Two-in-one power source for LED backlight and LED backlight display

A two-in-one, power supply technology, applied to static indicators, instruments, etc., can solve problems such as complex circuit structure, high product cost, and poor reliability, and achieve the effect of simplifying circuit structure, reducing product cost, and avoiding poor circuit reliability

Active Publication Date: 2015-04-29
HKC CORP LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a LED backlight two-in-one power supply, aiming at solving the problem that the existing LED backlight two-in-one power supply uses an integrated architecture of a flyback power supply and a BOOST booster circuit, which makes the circuit structure complex and the product Problems of high cost, low conversion efficiency and poor reliability

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  • Two-in-one power source for LED backlight and LED backlight display

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0026] Aiming at the problems existing in the prior art, the present invention proposes a LED backlight two-in-one power supply and an LED backlight display. The LED backlight two-in-one power supply omits the BOOST boost circuit, and the LED load is equivalent to a stable voltage. The sampling circuit is used to sample the current of the LED load, and the sampling signal of the sampling circuit is amplified by the constant current control circuit. The flyback control circuit adjusts the corresponding duty cycle according to the output of the constant current control circuit; at the same time, t...

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Abstract

The invention belongs to the technical field of LED backlight display, and provides a two-in-one power source for LED backlight and a LED backlight display. The two-in-one power source for LED backlight is characterized in that LED load is equivalent to stable voltage and is subjected to current sampling by a sampling circuit; a sampling circuit of the sampling circuit is amplified by virtue of a constant current control circuit; corresponding duty cycles of an excitation control circuit are regulated according to the output of the constant current control circuit; meanwhile, the voltage is subjected to buck conversion by utilizing direct current-direct current conversion circuit and the electricity is supplied to a main board. The circuit can normally work in a relatively-wide input voltage range; compared with the prior art, the two-in-one power source has the advantages that a BOOST circuit is eliminated, the structure is simple, the cost is low, and the conversion rate can reach 82 percent; meanwhile, boost inductance is not needed, and the problem of poor circuit reliability and the like possibly caused by the boost inductance can be solved.

Description

technical field [0001] The invention belongs to the technical field of LED backlight display, and in particular relates to an LED backlight two-in-one power supply and an LED backlight display. Background technique [0002] At present, in the field of liquid crystal display technology, light-emitting diode (Light-Emitting Diode, LED) backlights are widely used to replace traditional cold-cathode fluorescent lamps (Cold Cathode Fluorescent Lamp, CCFL) backlights to improve display effects. [0003] In order to meet the low-cost requirements of the display industry, LED backlight two-in-one power supplies are usually used in current LED backlight displays. This type of power supply can simultaneously realize the light-emitting drive of the LED backlight module and the power supply of each circuit on the main board of the LED backlight display. [0004] In the prior art, the LED backlight two-in-one power supply generally adopts an integrated architecture of a stable and relia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34
Inventor 王智勇王一新
Owner HKC CORP LTD
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