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

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Problems solved by technology

[0004] When the number of LEDs increases and the load becomes larger, it is necessary to use multiple sets of

Method used

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Examples

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Example Embodiment

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

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

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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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