Traffic signal installation comprising LED-light source

A light source and power supply technology, applied in the field of LED light sources, can solve problems such as increased failure probability of power supply circuits, and achieve the effects of reduced continuous operating costs, halved maintenance costs, and improved efficiency

Inactive Publication Date: 2006-10-11
莫妮卡・西金尔
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Compared with the transformer power supply of LEDs selected in US-A-5,850,126 and DE 197 29 690 A1, this LED power supply has the obvious disadvantage that the probability of failure of the power supply circuit is significantly increased, which is due to the fact that it is used in traffic signals. Security reasons come with a big downside

Method used

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  • Traffic signal installation comprising LED-light source
  • Traffic signal installation comprising LED-light source
  • Traffic signal installation comprising LED-light source

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Embodiment Construction

[0058] figure 1 An LED light source 2 for a traffic signal device according to the invention is shown, which has a plurality of light-emitting diodes (LEDs) 4 connected in series, which in turn are connected in series with a coil 6 . A freewheeling diode 8 is connected in parallel with the LEDs and the coil 6 in such a way that the conduction direction of the freewheeling diode is opposite to that of the LEDs 4 . A fast electronic switch 10 is provided, which is supplied with a pulse sequence 14 by a pulse generator 12 , connected in series to the LEDs 4 , the coil 6 and the freewheeling diode 8 connected in parallel thereto. If these LEDs 4 are not used, but other consumers are used, such as halogen lamps, these lamps have no certain conduction direction, so a blocking diode can be additionally connected in series with the consumer, so that the conduction direction of the consumer is determined.

[0059] The fast electronic switch 10 itself can be, for example, a transistor ...

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Abstract

A traffic signal installation with an LED light source (2), comprising:an input (38, 40) for connection of a current source;furthermore, at potential levels between the upper potential (16) and the base potential (18):a plurality of LEDs (4) arranged in at least two series connections of several LEDs that are connected in parallel;a coil (6) provided in series with the LEDs (4);a recovery diode (8) provided in parallel to the LEDs (4) and the coil (6) and having its forward direction opposed to that of the LEDs (4); anda rapid electronic switch (10) provided in series with the LEDs (4), the coil (6) and the recovery diode (8) in parallel to the LEDs (4) and the coil (6); anda pulse generator (12) that is connected to the rapid electronic switch (12) and generates pulses that open and close the rapid electronic switch (10), said pulse generator (12) being a pulse-width modulator in particular in the form of an integrated component.

Description

technical field [0001] The invention relates to a traffic signal device with an LED (Light Emitting Diode) light source, and in particular to an LED light source which has a low-loss constant current supply for the LED. Background technique [0002] The use of traffic signal devices is expanding globally. In principle, the term "traffic signal device" is defined broadly in relation to the present application. This involves street and rail traffic signaling as well as the lighting of waterways and runways. For street traffic signal devices, in addition to typical signal devices, such as traffic lights, it also includes luminous traffic guidance systems and traffic signs. [0003] Such traffic signal installations are usually operated by regional or state-owned agencies, in which, besides the costs for the initial installation, the costs for operation and maintenance also play a significant role. In the case of such traffic signal installations using conventional incandesce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B39/04G08G1/095H05B44/00
CPCH05B45/10Y02B20/30H05B45/3725G08G1/095
Inventor 埃德蒙·福尔拉特
Owner 莫妮卡・西金尔
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