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LED driver and driving method thereof

A light-emitting diode and driving device technology, applied in the field of light-emitting diode driving devices, can solve difficult problems such as light output and precise control of light-emitting diodes

Inactive Publication Date: 2009-06-17
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is more inconvenient in applications that require load changes, and it is difficult to precisely control the light output of LEDs.

Method used

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  • LED driver and driving method thereof
  • LED driver and driving method thereof
  • LED driver and driving method thereof

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Experimental program
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Embodiment Construction

[0023] Please refer to image 3 , the adjustable light emitting diode driving device 2 of the present invention includes a voltage source 21, a field effect transistor 22, a feedback control circuit 23, a current limiting resistor 24 and a light emitting diode 25, wherein the voltage source 21 is connected to the field effect transistor 22, the drain of the field effect transistor 22 is connected to the current limiting resistor 24 for driving the light emitting diode 25, the feedback control circuit 23 includes a first differential amplifier circuit 231, a second differential amplifier circuit 232, an integrating circuit 233 and an adjustable reference voltage source 234, the two input terminals of the first differential amplifier circuit 231 are respectively connected to the two ends of the current limiting resistor 24, the output of the first differential amplifier circuit 231 terminal and the adjustable reference voltage source 234 are respectively connected to two input t...

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Abstract

A driving device for tunable light emitting diode used for driving diode, comprises a field effect transistor, a feed back control circuit and a current limiting resistor. The drain electrode of field effect resistor connects to current limiting resistor used of driving light emitting diode, the feed back control circuit includes a first differential amplifying circuit, second differential amplifying circuit, a integrating circuit and a tunable reference voltage source. The both input end of first differential amplifying circuit each connected to the both end of second differential amplifying circuit, the output end of the second differential amplifying each connects to the integrating circuit, the output end of integrating circuit connects to the grid of the field effect transistor.

Description

【Technical field】 [0001] The invention relates to a light source driving device, in particular to a light emitting diode driving device. 【Background technique】 [0002] In the prior art, a voltage source is used in series with a current-limiting resistor to directly drive the light-emitting diode. Since the light-emitting diode is driven by a forward bias voltage, its cross-voltage will change due to the change of the driving current. Therefore, when the driving voltage is linearly adjusted, The change of the driving current will affect the cross-voltage of the LED, so that the driving current will not change linearly with the voltage source. Even when the voltage source changes too much, the forward bias is too large, so that the light-emitting diode is burned. [0003] A prior art light emitting diode driving device such as figure 1 As shown, the voltage source 10 applies a voltage on the light emitting diode array 12 through the current limiting resistor 11, the light e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32H05B37/02
Inventor 林志泉李青谚
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD