ELECTRONIC ARRANGEMENT FOR ADJUSTING THE LIGHT INTENSITY OF AN ELECTRICAL DISCHARGE LAMP WITHOUT INCANDESCENT CATHODE
专利汇可以提供ELECTRONIC ARRANGEMENT FOR ADJUSTING THE LIGHT INTENSITY OF AN ELECTRICAL DISCHARGE LAMP WITHOUT INCANDESCENT CATHODE专利检索，专利查询，专利分析的服务。并且A circuit (IC1, R3-R11, C4-C6, D1) is provided for controlling the electrical energy applied to a gas discharge lamp without incandescent cathode, in view of a direct controlling voltage (U u). This circuit allows the modification of the time or the firing angle of a thyristor (TR1) inside each half-wave of the alternative voltage. In order to avoid complete unwanted extinction during the adjustment of a minimum light intensity of the lamp (20), a second circuit (30, 42, R12-20, C7, D3, T1) is provided which ensures a minimum current strength through the lamp (20) irrespective of the continuous controlling voltage (U u). The second circuit comprises a transformer (30) and a rectifier (42) generating an adjusting voltage (U u) which depends from the current strength in the lamp. Said voltage (U u) controls an electronically variable resistance (T1). The latter acts on the voltage which controls the firing angle when the current strength in the lamp drops below the minimum permitted, so that a continuous decrease of the current strength be automatically opposed. The arrangement is used for example for adjusting the light intensity of lighting facilities for rooms, streets and tunnels comprising mercury-vapor bulbs or high-pressure sodium-vapor tubes.，下面是ELECTRONIC ARRANGEMENT FOR ADJUSTING THE LIGHT INTENSITY OF AN ELECTRICAL DISCHARGE LAMP WITHOUT INCANDESCENT CATHODE专利的具体信息内容。
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