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Multi-channel light-emitting diode (LED) linear driver

An LED driver and linear driver technology, applied in the field of integrated circuits and LED drivers, can solve the problems of reducing the size of the driving power supply and high cost, and achieve the effects of high PF value, improved performance, and improved LED life.

Inactive Publication Date: 2014-03-19
上海岭芯微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PF value of the active type can usually reach more than 0.98, but the cost is relatively high; the PF value of the passive type is low, and it is not conducive to reducing the volume of the driving power supply

Method used

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  • Multi-channel light-emitting diode (LED) linear driver
  • Multi-channel light-emitting diode (LED) linear driver
  • Multi-channel light-emitting diode (LED) linear driver

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Embodiment Construction

[0028] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same numbers will be used throughout the drawings to refer to the same or like parts. In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some terms mentioned in the description of the present invention may be selected by the applicant according to his or her judgment, and the detailed meanings thereof are set forth herein described in the relevant section of the description. Furthermore, it is required that the present invention be understood not only by the actual terms used, but also by the meaning implied by each term.

[0029] figure 1 A circuit diagram schematically showing a typical structure of the multi-channel LED ...

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Abstract

The invention provides a multi-channel light-emitting diode (LED) linear driver which comprises a voltage regulation circuit, a linear regulation circuit, a plurality of LED lamp groups and a plurality of LED drivers. The voltage regulation circuit converting input voltage of alternating-current mains supply into direct-current voltage and outputs first direct-current voltage and second direct-current voltage, and the value of the first direct-current voltage is higher than that of the second direct-current voltage. The linear regulation circuit receives the second direct-current voltage from the voltage regulation circuit. The plurality of LED lamp groups are connected serially, each of the LED lamp groups is formed by at least one LED; one end of each of the LED drivers is connected to the cathode of each of the LED lamp groups to drive the LED lamp group to be turned on or turned off, the other end of each of the LED drivers is connected to the linear regulation circuit, the first direct-current voltage from the voltage regulation circuit is directly applied to the cathodes of the plurality of LED lamp groups, the linear regulation circuit drives each of the plurality of LED drivers to enter the linear regulation circuit sequentially according to changes of the input voltage.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits and LED drives, and in particular relates to a multi-channel LED linear driver. Background technique [0002] With the development of lighting technology, LED (Light Emitting Diode) as a new type of light source is gradually accepted by the market. LED mainly has significant advantages such as energy saving, high efficiency and long life. [0003] Since LED is a current device, providing a stable constant current power supply to the LED device is one of the technical keys of the LED driving power supply. In addition, the ideal driving circuit should also have the advantages of high efficiency, low cost, small size, and the service life of the LED. [0004] On the one hand, electrolytic capacitors are often used in existing LED drive power supplies. Usually, the life of electrolytic capacitors is less than 5,000 hours, and the long life is about 10,000 hours. The life of electrolytic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 徐剑曾蕴浩郑萍芳胡舜涛董用兵
Owner 上海岭芯微电子有限公司
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