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Current setting circuit of a plurality of light-emitting diode (LED) strings and method thereof

A current setting and circuit technology, which is applied in the direction of electric lamp circuit layout, electric light source, light source, etc., can solve problems such as uneven brightness of LED lamps, and achieve the effect of uniform brightness

Inactive Publication Date: 2013-02-20
BCD SEMICON MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the current obtained by each channel of the LED string is different, it will cause uneven brightness of each LED lamp

Method used

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  • Current setting circuit of a plurality of light-emitting diode (LED) strings and method thereof
  • Current setting circuit of a plurality of light-emitting diode (LED) strings and method thereof
  • Current setting circuit of a plurality of light-emitting diode (LED) strings and method thereof

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Embodiment Construction

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0031] The embodiment of the present invention discloses a current setting circuit and method for a plurality of LED strings, so as to achieve the same driving current obtained by each LED string, and further realize uniform brightness of LED lamps.

[0032] like figure 1 As shown, a current setting circuit of a plurality of LED strings includes: a current generating circuit 11, a current mirror 12 having multiple output terminals and receiving curren...

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PUM

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Abstract

The invention discloses a current setting circuit of a plurality of light-emitting diode (LED) strings and a method thereof. The circuit comprises a current generation circuit, a current mirror with a plurality of output ends and used for receiving current generated by the current generation circuit and a selection switching module. The selection switching module conducts one-to-one communication between the output ends of the current mirror and the LED strings and switches the one-to-one communication in non-repeated mode to enable each LED string to conduct one-to-one communication with the output ends of the current mirror in set time. The circuit can achieve the effect that the LED string have identical current and further achieves even brightness of an LED lamp.

Description

technical field [0001] The invention relates to the technical field of controlling the brightness of LED lamps, and more specifically, relates to a current setting circuit and method for multiple LED strings. Background technique [0002] At present, with the continuous development of semiconductor technology, the application range of LED lights is becoming wider and wider. Generally, each LED lamp is composed of multiple LED strings connected in parallel, and each LED string is respectively connected to one of the output terminals of the current mirror to obtain a driving current. [0003] However, due to the drift of the semiconductor process, the semiconductor devices at the respective output terminals of the current mirror will have a mismatch. Therefore, the currents at the output ends of the current mirror will be different, and the currents obtained between the channels of the LED strings connected to the output ends of the current mirror will also be different. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCY02B20/42Y02B20/40
Inventor 司徒道明吴允栋孙建波
Owner BCD SEMICON MFG
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