short-circuited. A method for controlling the operation of an electronic transformer is also disclosed.

Abstract: A circuit arrangement for operating a high pressure discharge lamp includes a voltage transformer, a load circuit which is supplied by the voltage transformer and provided with connections for the high pressure discharge lamp (La), a choke (L2b) for limiting a current passing through the high pressure discharge lamp (La) and with an impulse igniting device for igniting a gas discharge therein, wherein the choke (L2b) is embodied in the form of the secondary winding of the igniting transformer (T2) of the impulse igniting device.

Abstract: The invention relates to a circuit arrangement for operation of a discharge lamp (EL) with an inverter (INV) which generates a high-frequency alternating current from an input voltage and with a tuned circuit provided with at least one choke (L) and at least one tuned capacitor (C3, C4), by means of which the lamp (EL) is supplied, whereby at least one tuned capacitor (C4) is connected in series with a switch element (T1) parallel to the lamp (EL). The resonance capacitance for control of the lamp can be varied by switching in or out the tuned capacitor. For example, the resonance capacitance can be increased for pre-heating and reduced on lamp operation.

Abstract: The invention relates to a device for operating or starting a high-pressure discharge lamp (10), whereby the device comprises a voltage-dependent switch (131), for generation of the starting voltage for the high-pressure discharge lamp (10), the switch threshold voltage of which is greater or equal to the starting voltage of the high-pressure discharge lamp (10) and a corresponding operating or starting method. The invention permits an impulse starting of the high-pressure discharge lamp (10) without use of a starter transformer. Said impulse starting device and said method may be advantageously combined with the high-frequency operation of the high-pressure discharge lamp (10), in particular, with a vehicle headlight high-pressure discharge lamp.

Abstract: A device for operating or starting a high-pressure discharge lamp (18), provided with an auxiliary starting electrode (181), includes a voltage-dependent switch member(16), for providing the starting voltage for the high-pressure discharge lamp (18) to the auxiliary starting electrode (181) and the switch threshold voltage of the voltage-dependent switch member (16) is greater than or the same as the starting voltage of the high-pressure discharge lamp (18).

Abstract: The invention relates to an electronic ballast for a discharge lamp LA1 having an EOL monitoring circuit R1, R2, U1, R9, U2-A, U2-B, U3-A, AE, which has a current differential amplifier U1 having a current mirror input.

Abstract: A motor vehicle headlight (80) comprises at least two modules (70) for light production, the radiation characteristics of at least one of the modules (70) being adjustable in a reference system associated with the headlight. Preferably, modules (70) of the headlight (80) have different radiation characteristics and the irradiation characteristics of at least two of the modules (70) overlap to form an adjustable radiation characteristic of the headlight (80).

Abstract: A socket for a lamp is disclosed, in particular for a vehicle lamp, comprising a socket housing and at least two contact elements fixed in the socket housing for housing and electrical contacting of the lamp. According to the invention, the contact elements of the socket housing are fixed by means of a positive or non-positive fit with a socket pin which may be fixed therein.

Abstract: A device for igniting the gas discharge in a high-pressure discharge lamp (La). The igniting device is embodied as a pulsed igniting device (C, FS, Tr1) while a piezoelectric transformer (PT) is provided for supplying the pulsed igniting device (C, FS, Tr1) with voltage.

Abstract: The phosphor having the composition xAE2SiO4:D.yREN, in which AE=(Sr, Ba, Ca, Mg) and D=Eu, and RE=La, Y, delivers a blue to yellow-orange emission and is distinguished by a high efficiency. It can be used for a very wide range of light sources.

Abstract: A luminescent powder (1) with luminescent particles (2) having an average luminescent-particle size (3) selected from the range of from 0.1 ?m inclusive to 5.0 ?m inclusive. The luminescent particles comprise primary particles (4) having an average primary-particle size (5) selected from the range of from 0.1 ?m inclusive to 1.0 ?m inclusive. The primary particles which, for example, consist of a cerium-doped yttrium-aluminum garnet (Y3Al5O12), are agglomerated to form the luminescent particles. A method for producing the luminescent powder has the following steps: a) preparing at least one precursor of the primary particles, b) producing the primary particles from the precursor of the primary particles, and c) forming the luminescent particles of the luminescent powder from the primary particles. The precursor for Y3Al5O12 is, for example, a powder mixture of hydroxides.