A kind of control laser tube power circuit and method based on pwm signal

Abstract

The invention provides a circuit and method for controlling the power of a laser tube on the basis of a PWM signal. The circuit comprises a first signal amplification circuit, a central processor and a second signal amplification circuit; the first signal amplification circuit is used for receiving and amplifying a laser feedback signal output by the laser tube after the laser tube is started; the central processor is used for receiving the laser feedback signal output by the first signal amplification circuit and regulating and outputting the PWM signal according to the laser feedback signal; the second signal amplification signal is used for receiving and processing the laser feedback signal output by the first signal amplification circuit and the PWM signal output by the central processor, outputting a control signal and transmitting the control signal to the laser tube. According to the circuit and method, two closed feedback circuits are adopted to compensate the output power of the laser tube, so that the system reliability is far higher than that of an existing single-circuit control circuit.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a laser tube power control circuit and a method thereof, in particular to a laser tube power circuit and method based on a PWM (Pulse Width Modulation) signal. Background technique [0002] At present, laser tubes are widely used in many fields such as industry, communication, medical treatment, and military affairs. With the development of science and technology, the requirements for laser tube power are getting higher and higher, followed by the requirement of precise and stable control of the output power of laser tubes. The laser output power control circuit is an important part of the laser system, and its accuracy directly affects the stability of the laser tube, so it is necessary to improve the performance of the corresponding laser tube output power control circuit. The traditional laser tube output power control loop uses a negative feedback amplifier circuit t...

AI Technical Summary

Problems solved by technology

The traditional laser tube output power control loop uses a negative feedback amplifier circuit to compensate the power of the laser tube. The system has no redundancy (usually refers to increasing the reliability of the system through multiple backups), and has disadvantages such as low accuracy and poor reliability.

[0003] Moreover, in the prior art, the temperature compensation of the laser tube mostly uses a temperature sensor and a temperature compensation analog circuit to compensate the temperature of the laser tube, that is, the analog value of the temperature compensation signal is directly input into the laser tube, and the compensation error is relatively large.

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