Abstract: LED electronic display
is a kind of current control device, LED driver is actually the driving power supply of LED, that is, a circuit device that converts AC power to constant current or constant voltage DC power. Unlike ordinary incandescent bulbs, led electronic displays can be directly connected to 220V AC mains. LED's requirements for driving power supply are almost harsh, and its working voltage LED electronic display is a current control device. LED driver is actually the driving power supply of LED, that is, a circuit device that converts AC power to constant current or constant voltage DC power. Unlike ordinary incandescent bulbs, led electronic displays can be directly connected to 220V AC mains. The requirements of LEDs on the driving power supply are almost harsh, and its working voltage is generally 2~3V DC voltage, and a complicated conversion circuit must be designed. LED lights for different purposes should be equipped with different power adapters. LED devices have very high requirements for the conversion efficiency, effective power, constant current accuracy, power supply life, and electromagnetic compatibility of the LED drive power. A good drive power must take these factors into account, because the drive power is in the entire LED lamp. The role is as important as the human heart. The main task of the LED driver is to convert the AC voltage into a constant current DC power supply, and at the same time complete the matching of the voltage and current of the LED. Another task of the LED driver is to control the load current of the LED at a pre-designed level under the influence of various factors. LED electronic display light is conditional. The forward voltage is applied to both ends of the PN junction, so that the PN junction itself forms an energy level (actually a series of energy levels), and electrons jump at this energy level and generate photons to emit light. Therefore, the voltage applied across the PN junction is required to drive the LED to emit light. Furthermore, because LEDs are characteristic-sensitive semiconductor devices with negative temperature characteristics, they need to be stabilized and protected during application, which leads to the concept of LED driving. Anyone who has been in touch with LEDs knows that the forward volt-ampere characteristics of LEDs are very steep (the forward dynamic voltage is very small), and it is more difficult to supply power to the LED. It cannot be directly powered by a voltage source like ordinary incandescent lamps. Otherwise, the voltage With a slight increase in fluctuation, the current will increase to the point that the LED will be burned out. In order to stabilize the working current of the LED and ensure that the LED can work normally and reliably, various LED drive circuits have emerged. LED unit board, LED module wholesale, electronic display
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