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LED drive circuit

A LED drive and circuit technology, applied in the direction of electric light source, electrical components, electroluminescent light source, etc., can solve the problems of complex layout and high cost, and achieve the effect of reducing the number of components and stabilizing the output voltage

Active Publication Date: 2016-07-20
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, figure 1 The circuit shown has a high cost due to the large number of components, and the layout is more complicated in PCB design

Method used

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  • LED drive circuit
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Examples

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Embodiment Construction

[0015] Exemplary embodiments of the present invention will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts. The embodiments are described below in order to explain the present invention by referring to the figures.

[0016] figure 2 is a block diagram showing an LED driving circuit according to an exemplary embodiment of the present invention.

[0017] like figure 2 As shown, the LED driving circuit of the exemplary embodiment of the present invention includes: a first rectification and filtering circuit 10, a DC-AC conversion circuit 20 based on pulse width modulation, a second rectification and filtering circuit 30, an LED load 40, a current detection circuit 50, Feedback circuit 60 , pulse width modulation controller 70 . Here, the LED load 40 includes at least one LED string connected in parallel, and each LED string includes at least one LED connected in series.

[0018] ...

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Abstract

The invention provides an LED drive circuit comprising a first rectification and filtering circuit which performs rectification and filtering on input AC voltage so as to output first voltage; a DC-AC conversion circuit based on pulse width modulation which performs DC-AC conversion on first voltage based on a pulse width modulation signal so as to output second voltage; a second rectification and filtering circuit which performs rectification and filtering on second voltage so as to output third voltage to an LED load; a current detection circuit which respectively detects current of at least one LED string and outputs at least one feedback voltage which reflects current of each LED string in the LED load; a feedback circuit which generates and outputs a signal related to at least one feedback voltage and third voltage based on at least one feedback voltage and third voltage; and a pulse width modulation controller which generates the pulse width modulation signal according to the signal outputted by the feedback circuit. According to the LED drive circuit, the number of elements can be reduced.

Description

technical field [0001] The invention belongs to the technical field of LED driving, and more specifically relates to an LED driving circuit. Background technique [0002] At present, LED is widely used in various display lighting fields due to its advantages of energy saving and long life, such as: display screens, applications of traffic sign display light sources, applications of automotive indicator lights, applications of LCD (liquid crystal display) backlight sources, and indoor lighting applications. lighting applications, etc. In order to realize the advantages of LED, the design of LED driving circuit is particularly important. The existing LED drive circuit usually uses a traditional boost circuit to supply power to the LED load on the basis of a switching power supply (with the function of stabilizing the output voltage and making the load constant current), such as figure 1 As shown, among them, the switching power supply includes: a primary rectification and fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor ζŽζ–‡δΈœ
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD