为研究减小单电感双输出(single-inductor dual-output,SIDO)Buck变换器输出支路间交叉影响的控制方法,该文以工作于电感电流连续导电模式(continue conduction mode,CCM)的SIDO Buck变换器为研究对象,描述其工作原理和开关状态,推导出...为研究减小单电感双输出(single-inductor dual-output,SIDO)Buck变换器输出支路间交叉影响的控制方法,该文以工作于电感电流连续导电模式(continue conduction mode,CCM)的SIDO Buck变换器为研究对象,描述其工作原理和开关状态,推导出状态空间平均模型,并建立了SIDO CCM Buck变换器的功率级小信号模型。在此基础上,提出电容电流–电容电压纹波控制(capacitor current and capacitor voltage ripple controlled,CCVR) SIDO CCM Buck变换器,对其控制原理进行阐述,并建立了小信号模型。进一步地,分析了变换器输出支路间的交叉影响。结果表明:相比传统峰值电流型控制(peak current mode controlled,PCM) SIDO CCM Buck变换器,CCVR SIDO CCM Buck变换器可有效减小输出支路间的交叉影响。最后,由设计的CCVR SIDO CCM Buck变换器实验电路,验证了理论分析的正确性。展开更多
对于环境中存在的各种类型能量源,其往往具有不同的阻抗特性以及输出功率范围。为了提高能量收集系统的能量萃取能力,合理的接口电路设计是关键。基于此,通过对环境中光伏(Photovoltaic,PV)能量源微弱直流特性以及高效率收集和转化的研...对于环境中存在的各种类型能量源,其往往具有不同的阻抗特性以及输出功率范围。为了提高能量收集系统的能量萃取能力,合理的接口电路设计是关键。基于此,通过对环境中光伏(Photovoltaic,PV)能量源微弱直流特性以及高效率收集和转化的研究,在传统开路电压法(Open-Circuit Voltage,OCV)的基础上,结合输入电压纹波控制,提出了一种可实时最大功率点追踪(Maximum Power Point Tracking,MPPT)的预估算法。该预估算法根据能量源的输出特性,采用了分数开路电压法(Fractional Open-Circuit Voltage,FOCV),并根据纹波大小动态调节变换器的工作模式,实现阻抗匹配。为了尽可能减小因采样带来的能量损失,采用可片上全集成的较小的采样电容,并逐周期的进行开路电压采样和计算,实现了对源功率变化的高精度追踪。仿真结果表明,所提出的追踪算法能够实时监测能量源的状态,具有高的追踪速度和追踪精度,且采样时间仅需100 ns。能量源功率在1μW~10 mW范围内变化时,最短的追踪时间仅需4.37μs,追踪精度可达99.7%。展开更多
A method of feedforward compensation for electromotive force(EMF) in the single-phase permanent magnet linear generation system and a research in the performance of the single-phase PMLG system are presented.A general...A method of feedforward compensation for electromotive force(EMF) in the single-phase permanent magnet linear generation system and a research in the performance of the single-phase PMLG system are presented.A general mathematical model for the single-phase permanet magnet linear generator(PMLG) system is established and the current loop,voltage loop and the feedforward control are studied based on it for the control system.Then this paper analyses the transfer function of the power system,optimizes current loop and voltage loop parameters by engineering algorithm,and calculates the optimal control parameters.An EMF feedforward compensation method is developed to optimize the control system which improves dynamic performance of the power system but does not affect the steady-state performance.The result of this research verifies the correctness and rationality of the design for the control system.展开更多
文摘为研究减小单电感双输出(single-inductor dual-output,SIDO)Buck变换器输出支路间交叉影响的控制方法,该文以工作于电感电流连续导电模式(continue conduction mode,CCM)的SIDO Buck变换器为研究对象,描述其工作原理和开关状态,推导出状态空间平均模型,并建立了SIDO CCM Buck变换器的功率级小信号模型。在此基础上,提出电容电流–电容电压纹波控制(capacitor current and capacitor voltage ripple controlled,CCVR) SIDO CCM Buck变换器,对其控制原理进行阐述,并建立了小信号模型。进一步地,分析了变换器输出支路间的交叉影响。结果表明:相比传统峰值电流型控制(peak current mode controlled,PCM) SIDO CCM Buck变换器,CCVR SIDO CCM Buck变换器可有效减小输出支路间的交叉影响。最后,由设计的CCVR SIDO CCM Buck变换器实验电路,验证了理论分析的正确性。
文摘对于环境中存在的各种类型能量源,其往往具有不同的阻抗特性以及输出功率范围。为了提高能量收集系统的能量萃取能力,合理的接口电路设计是关键。基于此,通过对环境中光伏(Photovoltaic,PV)能量源微弱直流特性以及高效率收集和转化的研究,在传统开路电压法(Open-Circuit Voltage,OCV)的基础上,结合输入电压纹波控制,提出了一种可实时最大功率点追踪(Maximum Power Point Tracking,MPPT)的预估算法。该预估算法根据能量源的输出特性,采用了分数开路电压法(Fractional Open-Circuit Voltage,FOCV),并根据纹波大小动态调节变换器的工作模式,实现阻抗匹配。为了尽可能减小因采样带来的能量损失,采用可片上全集成的较小的采样电容,并逐周期的进行开路电压采样和计算,实现了对源功率变化的高精度追踪。仿真结果表明,所提出的追踪算法能够实时监测能量源的状态,具有高的追踪速度和追踪精度,且采样时间仅需100 ns。能量源功率在1μW~10 mW范围内变化时,最短的追踪时间仅需4.37μs,追踪精度可达99.7%。
基金Supported by the National High Technology Research and Development Program of China(No.2006AA05Z231)the National Natural Science Foundation of China(No.51177025)
文摘A method of feedforward compensation for electromotive force(EMF) in the single-phase permanent magnet linear generation system and a research in the performance of the single-phase PMLG system are presented.A general mathematical model for the single-phase permanet magnet linear generator(PMLG) system is established and the current loop,voltage loop and the feedforward control are studied based on it for the control system.Then this paper analyses the transfer function of the power system,optimizes current loop and voltage loop parameters by engineering algorithm,and calculates the optimal control parameters.An EMF feedforward compensation method is developed to optimize the control system which improves dynamic performance of the power system but does not affect the steady-state performance.The result of this research verifies the correctness and rationality of the design for the control system.
