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A constant current circuit for LCD TV

A technology of constant current circuit and LCD TV, which is applied in the field of constant current circuit, can solve the problems of high cost and complex circuit, and achieve the effect of low cost, simple circuit and improved production efficiency

Active Publication Date: 2019-09-20
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Using this method to provide constant current drive requires the use of additional chips, the circuit is complex and the cost is high

Method used

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  • A constant current circuit for LCD TV
  • A constant current circuit for LCD TV
  • A constant current circuit for LCD TV

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Embodiment Construction

[0011] 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 creative efforts fall within the protection scope of the present invention.

[0012] figure 1 It is a schematic structural diagram of a constant current circuit for a liquid crystal television according to an embodiment of the present invention. like figure 1 As shown, the constant current circuit 10 includes a rectification and filtering circuit 11 , a PFC circuit 12 , an LLC circuit 13 and a feedback circuit 14 .

[0013] The rectification and filtering circuit 11 is used to receive an AC input and perform rectification and filtering to ...

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Abstract

The invention discloses a constant current circuit for liquid crystal television. The circuit includes: a rectifying and filtering circuit for receiving an AC input and performing rectification and filtering to provide a first DC voltage; a PFC circuit for receiving the first DC voltage and performing power factor correction to output a second DC voltage; an LLC circuit for using for receiving the second DC voltage and outputting corresponding constant current currents in a plurality of output channels respectively under the driving of the second DC voltage; the feedback circuit is used for adjusting the output of the LLC controller in the LLC circuit when the constant current current fluctuates duty cycle to keep the constant current constant. Through the above method, the present invention can realize the constant current circuit in a relatively simple manner, which is beneficial to improve the production efficiency of the LCD TV.

Description

technical field [0001] The invention relates to the field of liquid crystal televisions, in particular to a constant current circuit for liquid crystal televisions. Background technique [0002] In LCD TVs, some drive circuits such as LED drive circuits need to use constant current drive. In order to achieve constant current drive, the prior art method is to use an external constant current drive chip and its peripheral circuits to provide constant current drive. [0003] Using this method to provide constant current drive requires the use of an additional chip, and the circuit is complicated and the cost is high. Contents of the invention [0004] The technical problem mainly solved by the present invention is to provide a constant current circuit for a liquid crystal television, which can provide constant current drive in a relatively simple manner. [0005] In order to solve the above-mentioned technical problems, a technical solution adopted by the present invention i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
Inventor 杨勇刘方云
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD