led lighting professional lighting project is not only affected by the global environment, but also has its professional specificity. The led street light power supply is precisely the top priority of the current LED development. Regarding the relevant planning of the LED technology, there are currently a variety of plans and common planning methods, let's take a look one by one.
1, solar led street light What is the most suitable operating current for the power supply?
has an additional operating current of 350 milliamperes, for example It was used up at the beginning, planning 350 mA. In fact, the operating temperature is very severe under this current. After repeated comparison experiments, it is planned to be 320 mA. Minimize the amount of heat generated, so that more electrical energy becomes visible light energy.2. Why must the solar LED street lamp power supply have a constant current?
led , for example, if the temperature of the led is greatly affected by the environment The current of the LED will increase, and the increase of the voltage will increase the current of the led. Exceeding the extra current operation for a long time will greatly shorten the service life of the LED lamp beads. The LED constant current is to ensure that its operating current value remains unchanged when environmental factors such as temperature and voltage change.
3. How wide is the series-parallel connection and wide voltage of the solar led street light board?
To make the led street light wider than the 85-scale input voltage of the power supplyThen the LED serial and parallel method of the light board is very important. Try not to use wide voltages, and divide ac220v and ac110v into categories as much as possible, so as to ensure the reliability of the power supply. Because the current power supply is usually a non-blocking step-down constant current power supply, when the required voltage is 110v, the output voltage should not exceed 70v, and the number of series connections should not exceed 23 strings. When the input voltage is 220v, the output voltage can reach 156v. In other words, the number of series does not exceed 45 series. Do not connect too many in parallel, otherwise the operating current will be too large and the power supply will generate severe heat. There is also a wide voltage plan, apfc active power compensation is to use l6561/7527 to raise the voltage to 400v first, and then step down, which is equivalent to two switching power supplies. This plan is only used under certain conditions.
4. solar led street light power supply constant current accuracy 1span 1span 0 Referral plans and other constant current plans have an error of ±8%, and the constant current error is too large. Usually the requirement is within ±3%. According to the 3% planning plan. The production power supply needs to be fine-tuned to achieve ±3% error.
5. LED series and parallel connection and pfc power element
barrier input ac220v high voltage end electrolytic capacitor _span4acv1w = uf2, usually the current capacity of the input market power 1w = 1uf2 The power supply PFC has three conditions:
One is without pfc without power factor compensation circuit,The pf value is usually around 0.65;
Two types are passive power factor compensation pfc circuits, that is, passive power factor compensation lamps, also called current-by-current circuit boards, which are currently the most widely used and most reliable Well, the pf value is usually around 0.92;
There are three other types of lighting projects that use active active 7527/6561 circuits, that is, active power factor compensation, which is called ac220v and ac110v in the apfc circuit Electrolytic capacitors of the same capacity can be used, and 1w=1.5uf can be used. The pf value can reach 0.99, but the cost of this plan is twice as expensive as the second plan, and the reliability is slightly worse.
6. The operating voltage of the solar led street light power supply
Usually the recommended operating voltage for leds is 3.0-3.5v. After testing, most of the operating voltage is 3.2v, so according to the 3.2v calculation formula Cf. reasonable. The total voltage of n lamp beads in series=3.2*n.
7. How can the power supply of the led street light be matched with the lamp bead board?
Some customers have planned the lamp board first, and then found it difficult to have a suitable power supply. The current is too large and the voltage is too small (such as 7x1wi>350ma, or v<20v);>25v). The result is severe heat generation, low power, or input The voltage scale is not enough. Originally, choose one of the best serial and parallel connection methods, the voltage and current applied to each led is the same,But the role of the power supply can perform the best function. The best way is to communicate with the power supply manufacturer first and tailor it. Or produce their own power supply.
8. Barrier/non-barrier
is usually difficult to put in a power supply tube such as a 15w led power supply. The space structure depends mainly on the specific conditions. The barrier can usually only be 15w, and there are very few surpassing 15w, and the price is very expensive. Therefore, the cost-effectiveness of barrier is not high. Usually the right and wrong barriers occupy more mainstreams, and the volume can be made smaller, with a minimum height of 8 mm. In fact, the non-blocking safety measures are in place and there is no doubt. . Power can also be blocked if space permits.
The above is the relevant knowledge about the content analysis of the top ten knowledge points of solar LED street lamp skills. If you have related questions, you can consult us Xi'an Baijia Lighting Electrical Engineering Co., Ltd.
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