在DCM状态下选择:Uin-电源输入直流电压Uinmin-电源输入直流电压最小值D-占空比Np-初级绕组匝数Lp-初级绕组电感量Ae-磁芯有效面积Ip-初级峰值电流f-开关频率Ton-开关管导通时间I-初级绕组电流有效值η-开关电源效率J-电流密度
上传时间: 2013-12-16
上传用户:我们的船长
摘要:采用通用电路分析软件PSPICE,在保证模拟电路精度的情况下,建立实时电路仿真模型,进而对开关电源系统进行计算机实时仿真分析,对开关电源闭环控制系统动态响应过程及稳态过程的仿真分析表明,该方法可优化系统的设计方案,验证理论设计的可行性.关键词:开关电源;仿真分析;电路模型;反激式
上传时间: 2013-10-24
上传用户:liaofamous
一、变压器Np、Ns、Lp的计算二、如果要计算气隙长度Lg三、开关管Vce、Ic的计算(非连续)五.输出整流二极管Id、Vd的计算Flyback输出滤波电容设计流过输出电容C的纹波电流Ic=I2- Io 其中:I2为次级线圈电流 Ic的有效值可由下式计算:Icrms=[Ton/3T(I2p^2-I2pIo+Io^2 )+(Toff/T)* Io^2]^1/2 其中I2p=2io/(1- δmax) 此为输入电压最低、输出功率最大时状态。
上传时间: 2013-11-22
上传用户:aesuser
内容提要: 单片机外围器件实用手册输入通道器件 D570,571,574,系列模/数变换器 AD,ADC系系列模/数变换器 MAX变换器各个模块的介绍
上传时间: 2014-01-23
上传用户:zhangfx728
PIC16C54C为8位单片机,指令字长12位,全部指令都是单字节指令,系统为哈佛结构,数据总线和程序总线各自独立分开,数据总线宽度为8位,程序总线宽度为12位,内部程序存储器为512×12位,内部数据寄存器为32×8位。 PIC16C54C有12根双向可独立编程I/O引脚,分为PortA和PortB两个端口,其中PortA为RA0~RA3,PortB为RB0~RB7,每根I/O引脚可由程序来编程决定其输入输出方向。 PIC16C54C提供四种可选振荡方式: - RC,低成本的阻容振荡方式 - XT,标准晶体/陶瓷振荡 - HS,高速晶体/陶瓷振荡 - LP,低功耗,低频晶体振荡 更多锁相环知识请访问 http://www.elecfans.com/zhuanti/PLL.html
上传时间: 2013-12-23
上传用户:dianxin61
针对科研实验中对拉压千斤顶加载过程控制的需要,采用ATmega128单片机控制步进电机进而实现对执行系统的电动泵站实行自动控制。对力和位移的数据采集与处理及用步进电机控制电动泵站手柄的技术细节作了重点描述。通过单片机的A/D变换器对AMP放大模块采集的电桥信号作量化处理,千斤顶的操控手柄位置依电动油泵阀门开启的方向和大小作若干定位,单片机根据力或位移传感器信号,实时控制步进电机驱动手柄旋转到相应操控位置。 Abstract: This article describes the use of ATmega128 AVR microcontroller series of DBS electric pumping stations and QF100/200 separate twoway hydraulic jack to automate the process of manipulating the work of the technical content. Articles on force and displacement data acquisition and processing, and stepper motor control electric pump with the handle of the key technical details were described. Through the MCU’s A / D converter module is collected on the AMP amplification quantify the signal bridge, jack handle position control valve opening according to the direction of electric pumps for a number of positioning and size of the microcontroller based on force or displacement sensor signals, real-time control stepper motor drive control handle rotate to the appropriate location.
上传时间: 2014-01-16
上传用户:hasan2015
为了有效地提升铅酸蓄电池的使用寿命,同时实现对充电过程的监控,设计出一种用单片机控制的36 V铅酸蓄电池充电电源。本电路采用反激式拓扑,连续电流工作模式,电源管理IC设计在电源的副边,由ELAN公司的EM78P258N单片机模拟,是用可编程器件模拟电源管理IC,实现智能电源低成本化的一次成功尝试,通过对单片机的软件设计实现了充电电源的状态显示、充电时间控制、报警、过温保护、过压保护、过流保护等功能。本充电器真正的实现了铅酸蓄电池的三段式充电过程,其最高输出功率可达90 W,效率约85%,成本不到20元,具有很高的市场竞争力。 Abstract: In order to extend the life of lead-acid battery efficiently and supervise the charging process meanwhile, a 36V lead-acid battery charge powe supply controlled by microcontroller is designed. The charger is flyback switching power supply and works in CCM mode. A EM78P258N microcontroller made by ELAN microelectronics corporation is used as power management IC which is designed at the secondary circuit. The project is a successful attempt to low-cost intelligent power used microcontroller simulating power management IC. The charger also has the functions of the status reveal, charge time control, alarming, thermal protect, current limit and overvoltage protect by the software design. The circuit actually implements the three-step charge process, whose power is up to 90W and whose efficiency can get 85%. The net cost of this charger is less than 20 RMB, so that the charger is of powerful market competitiveness.
上传时间: 2013-11-16
上传用户:cepsypeng
序号 参数 数据 单位 参数 说 明 . 输 入 参 数 变 量 1 umin V 交流输入电压最小值 2 umax V 交流输入电压最大值 3 fL Hz 电网频率 4 f kHz 开关频率 5 UO V 直流输出电压 6 PO W 输出功率 7 η % 电源效率 8 Z 0.5 损耗分配系数 9 UFB V 反馈电压
上传时间: 2013-10-14
上传用户:小码农lz
为深入了解基于UC3854A控制的PFC变换器中的动力学特性,研究系统参数变化对变换器中分岔现象的影响,在建立Boost PFC变换器双闭环数学模型的基础上,用Matlab软件对变换器中慢时标分岔及混沌等不稳定现象进行了仿真。在对PFC变换器中慢时标分岔现象仿真的基础上,分析了系统参数变化对分岔点的影响,并进行了仿真验证。仿真结果清晰地显示了输入整流电压的幅值变化对系统分岔点的影响。 Abstract: In order to better understand the dynamics characteristic of power factor correction converter based on UC3854A, and make the way that parameters change influences the bifurcation phenomena of the system clearly. The math model of the two closed loop circuits to the Boost PFC (Power Factor Correction) converter controller was built. Then, with the help of Matlab, the simulation for nonlinear phenomena such as chaos and slow-scale bifurcation in the PFC converter was made. Finally the factors that have influence to the phenomenon of bifurcation under slow-scale in PFC converter were analyzed. The simulation results clearly show the parameters change influences the bifurcation point of the system.
上传时间: 2013-10-17
上传用户:杜莹12345
摘要:研究了用单片机控制的单相后备式方波输出UPS的控制技术及实现,分析了系统的工作原理,给出了硬件实现电路和算法框图,并测出了市电逆变相互转换等主要实验结果。关键词:不间断电源;单片机;推挽变换器
上传时间: 2013-10-28
上传用户:1051290259