Driving method and driving circuit of laser, and application of driving circuit in pump laser

Abstract

The invention discloses a driving method of a laser. A single chip microcomputer is adopted to control a PWM converter to realize adjustment of the working current of the laser; the adjustment is simple and convenient, the control efficiency is high, and the flexibility is greatly improved; working current change of the laser is collected by a sampling resistor; the collected current signal changes are converted into voltage signal changes; the voltage signal is amplified by an error amplifying circuit and then transmitted to the single chip microcomputer; the single chip microcomputer outputs a digital control signal to the error amplifying circuit according to the voltage signal input by the error amplifying circuit; the error amplifying circuit adjusts the output voltage and transmits to the PWM converter; and the PWM converter adjusts output duty ratio so as to adjust the working current of the whole laser. Meanwhile, the invention provides a driving circuit of the laser and an application of the driving circuit in a pump laser.

Description

technical field [0001] The invention belongs to the technical field of laser drive, in particular to a laser drive method, a drive circuit and an application in a pump laser. Background technique [0002] In the prior art, the drive circuit of the pump laser is mainly in the linear drive mode. For example, the Chinese invention patent with the notification number CN203338172U discloses a semiconductor laser constant current drive system, which records the use of a linear voltage regulation method that controls the NMOS transistor Q1. This method has low efficiency and large heat generation, resulting in inability to To adapt to the increasingly stringent energy consumption standards and the application of small volume occasions, it also uses the traditional adjustment method to manually adjust the size of the semiconductor laser drive current through the variable resistor, the production efficiency is low, and the variable resistor is aging during use. The current is unstab...

AI Technical Summary

Problems solved by technology

For example, the Chinese invention patent with the notification number CN203338172U discloses a semiconductor laser constant current drive system, which records the use of a linear voltage regulation method that controls the NMOS transistor Q1. This method has low efficiency and large heat generation, resulting in inability to To adapt to the increasingly stringent energy consumption standards and the application of small volume occasions, it also uses the traditional adjustment method to manually adjust the size of the semiconductor laser drive current through the variable resistor, the production efficiency is low, and the variable resistor is aging during use. The current is unstable, and the aging of the laser causes the output power to change, resulting in poor product performance

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