中文摘要：

利用解析方法和电路模拟方法研究了阻抗变换器功率传输效率的优化设计。电路计算中，采用了脉冲上升沿等效的正半周正弦波作为输入波形的假设，并忽略了水介质能量损失的影响。首先对比厂线性、饱和型变化和陡变型变化3种典型阻抗的功率和能量传输效率，分析讨论了影响指数型阻抗变换器功率传输效率的关键影响因素，并得到了功率传输效率最大化的中间参数和符合系数的参数范围。讨论了实际设计中应注意的绝缘安全系数的结构设计、杂散参数对阻抗计算的影响、水介质能量损失等问题。

英文摘要：

The paper investigates the optimization design of power efficiency of exponential impedance transformer with ana- lytic method and numerical method. In numerical calculation, a sine wave voltage with hypothesis of rising edge equivalence is re garded as the forward-going voltage at input of transformer, and its dominant angular frequency is determined by typical rise-time of actual voltage waveforms. At the same time, dissipative loss in water dielectric is neglected. The numerical results of three typ ical modes of impedance transformation, viz. linear mode, saturation mode and steep mode, are compared. Pivotal factors which affect the power efficiency of exponential impedance transformer are discussed, and a certain extent quantitative range of interme- diate variables and accordance coefficients are obtained. Finally, the paper discusses some important issues in actual design, such as insulation safety factor in structure design, effects of coupling capacitance on impedance calculation, and dissipative loss in water dielectric.