To improve the stimulation efficiency of transcranial magnetic stimulation (TMS) and reduce the size and power consumption of the overall circuit, a compact and efficient capacitor charging power supply using an inductor–capacitor–inductor–capacitor resonant converter (LC–LC RC) is designed in this study. The LC–LC RC has the characteristics of low power consumption, high efficiency and uses the voltage gain of the resonant circuit itself and a voltage doubler rectifier circuit instead of the transformer to reduce the size and weight of the overall circuit. A detailed ac analysis with fundamental frequency approximation of the LC–LC RC is presented. Expressions for converter gain, operating condition of the converter as a constant-current power supply, and condition of the converter voltage and current zero-phase difference are derived. In addition, RC design value conditions for the minimum resonant network size are derived. An experimental 1.05 A 120   V prototype converter is designed, developed, and tested to verify the theoretical analysis. Experimental results indicate that this circuit is suitable for use in capacitor charging to increase the stimulation performance of TMS.

中文翻译：

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用于TMS的紧凑型快速电容器充电电源的开发

为了提高经颅磁刺激（TMS）的刺激效率并减小整个电路的尺寸和功耗，使用电感器-电容器-电感器-电容器谐振转换器（LC-LC RC）的紧凑而高效的电容器充电电源是在这项研究中设计。LC-LC RC具有低功耗，高效率的特点，并利用谐振电路本身的电压增益和倍压整流电路代替变压器来减小整个电路的尺寸和重量。给出了使用LC-LC RC基本频率近似进行的详细交流分析。导出了转换器增益，作为恒流电源的转换器的工作条件以及转换器电压和电流零相差的条件的表达式。另外，得出了最小谐振网络尺寸的RC设计值条件。实验性1.05 A 120   V原型转换器经过设计，开发和测试，以验证理论分析。实验结果表明，该电路适用于电容器充电，以提高TMS的激励性能。