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led backlight drive circuit

A technology of backlight drive circuit and boost circuit, which is applied in the direction of light source, electric light source, electrical components, etc., can solve the problems of increasing cost, and achieve the effects of improving boost efficiency, good practicability, and reducing cost

Inactive Publication Date: 2011-12-21
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the number of LEDs increases and the load becomes larger, it is necessary to use multiple sets of Boost circuits instead of a single set of Boost circuits to supply power to the LEDs, which increases the cost

Method used

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Embodiment Construction

[0030] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0031] refer to figure 2 , the present invention proposes an embodiment of an LED backlight driving circuit 10 . The LED backlight driving circuit 10 supplies power for the LED backlight module (not shown), and it includes: a voltage stabilizing circuit 11, a first voltage boosting circuit 12, a second voltage boosting circuit 13 and a selection control circuit 14; the voltage stabilizing circuit 11. Receive an input voltage, filter the input voltage, and output a regulated DC power; the first boost circuit 12 receives the regulated DC power, boosts it and outputs it to the LED backlight module; the second boost circuit The circuit 13 receives the regulated direct current, boosts it and outputs it to the LED backlight module; the selection control circuit 14 alternately selects the first boost circuit 12 and the sec...

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PUM

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Abstract

An LED backlight driving circuit (10) capable of supplying power to an LED backlight module comprises: a voltage stabilizing circuit (11), for receiving and filtering an input voltage and outputting a voltage-stabilized direct current; a first boost circuit (12) and a second boost circuit (13), respectively connected to the voltage stabilizing circuit (11), for receiving and boosting the voltage-stabilized direct current and outputting the boosted voltage-stabilized direct current to the LED backlight module; and a selection control circuit (14), for alternately selecting the first boost circuit (12) and the second boost circuit (13) to supply power to the LED backlight module. With the LED backlight driving circuit (10), the boosting efficiency of the circuit is improved and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of LED driving circuits, in particular to an LED backlight driving circuit. Background technique [0002] In the LED backlight driving circuit in the prior art, a Boost circuit (the boost converter or step-up converter, switching DC boost circuit) is usually used to supply power to the LED. [0003] refer to figure 1 , the Boost circuit includes a first inductor L0, a second inductor L, a diode D, a first capacitor C0, a second capacitor C, a metal-oxide-semiconductor field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) Q and Resistor R, where the metal oxide semiconductor field effect transistor is referred to as MOS transistor; the first inductor L0, the second inductor L, the diode D and the first capacitor C0 are sequentially connected in series and connected in parallel with the second capacitor C; the MOS transistor After Q is connected in series with the resistor R, on...

Claims

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Application Information

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IPC IPC(8): G09G3/32H05B44/00
CPCG09G3/3406G09G2320/064G09G3/32G09G2330/02H05B45/39H05B45/38
Inventor 高新明杨翔
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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