通过用电源适配器芯片CR6850C设计并制作12V5A开关电源 AC/DC；DC/AC;仿真分析波形图
上传时间： 2013-11-13
上传用户：refent
此提出了一种基于Matlab／Simulink及实时代码生成工具R哪(Real．Time Workshop)的电力电子与电力传动控制系统软件的设计方法。首先在Simulink下搭建控制系统模型，进行相应仿真完善，验证控制算法，根据目标DSP型号添加相应DSP内核、外设并设置控制参数，然后直接将模型转化为相应DSP的C源代码．在相应的硬件平台支持下即可完成相关实验。
上传时间： 2013-11-04
上传用户：wincoder
根据多用等鸯子切焊机的开关电源变压器漏盛大的特点，采用全桥移相电路，并在其两臂之间串联D—L—R电路，实现摹电匾切换。
上传时间： 2013-10-24
上传用户：432234
基于高频谐振电路研制的高压脉冲电容器充电电源, 采用IGBT 构成电源的软开关电路和闭环变频控制充电电流的方式。对输出端负载大范围变化引起的谐振频率漂移, 采用微调开关时间, 保证了变换器开关零切换, 显著降低了导通、关断时IGBT 的损耗.
上传时间： 2014-12-24
上传用户：aeiouetla
开关电源（直流变换器）的类型很多，从输入输出有无隔离角度，开关电源主回路可以分为隔离式与非隔离式两大类型。这两种类型中又各自包含有不同的电路拓扑种类。每种结构都有各自的特点，适用于不同的应用场合，下边将对各种开关电源拓扑结构简要叙述和比较。
上传时间： 2013-11-20
上传用户：cjh1129
Piezoelectric motors are used in digital cameras for autofocus,zooming and optical image stabilization. Theyare relatively small, lightweight and effi cient, but theyalso require a complicated driving scheme. Traditionally,this challenge has been met with the use ofseparatecircuits, including a step-up converter and an oversizedgeneric full-bridge drive IC. The resulting high componentcount and large board space are especially problematicin the design of cameras for ever shrinking cell phones.The LT®3572 solves these problems by combining astep-up regulator and a dual full-bridge driver in a 4mm× 4mm QFN package. Figure 1 shows a typical LT3572Piezo motor drive circuit. A step-up converter is usedto generate 30V from a low voltage power source suchas a Li-Ion battery or any input power source within thepart’s wide input voltage range of 2.7V to 10V. The highoutput voltage of the step-up converter, adjustable upto 40V, is available for the drivers at the VOUT pin. Thedrivers operate in a full-bridge fashion, where the OUTAand OUTB pins are the same polarity as the PWMA andPWMB pins, respectively, and the OUTA and OUTB pinsare inverted from PWMA and PWMB, respectively. Thestep-up converter and both Piezo drivers have their ownshutdown control. Figure 2 shows a typical layout
上传时间： 2013-11-18
上传用户：hulee
In a recent discussion with a system designer, the requirementfor his power supply was to regulate 1.5Vand deliver up to 40A of current to a load that consistedof four FPGAs. This is up to 60W of power that must bedelivered in a small area with the lowest height profi lepossible to allow a steady fl ow of air for cooling. Thepower supply had to be surface mountable and operateat high enough effi ciency to minimize heat dissipation.He also demanded the simplest possible solution so histime could be dedicated to the more complex tasks. Asidefrom precise electrical performance, this solution had toremovethe heat generated during DC to DC conversionquickly so that the circuit and the ICs in the vicinity do notoverheat. Such a solution requires an innovative designto meet these criteria:
上传时间： 2013-11-24
上传用户：defghi010
摘要:双脉宽调制(PWM)控制的交—直—交电压型变频器适于用做交流励磁发电机的励磁电源,但交流励磁发电机运行状态的改变会引起双PWM交—直—交变频器直流链电压的波动,不利于整个发电系统的稳定运行。文中结合交流励磁发电机的运行特点,深入分析了直流链电压波动的原因,提出了基于转子侧变换器瞬时功率反馈控制的双PWM控制策略。实验结果验证了所提出的改进控制策略的正确性,该方法可有效维持发电机运行状态突变时直流链电压的稳定,大大增强了发电机系统的动态响应能力和稳定性。 关键词:交流励磁发电机;励磁电源;双PWM交—直—交变频器;直流链电压;瞬时功率反馈控制
上传时间： 2013-11-03
上传用户：wangjin2945
高功率因数、高效率、低噪音是电源装置和用电设备普遍追求的品质。本文以单相有源功率因数校正控制器和高性能功率模块的研制、开发为依托，对其从理论和应用开发两个方面进行了较为全面的研究和讨论。
上传时间： 2014-01-22
上传用户：llwap
在三相PWM 整流器的功率管驱动信号中加入死区时间可防止电压直通,但这会对变换器的电压电流波形产生影响,称之为死区效应。为此,详细描述了死区时间内变换器的工作过程,提出了三相PWM 整流器的死区电压效应和电流效应,并分别进行了定量分析。然后结合空间矢量调制策略,引入了死区效应空间矢量的概念,统一并从本质上解释了死区的两种效应。为了克服死区效应的不良影响,提出了两种补偿措施,并详细介绍了利用DSP 的数字实现方法,这两种措施均不需要改变硬件电路,也不会增加控制器的复杂度和负担。最后,通过实验验证了理论分析的正确性和补偿措施的有效性,还指明了进一步研究的方向。
上传时间： 2013-10-21
上传用户：Aeray
