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Circuits and methods for driving light sources

A technology of driving circuit and LED light source, applied in the direction of electric lamp circuit arrangement, light source, electric light source, etc., can solve the problems of increasing system cost, and achieve the effect of reducing system cost and reducing energy consumption

Inactive Publication Date: 2012-04-25
AOTU ELECTRONICS WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of this solution is that because each LED string requires a designated DC / DC converter, if there are a large number of LED strings in the system, the cost of the system will increase accordingly

Method used

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  • Circuits and methods for driving light sources
  • Circuits and methods for driving light sources
  • Circuits and methods for driving light sources

Examples

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Embodiment Construction

[0031] Detailed reference will be given below to examples of the present invention. Although the present invention has been illustrated and illustrated by these embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, the invention covers all alternatives, modifications and equivalents which are within the spirit and scope of the invention as defined by the appended claims.

[0032] In addition, in order to better understand the present invention, numerous specific details are given in the specific embodiments below. It will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, steps, components and circuits are not described in detail so as to highlight the gist of the present invention. In the embodiment of the invention, the LED string is used as a light source for lighting, but the driving circuit described in the...

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Abstract

A driving circuit for powering light-emitting diode (LED) light sources includes an energy converter and a plurality of current balance controllers. The energy converter receives input voltage and provides modulated voltage to the LED light sources, and the current balance controllers connected with the energy converter respectively control currents flowing across the LED light sources. The current balance controllers receive a first referential signal indicating a target average level and a second referential signal indicating a maximal transient level, and modulate average level of each current into the target average level and maximal transient level of each current to a level within the maximal transient level.

Description

technical field [0001] The invention relates to a circuit and method for supplying power to a light source. Background technique [0002] In a display system, a driving circuit is usually used to drive one or more light sources to illuminate a display panel. For example, in a liquid crystal display (LCD) display system using light emitting diodes (LEDs) as a backlight, an array of light emitting diodes is used to illuminate the LCD display panel. A light emitting diode array usually includes two or more LED strings, and each LED string is connected in series by a group of LED lamps. For each LED string, the forward voltage drop required to achieve the desired light output typically varies with LED chip size, material, etc., as well as temperature. Therefore, in order to produce light output with the same brightness, a driver circuit is used to regulate the current flowing through each LED string to be substantially constant. [0003] figure 1 Shown is a schematic diagram...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 柳达
Owner AOTU ELECTRONICS WUHAN
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