共查询到19条相似文献,搜索用时 140 毫秒
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为保证三相桥式相控整流器的正常运行,同步电压与主回路电压的相序、相位必须匹配。本文通过研究晶闸管数字触发器的工作原理提出了一种利用线电压与相电压之间的相位关系通过TPL-521光耦,由单片机程序实现对电源相序和缺相的判断进而实现相序的自适应的方法。本装置不使用变压器或电压互感器而是直接从电源线接入,采集到的线电压过零点正好是相电压的自然换相点,容易实现控制角度与时间之间对应关系的计算。 相似文献
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应用P87C591单片机对管道气体检测系统进行设计,检测项目包括温度、压力和流量,并且具有设置检测参数和显示测量值的功能。管道气体检测系统的设计充分利用了P87C591的软、硬件资源,通过I2C总线组成了测量系统。系统适用于测量点多、测量精度要求高的场合,且易于扩展。 相似文献
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采用AT89C51单片机作为数控模块核心,以通过按键调节可输出0~18 V连续可调电压,电压调节分粗调与细调,粗调步进电压为1V,细调步进电压为0.05 V,液晶屏显示输出电压.稳压输出电路含过流检测电路,通过中断实现软件过流保护和报警.测试结果表明,该电源满足设计要求,可用于实验教学和工程应用中. 相似文献
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一种宽输入自适应电源 总被引:2,自引:0,他引:2
文中提出一种宽电压(85-825V)自适应电源的设计方案,并论述其软硬件设计方法。该电源主电路采用晶闸管控制的方式,控制电路采用基于uPD78F9202单片机的PWM技术和瞬时电压跟踪控制策略。该电源实现了对宽范围输入电压的自动适应,具有很高的实际意义和应用价值。 相似文献
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电瓶车具有出行方便、操作简单、低碳环保等优点,成为许多人近距离出行首选的交通工具。现有的电瓶车电源模块一般使用单电源供电系统,偶有掉电现象发生,使得电瓶车无法正常工作。为了解决该问题,该文基于STC89C52单片机设计了一种双电源电瓶车防掉电控制系统,该系统以STC89C52单片机及其外围电路作为主控单元,分别连接主电源模块、副电源模块、显示模块、电机采样模块、模数转换模块。当STC89C52单片机通过继电器开关检测到主电源模块发生掉电或者供电电压过低时,通过三极管开关启动副电源模块,实现主电源和副电源之间的切换,从而完成电瓶车防掉电的智能化,进一步通过Proteus软件对该系统进行仿真,结果表明该系统性能良好,能够成功解决电瓶车掉电问题。 相似文献
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采用AT89C51单片机作为数控模块核心,以通过按键调节可输出0-18V连续可调电压.电压调节分粗调与细调,粗调步进电压为1V,细调步进电压为0.05V,液晶屏显示输出电压。稳压输出电路舍过流检测电路.通过中断实现软件过流保护和报警。测试结果表明,该电源满足设计要求,可用于实验教学和工程应用中。 相似文献
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针对三相电源自然换相点检测过程中存在的检测电路复杂、检测不精确的问题,设计了一种新型的三相电源自然换相点的检测方法。该方法以Atmega16单片机为核心,使用LTV-816C光耦和简单的元器件实现了对三相电源自然换相点的检测,进而通过软件实现了对三相电源的频率、相序以及是否缺相作出判断和检测,该设计结构简单,具有较高的可靠性和精确性。该设计通过了Saber仿真,并且制作了相应的硬件,验证了该设计的可靠性和精确性[1]。 相似文献
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为了解决常用的逆变器所带来的问题,我们提出一种新型的带升降压功能的三相DC/AC变换器拓扑,并介绍了其工作原理。借助于PSIM仿真软件,对单相和三相电路进行了仿真研究,提出了由单相组成三相电压输出的构成方法。在列出仿真参数的前提下,给出了负载电压,负载电流以及调制给定电压和逆变器输出电压的仿真结果。仿真结果表明三相DC/AC逆变器可以实现50 kHz高频功率变换下宽输入电压范围工频逆变输出,证明了理论分析的正确性。 相似文献
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Campos A. Joos G. Ziogas P. Lindsay J. 《Industrial Electronics, IEEE Transactions on》1992,39(2):159-167
Voltage unbalance typically present in three-phase AC supply systems adversely affects power system components, static converters, drive systems, electric machines, etc., connected to the system. A method to eliminate this unbalance by means of a voltage compensator connected in series with the supply through transformers is described. The technique is based on extracting the negative sequence voltage component of the supply and canceling it in order to obtain balanced voltages. The positive sequence component is then adjusted to achieve voltage regulation. It is shown that the compensation can be achieved with low kilovolt-ampere inverters and that harmonic injection is reduced to a minimum. The authors include implementation principles, design equations, and a design example. Simulated and experimental results confirm the theoretical concept and feasibility of the proposed system 相似文献
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Hurng-Liahng Jou Jinn-Chang Wu Kuen-Der Wu Hong-Ren Shen 《International Journal of Electronics》2018,105(11):1962-1975
A conventional DC-AC inverter can only output either a single-phase AC voltage or a set of three-phase AC voltages. A new three-port DC-AC inverter which can simultaneously output a single-phase AC voltage and a set of three-phase AC voltages is proposed in this paper. This three-port DC-AC inverter is based on the three-port T-type multi-level power converter which is composed of three T-type power electronic legs, a decoupling transformer set, a filter inductor set, a single-phase filter capacitor, and a three-phase filter capacitor set. The DC port of the proposed power converter is connected to a DC power source to act as the input port, and the single-phase AC port and the three-phase AC port serve as two output ports to supply power to the single-phase load and the three-phase load, respectively. The zero-sequence transformer is used to decouple the single-phase and three-phase AC components, which are generated by the three T-type power electronic legs. The operation principle of this three-port DC-AC inverter is analyzed, and a hardware prototype is established to verify the performance of the proposed three-port DC-AC inverter. The experimental results are as expected. 相似文献