Stroboflash-free sectional type constant-current LED driving circuit

A LED driving, segmented technology, applied in the field of LED lighting, to achieve the effect of improving efficiency, increasing current operating frequency, and facilitating product commercialization

Inactive Publication Date: 2016-07-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems in the above-mentioned prior art, the main purpose of the present invention is to solve the problem of 100HZ stroboscopic flickering in the existing segmented constant current LED drive circuit

Method used

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  • Stroboflash-free sectional type constant-current LED driving circuit
  • Stroboflash-free sectional type constant-current LED driving circuit
  • Stroboflash-free sectional type constant-current LED driving circuit

Examples

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Effect test

Embodiment 1

[0029] See image 3 , The segmented constant current LED drive circuit without flicker includes LC low-pass filter circuit 1, rectifier filter circuit 2, bridge inverter circuit 3, LC resonance filter circuit 4 and segmented constant current LED drive circuit 5, which is characterized by : The power supply is connected to the segmented constant current LED drive circuit 5 through the LC low-pass filter circuit 1, the rectifier filter circuit 2, the bridge inverter circuit 3, and the LC resonance filter circuit 4 in turn; the bridge inverter circuit can increase the frequency of the AC signal Features: By increasing the operating frequency of the input signal of the segmented constant current LED driving circuit, the function of LED load without flicker is realized on the basis of maintaining the characteristics of the segmented constant current LED driving circuit.

Embodiment 2

[0031] See Figure 4 , This non-flicker-free segmented constant current LED drive circuit includes an LC low-pass filter circuit 1, a rectifier filter circuit 2, a half-bridge inverter circuit 3, an LC series parallel resonant circuit 4 and a segmented constant current LED drive circuit 5 in series. .

[0032] The LC low-pass filter 1 can prevent high-frequency current from flowing into the AC input side, filter out higher harmonics, and reduce harmonic pollution to the power grid; the rectifier filter circuit 2 converts the input AC power into a DC power with a relatively smooth waveform; the half-bridge inverter circuit 3 converts the DC signal into a high-frequency square wave signal through the chopping of the switch tube; the LC series-parallel resonance circuit 4 has better filtering characteristics, The high-frequency square wave signal can generate a high-frequency near-sine wave signal through the LC series-parallel resonant network; the input signal of the segmented LED...

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PUM

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Abstract

The invention relates to a stroboflash-free sectional type constant-current LED driving circuit. The stroboflash-free sectional type constant-current LED driving circuit comprises an LC low-pass filtering circuit, a rectification filtering circuit, a bridge inversion circuit, an LC resonance filtering circuit and a sectional type constant-current LED driving circuit. The sectional type constant-current LED driving circuit is enabled to have quite high versatility and adaptability, and the application scope of a sectional type driving scheme in the field of LED illumination is expanded.

Description

technical field [0001] The invention belongs to the technical field of LED lighting, and in particular aims at an AC direct drive LED drive circuit, and proposes a segmented constant current LED drive circuit directly driven by AC without flicker. Background technique [0002] LED is the fourth generation lighting source. LED has the characteristics of energy saving, environmental protection, high efficiency, and safety, so it is widely used in lighting occasions such as landscapes, street lamps, and electronic product backlights. With the application of LED lighting in many occasions, the design of mature and efficient LED driving power is a crucial link in LED lighting. [0003] LED lamps have strict requirements on the driving power supply, and the LED driving circuit uses constant current to drive the LED load to work. Although the traditional two-stage drive circuit scheme can achieve high drive performance, it has the disadvantages of many devices, large size of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37Y02B20/30
Inventor 刘廷章潘超邹雅君
Owner SHANGHAI UNIV
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