基于状态空间法的无接触供电pdm调制建模.pdfVIP

20 14 年 11 月 电 工 技 术 学 报 Vol.29 No. 11 第 29 卷第 11 期 TRAN SACTION S OF CHINA ELECTROTECHNICAL SOCIETY Nov . 20 14 基于状态空间法的无接触供电 PDM 调制建模 张炯 楼佩煌 钱晓明 武星 （南京航空航天大学机电学院 南京 2 100 16 ） 摘要 为了实现高阶非线性的 CPT 系统的能量调节，根 不动点理论和状态空间法，建立 了系统的频闪映射模型，推导出了系统的稳态响应分段解析函数式，提出了基于 PDM 能量调 制的系统工作模式。文中推导了系统开关边界状态不动点函数，计算了系统在 PDM 控制模式 下的控制参数，验证了逆变器的软开关特性。计算表明在不同的脉冲密度下电流频率近似相等； 且建立的样机系统实际测试，也证明了本文的稳态建模方法和求解的正确性。 关键词：无接触供电 不动点 状态空间 脉冲密度调制 软开关 中图分类号：TM 132 Pulse Density Modulation on Contactless Power Transfer System Using State-Space Method Zhang J iong L ou P eihuang Qian X iaoming Wu X ing （Nanj ing University of Aeronautics and Astronautics Nanj ing 2 100 16 China ） Abstract In order to regulate energy of contactless power transfer system which are usually high order nonlinear, a general stroboscopic mapping model is created based on fixed points theory and state-space method. The equations for calculating the periods and the steady-state waveforms are inferred, and the system working mode is presented using pulse density modulation . Then, the boundary condition equations are derived, based on which, the control parameters of PDM are given by numerical calculation . The soft switching is accomplished. Analysis shows that the current frequency is approximate under different pulse densities which is of benefit to pickup . Finally, the steady-state mode and its solution are verified by prototype and experiment . Keywords ：Contactless power transfer(CPT), fixed points, state space, pulse density modulation (PDM), soft switching [7]