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Buck converter for railway LED (Light Emitting Diode) signal lamp

A technology of converters and signal lamps, which is applied in the direction of electric lamp circuit layout, lighting devices, light sources, etc., and can solve the problems of many components, signal lamps no longer emitting light, and high cost

Inactive Publication Date: 2012-05-16
许欣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of the serial driving method is that after one of the LEDs is damaged, the entire signal light will no longer emit light.
Each LED is independently configured with a constant current Buck driver. The disadvantages are that there are many components, high cost, and occupying too much PCB area.

Method used

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  • Buck converter for railway LED (Light Emitting Diode) signal lamp
  • Buck converter for railway LED (Light Emitting Diode) signal lamp

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Embodiment Construction

[0011] The present invention adopts the solution of buck converter technology and NPN transistor constant current to drive a single LED junction, 10 LEDs with a rated current of 250mA are connected in parallel, and a single power LED adopts a constant current drive circuit.

[0012] The constant voltage Buck converter adopts an integrated Buck controller LM2679 with an output peak current up to 8.1A and an adjustable output voltage. The integrated Buck controller LM2679 includes a peak current overload protection adjustment resistor, a soft-start capacitor, an output capacitor, and a freewheeling converter. Diode input capacitor, filter inductor, output voltage feedback network.

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Abstract

The invention provides a Buck converter with high conversion efficiency, long service life and favorable stability for a railway LED (Light Emitting Diode) signal lamp and relates to a constant voltage Buck converter technology. In the Buck converter provided by the invention, the solution of combining the constant voltage Buck converter technology with constant current drive of a single LED by an NPN transistor is adopted; and the Buck converter is structurally characterized in that ten LEDs with the rated current of 250mA are connected in parallel; and a single power LED adopts a constant current drive circuit.

Description

Technical field: [0001] The invention relates to a constant voltage Buck converter technology, in particular to a Buck converter for railway LED signal lamps. Background technique: [0002] The development of new light-emitting diode (LED) solid-state light-emitting (SSL) products with higher energy efficiency and stronger functions is developing rapidly, and has made revolutionary progress in the lighting market. In many vertical applications such as signal lights, automotive, LCD TV backlighting, etc. LEDs have become an undisputed replacement for traditional light sources. The application of high-power LEDs in railway signal lights has the characteristics of energy saving and environmental protection. In order to meet the requirements of the railway signal light system, the LED lighting power supply has special properties such as high conversion efficiency, long service life, and good stability in harsh environments. A buck converter for railway LED signal lights is de...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 许欣
Owner 许欣
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