Radio frequency carbon dioxide laser power limiting circuit, laser and power limiting method

The invention relates to the technical field of carbon dioxide lasers, in particular to a radio frequency carbon dioxide laser power limiting circuit, a laser and a power limiting method. The output radio frequency signal acquisition circuit is connected with the radio frequency signal detection circuit, the signal conversion shaping circuit is connected with the radio frequency signal detection circuit and the pulse measurement and control output MCU single chip microcomputer circuit, and the pulse measurement and control output MCU single chip microcomputer circuit is further connected with the user PWM signal isolation shaping circuit and the user signal gate switch circuit. The user PWM signal isolation shaping circuit is connected with the user signal gate switch circuit, the user PWM pulse frequency, the duty ratio and the internal radio frequency output pulse frequency and the duty ratio are calculated and serve as standards for judging whether the laser runs abnormally or exceeds the limit or not, the