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LED constant-current output drive system based on transistor oscillating circuit

An oscillation circuit, 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 stabilizing oscillation frequency, improving stability, and stable driving performance

Inactive Publication Date: 2016-07-27
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 transistor oscillating circuit

Method used

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  • LED constant-current output drive system based on transistor oscillating circuit
  • LED constant-current output drive system based on transistor oscillating circuit

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Embodiment

[0018] Such as figure 1 As shown, the LED constant current output drive system based on the transistor oscillating 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 transistor oscillating circuit, a low-pass filter circuit, a gate drive circuit and Composition of current feedback circuit.

[0019] 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 transistor oscillating circuit is connected in series between the negative electrode of the capacitor C4 and 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 current feedback circuit is connected in series between the gate drive circuit and the ...

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Abstract

The invention discloses an LED constant-current output drive system based on a transistor oscillating circuit, characterized by mainly comprising: a processing chip U, a triode VT2, a capacitor C4, a protective circuit, a low-pass filter circuit serially connected between the protective circuit and the processing chip U, a resistor R1 serially connected between a collector of VT2 and an LD pin of the processing chip U, a transistor oscillating circuit serially connected between a negative electrode of the capacitor C4 and an RI pin of the processing chip U, a gate drive circuit connected with both a GATE pin of the processing chip and the low-pass filter circuit, and a current feedback circuit serially connected between the gate drive circuit and a CS pin of the processing chip U; the protective circuit is also connected with a base of the triode VT2; a positive electrode of the capacitor C4 is connected with an emitter of the triode VT2.Compared with existing LED drive systems, the system of the invention can provide stable oscillation frequency so that drive performance of the system is more stable.

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 transistor oscillator 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...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00Y02B20/30
Inventor 刘磊
Owner CHENGDU BAIMIAO NETWORK TECH CO LTD
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