Dimmable LED constant-current output driving system based on power amplifying circuit

Abstract

The invention discloses a dimmable LED constant-current output driving system based on a power amplifying circuit. The dimmable LED constant-current output driving system is characterized by mainly comprising a processing chip U, an audion VT2, a protective circuit, a low-pass filter circuit, a linear dimming circuit, a resistor R1, a capacitor C4 and a gate drive circuit, wherein the low-pass filter circuit is connected between the protective circuit and the processing chip U in series; the linear dimming circuit is connected between the protective circuit and the base of the audion VT2 in series; the resistor R1 is connected between the collector of the audion VT2 and the LD pin of the processing chip U in series; the anode of the capacitor C4 is connected with the emitter of the audion VT2; the cathode of the capacitor C4 is connected with the RI pin of the processing chip U; and the gate drive circuit is respectively connected with the GATE pin of the processing chip U and the low-pass filter circuit. According to the dimmable LED constant-current output driving system disclosed by the invention, the brightness of an LED can be adjusted according to requirements; compared with the traditional LED driving system, the dimmable LED constant-current output driving system disclosed by the invention has better linearity when the brightness of the LED is adjusted; therefore, the LED is steadier to work; and the flicker phenomenon can be avoided.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a dimming type LED constant current output driving system based on a power amplifier circuit. Background technique [0002] At present, due to the characteristics of low energy consumption, long service life, safety and environmental protection, LED lamps have become one of the mainstream products for people's living lighting. With the popularity of LEDs and the continuous improvement of people's requirements for lighting effects, new challenges have been brought to LED drive systems. However, the traditional LED drive system is easily affected by interference factors, which makes it unable to output a stable current, which affects the normal operation of the LED to a large extent, and even damages the LED in severe cases. Contents of the invention [0003] The purpose of the present invention is to overcome the defect that the traditional LED drive system is easily affected by exte...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect that the traditional LED drive system is easily affected by external factors, resulting in its inability to output stable current, and to provide a dimming-type LED constant current output drive system based on a power amplifier circuit

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