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Electrical circuit for LED signal lamp with switching threshold

A technology of signal lights and diodes, applied in railway signals, visual signals, electroluminescent light sources, etc., can solve problems such as expensive and troublesome

Inactive Publication Date: 2010-01-13
阿尔卡特传输方案德国股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It's quite expensive and cumbersome

Method used

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  • Electrical circuit for LED signal lamp with switching threshold
  • Electrical circuit for LED signal lamp with switching threshold
  • Electrical circuit for LED signal lamp with switching threshold

Examples

Experimental program
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Embodiment Construction

[0034] figure 1A schematic circuit diagram of an inventive signal lamp arrangement comprising two inventive circuits 1 , 21 is shown. Circuits 1, 21 are connected in parallel with opposite polarity to common voltage input V1. Voltage input V1 provides a sinusoidal alternating current (AC) at a voltage of approximately 6V to 12V (peak voltage). With this voltage, the intensity of light emission can be controlled. For simplicity, only the operation of the upper circuit 1 is described in detail; however, the lower circuit 21 operates identically with the other half-wave of the AC voltage. The reference designation of circuit 21 corresponds to the reference designation of circuit 1 with a number less than 20 (ie resistor R3 in circuit 1 corresponds to R23 in circuit 21).

[0035] A diode D1 connected in series to the lower electrode 2 of the voltage input V1 acts as a unidirectional rectifier. The cathode 4 of the diode D1 and the upper electrode 3 of the voltage input V1 prov...

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PUM

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Abstract

An electrical circuit for operating a signal lamp, with a signal lamp comprising at least one light emitting diode, with a voltage input for supplying the electrical circuit with AC voltage, and with a diode connected in series with the voltage input, is characterized in that the electrical circuit comprises a first subcircuit connecting the cathode of the diode with the signal lamp, that the electrical circuit comprises a second subcircuit providing a low resistance current path in parallel to the signal lamp, as compared to the signal lamp, when the AC voltage is below a first critical level, that the electrical current comprises a third subcircuit disabling the low resistance current path in parallel to the signal lamp, as compared to the signal lamp, when the AC voltage is above the first critical level, and that the electrical circuit comprises a fourth subcircuit providing a low resistance connection from cathode of the diode to the signal lamp, as compared to the first subcircuit, when the AC voltage is above a second critical level. The inventive electrical circuit allows an adaptation of the luminous intensity by varying the AC input voltage.

Description

technical field [0001] The invention relates to a circuit for operating a signal light, having: a signal light comprising at least one light emitting diode; a voltage input for supplying the circuit with an AC (alternating current) voltage; and a diode connected in series with the voltage input. Background technique [0002] A circuit of this type is known from US2005 / 0151665A1. [0003] Signal lights are used in a variety of fields, especially in traffic applications. Of particular importance are railway signals. These signals are used to indicate to train drivers whether it is safe to enter an upcoming section of railway track (such as a track switch). [0004] During daytime, the light of a railway signal must be bright enough for a train driver to recognize the state of the signal long before reaching the signal. During the night, however, the luminous intensity of the signal light must be low enough that the train driver is not dazzled. This means that the luminous ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08B61L5/18B61L9/04H05B44/00
CPCH05B33/0845H05B33/0842B61L2207/02B61L5/1881H05B45/10H05B45/00H05B45/3574
Inventor 贝恩德·克洛泽
Owner 阿尔卡特传输方案德国股份有限公司