DC supply mode of LED street lamp

Abstract

The invention relates to a DC supply mode of an LED street lamp and belongs to the field of low-voltage power supply and distribution. A DC power supply system comprises a DC power station composed of a street lamp transformer (1), a rectifier filter (2) and a reactive power compensator (3), a DC transmission line, an LED street lamp driving power supply (4) and the like. With the advancement of the LED light source technology, the service life of the light source exceeds 50, 000 hours, the consumption of electric energy is lower than one half of that of a conventional light source, the LED street lamp technology gradually comes into practice, and the LED light source is more and more widely used; the working mode of the conventional LED street lamp is as follows: each lamp is provided with a driving power supply for converting alternating current into direct current, so that the LED light source emits light; the single-phase rectifier, the filter capacitor and the PFC (power factor correction) circuit in the power supply are the bottleneck of popularization and application of the LED street lamp due to shorter service life besides harmonic pollution; and to fully exert the advantages of the LED light source with energy conservation and long service life, the invention provides a solution for DC supply mode of the LED street lamp, electric energy is provided for the LED street lamp by the DC supply mode, and the rectifier bridge, the filter capacitor and the PFC circuit in the conventional power supply are saved, so that the purpose of long-term secure and reliable operation of the LED street lamp is achieved.

Description

Technical field: [0001] The invention belongs to the field of low-voltage power supply and distribution, and provides a solution to a DC power supply system for LED street lamps. Background technique: [0002] At present, the commonly used electric light sources for urban street lamps are mainly high-pressure sodium lamps, metal halide lamps, high-pressure mercury lamps and incandescent lamps, and their working power supply adopts AC 220V. figure 1 It is a schematic diagram of the power supply of the transformer dedicated to street lamps at present, in which phase A is used to supply street lamps on both sides, and phase B and C are respectively used to supply street lamps on one side. [0003] With the technological progress of high-power light-emitting diode LED light sources, LED street lights have gradually entered the practical stage. The service life of the LED light source exceeds 50,000 hours, which is at least 10 times that of other traditional light sources. After...

AI Technical Summary

Problems solved by technology

[0008] The energy storage high-voltage electrolytic capacitor C that must be configured in the rectification filter and PFC circuit has a short service life, generally no more than 5000 hours, resulting in a short service life of the LED street lamp power supply in addition to generating a large number of harmonics, which limits the overall service life of the LED street lamp

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