一种适用于中低功率医用射频仪的新型可调开关电源设计  

Design of a new adjustable switching power supply suitable for low-medium power medical radio frequency instrument

作　　者：康佳 倪灿 侯健 陆巍[2] 周宇[1] KANG Jia;NI Can;HOU Jian;LU Wei;ZHOU Yu(School of Medical Instrument and Food Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine,Shanghai 200092)

机构地区：[1]上海理工大学医疗器械与食品学院,上海200093 [2]上海交通大学医学院附属新华医院,上海200092

出　　处：《生物医学工程研究》2020年第4期401-407,共7页Journal Of Biomedical Engineering Research

摘　　要：为了给中低功率的医用射频功率放大模块提供可调直流电压,本研究设计了一种新型、安全的可调开关电源,包括医用隔离开关电源模块和低压降压模块两部分。医用隔离开关电源模块采用商业化产品,负责将市电转化为48 V直流电压;低压降压模则基于ADI公司的LT8641进行开发,将48 V直流电压转换为0~45 V的可调直流电压;应用LTPowerCAD软件对低压降压模块进行稳定性设计,并用LTSpice仿真软件进行仿真验证,最后制作实物进行测试。经实物测试发现,电源可以安全稳定地输出0~45 V的可调电压,输出最大电流为3.5 A,最大功率90 W,上升时间最长65.1 ms,误差绝对值在6%以下。结果表明,新型可调开关电源可以实现稳定输出,且电源体积小,满足中低功率的医用射频设备的需求,验证了设计的可行性。In order to provide adjustable DC voltage for low-medium-power medical radio frequency(RF)power amplifier modules,a new and safe adjustable switching power supply was designed and implemented,which included of medical isolation switching power supply module and low-voltage step-down module.The medical isolation switch power supply module adopted commercial products,which was responsible for converting the commercial power into 48 V DC voltage;the low-voltage step-down module was developed based on the LT8641 of Analog Devices,which converted the 48 V DC voltage into an adjustable DC voltage of 0~45 V.We used LTPowerCAD for stability design of the low-voltage step-down module,and used LTSpice simulation software for simulation verification,then made physical test.The physical test showed that the power supply could output an adjustable voltage of 0~45 V safely and steadily.The maximum output current was 3.5 A,the maximum power was 90 W,the rise time was up to 65.1 ms,and the absolute value of the error was less than 6%.The results show that the new adjustable switching power supply can achieve stable output,and the power supply has a small size,which meets the needs of low-medium-power medical radio frequency equipment,confirming the feasibility of the design.

关 键 词：开关电源 射频 可调 BUCK 医用 

分 类 号：R318[医药卫生—生物医学工程]