Intersil推出新型同步降压稳压器

正Intersil公司推出适用于复杂工业和医疗系统的同步降压稳压器——ISL85410和ISL85418。这些新型降压稳压器能够对来自电源或电池的直流电压进行高效的降压转换,为多个微处理器和电路板元件供电,满足各种电压要求,最大程度减小功率损耗。ISL85410/18向工程师提供最大的灵活性,支持宽输入和输出电压范围,并且二者     

Intersil新款双同步降压稳压器大大延长电池寿命

Intersil公司对其广受欢迎的双通道集成式FET降压稳压器产品家族进行扩展,推出3个系列可提供最高95%功率转换效率并向设计人员提供更大灵活性的新产     

具DDR存储器的双通道3A、4MHz同步降压型稳压器

<正>现在可提供高达+150℃的高可靠性H级和军用MP级版本2013年12月19日,凌力尔特公司(Linear Technology Corporation)在加利福尼亚州米尔皮塔斯(MILPITAS,CA)推出高效率、4MHz同步降压型稳压器LTC3615和LTC3615-1新的高可靠性H级和军用MP级版本,这些器件采用恒定频率、电流模式架构。电阻很低的内部开关使LTC3615的每通道能提供高达3A的连续输出电流,同时其低压差工作可提供范围从0.6V到仅比V_(IN)低几毫伏的输出电压。LTC3615在2.25V~5.5V的输入     

4A、4MHz同步降压型稳压器 适用于-55℃～+125℃工作温度范围

<正>2008年3月18日,凌力尔特公司(Linear Technology Corporation)宣布推出LTC3414塑封TSSOP-20版本。该器件是一个高效率、4MHz同步降压型稳压器,     

凌力尔特采用4mm×4mm QFN封装的同步降压型稳压器

凌力尔特公司（Linear Technology Corporation）推出高效率、3MHz同步降压型稳压器LTC3602,该器件采用恒定频率、电流模式架构。LTC3602采用4mm×4mm QFN（或耐热增强型TSSOP-16）封装,在输出电压低至0．6V时能提供高达2．5A的连续输出电流。该器件用4．5～10V的输入电压工作,非常适用于两节锂离子电池应用以及通用的固定电压轨系统。     

美国国家半导体推出效率极高的大电流降压稳压器

<正>美国国家半导体公司(National Semiconductor Corp.)近日宣布推出两款业界效率最高的大电流同步降压稳压器,型号为LM21212-1和LM21215的芯片可为高性能现场可编程门阵列(FPGA)、特殊应用集成电路(ASIC)和微处理器提供稳压供电,适用于内置此类电路的低压系统,包括无线通信、网络和光纤通信等基础设施等。     

ADI公司推出具有内部补偿的高集成度降压型DC／DC同步稳压器

ADI公司推出集成式电源管理开关稳压器系列的最新成员ADP2118DC／DC开关稳压器。这款新型集成式3A、降压型DC／DC同步稳压器包含低导通电阻开关FET（场效应晶体管）,可最大限度地提高效率,并集成了内部回路补偿、电源良好指示器、精密使能、跟踪和同步功能,以简化负载点电源系统的设计。ADP2118设计用于支持从医疗设备到通信基础设施设备等多种应用中的高性能信号链负载,这些应用信号链可能包括ADC（模／数转换器）、DAC（数／模转换器）、精密放大器以及DSP（数字信号处理器）和FPGA（现场可编程门阵列）等其他高性能亚微米IC。     

凌力尔特推出具有55V瞬态保护的双通道降压型稳压器

凌力尔特公司（Linear Technology Corporation）推出双通道、电流模式降压型开关稳压器LT3641,该稳压器具有上电复位和看门狗定时器。其4～42V输入电压范围以及可承受55V瞬态的能力,使该器件非常适用于汽车应用中常见的负载突降和冷车发动情况,这类情况甚至在输入瞬态高达55V时也要求恒定输出调节。     

单片机控制的高性能单相交流稳压器设计

介绍由单片计算机控制的新型单相交流稳压器，阐述了系统工作原理，并对软、硬件设计作了讨论。     

高效率、降压式DC／DC变换器

功率MOSFET主要用途之一是用于电源。因为功率MOSFET作为开关管是十分理想：导通时导通电阻非常小，关断时漏电极小，并且可以工作于很高的频率。由DC／DC控制器及功率MOSFET组成的DC／DC变换器应用十分灵活。用功率MOSFET也可组成线性稳压电源，它具有极小的压差，可以说可做成超低压差线性稳压器。     

12V,3A电流模同步Buck DC-DC转换器功率级设计

采用0.35μm 18 V DPTM BCD工艺技术给出电流模降压型DC-DC转换器的功率级设计,该功率级可以输出3A负载电流,转换效率可达到94.5%。主要针对转换器中核心部分功率级进行设计,其中包括同步开关功率晶体管设计、片上电感电流检测电路、功率晶体管驱动电路设计以及功率级的版图设计考虑,最后给出了该功率级设计的测试结果 。     

一种降压型直流开关稳压电源的设计

为了解决传统DC-DC变换器存在的能量损耗大、效率低、输出纹波大等问题,以LM5117芯片和CSD 18532KCS MOS场效应管为核心器件,实现了16 V到5 V的直流电压降压转换。文中先通过对比各种降压型直流开关稳压电源的转换机理,确定了基于LM5117芯片的Buck变换器设计方案;接着详细阐述了电路设计中降压变换与稳压控制的方法,针对LM5117芯片外围关键的元件参数,给出了计算公式与参考数据,同时对于传统的电流采样与斜波补偿电路进行了改进;最后,经过实验验证,该设计的降压型直流开关电路负载调整率为3%,电压调整率为0.5%,效率达到87%,并且输出纹波得到较好的抑制,达到了预期设计的效果。     

Robust nonlinear adaptive control of multiphase synchronous buck power converters

The problem of controlling multiphase synchronous buck power converters is considered. The aims are to regulate the output voltage of the converter and to ensure adequate current sharing between its different channels. Using the backstepping technique, an adaptive controller is designed based on a large-signal bilinear model of the whole multi-channel converter. A parameter projection is used to ensure that the obtained adaptive controller is robust to parasitic resistances. The controller is formally shown to meet the objectives of closed-loop asymptotic stability, output reference tracking, and equal load sharing. The attraction region depends on the uncertain parasitic impedance size, with the attraction region being larger for smaller parasitic impedances. In the ideal case of no parasitic impedances, the closed-loop asymptotic stability is global. These theoretical results are confirmed by simulation.     

一种高效反激式开关电源的设计与性能测试

采用有源功率因数校正(APFC)芯片TDA4863及DC/DC变换器芯片NCP1207设计了一种实用反激式开关电源。样机实验结果表明,所设计开关电源的功率因数高于0.95,整个电源系统的效率>85.8%,且总谐波电流畸变率<3.75%,电磁污染程度较低,因而此电压具有较高的实用价值。     

基于ADP3181的交错并联同步BUCK电路的设计

介绍了美国模拟器件公司的专用于电压调节模块(VRM)的开关电源控制芯片ADP3181的主要特点,并设计了基于此芯片的三相交错并联同步整流BUCK电路,阐述了主电路和控制芯片外围电路的设计,给出了实验结果。     

Improving energy and power efficiency using NComputing and approaches for predicting reliability of complex computing systems

Opting to follow the computing-design philosophy that the best way to reduce power consumption and increase energy efficiency is to reduce waste, we propose an architecture with a very simple ready-implementation by using an NComputing device that can allow multi-users but only one computer is needed. This intuitively can save energy, space as well as cost. In this paper, we propose a simple and realistic NComputing architecture to study the energy and power-efficient consumption of desktop computer systems by using the NComputing device. We also propose new approaches to estimate the reliability of k-out-of-n systems based on the delta method. The k-out-of-n system consisting of n subsystems works if and only if at least k-of-the-n subsystems work. More specificly, we develop approaches to obtain the reliability estimation for the k-out-of-n systems which is composed of n independent and identically distributed subsystems where each subsystem (or energy-efficient usage application) can be assumed to follow a two-parameter exponential lifetime distribution function. The detailed derivations of reliability estimation of k-out-of-n systems based on the biased-corrected estimator, known as delta method, the uniformly minimum variance unbiased estimate (UMVUE) and maximum likelihood estimate (MLE) are discussed. An energy-management NComputing application is discussed to illustrate the reliability results in terms of the energy consumption usages of a computer system with quad-core, 8GB of RAM, and a GeForce 9800GX-2 graphics card to perform various complex applications. The estimated reliability values of systems based on the UMVUE and the delta method differ only slightly. Often the UMVUE of reliability for a complex system is a lot more difficult to obtain, if not impossible. The delta method seems to be a simple and better approach to obtain the reliability estimation of complex systems. The results of this study also show that, in practice, the NComputing architecture improves both energy cost saving and energy efficient living spaces.     

Design of a non-inverting synchronous buck-boost DC/DC power converter with moderate power level

This paper presents the design of a non-inverting synchronous buck-boost DC/DC power converter with moderate power level for a solar power management system. The buck-boost requirement arises from the rapid changes in the atmospheric condition or the sunlight incident angle. The system mainly consists of the non-inverting synchronous buck-boost DC/DC power converter, MOSFET drivers, anti-cross conduction logic circuitry, feedback compensator, and PWM regulator. The system is capable of converting the supply voltage source to higher and lower voltages to the load terminal with voltage polarity unchanged. The voltage at the load terminal is controlled by continuously adjusting the duty cycle of the PWM regulator. Application of the buck-boost converter in battery management system design is also addressed.     

一种高可靠性欠压脱扣器设计

针对电磁型欠压脱扣器可靠性较低、常见欠压脱扣器主电路设计方案较易损坏欠压脱扣器的问题,设计了一种基于电容降压的高可靠性欠压脱扣器,详细介绍了该脱扣器主电路、电压信号采样、频率跟踪、电源电路、放电电路的设计。实际应用表明,该脱扣器故障率不大于1‰,可靠性较高。     

高精度高可靠步进电机控制系统的设计及应用

介绍了一种高精度高可靠步进电机驱动控制系统的设计。该设计充分利用TMC260智能驱动芯片的优势,结合FPGA自由编程特点,设计了两相步进电机驱动电路。电路实现了电机在宽频内256细分的高精度步进,并具有电机过载检测、堵转报警等功能,作为血液分析仪的核心驱动部件在临床应用取得了很好的效果。     

一种实用动力电池用大功率电子开关设计

利用NMOS管设计了一种简单实用的24V、30A的动力电池用大功率电子开关。该开关主要应用于24V大功率电池电源管理系统的充、放电电路,设有常开触点、常闭触点各一个,具有充电防反接、放电防倒灌的功能,并设置了电源指示灯,可以直观地了解电路的工作状态。