An analog PID controller-based galvanometer scanner is widely used by fractional laser medical equipment(FLME)to scan lasers across tissue surfaces,achieving the desired therapeutic effect.This type of driver,primarily composed of passive components and operational amplifiers,can only accept commands from the central controller of the FLME,with a simple hardware circuit-based fault diagnosis;thus,the safety of the FLME is compromised.To address these issues,the failure mechanisms of galvanometers and their impact on the safety of FLME are thoroughly analyzed first.Then,an adaptive limit protection method,a coil open circuit fault diagnosis,a communication timeout protection based on two handshakes,and a galvanometer control timeout protection are proposed,respectively,based on a digital driver platform,to supplement the deficiencies in the original fault diagnosis and protection system.This ensures the safety of the FLME.Finally,the effectiveness of the proposed strategies is validated through experiments.
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