Light emitting diode current regulating drive circuit

A technology of light-emitting diodes and driving circuits, applied in electroluminescent light sources, light sources, electric light sources, etc., can solve the problems of high market price, low transmission speed, and high cost, and achieve the effect of reducing costs and improving modulation bandwidth
CN107864535APending Publication Date: 2018-03-30深圳久屹光电有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
深圳久屹光电有限公司
Publication Date
2018-03-30

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Abstract

The invention discloses a light emitting diode current regulating drive circuit which comprises an LED (light emitting diode), a second current limiting resistor R2, a first current limiting resistorR1 and a signal switching tube Q1. A positive electrode of the LED is connected with an input power supply, a negative electrode of the LED is electrically connected with an input end of the signal switching tube Q1 through the second current limiting resistor R2, an output end of the signal switching tube Q1 is grounded, a signal input end of the signal switching tube Q1 is connected with data signals, one end of the first current limiting resistor R1 is electrically connected with the negative electrode of the LED, and the other end of the first current limiting resistor R1 is grounded. According to the LED current regulating drive circuit, the LED is incompletely switched off, the light intensity of the LED reaches the degree that light cannot be received, the LED is high in brightnessby increasing current flowing through the LED when the signal switching tube Q1 is on, and the LED emits slight light by decreasing the current flowing through the LED when the signal switching tube Q1 is off. Besides, the modulation bandwidth of a common LED can be increased, the circuit can be used for hundred-megabyte optical fiber communication, and the use cost of an optical communication module is greatly reduced.
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Description

technical field

[0001] The invention relates to the field of photoelectric conversion, in particular to a light-emitting diode current regulation drive circuit. Background technique

[0002] At this stage, in short-distance optical fiber communication, the light source uses resonant cavity light-emitting diodes

[0003] (RCLED: Resonant Cavity Light Emitting Diode), is a new light-emitting diode (LED) structure, which has the advantages of both traditional LED and vertical cavity surface laser (VCSEL); in view of these characteristics of RCLED, it also causes its The high market price, most of which are produced abroad, the low transmission speed and high cost of RCLED all limit its wide use in the market, and also hinder the development of optical fiber communication. Contents of the invention

[0004] Based on the above-mentioned problems, the problem to be solved by the present invention is to provide a light-emitting diode current regulation drive circuit that utilize...

Claims

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