This paper presents improvement tests based in a feedback-current controller designed to Tracking Maximum Power Point in photovoltaic system (MPPT-PV). Previously, a version was developed exhibiting results satisfacto...This paper presents improvement tests based in a feedback-current controller designed to Tracking Maximum Power Point in photovoltaic system (MPPT-PV). Previously, a version was developed exhibiting results satisfactory in simulation and through of a low cost prototype. Now, using a sophisticated physical model of solar cell available in PSIM program is shown other cases, considering variations both irradiation and temperature to evaluate successfully the controller. The results show that its system is suitable under dynamical changing atmospheric conditions operating with effectiveness acceptable.展开更多
基于高速低功耗混合应用场景下对互补金属氧化物半导体(Complementary Metal Oxide Semiconductor,CMOS)比较器性能的综合需求,系统研究其结构优化设计。阐述动态比较器在响应速度、功耗控制、输入失调与噪声抑制等方面的关键技术,介绍...基于高速低功耗混合应用场景下对互补金属氧化物半导体(Complementary Metal Oxide Semiconductor,CMOS)比较器性能的综合需求,系统研究其结构优化设计。阐述动态比较器在响应速度、功耗控制、输入失调与噪声抑制等方面的关键技术,介绍前置放大器、电源控制、闭环反馈及偏置电路的协同优化策略。结合65 nm CMOS工艺下的仿真测试结果,分析主要性能指标在典型工况下的表现,验证所提结构的可实现性与工程适应性。结果表明,该设计能够在低功耗约束下保持高速响应。展开更多
本文以反激变换器为主电路拓扑,设计了一台80 W LED恒流驱动电源,其控制核心为TL494 PWM芯片,通过电流负反馈实现反馈控制。采用隔离驱动芯片将系统功率部分与控制部分隔离,提高系统的可靠性与抗干扰性。分析了电路的基本结构及其工作原...本文以反激变换器为主电路拓扑,设计了一台80 W LED恒流驱动电源,其控制核心为TL494 PWM芯片,通过电流负反馈实现反馈控制。采用隔离驱动芯片将系统功率部分与控制部分隔离,提高系统的可靠性与抗干扰性。分析了电路的基本结构及其工作原理,并介绍了电路的设计过程,最后给出了实验结果。展开更多
文摘This paper presents improvement tests based in a feedback-current controller designed to Tracking Maximum Power Point in photovoltaic system (MPPT-PV). Previously, a version was developed exhibiting results satisfactory in simulation and through of a low cost prototype. Now, using a sophisticated physical model of solar cell available in PSIM program is shown other cases, considering variations both irradiation and temperature to evaluate successfully the controller. The results show that its system is suitable under dynamical changing atmospheric conditions operating with effectiveness acceptable.
