Configuration and selection of full-color LED screen power supply


"Configuration and selection of power supply for full-color LED screens" power supply is an important part of LED screen components. The stability, protection, performance, power, and wiring of LED power supplies have a profound impact on the quality of LED screens, and the power supply structure must be waterproof. , Moisture-proof, the shell should be light-resistant, it is best to increase the negative feedback of the LED screen temperature in the constant current output to prevent the LED chip temperature from being too high and cause the LED screen to age faster. LED is a semiconductor device with sensitive characteristics and has negative temperature characteristics. Therefore, it needs to be stabilized and protected during the application process, thus generating the concept of driving. Because it is limited by the power level of the LED, it is usually necessary to drive multiple LEDs at the same time to meet the brightness requirements of the full-color LED screen. Therefore, a professional driving power supply is required to light up the LED screen. So what are the requirements that need to be considered when choosing an LED drive power supply: 1. Protective measures The life of the drive power supply should match the life of the LED screen, and it must meet the requirements of installation rules and electromagnetic compatibility. The power supply structure should be waterproof and moisture-proof, and the shell should be light-resistant. It is best to increase the negative feedback of the LED screen temperature in the constant current output to prevent the full-color LED screen from aging due to the high temperature of the LED chip. 2. Surge protection The ability of LED screens to resist surges is relatively poor, especially the ability to resist reverse voltage, so it is also very important to strengthen protection in this regard. Due to the sway of the grid load and the induction of lightning strikes, various surges will invade from the grid system, and some surges will cause damage to the LED screen lamp beads. Therefore, the LED drive power supply must suppress the intrusion of surges and protect the LED module The ability of the group not to be damaged. 3. High efficiency Since the LED screen is an energy-saving product, the efficiency requirements of the driving power supply will be relatively high. This is especially important for structures where the power supply is installed inside the screen. Because the luminous efficiency of the LED screen will decrease with the increase of the LED temperature, the heat dissipation problem of the LED screen is very important. If the efficiency of the power supply is higher, its power consumption will be smaller, and the heat generated in the screen will be smaller, which reduces the temperature of the screen and is beneficial to delaying the light decay of LEDs. 4. The first driving method: one constant voltage source supplies multiple constant current sources, and each constant current source supplies power to each LED screen independently. Advantages: flexible combination, if a certain LED fails, it will not affect the normal operation of other LEDs. Disadvantages: The cost will be slightly higher. The second type: direct power supply with constant current, so that the LED screen circuits can run in series or in parallel. Pros: The cost is slightly lower. Disadvantages: Poor flexibility. If a certain LED fails, the first thing to do is to solve the problem that it does not affect the operation of other LED screens. .

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