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Light emitting diode voltage adjusting device and driving system with same

A light-emitting diode and voltage adjustment technology, which is applied to lighting devices, lamp circuit layout, light sources, etc., can solve the problems of high voltage of light strips, and achieve the effect of preventing protection and heat

Active Publication Date: 2013-02-27
CHANGSHA HKC OPTOELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the negative terminal voltage of the light bar may be in a high voltage state

Method used

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  • Light emitting diode voltage adjusting device and driving system with same
  • Light emitting diode voltage adjusting device and driving system with same
  • Light emitting diode voltage adjusting device and driving system with same

Examples

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Embodiment Construction

[0025] Embodiments of the invention will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

[0026] figure 1 is a block diagram showing a light emitting diode voltage adjusting device according to an embodiment of the present invention, figure 2 is a waveform diagram showing the operation of the light emitting diode voltage adjusting device according to an embodiment of the present invention, image 3 is a circuit diagram showing a Light Bar driving system including an LED voltage adjusting device according to an embodiment of the present invention.

[0027] refer to figure 1 , figure 2 and image 3 , according to an embodiment of the present invention, the LED voltage adjusting device includes a proportional integral (PI) regulator 110 , an integrator 120 , a ...

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Abstract

The invention discloses a light emitting diode voltage adjusting device and a driving system with the same. The light emitting diode voltage adjusting device comprises a PI (proportional-integral) adjuster, an integrator, a subtractor, a comparer and an integrated circuit module, wherein the negative input end of the PI adjustor is connected with the negative end of a light emitting diode light bar so as to receive the voltage of the negative end of the light bar; the positive input end of the PI adjustor is used for receiving the reference voltage; the integrator is used for integrating output signals of the PI adjustor; the positive input end of the subtractor is used for receiving output signals of the PI adjustor; the negative input end of the subtractor is used for receiving the over-current protecting and detecting voltage which is obtained from a boost converter for driving the light bar, and subtracting the over-current protecting and detecting voltage from the output signals of the PI adjustor; the positive input end of the comparer is used for receiving output signals of the integrator; the negative input end of the comparer is used for receiving output signals of the subtractor; and the integrated circuit module is used for receiving output signals of the comparer and outputting control signals for controlling a switch transistor of the boost converter to be powered on or powered off based on received signals.

Description

technical field [0001] The present invention relates to adjusting the voltage of a light-emitting diode (LED), and more specifically, to a device for adjusting the voltage applied to a light bar based on the negative terminal voltage of a light-emitting diode (Light Bar) and a driving system including the device. Background technique [0002] Liquid crystal displays (LCDs) have been widely used in various electronic devices. At present, most liquid crystal displays are backlight liquid crystal displays, which are composed of a liquid crystal display panel and a backlight module. Generally, the backlight module can be divided into two types according to the incident position of the light source: side incident light and direct incident light, and the backlight module can provide the light source for the liquid crystal display panel. [0003] Because light-emitting diodes have good photoelectric characteristics such as low power consumption, low calorific value, long operating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34H05B37/02
CPCH05B37/02H05B45/38Y02B20/30
Inventor 张先明杨翔
Owner CHANGSHA HKC OPTOELECTRONICS CO LTD
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