What are the technical characteristics of solar street light

The heat dissipation effect of solar street light is greatly affected by the surrounding environment. For example, when the temperature is high in summer, the current of the LED lamp will increase, and the voltage will also increase. Long-term operation exceeding the rated current will greatly reduce the life of the LED, and the LED constant current is When environmental factors such as temperature and voltage change, ensure that its operating current value remains unchanged. In this way, this problem can be solved. The effect of the radiator on the solar street light power supply, the constant current accuracy of the power supply, and the constant current accuracy of some power supplies on the solar street light market are poor. scheme, the error reaches ±8%, and the constant current error is too large. The general requirement is ±3%. According to the 3% design scheme. The production power supply needs to be fine-tuned to achieve ±3% error. The working voltage of the solar street light power supply The working voltage of the LED is 3.0-3.5V. After testing, most of them work at 3.2V, so the calculation formula of 3.2V is more reasonable. The total voltage of N lamp beads in series u003d 3.2*N, what is the working current of the solar street light power supply is the most suitable, such as the rated working current of the LED is 350 mA, some factories use it up at the beginning, and the design is 350 mA In fact, the working heat is very serious under this current. After many comparison tests, it is ideal to design 320 mA. Minimize heat generation and allow more electrical energy to become visible light energy. How wide should the series-parallel and wide voltage of the solar street light power supply board be? To make the solar street light power supply work in the range of AC85-265V with a wide input voltage range, the series-parallel mode of the LEDs of the light board is very important. Try not to use wide voltage, it can be divided into AC220V and AC110V as much as possible, so as to ensure the reliability of the power supply. There is also a wide voltage solution, 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 program is only used under certain conditions. Isolation/non-isolation Generally, if the isolated power supply is made of 15W and placed in the solar street light power supply tube, the transformer is very large and difficult to put in. It mainly depends on the space structure and depends on the specific situation. Generally, the isolation can only achieve 15W, and there are few more than 15W, and the price is very expensive. Therefore, the cost-effectiveness of isolation is not high. Generally, non-isolation is more mainstream, and the volume can be made smaller, and the minimum height can be 8 mm. In fact, there is no problem with non-isolation safety measures. It can also be used as an isolated power supply if space permits. How can the solar street light power supply match the lamp bead board? Some customers design the lamp board first, and then find the power supply. They find it is difficult to find a suitable power supply, or the current is too large and the voltage is too small (such as 7X1WI>350mA, or V<20V); or the current is too small and the voltage is too high (such as I<200mA or V>25V), resulting in serious heat generation, low efficiency, or insufficient input voltage range. In fact, if you choose an optimal series-parallel connection method, the voltage and current applied to each LED are the same, and the power supply can exert the best performance. The best way is to communicate with the power supply manufacturer first and customize it. Or produce your own power supply. LED series-parallel and PFC power factor The number of solar street light power beads in series should be up to 45 strings or less. Therefore, in order to obtain a relatively large power factor, the number of lamp beads in series should not be too small, otherwise the optimal working state will not be achieved. The number of series connections on the isolated power supply is related to the number of turns of the secondary winding. The power supply must meet the output power. The smaller the working current of electronic components within the rated voltage working range, the longer the heat and the longer the life, otherwise the life will be shorter. The solar street light power beads are very sensitive to the amount of AC, and the higher the amount of AC, the worse the light comfort. Generally, electrolytic capacitors are used to maintain the voltage, and the AC component of the output voltage should be reduced as much as possible. The capacity of the electrolytic capacitors at the bottom voltage end should not be too small, and the ratio of the capacity to the output current should be 1UF<1.5MA, otherwise the LED will flicker. The selection of high-voltage electrolytic capacitor at the input end of the non-isolated type is the same as that of the isolated type, and the selection of the capacitor at the output end is 1UF<6MA. The electrolytic capacitor at the output end of the dimming LED power supply should meet the requirements of 1UF<0.5MA. Solar street light power supply efficiency The input power minus the output power value, this parameter is particularly important, the larger the value, the lower the efficiency, which means that a large part of the input power is converted into heat and dissipated. Therefore, efficiency is the most fundamental factor in determining the life of the power supply. The efficiency cannot be too low, otherwise the heat consumed by the power supply will be too large. The efficiency of the non-isolated type is higher than that of the isolated type, generally more than 80%. However, the efficiency is related to the matching connection method of the lamp board.
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