CAJ | 학술논문

介绍了一种基于STM32的超声电源，其利用DDS芯片直接合成需要的PWM驱动波形，死区时间由单稳态触发器来调节，采用最大电流反馈跟踪及锁相跟踪相结合的方式来实现频率跟踪。通过调节STM32输出PWM信号的占空比，从而控制半桥变换器，使其保持功率恒定。实验表明，本电源具有跟踪精度高、成本低、工作稳定的特点。
개소료일충기우STM32적초성전원，기이용DDS심편직접합성수요적PWM구동파형，사구시간유단은태촉발기래조절，채용최대전류반궤근종급쇄상근종상결합적방식래실현빈솔근종。통과조절STM32수출PWM신호적점공비，종이공제반교변환기，사기보지공솔항정。실험표명，본전원구유근종정도고、성본저、공작은정적특점。
An ultrasonic power based on STM32 and DDS has been designed. The high speed DDS controller generates the PWM signal required to drive the half bridge inverter ,of which the dead-time is controlled by a mono-stable multi-vibrator. The frequency tracing ,one of the most important function of ultrasonic power supply,has used the method of maximum current feedback and PLL-method. By adjusting the duty cycle of PWM signal generated by STM32 ,the output of the half-bridge inverter can be stabilized and adjusted according to the load impedance. The experiment results show that the ultrasonic power supply can provide high frequency tracing accuracy ,and performance stability. The total cost of the whole system is low.