高强度聚焦超声治疗仪中功率源的设计
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摘要
文章介绍了一种用于聚焦超声治疗系统的功率源的设计。以STM32微控制器为测控中心,结合DDS芯片AD9834产生PWM信号,经隔离、驱动后,控制半桥逆变电路开关管的导通和关断时间,产生同频的高压脉冲,再通过L型匹配网络,驱动超声换能器工作。同时利用STM32的DAC模块,实时采集换能器的工作电流、电压值,和相位检测电路输出的相位差信息一起送入单片机。单片机根据采集来的信息调节PWM波的占空比和写入AD9834的控制字,以实现调节功率和频率跟踪的目的。
This paper introduces the design of a power source for focused ultrasound treatment system. With STM32 microcontroller as the measurement and control center, combined with DDS chip AD9834, the PWM signal is generated. After isolation and driving, the on-off and off time of halfbridge inverters are controlled to generate high-voltage pulses of the same frequency, and then the ultrasonic transducer is driven by L-type matching network. At the same time, using the DAC module of STM32, the working current and voltage of the transducer are collected in real time, and the phase difference information output by the phase detection circuit is fed into the single chip computer. MCU adjusts the duty cycle of PWM wave and writes the control word of AD9834 according to the collected information, so as to realize the purpose of adjusting power and frequency tracking.
This paper introduces the design of a power source for focused ultrasound treatment system. With STM32 microcontroller as the measurement and control center, combined with DDS chip AD9834, the PWM signal is generated. After isolation and driving, the on-off and off time of halfbridge inverters are controlled to generate high-voltage pulses of the same frequency, and then the ultrasonic transducer is driven by L-type matching network. At the same time, using the DAC module of STM32, the working current and voltage of the transducer are collected in real time, and the phase difference information output by the phase detection circuit is fed into the single chip computer. MCU adjusts the duty cycle of PWM wave and writes the control word of AD9834 according to the collected information, so as to realize the purpose of adjusting power and frequency tracking.
引文
[1]翟伟翔,白焰,翟玲玲,智能化功率超声电源的研制[J].电力电子技术,2006.12(6),65-67
[2]叶正生,卢学军,秦玉成,一种新型功率超声电源[J],电加工与模具,2016增刊1,52-55
[3]阳鸿钧.IGBT实用备查手册[M].北京:中国电力出版社,2008.
[4]刘金亮,张建德,李永忠等.一种给脉冲形成线充电的带绕式高压脉冲变压器[J].强激光与粒子束,2003,15(4):394—396.
[2]叶正生,卢学军,秦玉成,一种新型功率超声电源[J],电加工与模具,2016增刊1,52-55
[3]阳鸿钧.IGBT实用备查手册[M].北京:中国电力出版社,2008.
[4]刘金亮,张建德,李永忠等.一种给脉冲形成线充电的带绕式高压脉冲变压器[J].强激光与粒子束,2003,15(4):394—396.