Voltage Adaptive Laser Driving Circuit and Its Control Method

Abstract

This application discloses a voltage adaptive laser drive circuit and its control method. The circuit includes: switching power supply (1), laser (2), constant current drive circuit (3), current setting circuit (4), MCU control circuit ( 5), a voltage acquisition circuit (6), a voltage setting circuit (7); the switching power supply (1) is connected to the laser (2) and the voltage setting circuit (7) respectively, and is used to power the laser (2) and the voltage setting circuit (7) provide electric energy; the laser (2) is respectively connected to the switching power supply (1) and the constant current drive circuit (3) for generating laser light. In the present invention, the PID adjustment of the voltage acquisition circuit and the voltage setting circuit by the MCU control circuit realizes the adaptive change of the output voltage of the switching power supply according to the working state of the laser and the constant current circuit, and realizes PWM by adjusting the current setting circuit by the MCU control circuit. High-speed strobe function.

Description

technical field [0001] The invention relates to the technical field of laser drive circuits, in particular to a voltage-adaptive digitally controlled laser constant current drive circuit and a control method thereof. Background technique [0002] Lasers have been widely used in people's daily life, industrial production, medical equipment, aerospace, special equipment or military weapons. LD semiconductor lasers are more common among lasers. Because of their mature production process and relatively low cost, they have been widely used in long-distance optical fiber communication, wireless communication, laser marking, laser ranging, laser radar, laser weapons and other fields. [0003] LD lasers are generally driven by a constant current. Generally, the output current of the laser is a constant current or a PWM modulated current signal, and the amplitude of the driving current is generally constant; If there is a large surge current or current overshoot during work, it is e...

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Problems solved by technology

For example, the document CN109950790A "A Laser Control Circuit, A Laser Device" proposes a constant current drive circuit to realize the operation of lasers with different junction voltages, but this solution can only output a constant current, and the power supply voltage can be adjusted through an external adjustable resistance; the document CN111355121A "Double Pulse Laser Driving System, Driving Circuit and Driving Method" proposes a double pulse LD laser constant current driving circuit and method, but the power supply of this scheme is not adjustable and requires two input signals Controlling the generation of double pulses limits its application; the document CN110445011A "A Laser Power Supply Constant Current Driving Circuit and Method" mainly solves the stability and life of the laser, and does not take into account the efficiency of the laser and the application of PWM pulse width modulation; The document CN105208739B "Laser Light Source Constant Current Driving Device" proposes a constant current output laser drive circuit powered by a DC / DC power supply, which does not realize the regulation of the laser voltage and the PWM pulse width modulation of the laser

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