LED street light power source design of the four kinds of solutions and compared

LED street light power source design of the four kinds of solutions and compared

LED street lighting is a very important applications. Energy saving in the premise of LED street light, street lamp to replace traditional the trend is more and more obvious. On market street, LED the design of the power supply is DuoZhong. The early design more attention to low cost pursuit; To the near consensus, grew, high efficiency and high reliability is the most important.

This paper is mainly aimed at several different LED lamp, put forward for the application of the structure, and the analysis of the advantages and disadvantages, so that readers can according to the specific conditions and design the lamps of the species, find the right solution.

Plan 1: direct AC input for six string were LED constant-current control

In this paper, several solutions of this scheme is the highest efficiency should be the lowest cost of scheme, circuit (figure 1). Use directly to primary side photoelectric coupler circuit back control, adjust output voltage. Relative to other traditional scheme, the scheme of less switch loss. Will the voltage fixed in CS 0.25 V, LED to six string were constant current control.
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Plan 2: DC or battery input, 6 were LED to string constant-current control

It USES more of the boost of structure design, LED the way before driving with a similar difference is that, by AC to DC input or by battery input (figure 2). Low voltage side of the design of the sensor as long as the choice of appropriate MOS tube, LED can string of quite a number of a number. Relative to AC input scheme, and its design are relatively simple. But because of a boost switch, the efficiency is lower.
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Plan 3: single string of antihypertensive structure

Some manufacturers still like to use the design of the single series, the advantage is maintenance easy, and can do the modular design. The lamps of the different power can use the same article lamp, as long as replacement panel, plug in different Numbers of lamp, can the article combination of different power street lamp. But its defect is each string all need independent power supply module, cost is higher, and the structure of the buck will let LED by limited to the number of the IC compression.
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Plan 4: single string of the boost RT8480 structure

The same single string of design, structure of the boost (figure 4) will be a step-down structure of the low efficiency, but LED to the number of the series of IC limited to no longer withstand, but by MOS to decide, and therefore can be series more LED. Since most of the solar battery output voltage is not high, so solar street lamps suitable for use the boost structure.
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The table below to LED street light four power design program of the advantage is compared and sequencing.


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