Abstract: A cooling device for cooling an electronic component, such as a power semiconductor, includes a cooling body which can be thermally coupled to the component, at least one sonotrode element for generating ultrasonic waves having a predetermined wavelength directed towards the cooling body, and a resonance tube that is associated with the sonotrode element and that is arranged between the sonotrode element and the cooling body, wherein a distance between the sonotrode element and the cooling body corresponds to an integral multiple of a quarter of a wavelength, such that a standing wave is formed between the at least one sonotrode element and the cooling body.

Abstract: A circuit arrangement for operating a high-pressure discharge lamp with an electronic ballast, which is designed to provide an AC feed signal for the high-pressure discharge lamp, the frequency of the AC feed signal being at least 1 MHz, wherein the electronic ballast is adapted to modulate the amplitude of the AC feed signal.

Abstract: A circuit arrangement for operating a high-pressure discharge lamp (12) with an electronic ballast, which is designed to provide an AC feed signal for the high-pressure discharge lamp (12). The AC feed signal comprises, in the time range as modulation period (T), a serial sequence of at least one first signal section (Sa1), one second signal section (Sa2) and one third signal section (Sa3), which are associated with a first, a second and a third color. The AC feed signal is an amplitude-modulated RF signal (IRF) with a frequency (f) of at least 500 kHz.

Abstract: An illuminator may include at least one receiver configured to wirelessly tapping off power from an alternating field; and at least one light source which is connected to the receiver, wherein the illuminator has a flat adhesive surface which is magnetic or can be magnetized.

Abstract: A starting circuit arrangement for starting at least one discharge lamp by applying an electrical starting voltage pulse to the discharge lamp, the starting circuit arrangement has: at least one source circuit arrangement for providing an electrical primary voltage pulse, at least one starting circuit for providing the starting voltage pulse, and at least one inductive coupling element for inductively coupling-in the primary voltage pulse into the starting circuit for the purpose of generating the starting voltage pulse. The inductive coupling element has a transformation ratio for a voltage transformation which is selected from the range of from 1/25 to 1/400. A method for starting a discharge lamp by applying a starting voltage pulse using the starting circuit arrangement is also disclosed.

Abstract: A circuit arrangement for operating a high-pressure discharge lamp (12) with an electronic ballast, which is designed to provide an AC feed signal for the high-pressure discharge lamp (12). The AC feed signal comprises, in the time range as modulation period (T), a serial sequence of at least one first signal section (Sa1), one second signal section (Sa2) and one third signal section (Sa3), which are associated with a first, a second and a third color. The AC feed signal is an amplitude-modulated RF signal (IRF) with a frequency (f) of at least 500 kHz.

Abstract: The invention specifies a starting circuit arrangement for starting at least one discharge lamp by applying an electrical starting voltage pulse to the discharge lamp, the starting circuit arrangement having the following features: at least one source circuit arrangement for providing an electrical primary voltage pulse, at least one starting circuit for providing the starting voltage pulse, and at least one inductive coupling element for inductively coupling-in the primary voltage pulse into the starting circuit for the purpose of generating the starting voltage pulse. The starting circuit arrangement is characterized by the fact that the inductive coupling element has a transformation ratio for a voltage transformation which is selected from the range of from 1/25 to 1/400.

Abstract: An inductive component, for the formation of a magnetic circuit has at least one wire winding and at least one core with a ferromagnetic core material. The core comprises a gap and at least one further gap to interrupt the magnetic circuit. The inductive component is characterized in that the gaps each have a gap width of at least 1.0 mm. The core comprises two pieces, for example, which are arranged opposed to each other across the gaps and separated from each other by the gap width. The component is advantageously symmetrical with an essentially equal gap width for the gaps. A miniaturized inductive component is possible by the use of a hire winding made from high frequency braided wire and core material capable of accepting high frequencies, which has a high Q-factor even on a high power throughput and thus low electrical losses. In order to increase the Q-factor, the inductive component also has a cooling device for cooling the wire winding.

Abstract: An electrical circuit for voltage transformation, the electrical circuit being suitable for power factor correction, enables a good power factor correction to be achieved with a high efficiency of between 80% and 95% in the MHz frequency region. To this end, few components suitable for high frequencies (capacitors, inductances, diodes and high frequency switches) are used. The diodes are, for example, Schottky diodes with SiC as the diode material. The high frequency switch includes a powerful MOS transistor.

Abstract: A circuit (1) used for power factor correction, corresponds to a known circuit that includes a high-frequency frequency source (15) for generating a high-frequency voltage (Uf) for a pump capacitor (14). The high-frequency voltage source (15) has two on/off switches (151, 152) connected in series that generate, at an electric connection point (153), a square wave voltage (U1) that varies between these two switches with a frequency (f) of at least 1 megahertz. The voltage source further includes a smoothing device (150) for generating from the square wave voltage a smoothed voltage (Uf) for the pump capacitor, whereby the smoothed voltage varies with a frequency (f) of at least 1 megahertz.

Abstract: The invention relates to an inductive component (1), for the formation of a magnetic circuit, comprising at least one wire winding (3) and at least one core (4) with a ferromagnetic core material. Said core comprises a gap (7, 8) and at least one further gap (8, 7) to interrupt the magnetic circuit. The inductive component is characterised in that the gaps each have a gap width of at least 1.0 mm. The core comprises two pieces, for example, which are arranged opposed to each other across the gaps (7, 8) and separated from each other by the gap width. The component is advantageously symmetrical with an essentially equal gap width for the gaps. A miniaturised inductive component is possible by the use of a hire winding made from high frequency braided wire and core material capable of accepting high frequencies, which has a high Q-factor even on a high power throughput and thus low electrical losses.

Abstract: A circuit (1) used for power factor correction, corresponds to a known circuit that includes a high-frequency frequency source (15) for generating a high-frequency voltage (Uf) for a pump capacitor (14). The high-frequency voltage source (15) has two on/off switches (151, 152) connected in series that generate, at an electric connection point (153), a square wave voltage (Ul) that varies between these two switches with a frequency (f) of at least 1 megahertz. The voltage source further includes a smoothing device (150) for generating from the square wave voltage a smoothed voltage (Uf) for the pump capacitor, whereby the smoothed voltage varies with a frequency (f) of at least 1 megahertz.

Abstract: The invention relates to a circuit arrangement in which each circuit component (15) is electrically connected to a conductor track (60) of a flexible conductor track support (6). The flexible conductor track support is arranged, together with the circuit components connected thereto, in a folded configuration inside an interior space (70) of a liquid-tight housing (7). This interior space is filled with a cooling liquid (8), which is not electrically conductive and is contact with all circuit components (15). This enables the circuit arrangement to be provided with a compact design while being relatively small, and all components, including the passive ones, are equally cooled. The invention is provided for use in lamp ballasts.

Abstract: To produce a mechanically firm glued connection between two surface regions of surfaces to be connected, a method is provided which provides each of the surfaces with surface regions having a peak-to-valley thickness of less than 0.3 &mgr;m and the surface regions are brought together in such a way that an intermediate space, which is filled with the glue, is produced therebetween and the space has a small average thickness of less than 0.31 &mgr;m and extends over a surface area of at least 20×20 &mgr;m2. The glue is preferably brought into the intermediate space by capillary action and contacts of high quality can be achieved with this method.

Abstract: The invention relates to a single-component adhesive system that consists at least of a casting resin, in particular of an epoxy casting resin, and a multivalent alcohol. The low-viscosity adhesive system can be microdosed, is stable in storage, is completely hardenable and is suitable for applications in which the dimensional tolerances are in the &mgr;m and sub-&mgr;m region.