Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
  • H05B41/14—Circuit arrangements
  • H05B41/36—Controlling
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
  • H05B41/14—Circuit arrangements
  • H05B41/36—Controlling
  • H05B41/38—Controlling the intensity of light
  • H05B41/39—Controlling the intensity of light continuously
  • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
  • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations

Definitions

• the present invention relates to a method of operating a lighting system comprising an electric lamp and an electronic ballast, wherein the operation of the electric lamp is adjusted by the electronic ballast. Furthermore, the present invention relates to a lighting system comprising an electric lamp and an electronic ballast.
• Lighting systems with electric lamps and electronic ballasts are known in many ways and are used in different situations and circumstances.
• power-controlled or current-controlled electronic ballasts it can in very narrow electrical lights or electric lamps, which are arranged in a relatively tight space, cause that these electric lamps can not be operated in its optimum operating.
• the associated reduced luminous flux leads to a relatively insufficient system luminous efficacy of the entire lighting system.
• amalgam lamps which in principle have a broad luminous flux optimum.
• the present invention is therefore based on the object to provide a method for operating a lighting system and a lighting system, which allows a more effective and efficient operation of an electric lamp even in relatively confined spaces.
• safe operation with a relatively high system efficiency should be ensured even at relatively high temperatures at the place of use of the electric lamp.
• a method according to the invention for operating a lighting system comprising an electric lamp and an electronic ballast
• the operation of the electric lamp is adjusted by this electronic ballast.
• An essential idea of the invention is that a measuring process characterizing an ambient temperature of the electric lamp is carried out, wherein at least one measured value is generated during the measuring process which is compared with a threshold value and an electric power of the electric lamp when the measured value deviates from the threshold value is changed. It can be achieved by the method according to the invention that effective and efficient operation of the electric lamp can be carried out even in very tight space conditions in which an electric lamp is arranged.
• a measuring operation is carried out in a relatively low-effort manner, which characterizes an ambient temperature of the electric lamp, wherein a deviation from an optimum threshold value and thus a deviation from an optimal operation can be adjusted again by the electric power of the electric Lamp is changed.
• the electrical power is advantageously reduced, in particular reduced in such a way that the measured value is adjusted to the threshold value.
• this can be detected relatively quickly by a corresponding measurement process and be reacted by reducing the electrical power to such hot ambient conditions, whereby it can be achieved that the electric lamp again with substantially their optimal operating conditions is operated. It can thereby be achieved that the system efficiency is again approximated to the optimum system efficiency and the luminous flux of the electric lamp is brought back to the optimum luminous flux.
• At least one lamp parameter can be measured over a predeterminable time period and compared with a stored characteristic curve of the corresponding lamp parameter.
• the measurement of a characteristic curve of the at least one lamp parameter and the comparison with a stored characteristic curve of this lamp parameter is carried out by means of a microprocessor. It can thereby be achieved that in an accurate and low-cost manner both the detection and the comparison and the initiation and implementation of appropriate measures for possibly necessary correction of the electrical lamp power can be performed.
• the lamp voltage and / or the lamp current and / or the lamp power can be used. It should be noted that these mentioned lamp parameters are merely exemplary and, instead of or in addition thereto, further parameters characterizing an electric lamp can be used for the method according to the invention.
• the measurement process characterizing the ambient temperature of the electric lamp determines the ratio of a measured electrical power to a luminous flux. It can be provided that this is carried out by means of a suitable light sensor.
• the measurement of the electrical power can be done via a microprocessor. In the alternatives explained above, it is thus not necessary to directly measure the ambient temperature of the electric lamp as a parameter itself
• an ambient temperature in the vicinity of the electric lamp and / or a temperature at the electric lamp itself is measured at the measurement process characterizing the ambient temperature of the electric lamp.
• a suitable temperature sensor or a temperature sensor can be provided in a preferred manner. This temperature sensor or temperature sensor can be mounted in the electric lamp.
• An inventive lighting system comprises an electric lamp and an electronic ballast.
• the operation of the electric lamp is adjustable by the electronic ballast.
• An essential idea of the invention is that the illumination system has means with which a measuring process characterizing an ambient temperature of the electric lamp can be carried out, wherein the means are designed such that at least one measured value can be generated during the measuring process, which is compared with a threshold value and when the measured value deviates from the threshold value, an electric power of the electric lamp can be changed.
• An illumination system has an electric lamp which is connected to an electronic ballast and whose operation is set via the electric ballast.
• the illumination system comprises a microprocessor, which is designed such that lamp parameters of the electric lamp can be detected.
• the device-internal microprocessor is designed such that it can measure at least one lamp parameter, in particular the lamp current and / or the lamp voltage over a presettable period of time and compares the measured characteristic of the lamp parameter with a threshold value characteristic stored in the microprocessor, referred to below as reference characteristic. This reference characteristic or threshold characteristic characterizes doing an optimal operation of the electric lamp.
• the microprocessor is determined to what extent the measured characteristic deviates from the reference line, from which an excessively high ambient temperature, in which the electric lamp is detectable. Due to the time characteristic of the measured characteristic curve, a distinction can be made between extremely low and very high temperatures, since here the lamp parameters can be very similar. If an excessively high ambient temperature is detected by comparing these abovementioned characteristic curves, the microprocessor is furthermore embodied such that the electric power of the electric lamp is reduced in such a way that an approximation to an optimum system efficiency is achieved. An indicator that an approximation to the optimum system efficiency takes place can be detected, for example, by a rising lamp voltage. In addition, by such a reduction in the electrical power of the electric lamp in addition to the setting of a re-optimized system efficiency and the luminous flux of the electric lamp in turn brought to its optimum.
• the ambient temperature can be determined via the ratio of measured power to luminous flux, with the luminous flux advantageously being effected by means of a light sensor and the measured power can be detected via a microprocessor.
• the corresponding temperature or the corresponding temperatures are measured by means of a temperature sensor.
• an electric lamp was operated with different electrical powers and to illustrate the above alternatives of the invention, both the ambient temperature, and the temperature at the lamp, and the lamp power and the lamp current and the lamp voltage measured.
• the relative luminous flux and the relative efficiency of the electric lamp was determined.
• the value of the relative luminous flux and the relative efficiency at an ambient temperature of 70 ° C may be mentioned.
• the relative efficiency can be increased by 36% to 136% with a relatively low luminous flux reduction from a little bit 2% to 97.8%.

Landscapes

• Circuit Arrangement For Electric Light Sources In General (AREA)
• Circuit Arrangements For Discharge Lamps (AREA)

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Cited By (1)

Citations (2)

• 2006
  • 2006-06-01 EP EP06011382.6A patent/EP1732363A3/fr not_active Withdrawn

Patent Citations (2)

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