Digital regulation of fluorescent lamps
January 9, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesFluorescent lamp power control Solid state ballast system for metal halide lighting using fuzzy logic control Dimmable compact fluorescent lamp Gas discharge lamp controller Light sensing dimming control system for gas discharge lamps Pipelined oversampling A/D converter Method and apparatus for controlling minimum brightness of a fluorescent lamp Digital lamp signal processor Patent #: 6337544 InventorApplicationNo. 042572 filed on 01/09/2002US Classes:315/291, CURRENT AND/OR VOLTAGE REGULATION315/224, Impedance or current regulator in the supply circuit315/307, Automatic regulation315/308, Regulator responsive to plural conditions315/362, ELECTRIC SWITCH IN THE SUPPLY CIRCUIT341/110, ANALOG TO DIGITAL CONVERSION FOLLOWED BY DIGITAL TO ANALOG CONVERSION341/143Differential encoder and/or decoder (e.g., delta modulation, differential pulse code modulation)ExaminersPrimary: Philogene, HaissaAttorney, Agent or FirmForeign Patent References
International ClassG05F 001/00Foreign Application Priority Data2002-01-03 EPAbstractA method to control the illumination intensity of a gas discharge lamp is achieved. The method comprises, first, converting an analog lamp illumination signal into a digital lamp illumination signal. The analog lamp illumination signal is a function of the illumination intensity of a gas discharge lamp. Second, digital target signal is subtracted from the digital lamp illumination signal to create a digital error signal. Third, a digital frequency set point is adjusted from a current value to a new value based on the digital error signal. The digital frequency set point is a high resolution digital value. Fourth, the current value and the new value are averaged by a digital delta sigma modulator to create a smoothed frequency set point. The smoothed frequency set point is a medium resolution value. Finally, an oscillating voltage signal is generated with a drive frequency based on the smoothed frequency set point. The drive frequency determines the illumination intensity of the gas discharge lamp.Field of SearchCURRENT AND/OR VOLTAGE REGULATIONAutomatic regulation Regulator responsive to plural conditions ELECTRIC SWITCH IN THE SUPPLY CIRCUIT REGULATION OF THE CONTROL CURRENT AND/OR POTENTIAL APPLIED TO DISCHARGE CONTROL DISCHARGE DEVICE LOADS BY PHASE SHIFTING MEANS Impedance or current regulator in the supply circuit Pre-selectable regulator systems ANALOG TO DIGITAL CONVERSION FOLLOWED BY DIGITAL TO ANALOG CONVERSION ANALOG TO OR FROM DIGITAL CONVERSION Multiplex Differential encoder and/or decoder (e.g., delta modulation, differential pulse code modulation) Digital to analog conversion Analog to digital conversion | |
