| Patent application number | Description | Published |
|---|
| 20090026983 | Lighting Device and Display System with a Lighting Device - A lighting device ( | 01-29-2009 |
| 20100026211 | Circuit Arrangement for Operation of Discharge Lamps, and Method for Operation of Discharge Lamps - A circuit arrangement for operating a discharge lamp, wherein the circuit arrangement comprises a commutation device, which has an input which is coupled to a DC source, and has an output which can be coupled to a discharge lamp. The commutation device is designed in such a way that it couples the DC source to the output, and the polarity at which the DC source is coupled to the output can be commutated by a control device. The control device has a sync input, and the polarity of the DC source is commutated in synchronism with sync pulses of a sync signal which can be applied at the sync input. The control device has a measuring input, which is coupled to a measuring device which is designed to provide a measured value which is a measure of the size of electrode peaks. The control device suppresses at least one commutation if the measured value overshoots or undershoots a predetermined threshold value. | 02-04-2010 |
| 20100045196 | CIRCUIT ARRANGEMENT FOR FIRING A DISCHARGE LAMP - A circuit arrangement for starting a discharge lamp, comprising: a first and a second input terminal for connecting an input voltage; an inverter, which has an input and an output, the input being coupled to the first and the second input terminal; a first and a second output terminal for connecting the discharge lamp; a resonant inductor, which is coupled between the output of the inverter and the first output terminal; a resonant circuit, which comprises the resonant inductor; a regulating apparatus for regulating the frequency of the signal provided at the inverter output; and a current measuring apparatus, which is arranged so as to measure a current which is correlated with the current in the resonant circuit, wherein the regulating apparatus is adapted to regulate the frequency at the output of the inverter as a function of the measured current. | 02-25-2010 |
| 20100079735 | Circuit Arrangement and Method for Operating a High-Pressure Discharge Lamp - A circuit arrangement ( | 04-01-2010 |
| 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 |
| 20100270934 | CIRCUIT ASSEMBLY AND METHOD FOR OPERATING A HIGH PRESSURE DISCHARGE LAMP - A circuit arrangement for operating a high-pressure discharge lamp with an operating circuit for the high-pressure discharge lamp with an input for receiving a switch-on/switch-off signal for the high-pressure discharge lamp and at least one output for providing an operating signal to the high-pressure discharge lamp, wherein the operating circuit is designed to reduce the power of the operating signal provided at the at least one output once a switch-off signal has been received at its input, wherein the operating circuit furthermore designed to provide the operating signal as an AC signal above a predeterminable power threshold value and as a quasi DC signal below the predeterminable power threshold value. | 10-28-2010 |
| 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 |
| 20110163685 | Lamp End of Life (EOL) Detection Circuit - A lamp driver circuit to selectively energize one or more lamps is provided. The inverter circuit has a transformer with primary and secondary windings to provide voltage to the lamps. A filter is connected to the primary winding to receive a primary winding signal representative of the voltage across the primary winding. The primary winding signal has a frequency spectrum and the filter detects a particular characteristic of the frequency spectrum that is indicative of an end of life (EOL) condition of the one or more lamps. A control circuit is connected to the inverter circuit and to the filter. The control circuit is configured to discontinue energizing of the one or more lamps by the inverter circuit when the particular characteristic of the frequency spectrum of the primary winding signal is detected by the filter. | 07-07-2011 |
