基于LCCL谐振变换器拓扑的新型经颅磁刺激电容器充电电源设计

Design of New Transcranial Magnetic Stimulation Capacitor Charging Power Supply Based on LCCL Resonant Converter Topology

为提高经颅磁刺激(TMS)的电流脉冲频率,该文提出一种基于电感-电容-电容-电感谐振变换器(LCCLRC)的电容器充电电源(CCPS)。首先,利用基波分析法推导出LCCLRC恒流输出以及逆变器输出电压与电流零相位条件的近似表达式;其次,对较小物理尺寸和较大电流增益的变换器的设计条件进行分析,根据仿真实验可得,以LCCL RC为充电电源的TMS系统脉冲频率是LCLCRC的1.21倍;最后,设计平均输出电流为1.15A、功率为118.37W的样机原型。结果表明,样机原型的实际电流增益为0.904,将3300μF储能电容从0V充电至100V的时间为315ms。相对于LCLCRC电容器充电电源,其充电时间减少了21.25%。实验结果验证了该理论分析的有效性。

To increase the frequency of transcranial magnetic stimulation(TMS)electrical current pulses,a kind of capacitor charging power supply(CCPS)based on inductor-capacitor-capacitorinductor resonant converter(LCCL RC)is proposed in this paper.Firstly,the approximate expressions of the LCCL RC constant current output and the zero-phase condition of the inverter output voltage and current are derived by first harmonic approximation.Secondly,the design conditions of the converter with smaller physical size resonant network size and larger current gain are analyzed.According to the simulation,the pulse frequency of TMS system using LCCL RC as charging power supply is 1.21 times that of LCLC RC.Finally,a prototype with an average output current of 1.15A and a power of 118.37W is designed.It is shown that the actual current gain of the prototype is 0.904,and the time to charge the 3300μF storage capacitor from 0V to 100V is 315ms.Compared with the LCLC RC capacitor charging power supply,the charging time is reduced by 21.25%.The experimental results verify the theoretical analysis.