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LED Street Light Envirnmental Factor
Jun 30, 2017

The characteristics of LED lighting materials to determine its greater impact on the environment, such as temperature changes, LED current will increase, the voltage increases, LED current will increase. Long over the rated current work, will greatly shorten the LED lamp life. The LED constant current is in the temperature and voltage and other environmental factors change, LED Street Light to ensure that its working current value unchanged.

Some of the power supply on the market constant current accuracy is poor, like the popular recommendation of the market and other constant current program, LED Street Light the error of ± 8%, LED Street Light constant current error is too large. General requirements in ± 3% on it. Press 3% of the design. Production power to be fine-tuned to achieve ± 3% error.

General LED recommended working voltage is 3.0-3.5V, tested, most of the work in 3.2V, so the calculation by 3.2V more reasonable. N lamp beads in series with the total voltage = 3.2 * N

General isolation power supply such as made 15W, on the LED lights in the power supply, the transformer size is very large, it is difficult to put in. Mainly to see the spatial structure, depending on the specific circumstances, the isolation can only be done in general 15W, LED Street Light more than 15W very little, and the price is very expensive

Therefore, the isolation of the price is not high, generally non-isolated accounted for more mainstream, the volume can be done smaller, the minimum can be high 8 mm, LED Street Light in fact, non-isolated security measures done, there is no problem. Space allows you to do isolation power supply.

(Such as 7X1WI> 350mA, or V <20V); LED Street Light or the current is too small, the voltage is too high (such as the current is too small, LED Street Light the voltage is too high (such as 7X1WI> 350mA, or V <20V); I <200mA or V> 25V), the result is severe heat, low efficiency, or insufficient input voltage range.

In fact, choose a best string and parallel way, added to each LED voltage and current is the same, and the power of the effect can play the best performance. LED Street Light The best way is to first communicate with the power supply manufacturers, tailor-made. Or own production power.

LED street lamp power bead series up to 45 string below is appropriate. Therefore, in order to get a relatively large power factor, the number of series of lamp beads can not be too little, otherwise it will not reach the best working condition, the number of isolated power supply in series with the number of secondary winding turns, must be done Power supply to meet the output power.

Electronic components in the rated voltage range of working current, the smaller the heat life of the longer life, the opposite will be shorter life. LED street lamp power beads are very sensitive to the exchange of weight, the higher the weight of communication, LED Street Light the worse the light comfort.

Generally use electrolytic capacitors to maintain the voltage, as far as possible to reduce the output voltage AC component, the bottom of the terminal electrolytic capacitor capacity can not be too small, the capacity and output current ratio of 1UF <1.5MA otherwise the LED will flash. Non-isolated input high-voltage electrolytic capacitor selection and isolation of the same, LED Street Light the output capacitor selection 1UF <6MA. Dimming LED power supply in the output electrolytic capacitor to meet 1UF <0.5MA.