Detection circuit for output laser energy of laser welding machine

Abstract

The invention discloses a detection circuit for the output laser energy of a laser welding machine. The detection circuit comprises a diode primary detecting circuit, a phase inverting circuit, a system zero-setting and signal amplification circuit and a temperature compensation and isolation output circuit, which are electrically connected in sequence; the photodiode primary detecting circuit serves as a sampling circuit to realize the functions of converting laser power into a current signal and converting the current signal into a voltage signal; the phase inverting circuit realizes the function of a phase invertor and provides a presignal for the system zero-setting and signal amplification circuit; the system zero-setting and signal amplification circuit realizes the functions of system zero setting and signal amplifying; and the temperature compensation and isolation output circuit performs the functions of temperature compensation and isolation output. The detection circuit has the advantages of strong popularity, operation flexibility, stronger anti-interference characteristic, relatively low design cost, high efficiency, energy saving and strong product competitiveness and the system laser energy detection precision is improved.

Description

technical field [0001] The invention relates to a detection circuit, in particular to a detection circuit for outputting laser energy of a laser welding machine adopting an energy feedback control mode. Background technique [0002] At present, the widely used laser welding machines at home and abroad are mainly optical fiber conduction welding machines. In the environment of actively promoting energy saving and emission reduction and strengthening low-carbon industrial production, laser equipment also urgently needs to improve the stability of its energy output. Therefore, it is necessary to The energy output of laser equipment is detected. At present, most of the detection of output laser energy in laser equipment products adopts a simple design structure of a first-level operational amplifier detection plus a first-level operational amplifier isolation amplifier circuit. Such a structure lacks sufficient attention to the detection environment. And there are some defects i...

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Problems solved by technology

[0002] At present, the widely used laser welding machines at home and abroad are mainly optical fiber conduction welding machines. In the environment of actively promoting energy saving and emission reduction and strengthening low-carbon industrial production, laser equipment also urgently needs to improve the stability of its energy output. Therefore, it is necessary to The energy output of laser equipment is detected. At present, most of the detection of output laser energy in laser equipment products adopts a simple design structure of a first-level operational amplifier detection plus a first-level operational amplifier isolation amplifier circuit. Such a structure lacks sufficient attention to the detection environment. And there are some defects in the details of the actual application. In the actual application, the difference in the operation and installation of the existing circuit causes the measurement accuracy and consistency deviation, which is greatly affected by the application environment temperature and inconvenient to change the actual debugging. question

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