An adjustable constant current drive circuit for semiconductor laser with temperature compensation

A temperature compensation, constant current drive technology, applied in semiconductor lasers, lasers, laser parts and other directions, can solve problems such as laser instability, and achieve the effect of completely practical structure, improved instability, and simple structure

Active Publication Date: 2018-04-13
武汉翊晟科技有限公司
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Problems solved by technology

[0003] The present invention mainly solves technical problems such as the instability of the output of the laser due to the influence of temperature factors in the ordinary constant current mode existing in the prior art, and provides an adjustable constant current drive circuit for semiconductor lasers with temperature compensation

Method used

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  • An adjustable constant current drive circuit for semiconductor laser with temperature compensation

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Embodiment

[0013] see figure 1 Circuit schematic diagram, this circuit is composed of an operational amplifier U10, a thermistor R2, a MOS transistor Q19, a three-stage voltage regulator lm4040, two power supplies, several resistors and capacitors.

[0014] The three-terminal voltage regulator lm4040 is powered, and the output is connected in series to the positive input of the operational amplifier U10. The thermistor R2 and R3 are connected in parallel and then connected in series to the output of the three-stage voltage regulator, and then connected to the positive input of the operational amplifier. terminal, the potentiometer RP is connected to the positive input terminal of the operational amplifier U10 and then grounded.

[0015] In particular, the thermistor R2 is an NTC type resistor with a negative temperature coefficient, its characteristic is a pure resistance value, and its resistance value changes linearly with temperature. In the implementation case, it is mounted on the h...

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Abstract

The invention relates to an adjustable constant current drive circuit, which belongs to the technical field of laser control, in particular to an adjustable constant current drive circuit for semiconductor lasers with temperature compensation. Including: operational amplifier U10, MOS tube Q19, and laser LD connected in sequence, the positive input terminal of operational amplifier U10 is connected to the power supply input terminal through resistor R3, and the two ends of resistor R3 are connected to an NTC-type thermistor R2 with a negative temperature coefficient They are connected in parallel, and the thermistor R2 is located on the heat dissipation shell of the laser LD. Therefore, the present invention has the following advantages: 1. Improve the instability of the output of the laser caused by the influence of temperature factors in common constant current mode. 2. The structure is simple and completely practical.

Description

technical field [0001] The invention relates to an adjustable constant current drive circuit, which belongs to the technical field of laser control, in particular to an adjustable constant current drive circuit for semiconductor lasers with temperature compensation. Background technique [0002] In the characteristics of semiconductor lasers, the output optical power depends not only on the injection drive current, but also the temperature is an important factor that cannot be ignored. However, in general drive circuits, the impact of injection is mostly considered, mainly to control the constant current. Driven by the way, due to the environment of the laser and the accumulation of photoelectric conversion loss, the temperature of the tube core will rise, which will cause the power output to change, so that the laser will be in an unstable working state. Contents of the invention [0003] The present invention mainly solves technical problems such as the instability of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/042
Inventor 黄绪华欧阳文洪汉润
Owner 武汉翊晟科技有限公司
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