YUANNENGJI About heat dissipation, in order to make the LED street light power supply work in a relatively wide input voltage range of AC85-265V, the LED series-parallel connection mode of the light board is very important. Since the current power supply is generally a non-isolated step-down constant current power supply, when the required voltage is 110V, the output voltage cannot exceed 70V, and the number of series connections cannot exceed 23. When the input voltage is 220V, the output voltage can reach 156V, yani, the number of series connections cannot exceed 45. The number of parallel connections cannot be too large, otherwise the working current will be too large and the power supply will heat up seriously.
APFC active power compensation is to first use L6561/7527 to boost the voltage to 400V, and then step down the voltage, which is equivalent to two switching power supplies. This solution is only used under specific conditions. The characteristics of ED lighting materials determine that they are greatly affected by the environment. Örneğin, when the temperature changes, the current of the LED will increase, and the voltage will also increase. Long-term operation exceeding the rated current will greatly shorten the service life of the LED lamp beads. LED constant current is to ensure that the working current value remains unchanged when environmental factors such as temperature and voltage change.
1: For LED street lights, their design needs special attention. For manufacturers, the product structure design is relatively reasonable, but with the different environments and the continuous upgrading of products, the product structure will become more and more reasonable, so the heat dissipation and waterproof performance of LED street lights are difficult to guarantee, so for consumers, they must identify regular manufacturers.
2: Non-isolated, generally isolated power supply, such as 15W, is placed in the LED street light power supply tube. Its transformer is very large. Isolation can generally only do 15W. It is rare to exceed 15W, and the price is very expensive. Bu nedenle, the cost performance of isolation is not high. Generally, non-isolation is more mainstream, and the volume can be made smaller. Most non-isolation safety measures are well prepared, and there is no problem. If space permits, an isolated power supply can also be made.
3: The main factor of the heat dissipation solution is that the LED street lamp power bead can greatly extend its life without overheating. Generally, aluminum alloy is used, which is easier to dissipate heat and expand the external heat dissipation area as much as possible. Facing such a vast LED market, it is indeed full of vitality and can develop scientifically.
4: Try to use waterproof controllers to ensure long-term stability while preventing users from arbitrarily changing the lighting time. Because the wiring terminals are facing down and the wiring is bent into a U shape, this can prevent water from pouring into the controller from the line. Customers should be advised to use copper core wires of better quality. There will be a certain loss of current and voltage during the output process, which will not only increase power consumption, but also cause the LED driver power supply to fail to work properly in severe cases.
5: The characteristics of LED lighting materials determine that they are greatly affected by the environment. Örneğin, when the temperature changes, the current of the LED will increase. If it works for a long time exceeding the rated current, the service life of the LED lamp bead will be greatly shortened. LED constant current is to ensure that when environmental factors such as temperature and voltage change, its working current value remains unchanged.
6: Apply three primary colors or multi-color phosphors on purple or ultraviolet LED chips, and use the long-wave ultraviolet light or purple light emitted by the chip to excite the phosphors, thereby achieving white light emission. This type of LED has good color rendering, but there are similar problems to the second method, and the red and green phosphors with higher conversion efficiency are mostly sulfide systems.
7: There are three main methods for LED fluorescent lamps to use phosphors to achieve white light, but none of them are fully mature, which seriously affects the application of white light LEDs in the lighting field.