Voltage regulation driving circuit of light emitting diode

Abstract

The invention discloses a voltage regulation driving circuit of a light emitting diode (LED). The voltage regulation driving circuit comprises an LED, a current-limiting resistor R1, a signal switching tube Q2, a regulation tube Q1 and a voltage regulation resistor R2; the input end of the regulation tube Q1 is electrically connected with the positive electrode of the LED, and the connecting pointis connected with an input power supply through the current-limiting resistor R1; the output end of the regulation tube Q1 is electrically connected with the input end of the signal switching tube Q2; the output end of the signal switching tube Q2 is electrically connected with the negative electrode of the LED and the connecting point is grounded; the signal input end of the signal switching tube Q2 is connected with a data signal; the two ends of the voltage regulation resistor R2 are connected between the input power supply and the ground in parallel; and the middle tap of the voltage regulation resistor R2 is electrically connected with the enabling end of the regulation tube Q1. In the LED voltage regulation circuit, the LED is not fully switched off, and the light intensity of the LED cannot be received. When the voltage is increased to 3.3V, the LED can quickly convert energy into the highest light intensity; and meanwhile, by virtue of the circuit, the modulation bandwidth ofthe common LED can be increased, the circuit also can be used for optical fibre communication of one hundred megabyte, and the use cost of an optical communication module is greatly lowered.

Description

technical field [0001] The invention relates to the field of photoelectric conversion, in particular to a light-emitting diode voltage regulation driving circuit. Background technique [0002] At present, in short-distance optical fiber communication, the light source is a resonant cavity light emitting diode (RCLED: ResonantCavity Light Emitting Diode), which is a new type of light emitting diode (LED) structure, which has the traditional LED and vertical cavity surface laser (VCSEL) The advantages of both; in view of these characteristics of RCLED, it has caused its high market price, and most of it is produced abroad, and the high cost of RCLED has limited its wide use in the market, and also hindered the development of optical fiber communication. Contents of the invention [0003] Based on the above-mentioned problems, the problem to be solved by the present invention is to provide a light-emitting diode voltage-regulating drive circuit that utilizes ordinary LEDs to ...

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Problems solved by technology

[0002] At present, in short-distance optical fiber communication, the light source is a resonant cavity light emitting diode (RCLED: ResonantCavity Light Emitting Diode), which is a new type of light emitting diode (LED) structure, which has the traditional LED and vertical cavity surface laser (VCSEL) The advantages of both; in view of these characteristics of RCLED, it has caused its high market price, and most of it is produced abroad, and the high cost of RCLED has limited its wide use in the market, and also hindered the development of optical fiber communication.

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