Abstract:
Die vorliegende Erfindung betrifft eine Projektionsvorrichtung mit mindestens einer Entladungslampe, sowie einer Steuervorrichtung zum Ansteuern der Entladungslampe. Dabei ist die Steuervorrichtung dazu ausgelegt, mindestens eine Basis-Stromwellenform (WF 0 ) zur Ansteuerung der Entladungslampe bereitzustellen. Weiterhin weist die Projektionsvorrichtung eine Messvorrichtung zur Ermittlung eines zu einer Zustandsgröße der Entladungslampe korrelierten Messwerts auf. Erfindungsgemäß ist die Steuervorrichtung dazu ausgelegt, basierend auf mindestens einem Messwert der Messvorrichtung die Stromwellenform (WF i ) hinsichtlich ihrer Eignung zur Minimierung eines Elektrodenrückbrands zu prüfen und dementsprechend die geprüfte Stromwellenform (WF i ) beizubehalten oder einen angepassten Kommutierungsvektor (K i+1 ), welcher eine angepasste Stromwellenform (WF i+1 ) kennzeichnet, zu erzeugen. Sie betrifft überdies ein entsprechendes Verfahren zum Betreiben der Projektionsvorrichtung.
Abstract:
Described is dynamic control of the temperature of the envelope of an HID lamp (30) in order to stabilize the output color temperature of the lamp. As the lamp power is changed, or environmental factors alter the lamp envelope temperature, the system senses these changes and adjusts the lamp cooling systems (42a, 42b) so as to move the lamp envelope temperature back to the desired point.
Abstract:
A ballast circuit for a lighting system using an induction fluorescent lamp utilizes an AC-DC rectification circuit, a DC-DC boost power conversion circuit, a DC-AC half bridge inverter circuit, and a resonating circuit to ignite the lamp and maintain substantially constant power output of the lamp, while the DC-AC half bridge inverter circuit is further comprised of a gate isolation transformer connected in a half bridge inverter schematic which uses a ballast integrated circuit (IC) to drive a high side MOSFET and a low side MOSFET and the gate isolation transformer electrically isolates a gate signal to the high side MOSFET.
Abstract:
A UV system (100) for irradiating a substrate includes a RF source (102) capable of generating RF energy, a UV lamp (105) capable of emitting UV energy when excited by the RF energy generated by the RF source, and a monitor (114) coupled to the RF source. The monitor includes data relating to the RF source. The UV system further includes a controller (116) capable of communication with the monitor, and the controller determines if the RF source is suitable for operation with the UV system based on the data of the monitor and/or has reached the end of its useful life.
Abstract:
Die Erfindung betrifft eine Vorrichtung zur Überwachung und Steuerung von Wasserdesinfektionsanlagen mit wenigstens einem in einem Kanal (100) angeordneten Breitband-UV-Strahler (101), wobei die Vorrichtung wenigstens einen Sensor (103) aufweist, der in dem Wasser in einem Abstand von dem Breitband-UV-Strahler (101) angeordnet ist, und wobei der Sensor (103) mit einer Regeleinheit (104) verbunden ist, die zur Regelung der Leistung des Breitband-UV-Strahlers (101) oder des Volumenstroms an Wasser durch den Kanal (100) eingerichtet ist, wobei der Sensor (103) ein Empfindlichkeitsmaximum für UV-Strahlung in einem Wellenlängenbereich zwischen 200 nm und 240 nm aufweist.
Abstract:
The present invention relates to a field emission lighting arrangement, comprising an anode structure at least partly covered by a phosphor layer, an evacuated envelope inside of which an anode structure is arranged, and a field emission cathode, wherein the field emission lighting arrangement is configured to receive a drive signal for powering the field emission lighting arrangement and to sequentially activate selected portions of the phosphor layer for emitting light. The same control regime may be applied to an arrangement comprising a plurality of field emission cathodes and a single field emission anode. Advantages with the invention includes increase lifetime of the field emission lighting arrangement.
Abstract:
The invention relates to an electronic ballast having an interface having input connections (E1, E2) to which an impedance can be connected, wherein the circuit configuration is able, due to the variability of a frequency, to capture measurement values from which the resistance and the capacitance of elements simultaneously connected to the connections (E1 and E2) can be derived. Using both of said derived parameters, other parameters can be determined, particularly two items of information can be transmitted to the electronic ballast. An item of information to be transmitted is preferably a dimming duration, namely the duration for which a lamp connected to the electronic ballast is to be operated in dimming mode.