Power amplifier circuit-based LED constant current output drive system

A power amplifier circuit and constant current output technology, applied in the field of electronics, can solve the problem of unable to output stable current, and achieve the effect of stable output current, wide application range, and improved load capacity

Inactive Publication Date: 2016-10-12
CHENGDU BAIMIAO NETWORK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Power amplifier circuit-based LED constant current output drive system

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Embodiment

[0017] Such as figure 1 As shown, the LED constant current output drive system based on the power amplifier circuit of the present invention is mainly composed of a processing chip U, a transistor VT2, a resistor R1, a capacitor C4, a protection circuit, a low-pass filter circuit, a gate drive circuit, a power amplifier circuit and Composition of current feedback circuit.

[0018] Wherein, the low-pass filter circuit is serially connected between the protection circuit and the processing chip U. The resistor R1 is connected in series between the collector of VT2 and the LD pin of the processing chip U. The anode of the capacitor C4 is connected to the emitter of the transistor VT2, and its cathode is connected to the RI pin of the processing chip U. The gate drive circuit is respectively connected to the GATE pin of the processing chip U and the low-pass filter circuit. The power amplifying circuit is connected with the gate driving circuit. The current feedback circuit is...

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Abstract

The invention discloses a power amplifier circuit-based LED constant current output drive system. The power amplifier circuit-based LED constant current output drive system is characterized by mainly comprising a processing chip U, a triode VT2, a protection circuit, a low-pass filter circuit, a resistor R1, a capacitor C4, a gate drive circuit, a current feedback circuit and a power amplifier circuit, wherein the low-pass filter circuit is connected between the protection circuit and the processing chip U in series; the resistor R1 is connected between a collector of the triode VT2 and an LD pin of the processing chip U in series; a positive electrode of the capacitor C4 is connected with an emitter of the triode VT2 and a negative electrode is connected with an RI pin of the processing chip U; the gate drive circuit is connected with a GATE pin of the processing chip U and the low-pass filter circuit separately; the current feedback circuit is connected between the gate drive circuit and a CS pin of the processing chip in series; the power amplifier circuit is connected with the gate drive circuit; and the protection circuit is also connected with a base of the triode VT2. By the power amplifier circuit-based LED constant current output drive system, the output power can be amplified; the load capability is greatly improved; and the application range is wider.

Description

technical field [0001] The invention relates to the field of electronics, in particular to an 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 driving system is easily affected by external facto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00H05B45/30H05B45/345
CPCH05B45/50H05B45/37Y02B20/30
Inventor 刘磊
Owner CHENGDU BAIMIAO NETWORK TECH CO LTD
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