Constant-current drive circuit applicable to LED screen

Abstract

The invention discloses a constant-current drive circuit applicable to an LED screen. The constant-current drive circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a diode, a first voltage stabilizing diode, a second voltage stabilizing diode, a photoelectric coupler, a DC (direct current) switch converter and a bridge rectifier circuit. The first end of the fifth capacitor is connected with the first AC (alternating current) input end of the bridge rectifier current and positive voltage. The second end of the fifth capacitor is connected with the second AC input end of the bridge rectifier circuit and negative voltage. According to the arrangement, a low-end buck converter of the constant-current drive circuit of the LED screen can provide 130 mA constant current and 70 V DC output voltage under the AC input voltage between 90 V and 132 V; the constant-current drive circuit is applicable to driving the constant-current-driven LED screen; the first capacitor reduces conductive electromagnetic interference, the bridge rectifier circuit provides full-wave rectification, the second capacitor maintains stable DC bus voltage, and normal display of the LED screen is guaranteed.

Description

technical field [0001] The invention relates to a driving circuit, in particular to a constant current driving circuit suitable for LED display screens. Background technique [0002] With the progress of the society, the traditional teaching methods can not meet the growing technology, now in addition to the traditional teaching methods, most schools have begun to adopt a variety of new teaching methods, among which multimedia computer-aided teaching is the most widely used teaching method Multimedia computer-aided instruction refers to the use of multimedia computers to comprehensively process and control symbols, language, text, sound, graphics, images, video and other media information, and to organically combine various elements of multimedia according to teaching requirements and pass them on the screen. Displayed, at the same time add the cooperation of sound as needed, as well as the human-computer interaction between the user and the computer, to complete the teachin...

AI Technical Summary

Problems solved by technology

[0002] With the progress of the society, the traditional teaching methods can not meet the growing technology, now in addition to the traditional teaching methods, most schools have begun to adopt a variety of new teaching methods, among which multimedia computer-aided teaching is the most widely used teaching method Multimedia computer-aided instruction refers to the use of multimedia computers to comprehensively process and control symbols, language, text, sound, graphics, images, video and other media information, and to organically combine various elements of multimedia according to teaching requirements and pass them on the screen. Displayed, at the same time add the cooperation of sound as needed, as well as the human-computer interaction between the user and the computer, to complete the teaching or training process, so the LED display is a very important equipment in multimedia-assisted teaching, and its stable and lasting work It is especially important to change the current. If the current is unstable, it may cause the LED screen to flicker continuously, causing certain damage to the LED screen.

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