A power management unit （PMU） chip supplying dual panel supply voltage, which has a low electro-magnetic interference （EMI） characteristic and is favorable for miniaturization, is designed. A two-phase charge pump...A power management unit （PMU） chip supplying dual panel supply voltage, which has a low electro-magnetic interference （EMI） characteristic and is favorable for miniaturization, is designed. A two-phase charge pump circuit using external pumping capacitor increases its pumping current and works out the charge-loss problem by using bulk-potential biasing circuit. A low-power start-up circuit is also proposed to reduce the power consumption of the band-gap reference voltage generator. And the ring oscillator used in the ELVSS power circuit is designed with logic devices by supplying the logic power supply to reduce the layout area. The PMU chip is designed with MagnaChip＇s 0.25 μ high-voltage process. The driving currents of ELVDD and ELVSS are more than 50 mA when a SPICE simulation is done.展开更多
Present-day small hydropower plants (SHPs) have a large development potential because of the increasing interest in renewable resources and distributed energy generation, therefore, there are many SHPs in places of Ch...Present-day small hydropower plants (SHPs) have a large development potential because of the increasing interest in renewable resources and distributed energy generation, therefore, there are many SHPs in places of China where are rich in water resources. However, it has caused overvoltages in the distribution network, and which is even worse for the switching overvoltage such as isolated network operation, changing power supply path. The simple network model is used to analyze the reasons of the switching overvoltage, and the simulation software DIgSILENT/PowerFactory is used to check out the results of the theoretical analysis.展开更多
多电源系统在相互切换时因中性线接地方式的不同,将会对不间断电源(uninterruptible power supply,UPS)系统性能产生较大影响。首先,在三极和四极自动转换开关基础上,通过不同接地方式搭建了多电源系统电路等效模型,探讨了不同电路结构...多电源系统在相互切换时因中性线接地方式的不同,将会对不间断电源(uninterruptible power supply,UPS)系统性能产生较大影响。首先,在三极和四极自动转换开关基础上,通过不同接地方式搭建了多电源系统电路等效模型,探讨了不同电路结构的优缺点,并通过搭建MATLAB/Simulink仿真模型,对多电源系统电路性能指标进行了仿真验证;在多电源系统电路基础上,搭建了多电源系统UPS电路MATLAB/Simulink仿真模型,对多电源系统UPS电路关键性能指标进行了仿真实验。其次,以多电源系统UPS电路不产生杂散电流,中性线不分流,中性线接地基准连续,多路输入电源之间、输入电源与输出电源之间、输入电源与旁路电源之间电气隔离等性能指标为优化目标,提出了3种多电源系统UPS电路结构优化方案。最后,搭建3种优化改进电路MATLAB/Simulink仿真模型,对3种UPS电路性能指标进行仿真实验,实验表明改进方案三“多电源系统UPS电源电路加装旁路隔离变压器”具有多电源系统UPS电源电路最优性能指标。展开更多
文摘A power management unit （PMU） chip supplying dual panel supply voltage, which has a low electro-magnetic interference （EMI） characteristic and is favorable for miniaturization, is designed. A two-phase charge pump circuit using external pumping capacitor increases its pumping current and works out the charge-loss problem by using bulk-potential biasing circuit. A low-power start-up circuit is also proposed to reduce the power consumption of the band-gap reference voltage generator. And the ring oscillator used in the ELVSS power circuit is designed with logic devices by supplying the logic power supply to reduce the layout area. The PMU chip is designed with MagnaChip＇s 0.25 μ high-voltage process. The driving currents of ELVDD and ELVSS are more than 50 mA when a SPICE simulation is done.
文摘Present-day small hydropower plants (SHPs) have a large development potential because of the increasing interest in renewable resources and distributed energy generation, therefore, there are many SHPs in places of China where are rich in water resources. However, it has caused overvoltages in the distribution network, and which is even worse for the switching overvoltage such as isolated network operation, changing power supply path. The simple network model is used to analyze the reasons of the switching overvoltage, and the simulation software DIgSILENT/PowerFactory is used to check out the results of the theoretical analysis.
文摘多电源系统在相互切换时因中性线接地方式的不同,将会对不间断电源(uninterruptible power supply,UPS)系统性能产生较大影响。首先,在三极和四极自动转换开关基础上,通过不同接地方式搭建了多电源系统电路等效模型,探讨了不同电路结构的优缺点,并通过搭建MATLAB/Simulink仿真模型,对多电源系统电路性能指标进行了仿真验证;在多电源系统电路基础上,搭建了多电源系统UPS电路MATLAB/Simulink仿真模型,对多电源系统UPS电路关键性能指标进行了仿真实验。其次,以多电源系统UPS电路不产生杂散电流,中性线不分流,中性线接地基准连续,多路输入电源之间、输入电源与输出电源之间、输入电源与旁路电源之间电气隔离等性能指标为优化目标,提出了3种多电源系统UPS电路结构优化方案。最后,搭建3种优化改进电路MATLAB/Simulink仿真模型,对3种UPS电路性能指标进行仿真实验,实验表明改进方案三“多电源系统UPS电源电路加装旁路隔离变压器”具有多电源系统UPS电源电路最优性能指标。
