Power supply method and system of LED display screen

Abstract

The invention relates to a power supply method of an LED display screen, comprising the following steps of: firstly, carrying out alternating current-direct current rectification conversion on alternating current from an external alternating-current power supply and transmitting high-voltage and direct-current power obtained by conversion to a high-voltage and direct-current power supply bus; and then, respectively carrying out direct current-direct current voltage transformation on the voltage of the high-voltage and direct-current power supply bus according to working voltage required for each power consumption module on the LED display screen, and respectively inputting the transformed voltage to the corresponding power consumption modules of the LED display screen. The invention also relates to a power supply system of the LED display screen. The invention can improve power supply efficiency, reduce losses and lowering cost, simplify the structures of the power supply system and an application system thereof, improve the running reliability of the system, reduce the installation space required for the power supply system, and is convenient for wiring.

Description

technical field [0001] The invention relates to the field of LED display devices, in particular to a power supply method and system for an LED display screen. Background technique [0002] The LED display device includes the LED display and its power supply system. The LED display is a kind of LED display unit module assembled from dozens, hundreds or even more small sizes, which is used to display text, graphics and video. big screen. Each LED basic display unit module has the following basic features: a, has a certain number of LED light-emitting devices arranged in a plane lattice; b, has a control circuit for driving the LED light-emitting devices; c, has a signal interface connected to the outside and Power input interface; and, d, having a frame for installing the above-mentioned internal components such as a, b, c, and connecting members for assembling a large screen. Each LED basic display unit module needs a low voltage such as 3v-5v DC power supply. LED display ...

AI Technical Summary

Problems solved by technology

[0005] 1. The working efficiency of low-power AC / DC power supply modules is very low: at present, the efficiency of AC / DC power supply module products is mostly about 76%-82%, and the efficiency of AC / DC power supply module products with higher efficiency is rarely more than 84%.

Therefore, using a large number of low-power AC / DC power supply modules will cause a large energy loss

[0006] 2. Each independent AC / DC power module must have functions such as PFC, EMI filtering, and suppression of start-up surge current, which makes the cost of the power module very high, and because it is difficult to make the best use of everything, it will appear too wasteful resource

[0007] 3. Multiple independent AC / DC power supply modules are used to supply power to the LED display, resulting in a complex structure of the entire power supply system and its application system, and the use of many components also makes the reliability of the device operation relatively low

[0008] 4. The existing low-power AC / DC power module products are relatively large in size, occupying more effective installation space of the LED display device, and significantly increasing the material consumption of the LED display device rack and shell; The connection between them is longer, which increases the difficulty of wiring. When the load is heavy, the voltage drop of the line is relatively large, and even affects the dynamic characteristics of the load in severe cases.

[0009] 5. Due to the low working efficiency of the low-power AC / DC power module, the power module is seriously heated

This has caused great difficulties to users in the application of LED display screens, and also led to a significant increase in equipment costs and maintenance costs

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