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LED drive circuit

A LED drive and circuit technology, applied in electric light sources, electrical components, electroluminescent light sources, etc., can solve the problems of output current ripple, LED light flickering, etc.

Active Publication Date: 2016-07-20
ZHEJIANG YINGFEITE OPTOELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides an LED drive circuit to solve the problem of stroboscopic phenomenon of LED lights caused by large ripples in the output current in the prior art

Method used

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Embodiment Construction

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0040] The present invention provides an LED drive circuit to solve the problem of LED lamps flickering due to relatively large output current in the prior art.

[0041] Specifically, such as figure 1 As shown, the LED drive circuit includes: a current stabilization unit 101, a non-isolated DC / DC conversion unit 102, a feedback signal acquisition unit 103, a DC reference acquisition unit 104, and a voltage loop control unit 105; wherein:

[0042] The output t...

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Abstract

The application provides an LED drive circuit. The LED drive circuit is characterized in that a non-isolated DC / DC conversion unit and a current stabilization unit which are connected in series at an output end drive an LED load jointly, a voltage loop control unit controls the phases of the output voltage ripples of the non-isolated DC / DC conversion unit and the current stabilization unit to be inverse according to a sampling signal VS for representing an output voltage V2 of the non-isolated DC / DC conversion unit, a feedback signal VFB relevant with the output ripple of the current stabilization unit and a DC reference signal Vref positively related with the output ripple, and enables the output voltage average value of the non-isolated DC / DC conversion unit to change along with the output ripple of the current stabilization unit, thereby reducing or even eliminating the ripples on the LED load, avoiding the situation that an output current has larger ripples, so that an LED lamp generates a glitter phenomenon, and guaranteeing the stable circuit and the optimal efficiency.

Description

technical field [0001] The invention relates to the technical field of LED driving, in particular to an LED driving circuit. Background technique [0002] LED, as a new type of lighting device, is widely used in the field of lighting due to its high luminous efficiency, and it usually requires constant current drive. In the prior art, the LED driver used as its constant current drive is low in cost and simple in structure. characteristics, a single-stage scheme is often used. [0003] The LED driver using a single-stage scheme needs to take into account the PFC (PowerFactorCorrection, power factor correction) function, that is, its control loop needs a very slow response speed to have a high PF (PowerFactor, power factor) value. Therefore, its The control loop responds slowly, which causes the output current to have a large ripple whose period is half the period of the input AC voltage. When the LED driver is connected to the load, this current ripple will cause the LED la...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/14H05B45/44
Inventor 姜德来梅进光
Owner ZHEJIANG YINGFEITE OPTOELECTRONICS CO LTD
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