Selective energy-saving circuit of LED full-color screen

Abstract

The invention relates to a selective energy-saving circuit of an LED full-color screen. The selective energy-saving circuit comprises a 220V AC-to-24V DC power supply, a 24V DC-to-5V DC step-down circuit, a control unit, an LED driving unit, an LED display unit, a 24V DC-to-4V DC step-down circuit, a 24V DC-to-2.7V DC step-down circuit and a selection circuit, wherein the DC voltage output end ofeach step-down circuit is connected with an LED in the LED display unit through the selection circuit. Generally, the selection circuit outputs a 4V voltage to supply power the blue and green LEDs and outputs a 2.7V voltage to supply power the red LED; and under special circumstances, the selection circuit outputs a 5V voltage to supply power to all the LEDs. The selective energy-saving circuit reduces the energy consumption of the LED full-color screen, reduces the failure of the LED, prolongs the working life of the LED full-color screen and can maintain the LED brightness when the LED is aged.

Description

Technical field [0001] The invention relates to a selectable energy-saving circuit for an LED full-color screen. Background technique [0002] At present, the general LED full-color screen uses a fixed output voltage of 5V power supply module to directly supply power to each drive chip and red, green, and blue LEDs. Although this design simplifies the driving circuit, because the red, green and blue LEDs can achieve normal light-emitting voltages are different, the use of a unified voltage of 5V to power the red, green and blue LEDs will bring Unnecessary loss will also affect the normal light-emitting life of the LED, and it is easy to cause some LEDs to die. Summary of the invention [0003] The purpose of the present invention is to provide a selectable energy-saving circuit for LED full-color screens, which allocates different power supply voltages to red LEDs, green LEDs and blue LEDs according to the different power supply voltage requirements of each color LED, thereby red...

AI Technical Summary

Problems solved by technology

Although this design simplifies the driving circuit, since the red, green and blue LEDs require different voltages to achieve normal light emission, using a unified voltage of 5V to power the red, green and blue LEDs will bring It will cause unnecessary loss, and it will also affect the normal luminous life of the LED, which will easily cause the dead light of some LEDs.

Images