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LED driver

A technology of light-emitting diodes and driving devices, which is applied in the field of light-emitting diode driving devices, and can solve problems such as poor relative efficiency and high hardware costs

Active Publication Date: 2016-12-28
POWER FOREST TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the hardware cost of this type of driving device is relatively high, and due to the multi-stage boost converter 40, the relative efficiency is poor

Method used

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Embodiment Construction

[0058] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In addition, wherever possible, elements / components using the same reference numerals in the drawings and embodiments represent the same or similar parts.

[0059] Figure 1B Shown is a schematic diagram of an LED driving device 10 according to an embodiment of the present invention. Please refer to Figure 1BThe LED driving device 10 of this embodiment is at least suitable for driving a light emitting diode (LED) backlight module 20 of a liquid crystal display (LCD), but is not limited thereto. Wherein, the light-emitting diode backlight assembly 20 has multiple groups of parallel LED strings (LED string) LLBi (i=1~m), and each LED string LLBi (i=1~m) is composed of multiple LED strings connected in series. Composed of light-emitting diodes Li1~LiN (i=1~m), such as figure 2 shown. In addition, the LED driving ...

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PUM

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Abstract

The invention provides a light-emitting diode driving device, which includes an AC-DC power converter, a balanced circuit, and a pulse width modulation control unit. The light-emitting diode driving device proposed by the present invention uses a balance circuit to balance the current flowing through all the light-emitting diode strings. In this way, the purpose of current equalization can be achieved. In addition, the light-emitting diode driving device proposed by the present invention can be based on the balance between a set of independent DC output voltages generated by the AC-DC power converter and the control voltage provided by the balanced circuit without using any boost converter. The pulse width modulation control unit is controlled by a formula to indirectly change the DC output voltage generated by the AC-DC power converter for directly driving all the LED strings. In this way, the goals of low cost and high efficiency can be achieved.

Description

technical field [0001] The present invention relates to a light-emitting diode driving device, and in particular to a light-emitting diode with characteristics of current matching, low cost, high efficiency and high stability drive unit. Background technique [0002] In recent years, with the vigorous development of semiconductor technology, portable electronic products and flat panel display products are also emerging. Among many types of flat panel displays, Liquid Crystal Display (LCD) has become the mainstream of various display products due to its advantages of low voltage operation, no radiation scattering, light weight and small size. Generally speaking, since the liquid crystal display panel itself does not have the characteristic of self-illumination, a backlight assembly must be placed under the liquid crystal display panel to provide the required (back) light source for the liquid crystal display panel. [0003] Traditional backlight assemblies can be roughly di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/46H05B45/385H05B45/39
Inventor 史富元王文圣
Owner POWER FOREST TECH