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Title:: Design of radiofrequency ablation signal generation system based on phase shifted full bridge

Author(s):: ZOU Jincheng; ZHANG Aili; （School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030,China）

Keywords:: Full bridge phase shift; RF power amplifier; RF current; Quick response; Precise control; RF therapy

摘要:: 为实现射频消融的快速精准控制，并适应不同组织的射频消融。本研究基于移相全桥控制的基本原理，利用DAC控制相移，调整射频电压输出，并结合全桥D类功率放大器，设计了435 kHz频率的射频消融信号发生系统。对系统移相控制、控制响应速率、实际射频输出功率、功率负载特性曲线进行测试，结果表明，系统可通过相移控制射频输出电压，具有微秒级的快速控制响应，额定阻抗下的输出功率误差小于3%，在20～2 000 Ω的负载下的最大输出功率大于40 W，具有较强的带载工作能力。

Abstract:: In order to achieve rapid and precise control of radiofrequency（RF）ablation and adapt to RF ablation of different tissues, [JP3]based on the basic principle of phase-shifting full bridge control, DAC was used to regulate the phase shift to adjust RF voltage output, and combined with the full bridge class D power amplifier, a 435 kHz RF generation system was designed. The phase shift control, response, actual RF output power and load characteristic curve of the system were tested. The results showed that the system could adjust the RF output voltage through phase shift, with microsecond level fast response time. Output power error under rated impedance was less than 3%. The maximum output power was greater than 40 W under the load of 20~2 000 Ω.The results demonstrate its strong load working capacity.