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Light-emitting diode driving device and short protection method for driving device

A technology of light-emitting diodes and driving devices, applied in lighting devices, electroluminescent light sources, light sources, etc., can solve problems such as malfunction of short-circuit detection circuits, and achieve the effect of avoiding damage

Active Publication Date: 2018-03-06
WISTRON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, when the light-emitting diode is lit, the short-circuit detection circuit in the drive device may often malfunction

Method used

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  • Light-emitting diode driving device and short protection method for driving device
  • Light-emitting diode driving device and short protection method for driving device
  • Light-emitting diode driving device and short protection method for driving device

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Embodiment Construction

[0048] figure 1 is a schematic diagram of an LED driving device 100 according to an embodiment of the present invention. Please refer to figure 1 , the LED driving device 100 (hereinafter referred to as the driving device 100) includes light emitting diode (LED) modules 110-1 to 110-4, a driving circuit 120, a reference voltage setting circuit 130, a voltage comparison circuit 140 and a power supply unit 150 . The driving device 100 may include one or more light-emitting diode modules. In this embodiment, four LED modules 110-1-110-4 are used as an example for illustration, and those who apply this embodiment can adjust the number of LED modules according to their needs. For example, set up 8 or more LED modules.

[0049] Each LED module 110-1~110-4 includes a plurality of light emitting diodes (LEDs) connected in series. In other words, these LED modules 110 - 1 - 110 - 4 are LED light strings (or called LED light bars) in which a plurality of LEDs are connected in series...

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Abstract

A light-emitting diode (LED) driving device and a short protection method for a driving device are provided. The driving device includes an LED module, a driving circuit, a reference voltage setting circuit, a voltage comparison circuit, and a power supply. A first node of the LED module receives a lighting voltage, and a second node of the LED module has a first voltage. The reference voltage setting circuit receives the lighting voltage to generate a reference voltage. The voltage comparison circuit determines whether the first voltage is greater than the reference voltage when the LED module is turned off. When the first voltage is greater than the reference voltage, the voltage comparison circuit generates a short signal. The power supply supplies power to the LED module and determineswhether to shut down the power of the LED driving device according to the short signal. The device and the method can effectively prevent the driving device from being damaged since the light-emitting diode is in short circuit.

Description

technical field [0001] The invention relates to a driving technology of a light emitting diode, and in particular to a driving device of a light emitting diode and a short circuit protection method of the driving device. Background technique [0002] With the advancement of semiconductor technology, the luminous brightness and luminous efficiency of light emitting diodes (LEDs) continue to increase. Light-emitting diodes have the advantages of long service life, small size, low power consumption, low pollution, high reliability, and suitable for mass production. Light emitting diodes can be used in a wide range of fields, for example, they can be used in illumination apparatuses, backlight sources of liquid crystal displays (liquid crystal displays (LCDs) and large billboards, and the like. [0003] Generally speaking, in order to avoid damage to key components (eg, transistors) in the driving device after the LED is damaged, protection measures are generally provided when ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/54H05B45/46Y02B20/30
Inventor 叶士吉胡如兴蔡佩琪黄伟铨
Owner WISTRON CORP