Patent application number | Description | Published |
20100171434 | CIRCUIT ARRANGEMENT FOR OPERATING DISCHARGE LAMPS AND METHOD FOR OPERATING DISCHARGE LAMPS - A circuit arrangement for operating a discharge lamp is provided. The circuit arrangement may include a commutating device, which is configured to exhibit an input which is coupled to a direct-current source and has an output which can be coupled to a discharge lamp; the commutating device being configured in such a manner that it couples the direct-current source to the output and the polarity with which the direct-current source is coupled to the output can be commutated by a control device; the control device including a measurement input which is coupled to a measuring device which is configured to deliver a measurement value which is a measure of the magnitude of a lamp voltage; wherein the control device is configured to control the commutating device in such a manner that the polarity at which a higher lamp voltage prevails is coupled longer to the output. | 07-08-2010 |
20100295462 | ELECTRONIC BALLAST AND METHOD FOR CONTROLLING AT LEAST ONE LIGHT SOURCE - An electronic ballast for driving at least one light source may include an input for connecting a supply voltage; an output configured to connect the at least one light source; an oscillator, which is designed to provide an oscillator output signal with a first frequency at its output, the oscillator having a calibration input in order to alter the first frequency; and a microcontroller configured to provide a drive signal with at least one spectral component at a second frequency for the at least one light source, the microcontroller being coupled to the oscillator output and being designed to generate the second frequency as a function of the first frequency; wherein the electronic ballast furthermore includes a drive circuit, which is coupled to the calibration input, the drive circuit being designed to vary the first frequency during running operation of the electronic ballast via the calibration input. | 11-25-2010 |
20100295467 | CIRCUIT ARRANGEMENT AND METHOD FOR REGULATING THE CURRENT THROUGH AT LEAST ONE DISCHARGE LAMP - A circuit arrangement for the closed-loop control of the current through at least one discharge lamp may include a control loop including: a setpoint value input for supplying a setpoint value; an actual value input for supplying an actual value; and an output for providing a signal, which has been correlated with the current through the at least one discharge lamp, the actual value having been correlated with the value of the current through the discharge lamp; and a setpoint value input apparatus, which is designed to provide the setpoint value to the control loop; wherein the setpoint value input apparatus includes: a microprocessor with at least one input, the microprocessor being designed to couple the at least one input to a potential from a group of at least two different potentials; and a wiring apparatus with at least one input, which is coupled to the at least one input of the microprocessor, and at least one output, which is coupled to at least one point of the control loop. | 11-25-2010 |
20100295480 | Method for the Operation of and Circuit Arrangement for Light Sources - A method for the closed-loop control of the operation of a light source which is supplied with power by a DC/DC voltage converter, a manipulated variable being regulated by a setpoint value for an operational parameter of the DC/DC voltage converter being input, wherein the method comprises the steps of: increasing the switching frequency of the DC/DC voltage converter by an increase value prior to rapid changes in the setpoint value; waiting for a retention time; setting the new setpoint value; waiting for the end of a total retention time; and lowering the switching frequency of the DC/DC voltage converter by the increase value. | 11-25-2010 |
20110043692 | VIDEO PROJECTION SYSTEM AND SYNCHRONIZATION METHOD - In a video projection system, an operating device ( | 02-24-2011 |
20110310361 | METHOD AND ELECTRONIC OPERATING DEVICE FOR OPERATING A GAS DISCHARGE LAMP AND PROJECTOR - A method for operating a gas discharge lamp may include; the gas discharge lamp is operated using an intermittently constant lamp current, whose time-relative average value of the frequency is predetermined by the lamp voltage of the gas discharge lamp in the steady state, wherein the lamp current has predefined commutation points in the temporal course, and a commutation for generating a commutation pattern can take place at these commutation points, wherein the time-relative average value of the frequency of the lamp current is adjusted by means of a variation of the commutation pattern. | 12-22-2011 |
20110317133 | METHOD AND ELECTRONIC OPERATING DEVICE FOR OPERATING A GAS DISCHARGE LAMP AND PROJECTOR - A method for operating a gas discharge lamp featuring a gas discharge lamp burner and a first and a second electrode, wherein the electrodes have a nominal electrode separation in the gas discharge lamp burner before their first activation and said nominal separation is correlated to the lamp voltage. The method may include checking whether the off-time, corresponding to the time duration between two DC voltage phases, has expired; and if the off-time has expired, omitting commutations or applying pseudo-commutations for a predefined time duration which depends on the lamp voltage in such a way that a time duration of the omission of at least one of commutations and application of pseudo-commutations is predefined for each lamp voltage. | 12-29-2011 |
20120195009 | Electronic Product Having a Double-PCB Sandwich Structure and a Method of Assembling the Same - An electronic product having a double-PCB sandwich structure includes a PCB assembly, and a casing having an open side. The electronic product is configured such that a protuberance is respectively formed on the inner sides of two side walls of the casing in the longitudinal direction, the PCB assembly comprises an electronic component, a base PCB and a main PCB, the length of the base PCB and the length of the main PCB in the longitudinal direction of the casing are substantially equal to each other and slightly smaller than the length of the casing so that the PCB assembly can be installed into the casing by mating with the protuberances. | 08-02-2012 |