Electrical circuit for an LED signal lamp with a s

专利名称：Electrical circuit for an LED signal lamp with a

switching threshold for switching between adaylight operation mode and a nighttimeoperation mode

发明人：Klose, Bernd申请号：EP05292461.0申请日：20051118公开号：EP1787886B1公开日：20080102

摘要：An electrical circuit (1, 21) for operating a signal lamp (5), with a signal lamp (5)comprising at least one light emitting diode (D3, D4, D5, D6), with a voltage input (V1) forsupplying the electrical circuit (1, 21) with AC voltage, and with a diode (D1) connected inseries with the voltage input (V1), is characterized in that the electrical circuit (1, 21)comprises a first subcircuit (11) connecting the cathode (4) of the diode (D1) with thesignal lamp (5), that the electrical circuit (1, 21) comprises a second subcircuit (12a, 12b)providing a low resistance current path (R6, R7, Q1) in parallel to the signal lamp (5), ascompared to the signal lamp (5), when the AC voltage is below a first critical level, thatthe electrical current (1; 21) comprises a third subcircuit (13) disabling the low resistancecurrent path (R6, R7, Q1) in parallel to the signal lamp (5), as compared to the signal lamp(5), when the AC voltage is above the first critical level, and that the electrical circuit (1,21) comprises a fourth subcircuit (14) providing a low resistance connection (M1, R3, R4)from cathode (4) of the diode (D1) to the signal lamp (5), as compared to the firstsubcircuit (11), when the AC voltage is above a second critical level (scl). The inventive

electrical circuit allows an adaptation of the luminous intensity by varying the AC inputvoltage.

申请人：ALCATEL TRANSP SOLUTION D GMBH

地址：DE

国籍：DE

代理机构：Kohler Schmid Möbus

更多信息请下载全文后查看