基于STM32微控制器的高频脉宽调制器的设计

Design of High-frequency Pulse Width Modulator Based on STM32 Microcontroller

高频脉冲电源对提高微细电解加工的工艺性有着重要的作用,而脉宽调制器经驱动电路生成IGBT控制信号决定着高频高压脉冲电源的输出频率及占空比;针对电解加工工艺的特殊性,创新性地提出基于32位微型控制器芯片STM32F103RCT6为核心的调频调占空比的方案;根据脉冲频率、占空比可调的要求,完成了脉宽调制器的软硬件设计,通过编译运行程序代码进行一系列的调频、调占空比实验并利用示波器采集两路输出的PWM波形;实验表明,自行研制的脉宽调制器能稳定地调节两路PWM控制信号的频率及占空比,验证了装置及设计的合理性。

The high-frequency pulse power supply plays an important role in improving the manufacturability of the micro electrochemical machining.The pulse width modulator generates the IGBT control signal through the drive circuit to determine the output frequency and duty cycle of the high-frequency and high-voltage pulse power source.In view of the particularity of the electrochemical machining,a innovational solution based on the32-bit microcontroller chip STM32F103RCT6as the core to regulate the frequency and the duty cycle,was proposed.According to the requirement of regulating the pulse frequency and duty cycle,it has already completed the hardware and software design of the pulse width modulator in the study.A series of regulating the frequency and the duty cycle experiments were performed by compiling and running the program code,and the PWM waveforms of the two outputs were collected by an oscilloscope.Experiments show that the self-developed pulse width modulator can stably regulate the frequency and duty cycle of the two PWM control signals,verifying the rationality of the device and design.