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设计一种通用电源管理芯片,同时支持Sepic或Boost转换器,采用0.6?m BiCMOS工艺实现.开关频率为500KHZ,具有较宽的输入电压范围(1.8V~5.5V)和高转换效率.提出设计过程中会遇到的问题,并给出解决方案.仿真及实验测试结果充分验证芯片的各项性能. 相似文献
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合理选择DC-DC转换器 总被引:1,自引:0,他引:1
魏智 《单片机与嵌入式系统应用》2002,(1):48-50
讨论线性稳压器、开关型DC-DC转换器、电荷泵等三种DC-DC转换器的特点、如何选用以及应用中的相关问题. 相似文献
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简要介绍了采用太阳能作为能源的水体净化装置和光伏电源系统的特性及最大功率点跟踪的基本原理.提出了一种采用干扰观测法配合Sepic拓扑的斩波电路实现太阳能电池最大功率点跟踪控制方法,即将太阳能电池和Sepic斩波电路作为一个整体,直接根据检测到的电池功率变化来控制Sepic电路的占空比来跟踪最大功率点,这些改进使得系统简化. 相似文献
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针对LCC-S型拓扑网络的实际负载值偏离最优负载的问题,利用后级级联Sepic变换器实现了宽范围阻抗匹配,并由前级直流输入电源控制输出稳压。首先,利用互感模型分析了LCC-S型拓扑谐振状态下的网络特性,得到传输特性及最优负载值;其次,对后级Sepic变换器在开关管导通和断开时的工作模式进行分析,阐释了Sepic电路实现... 相似文献
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介绍普通Boost 变换器和Boost-ZVT变换器的工作原理,指出Boost 变换器的开关管工作在硬开关状态,而Boost-ZVT变换器的主开关管工作在软开关状态。通过理论分析可以知道Boost-ZVT变换器的效率更高,然后将两种电路应用于单相功率因数校正电路中。最后在Pspice软件环境下搭建功率因数校正电路Boost变换器与Boost-ZVT变换器的仿真模型并进行仿真,并对仿真结果进行分析和比较,指出了它们各自的优点与缺点。 相似文献
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The Brushless DC Motor drive systems are used widely with renewable energy resources. The power converter controlling technique increases the performance by novel techniques and algorithms. Conventional approaches are mostly focused on buck converter, Fuzzy logic control with various switching activity. In this proposed research work, the QPSO (Quantum Particle Swarm Optimization algorithm) is used on the switching state of converter from the generation unit of solar module. Through the duty cycle pulse from optimization function, the MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) of the Boost converter gets switched when BLDC (Brushless Direct Current Motor) motor drive system requires power. Voltage Source three phase inverter and Boost converter is controlled by proportional-integral (PI) controller. Based on the BLDC drive, the load utilized from the solar generating module. Experimental results analyzed every module of the proposed grid system, which are solar generation utilizes the irradiance and temperature depends on this the Photovoltaics (PV) power is generated and the QPSO with Duty cycle switching state is determined. The Boost converter module is boost stage based on generation and load is obtained. Single Ended Primary Inductor Converter (SEPIC) and Zeta converter model is compared with the proposed logic; the proposed boost converter achieves the results. Three phase inverter control, PI, and BLDC motor drive results. Thus the proposed grid model is constructed to obtain the better performance results than most recent literatures. Overall design model is done by using MATLAB/Simulink 2020a. 相似文献
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以光伏发电系统模型为基础,把直流变换器中的Boost电路作为研究对象,先分别采用占空比恒定的定脉宽调制和占空比可调节的传统PI控制作为控制方法,利用MATLAB/Simulink仿真工具搭建光伏发电系统的主电路模型,进而分别根据不同的控制方法对Boost电路进行仿真分析。由仿真分析得到,定脉宽调制控制和传统PI控制的参数设置均无法适应实际工况的变化。基于此,提出一种模糊PI控制算法,通过对传统PI控制的参数设定进行实时调整,改善Boost电路的输出电压,使系统能更好地克服实际运行工况变化带来的不利影响。通过仿真分析可得,模糊PI控制的鲁棒性增强,并且能够降低系统的输出电压超调,缩短系统的稳定时间,提升系统的抗干扰能力。 相似文献
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Due to undesirable interference via unintended coupling paths, switching converters may exhibit complex intermittency, which appears as a form of bifurcation undergoing regular operation, subharmonics, and chaos orderly and repeatedly for a long period of time. Such intermittent operation, being an unwanted operating state, should normally be avoided in power converters. This paper expounds the mechanism and conditions for the emergence of intermittency in a common current-mode controlled Boost converter. It is found that interference at frequencies near the switching frequency or its rational multiples may induce intermittent operation. The strengths and frequencies of the interfering signals determine the type and period of intermittency. The problem is analyzed by transforming the time-bifurcation analysis to a conventional parameter-bifurcation analysis. Based on this transformation, intermittency can be investigated from the bifurcation control viewpoint. Furthermore, the critical circuit parameter conditions for the emergence of intermittency can be predicted and compared with those from circuit simulation. 相似文献