High-precision light-emitting diode (LED) control circuit and high-precision LED control method and LED drive circuit using the same

A technology of LED drive and control circuit, applied in the direction of lamp circuit layout, electric light source, electrical components, etc., can solve the problem of inaccurate LED dimming, and achieve the effect of precise dimming

Active Publication Date: 2013-03-20
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a high-precision LED control circuit and control method to overcome the problem that the compensation signal in the prior art cannot accurately represent the output voltage feedback signal and cause the LED dimming to be inaccurate.

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  • High-precision light-emitting diode (LED) control circuit and high-precision LED control method and LED drive circuit using the same
  • High-precision light-emitting diode (LED) control circuit and high-precision LED control method and LED drive circuit using the same
  • High-precision light-emitting diode (LED) control circuit and high-precision LED control method and LED drive circuit using the same

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[0031] Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0032] refer to Figure 2A , shows a functional block diagram of the first embodiment of the control circuit of the LED driving circuit according to the present invention. Similar to the background art, the LED drive circuit receives the enable signal EN, and performs power conversion to drive the LED load in the valid range of the enabl...

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Abstract

The invention provides a high-precision light-emitting diode (LED) control circuit and a high-precision LED control method and a LED drive circuit using the same, and solves the problem of LED dimming insufficient precision due to the fact that compensating signals in the prior art can not precisely characterize output voltage feedback signals. Compared with the prior art, according to the LED control circuit of the LED drive circuit, reference voltage signals are controlled to be joined into the LED control circuit in significant intervals of enable signals of control power level circuits, and therefore the compensating signals can precisely reflect changes of the output voltage feedback signals and precise dimming is achieved.

Description

technical field [0001] The present invention relates to the field of LED driving circuits, and more specifically, to a high-precision LED driving circuit control circuit and a control method. Background technique [0002] With the continuous innovation and rapid development of the lighting industry, coupled with the increasing importance of energy saving and environmental protection, LED lighting, as a revolutionary energy-saving lighting technology, is developing rapidly. However, due to the volt-ampere characteristics and temperature characteristics of the LED itself, the sensitivity of the LED to the current is higher than the sensitivity to the voltage, so the traditional power supply cannot directly supply power to the LED. Therefore, to use LED as a lighting source, we must first solve the problem of power drive. [0003] FIG. 1 shows a control circuit of a commonly used LED driving circuit in the prior art. The working state of the LED drive circuit is controlled by...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B44/00
CPCY02B20/30H05B45/38H05B45/3725
Inventor 徐孝如张鲁
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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