Abstract: The invention relates to an electronic ballast for a dielectrically impeded discharge lamp (L), which ballast has an inductor (W1, W2, W3) with a winding (W2) that can be short-circuited.

Abstract: The invention relates to a ballast and its operating method for a dielectrically impeded discharge lamp. The ballast contains a transformer having a third winding which can be short-circuited via a switch. By this means, the injection of the voltage pulse into the lamp circuit may be controlled by an external trigger signal.

Abstract: The present invention relates to a circuit arrangement for driving a high-pressure discharge lamp (14) having a terminal (1) for a first voltage potential; a terminal (2) for a second voltage potential; a terminal (4) for feeding a starting voltage; a first electrical connection, which provides at its first end a first terminal (26) for a high-pressure discharge lamp (14), and which is coupled at its second end to the terminal (1) for the first voltage potential; a second electrical connection, which provides at its first end a second terminal (28) for a high-pressure discharge lamp (14), and which is coupled at its second end to the terminal (2) for the second voltage potential; a first inductor (30) that is arranged in the second electrical connection; and a starting device (24) that is coupled on the input side at least to the terminal (4) for feeding a starting voltage, and that is coupled on the output side to one of the terminals (26; 28) for the high-pressure discharge lamp; there being arranged in the

Abstract: Drive circuit for operating at least one lamp in an associated load circuit, in which terminals for the lamp are arranged, having two switches in a half-bridge arrangement, each switch including a cascode circuit of a bipolar transistor having a control, a working and a reference electrode, and a field-effect transistor having a control, a working and a reference electrode. The center point of the half-bridge arrangement is coupled to the load circuit, and each cascode circuit has an input circuit, in which a diode and a secondary winding of a transformer, connected in series, are arranged in parallel with the control electrode of the bipolar transistor and the reference electrode of the field-effect transistor, the primary winding of the transformer being arranged in the load circuit such that the load circuit current flows through it when operating the lamp.

Abstract: The current through the components of a half-bridge of an electronic ballast is intended to be limited during the starting phase. For this purpose, the gate of a half-bridge transistor (T2) is driven by a current limiting circuit (D1, D2, D3, T3, C3) in such a way that the current through the transistors (T1, T2) is limited during the starting phase, whereas it remains unlimited during the glow phase and burning phase of the lamp (LA).

Abstract: The invention relates to an adapter (1) having an integrated ballast and starting arrangement for annular fluorescent lamps (2) having a pin base (3) for connecting them to conventional incandescent lamp sockets. The adapter (1) has a cuboidal housing and has at each end a holder which partially encloses the pin base (3) of the fluorescent lamp (2) or the discharge vessel (12) of the fluorescent lamp (2). The first holder in this case also contains a socket for accommodating and making electrical contact with the pin base (3) and the other holder contains a sliding apparatus for locking the lamp (2).

Abstract: The invention relates to an operating method for a lighting system and to a lighting system in which a readiness command is provided, in response to which a ballast drives a discharge lamp in such a way that it heats the electrodes further if the discharge lamp is not burning, so that a controller can use a switch-on command to reignite the discharge lamp without delay by means of a preheating time.

Abstract: The invention relates to a shell-like reflector whose light-reflecting inner side is shaped in such a way that the reflector has two focal lines. In addition, the invention relates to a reflector lamp with such a reflector and an incandescent lamp, whose incandescent filament has at least two filament sections arranged in the focal lines.

Abstract: It is intended to be possible to use a respective setting apparatus (E1, E2) to set the color and the brightness of an illumination device separately. Light sources having three different colors are operated for this purpose. Only one first power supply (CON, PWM1) is provided for two colors, whereas the third color is supplied by a second power supply (CON, PWM2). The brightness can be set by altering the power output of the first (CON, PWM1) and the second (CON, PWM2) power supplies at the same time. The color can be set by altering the power output of the second (CON, PWM2) power supply.

Abstract: The invention relates to an incandescent lamp for vehicle headlights, the incandescent lamp having at least one incandescent filament and a shading apparatus for the at least one incandescent filament, which are both arranged in a lamp vessel, and having power supply lines for the at least one incandescent filament, a first power supply line being connected to the shading apparatus. The abovementioned power supply line has a bent-back end, which is connected to an outgoing filament line of the at least one incandescent filament.

Abstract: In the case of circuit arrangements for operating discharge lamps (Lp1, Lp2) which include a charge pump for reducing line current harmonics, an energy imbalance occurs when the lamps are started. In order for this not to lead to components being destroyed, but for sufficient ignition voltage nevertheless to be generated at the lamps (Lp1, Lp2), a threshold switch (MOV, TH) monitors the frequency of an inverter included in the circuit arrangement.

Abstract: The invention relates to a reflector for an electric lamp, and a reflector lamp having an improved fastening of the electric contacts. The reflector body consists of an electrically insulating plastic and, for the purpose of making electric contact with the lamp, has contact lugs that are fixed at least two different locations on the outer side of the reflector body with the aid of claws or barbs integrally formed on the contact lugs.

Abstract: Circuit arrangement for starting and operating discharge lamps (Lp1, Lp2) with control of the lamp current and preheating of electrode filaments. No control device is required for the sequence of the preheating, igniting and operating phases. This is achieved by a preheating resistor which changes its value after the preheating phase, in combination with controller properties according to the invention.

Abstract: The invention relates to a lamp base having fastening means for a lamp vessel, having a base part that consists of an electrically insulating material and that is equipped with at least two first electric contacts that serve the power supply of at least one luminous means, wherein said base part has at least two second electric contacts, in each case one of said second electric contacts being connected in an electrically conducting fashion to in each case one of said first electric contacts.

Abstract: The electrode comprises a pin-like shank (7) and a head part (8), the electrode, in the region of its discharge-side end, forming a vessel (9) for an emitter, in which there is a bore (16) which is filled with emitter material (10). The vessel, at its discharge-side end face, forms a collar, having an inner collar part (13) which is curved convexly toward the bore and an outer collar part (14) which is curved convexly toward the side wall of the vessel.

Abstract: The invention relates to an illumination unit having an electric lamp and an envelope fixed thereto, the lamp having a base, in particular a G9 base, protruding from said envelope, and the fastening means for the envelope being connected to the lamp vessel such that the base is freely accessible for a corresponding lamp holder.

Abstract: The invention relates to an illumination unit having an electric lamp which has a lamp vessel having a sealed-off end in the form of a glass base, and having an envelope which at least partially surrounds the lamp vessel and rests on the lamp vessel such that the glass base protrudes from the envelope.

Abstract: Switched-mode power supply having a series circuit of an electronic switch (T1) and the primary winding (W1) of a transformer (TX1). The power supply also has a switching snubber device in which, when the electronic switch (T1) is switched off, the energy in the primary winding (W1) is stored in a capacitor (C1). According to the invention, the switching snubber device has a further electronic switch (D1, T2) which remains switched on until the energy stored in the capacitor (C1) is fed back again into the transformer (TX1).

Abstract: The invention relates to a method for operating at least one low-pressure discharge lamp using an inverter (T1, T2), the occurrence of a rectifier effect in the at least one low-pressure discharge lamp (FL1, FL2) being monitored during the operation of the at least one low-pressure discharge lamp (FL1, FL2) in order to determine the end of its life. For the purpose of monitoring the rectifier effect of the at least one low-pressure discharge lamp (FL1, FL2), the electric power (P) fed into the inverter (T1, T2), the d.c. voltage drop (Udc1, Udc2) across the electric connections of the at least one low-pressure discharge lamp (FL1, FL2) and the r.m.s. value (Uac) of the a.c. voltage component of the running voltage of the at least one low-pressure discharge lamp (FL1, FL2) are evaluated.

Abstract: The invention proposes a dielectric barrier discharge lamp having a phosphor mixture and the use of a dielectric barrier discharge lamp with a color temperature of at least 10,000 K for viewing X-rays. The phosphor mixture consists of the phosphor components R: europium-activated yttrium gadolinium borate ([Y, Gd]BO3:Eu),G: terbium-activated lanthanum phosphate (LaPO4: [Tb]) or cerium- and terbium-activated lanthanum phosphate (LaPO4:[Ce,Tb]) and B: europium-activated barium magnesium aluminate (BaMgAl10O17:Eu). The following applies to the proportions by weight in the mixture: 0.05≦R≦0.15, 0.50≦G≦0.70, 0.20≦B≦0.40 and R+G+B=1.