Centrally connected power supply system of LED display screen

Abstract

The invention discloses a centrally connected power supply system of an LED display screen, relating to the field of LED display screen power supply. The system comprises a three-phase terminal, a PFC module, a first end point, a second end point and an HV DC-DC module, wherein the three-phase terminal provides AC380V power supply for the PFC module; the PFC module converts the AC380V power supply into the DC600V high voltage of the first end point and the second end point to be output; the HV DC-DC module receives the DC600V high voltage of the first end point and the second end point and converts the DC600V high voltage into DC5V voltage to be output. The power supply system of the invention lowers the construction difficulty and cost of LED display screen power supply, improves whole screen efficiency, improves product competitiveness and continuously satisfies the high-end display requirements of the modern LED display screen on the premise of ensuring power supply safety; and in the display screen, the PFC module is intensively installed, thereby being convenient to maintain and install.

Description

technical field [0001] The invention relates to the field of power supply for LED display screens, in particular to a centralized power supply system for LED display screens. Background technique [0002] At present, under the traditional AC220V power supply mode, a distributed three-phase four-wire low-voltage power supply is generally used. The basic structure is as follows: figure 1 Shown by A-N(A 1 -A N ), B-N(B 1 -B N ) and C-N (C 1 -C N ) Three sets of internal power supply connections, with 220V high-voltage rectification. Inside the LED display, the application of a large number of rectification links makes the input current of the grid side a non-sinusoidal periodic current and consumes about 1% of the electric power. When the AC / DC (alternating current / direct current) power supply module is put into operation, it will inject a large number of high-order harmonics into the grid. Generally, there are two types of power distribution schemes, one is a low-cost ...

AI Technical Summary

Problems solved by technology

[0006] In the low-cost solution, in order to ensure the safety of power supply, the solution of increasing the diameter of the center line is adopted, but it will increase the difficulty and cost of engineering construction; in the high-cost solution, it only reduces the impact on the power grid, and does not reduce the construction difficulty and cost. Ensure power supply security

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