Abstract
The control system of 532/940 nm double-wavelength high-power laser therapeutic instrument is designed to realize the safe and stable works. The laser power supply module, main controller module and interface circuit module is studied. FPGA is used to realize the digital control of constant current source, the TEC drive, the digital PID operation and the temperature control of the double-wavelength laser. MCU is responsible for the implementation of RS232 protocol analysis. The main control module and interface circuit module are designed based on the STM32F microprocessor, to realize the display and storage of relevant data, the touch screen drive, and the response and control of the interface. Keil software is used to write the control software. The whole system is tested. As is shown to the experimental results, the deviation between the output power and the set power is less than 2%, which can meet the stable output of the double-wavelength high-power laser therapeutic instrument and ensure that the laser therapeutic system meets the safety standards of medical devices.
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