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.
关键词
抱闸电源/STC32G单片机/Buck变换器/非奇异终端滑模/控制器/电梯/制动器
Key words
brake power supply/STC32 microcontroller/Buck converter/non-singular terminal sliding mode/controller/elevator/brake
维普
万方数据