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LED constant current drive circuit and LED lighting device

A technology of constant current drive and LED light strings, which is applied in the direction of lighting devices, electric light sources, electrical components, etc., can solve the problems of no flicker-free LED, large power frequency ripple of output current, etc., to eliminate flicker phenomenon, The effect of eliminating influence

Active Publication Date: 2016-09-28
SHENZHEN SUNMOON MICROELECTRONICS
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide an LED constant current drive circuit and an LED lighting device, aiming to solve the problem that the existing high power factor LED drive circuit cannot realize LED flicker-free due to the large power frequency ripple of the output terminal current. question

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  • LED constant current drive circuit and LED lighting device
  • LED constant current drive circuit and LED lighting device
  • LED constant current drive circuit and LED lighting device

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Embodiment Construction

[0015] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0016] The LED constant current drive circuit provided by the embodiment of the present invention is a high power factor flicker-free LED drive circuit, including a constant voltage control module, a feedback control module, and a constant current drive module. The feedback control module samples the output voltage of the LED light string , and compare the sampling voltage with the preset reference voltage and output the first control voltage and constant voltage after processing. The constant voltage control module makes the output voltage of the LED light string equal to the preset reference volta...

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Abstract

The invention belongs to the field of LED driving control and provides a LED constant current drive circuit and a LED lighting apparatus. The LED constant current circuit is a LED drive circuit having high power factor and no stroboscopic effect. The LED constant current drive circuit includes a constant voltage control module, a feedback control module and a constant current drive module. The feedback control module samples an output voltage of a LED string light, compares the sample voltage with a preset benchmark voltage, and outputs a first control voltage and a constant voltage after performing processing. The constant voltage control module enables the output voltage of the LED string light to be equal to the preset benchmark voltage based on the first control voltage. The constant current drive circuit conducts constant current control on currents passing by the LED string light based on the constant voltage. The LED constant current drive circuit eliminates effects on the LED string light imposed by power frequency of the current of an output end of current regular high power LED drive circuits, and further eliminates stroboscopic phenomenon of LEDs.

Description

technical field [0001] The invention belongs to the field of LED drive control, in particular to an LED constant current drive circuit and an LED lighting device. Background technique [0002] Currently, LED (Light Emitting Diode, Light Emitting Diode), as a new type of light source, has been widely used in various fields due to its advantages of low energy consumption, high brightness and long service life. LED is a typical current-mode device, which has high requirements on the stability of the working current. If there is a power frequency ripple in the current used to drive the LED, it will cause the LED to appear stroboscopic phenomenon, and people work in the stroboscopic environment for a long time. Under the light source, it will cause visual fatigue. [0003] The existing flicker-free LED drive circuit is to rectify and filter the alternating current input into the power grid into direct current to drive the LED, so as to realize the flicker-free LED, but because t...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor 李照华林道明胡乔
Owner SHENZHEN SUNMOON MICROELECTRONICS
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