脉冲跨周期调制模式（PSM）的技术研究

【作者】 熊富贵；

【导师】 李肇基；

【作者基本信息】 电子科技大学 ， 微电子学与固体电子学， 2005， 硕士

【摘要】 迄今,智能功率集成电路(SPIC)习用控制模式为恒频变宽(CFVW)的脉宽调制模式(PWM)和恒宽变频(CWVF)的脉频调制模式(PFM)。PWM 调制模式的SPIC在低负载下效率较低,控制脉冲谐波峰值较大;PFM 控制电路较为复杂,谐波分布时变且过于分散,给后续滤波器设计到来困难。脉冲跨周调制模式(PSM, PulseSkip Modulation)是本人所在课题小组在设计实践中提出的一种全新的调制模式, 异于PWM 和PFM,是一种恒宽恒频(CWCF)的调制模式。小组发展了PSM 系统理论, 包括建立PSM 变换电路状态空间平均模型和大信号模型;大信号解析模型、离散迭代模型和相平面模型。研究表明PSM 能有效改善SPIC 开关变换系统的效率和EMI 特性,且具响应速度快,抗干扰能力强,鲁棒性强,电路易于实现等特点。本文作者有幸参与小组关于PSM 调制模式的研究工作,并在老师的指导下着重研究了PSM 模式的算法, 包括1) 基于模糊控制理论的模糊跨周期调制算法。根据模糊控制理论及其设计 方法来设计PSM 变换系统,以期改善PSM 调制系统较大的超调和纹波。2) 状态机优化的PSM 调制算法。利用状态机较强的调节能力,使得系统根 据负载的轻重来确定占空比和跨周数,以期较好地改善系统输出电压纹 波。3) PSM 调制算法。完全是根据PSM 调制模式的机理来设计的算法,主要用 来研究PSM 调制系统呈现的一些特点,并为进一步设计优化的PSM 算法 打下基础。此外,本文探悉了PSM 非线性行为,根据PSM 调制模式的离散迭代模型研究PSM 变换器系统的混沌行为,并与PWM 变换器系统中的混沌现象作比较分析。本文还设计了基于FPGA 设计方案的开关电源系统,包括PSM 调制算法,状态机优化的PSM 调制算法及基于Fuzzy 控制理论的模糊跨周期调制算法。并给予理论研究、模型设计和特性分析。分析研究表明,本论文提出的SPIC 的PSM 和FPSM 调制算法对提高SPIC 变换电路与系统的效率、改善其响应特性及输出电压纹波、避免系统进入音频陷阱等具有明显作用。PSM 非线性行为的研究表明PSM 对混沌具有天然的免疫力。更多还原

【Abstract】 Up to now, the normal control mode for smart power integrated circuit (SPIC) isPWM and PFM. PWM bases on CFVW (Constant Frequency Variable Width) controlpulse, whereas, PFM bases on CWVF (Constant Width Variable Frequency) controlpulse. PWM converter has low efficiency with light loads and high amplitudeharmonic. On the other hand, the control circuit and filter for PFM are much complex.PSM (Pulse Skip Modulation) which bases on CWCF (Constant Width ConstantFrequency) control pulse is a novel modulation which firstly proposed by our projectgroup, this kind modulation mode operates in constant width and constant frequencymode (CWCF) which differs from the fore two. The PSM theory includes The statespace average mode and the large signal mode of PSM; big signal resolution mode,discrete iterative mode and phase plane mode. The work shows that PSM converterwould improve its efficiency and suppress EMI and that it also has many virtuesincluding quick response speed, strong interference rejection and strong robust andthat it is easy to realize.The author of the dissertation has an honor to participate the PSM work, withhelp offered by tutor, the author pay a lot efforts which focus on studying modelingthe PSM algorithm, include:1). the optimized PSM algorithm basing on the fuzzy control theory. Based on the fuzzy control theory and fuzzy system design way, the PSM switching system is designed in order to better the overshoot and wave ripple of output voltage.2). the PSM algorithm optimized by state machine. By the robust adjust ability, the duty ratio and the skipped number are calculated through detecting the load.3). The PSM algorithm. The algorithm is designed by PSM modulation principle and the work aims at acquiring the behavior of PSM and bettering it.Besides, the dissertation study the nonlinear behavior of PSM, the research of thenonlinear behavior focuses on the study on the chaos of PSM switching convertersystem basing on the discrete model of PSM.Basing on the PSM algorithm, a switching converter system realized by FPGA isdesigned, which include pure PSM algorithm, the PSM algorithm optimized by statemachine and the optimized PSM algorithm basing on the fuzzy control theory. And all更多还原