LED street lamp is a very important application in LED lighting.
On the premise of energy saving save electricity, the trend of LED street lamp to replace traditional street lamp is more and more obvious.
On the market, there are many kinds of LED street lamp power supply method.
The method of early comparative attaches great importance to the pursuit of low cost;
To the recent consensus gradually formed, high efficiency and high reliability is important.
This article is mainly aimed at several different applications of solar led street light
, put forward the suitable architecture, and analyzes their advantages and disadvantages, so that readers can according to specific conditions and methods of street lamp types, find a way to * right.
Method one: direct AC incoming, 6 were LED constant current control in this paper introduces several methods of this kind of method should be the * high efficiency, low cost circuit * (
With photoelectric coupler directly on primary side circuit back control, regulate the output voltage.
Compared with other traditional methods, this method is less switch loss.
Fix the CS voltage on 0.
25 v, were LED constant current control of six strings.
IC will detect the location of the FB, it * low voltage LED fixed at 0.
At this time due to the string of leds Vf value is the sum of the different, the pressure drop will fall on the MOS tube, lead to some loss.
If it is the general Vf points BIN the LED, after the screening loss should be controlled within 2%, less than the general switch loss.
This method has the advantage of high efficiency, low cost, the disadvantage is that AC incoming, need more research and development costs.
The method is suitable for AC could be used directly to the incoming street lamp.
Method 2: DC or battery incoming, to 6 were LED constant current control methods, it USES more list of booster structure similar to before a LED drive way, difference from AC to DC or by batteries incoming (
Low voltage side sensing method as long as selecting the appropriate MOS tube, LED to considerable number.
Relative to the AC incoming method, the method is relatively simple.
But due to the switch more a booster, efficiency is relatively low.
Method has the advantage of the method is simple, low cost of circuit, the disadvantage is low efficiency.
It is suitable for solar cells or by adapter incoming street lamp.
Method 3: single string step-down structure of some manufacturers still like to use a single string methods, advantage is easy of maintenance, and can do modular approach.
Different power of street lamp can use the same article lamp, as long as the replacement panel, with different amounts of light, can make all sorts of different power street lamps.
But its drawback is that each string need independent power supply module, cost is higher, and the structure of the step-down to withstand voltage of LED is limited by the number of IC.
In the example shown in figure 3, LED * string to 14, article if you want to approach 20 w lamp, LED will need to use the 700 ma.
In order to make the high efficiency reached *, it is necessary to regulate the incoming voltage on the number of leds, namely the output voltage of the adapter.
10 star LED, for example, if you want to achieve * high efficiency, it must turn into voltage to about 42 v.
This method has the advantage of high efficiency step-down structure, single string method, the configuration is more flexible and high cost disadvantage is circuit, LED series number is limited by IC pressure.
It is suitable for the street lamp method through the adapter into four: the same single string method, booster structure (
Will a step-down structure efficiency is low, but the number of leds in series is no longer restricted to IC pressure, but is determined by MOS, thus it can be more leds in series.
Because most of the solar cell output voltage is not high, so suitable for solar street lamps use booster structure.
And selects the current mode of constant current method, can make the output current is less affected by the incoming voltage change, the battery full and fast without electricity, can let the brightness of the street lamps to maintain the same.
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are an important part of the society and they come in handy in any place where there are custom made solar light
s in need of led street light manufacturers.
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