Design of Elevator Brake Power Supply Based on STC32G Microcontroller
For the deficiencies of high cost and poor controllability in elevator brake power supplies controlled by analog chips,a brake power supply system based on a digital controller was designed.Using an STC32G microcontroller as the controller,the AC voltage was converted into DC voltage through a rectification and filtering circuit,and then using a Buck converter for voltage reduction to power the brake coil.The STC32G built-in 12 bit high-precision analog-to-digital converter(ADC)module was used for sampling voltage and current,and for real-time voltage feedback adjustment.Based on sliding mode control theory,the approaching law function was improved,and a new type of non singular terminal sliding mode controller was designed to further improve the dynamic response and anti-interference performance of the brake power supply.Finally,a simulation model based on Matlab/Simulink and an STC32G experimental platform were built to verify the effectiveness of the designed power supply.The results show that compared to the PI controller,the new non-singular terminal sliding mode controller improves the voltage recovery time by more than 62.5%and 66.7%under the conditions of reference voltage change and load mutation,respectively.The designed brake power supply system exhibits good dynamic and steady-state performance,as well as strong anti-interference capability.
brake power supplySTC32 microcontrollerBuck converternon-singular terminal sliding modecontrollerelevatorbrake
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