Ten points for attention of LED Street Lighting
1, LED Street Lighting power must be constant flow
The lighting properties of LED Street Lighting determine their environmental impact, such as the increase in temperature, then the LED current will be increased; such as long-term over the rated current and work, but also will greatly shorten the life of LED lamp bead. LED constant flow is in the temperature and voltage and other environmental factors change, but also to ensure that the current value of the work is unchanged.
2. Constant current precision of LED Street Lighting power supply
The constant current precision of the power supply on the market is poor, the error can reach Shing and the constant current error is too large. General requirements in the Shing can be. Press the 3% design plan. Production power to fine-tune to achieve Shing error.
3, LED Street Lighting power supply operating voltage
The recommended working voltage of the general LED is 3. $number. 5V, tested, most of the work at 3.2V, so press 3.2V calculation is more reasonable. Total voltage $literal in series of n lamp beads. 2
4, LED Street Lighting power supply Current is how much is the most suitable
For example, the LED rated working current 350 MA, some factories used to the start, the design of 350 ma, in fact, the current work in the heat is very serious, after repeated experiments, designed to 320 Ma is more ideal. Try to reduce the calorific value, let more electricity become visible energy.
5, LED Street Lighting Power Plate series-parallel and wide voltage to how wide?
To make the LED Street Lighting power work in a wide range of input voltage range Ac85-265v, then the LED series-parallel mode is very important. Try not to use wide voltage, can be divided into $literal, Ac110v as far as possible classification, so as to ensure power reliability. Because the current power supply is generally not isolated step-down type constant current power supply, in the requirements of 110V voltage, the output voltage should not exceed 70V, serial number of not more than 23 strings. Input voltage 220V output voltage can reach 156V. That is, the concatenation count does not exceed 45 strings. The number of parallel not too much, otherwise the work current is too big, the power supply is hot. There is also a wide voltage scheme, APFC active power compensation is to first use L6561 7527 to raise the voltage to 400V, and then step-down, equivalent to two switching power supply. The scheme is used under certain conditions.
General isolation power supply such as 15W, placed in the LED Street Lighting power pipe, its transformer volume is very large, difficult to put in. Mainly looking at the spatial structure, depending on the specific circumstances, the isolation of the general can only do 15W, more than 15W of little, and the price is very expensive. Therefore, the isolation of the cost-effective, generally non-segregation of the mainstream more, the size can be done smaller, the smallest can be achieved high 8 mm, in fact, the non-segregation security measures are done, there is no problem. Space allowed can also be isolated power.
7, LED Street Lighting power to how can do with the lamp bead plate match?
In fact, choose the best string and connect the way, plus on each led voltage current is the same, and the effect of the power can play the best performance. The best way is to communicate with the power supplier first, tailor-made. or self production power.
8, LED Street Lighting power efficiency
Input power minus output power value, this parameter is particularly important, the greater the efficiency of the lower the value, means that the input power is a large part of the heat emitted out; if it is installed in the lamp will produce a very high temperature, coupled with our led by a luminous effect than the heat emitted, will be superimposed to produce a higher temperature. The life of all electronic components in our power supply will be shortened with the increase of temperature. So efficiency is the most fundamental factor to determine the power supply life, the efficiency can not be too low, otherwise consumption in the power of the heat is too large. Non-isolation efficiency is higher than the isolation, generally more than 80%, however, efficiency and the matching method of the lamp plate.
9, LED street light source cooling
The main factor of the heat dissipation scheme is the LED Street Lighting light bead in but the heat condition use can greatly prolong the life, generally uses the aluminum alloy, is more easy to dissipate heat. That is, LED Street Lighting power beads affixed to the aluminum substrate, the outside as far as possible to expand the heat dissipation area.
10, LED Street Lighting power dissipation
The main factor of the heat dissipation is the LED Street Lighting power supply bead in but the heat condition use can greatly prolong the life, generally uses the aluminum alloy radiator, is more easy to dissipate heat. That is, LED Street Lighting power beads affixed to the aluminum substrate, the outside as far as possible to expand the heat dissipation area.
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