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基于DSP的三相SPWM变频电源的设计

基于DSP的三相SPWM变频电源的设计

基于DSP的三相SPWM变频电源的设计 变频电源作为电源系统的重要组成部分,其性能的优劣直接关系到整个系统的安全和可靠性指标。现代变频电源以低功耗、高效率、电...

2009-04-24 标签:SPWM 680

采用混合SET/MOSFET 的比较器的设计

采用混合SET/MOSFET 的比较器的设计

  据2001 年的国际半导体技术未来发展预示,到2016 年MOSFETs 的物理沟道长度将达到低于10nm 的尺寸[1],而这种尺寸条件会影响到MOSFETs 的基本工作原理,因此必须寻找新的替代器...

2009-04-24 标签:比较器 234

采用PWM AC/AC变换的电压补偿器设计方案

采用PWM AC/AC变换的电压补偿器设计方案

  本文介绍配电系统中针对重要用户的一种新型电压补偿器,即在用户自耦变压器中加装PWM AC—AC变换器,通过换流技术来驱动AC—AC变换器。当扰动发生使得电压降低时,本装...

2009-04-24 标签:补偿器 495

采用PIC单片机芯片的三相半控整流电路设计

采用PIC单片机芯片的三相半控整流电路设计

   三相半控整流桥电路结构是一种常见的整流电路,其容易控制,成本较低。本文中介绍了一种基于 PIC690单片机与专用集成触发芯片TC787的三相半控整流电路,它结合专用集成...

2009-04-24 标签:整流 566

DVS与AVS的原理及设计应用

DVS与AVS的原理及设计应用

      在电池供电的嵌入式系统中,或采用高效率的电源管理芯片,或采用大容量的电池以解决能耗问题。但这两种办法已无法满足快速增长的芯片动态功耗和静...

2009-04-24 标签:DVS 250

A Comparison between Battery B

A Comparison between Battery B

Abstract: Dallas Semiconductor nonvolatile (NV) SRAMs are backed up with an internal battery. Some other NV memories on the market, such as NOVRAMs, back up the data with internal EEPROM. This application note discusses the difference...

2009-04-24 标签: 242

Battery Monitoring in NV SRAM

Battery Monitoring in NV SRAM

Abstract: As a prerequisite to this article, it is recommended that Application Note 505 be reviewed to gain a better understanding of the general behavior of lithium coin-cell batteries.Dallas Semiconductor offers a variety of pro...

2009-04-24 标签:SRAMNV 346

利用MAXQ3210产生压电信号

利用MAXQ3210产生压电信号

摘要:MAXQ3210微控制器集成了一个压电扬声器驱动器,以固定频率驱动高音扬声器。本应用笔记演示了怎样改动扬声器驱动器反馈单元,利用软件来产生各种频率信号。 ...

2009-04-23 标签:信号MAXQ32 212

笔记本电池工作原理

笔记本电池工作原理

笔记本电池工作原理 ??一般笔记本电电池电芯使用的是10.8V或11.1V,而单个电池无法满足要求因此笔记本电脑电池都是采用多个单体电池串联和并联组成的电池组。至于大家...

2009-04-23 标签:笔记本 1228

电源管理与使用的高速微控制器-Using Power Man

电源管理与使用的高速微控制器-Using Power Man

Abstract: Power consumption in battery-backed systems employing microcontrollers is discussed in this application note. Most Dallas Semiconductor high-speed microcontrollers, including the DS87C520, DS89C450, DS80C400 and DS5250 utilize va...

2009-04-23 标签:微控制器电源管理 804

逻辑电平转换

逻辑电平转换

摘要:逻辑电平转换技术及其缺陷—Maxim的解决方案。 对逻辑电平转换的需求越来越多的数字IC采用与以往不兼容的电源电压、更低的VDD、或者VCORE和VI/O不同的...

2009-04-23 标签:转换电平 1814

电阻电桥基础

电阻电桥基础

摘要:电桥是用来精密测量电阻或其他模拟量的一种非常有效的方法。本文继第一部分之后,介绍了如何实现具有较大信号输出的硅应变计与模数转换器(ADC)的接口。特别是Σ-Δ ADC,...

2009-04-23 标签:电阻电桥 983

凌力尔特公司推出4通道12位/10位/8位DAC LTC26

凌力尔特公司 (Linear Technology Corporation) 推出 4 通道 12 位、10 位和 8 位轨至轨数模转换器 (DAC) LTC2634,该器件在 3mm x 3mm QFN 和 MSOP 封装中集成了一个精确的基准。LTC2634 是凌力尔特公司...

2009-04-23 标签:凌力尔特 240

DC/DC辐照损伤与VDMOS器件噪声相关性研究

DC/DC辐照损伤与VDMOS器件噪声相关性研究

  大量的研究表明,低频噪声除了与产品性能有关之外,还与产品质量和可靠性密切相关。国内外出现了一系列使用低频噪声特别是1/f噪声表征器件可靠性的方法,这些器件不...

2009-04-23 标签:DC/DC 229

上网本电源管理系统的设计挑战

     上网本的电源管理系统可分为以下几部分:1. 电池充电和管理;2. CPU 处理器供电;3.系统5V/3.3V供电;4. I/O和显卡供电;5. 显示背光供电;6. DDR存储器供电。 &nb...

2009-04-23 标签:电源管理 304

Maxim为什么选择设计单片NV SRAM模块

摘要:为了理解Maxim的单芯片模块设计原则,首先需要知道电池备份存储器的开发历史。 开发NV SRAM的目的是生产一种类似于IC的混合存储器产品,利用低功耗SRAM配合锂...

2009-04-23 标签:模块SRAM 297

Battery-Switchover Circuit Acc

Battery-Switchover Circuit Acc

Abstract: Portable systems often require operation from batteries or from a wall adapter. The MAX8865 low-dropout (LDO) linear regulator is used to provide the switchover function while supplying a regulator 2.84V that can deliver 100mA. ...

2009-04-23 标签: 490

大型电容器替代备用电池-Large Capacitor Re

大型电容器替代备用电池-Large Capacitor Re

Abstract: Use a supercap to reduce cost of simple battery backup circuits. In low-power systems that require a battery backup switchover circuit during brownout conditions, a supercap may provide adequate power to maintain memory operation...

2009-04-23 标签:电容器 396

PC Chipset Power Fail and Rese

PC Chipset Power Fail and Rese

Abstract: The following application note discusses the advantages of using the DS1632 PC Power Fail and Reset Controller to consolidate various power management functions into one device vs. using discreet components. The DS1632 performs c...

2009-04-23 标签:Chipset 738

在断电时如何保存数据-How to Save Data Du

在断电时如何保存数据-How to Save Data Du

Abstract: The following application note discusses how the DS1233 can be used to save data during a power failure without corrupting the NV SRAM. For many memory systems requiring nonvolatile memory, Dallas Semiconductor ...

2009-04-23 标签:数据 575

微电路具有自动关机和低电池锁定功能-Micropower C

微电路具有自动关机和低电池锁定功能-Micropower C

Abstract: The following application note provides a circuit that automatically performs shutdown, power-up, and low-battery lockout functions without the need for software control. This micropower circuit provides shutdow...

2009-04-23 标签:微电路 295

Switching Between Battery and

Switching Between Battery and

Abstract: The following application note discusses a circuit that switches power sources efficiently without switching noise using the MAX6326. It discusses the advantages of using this technique over a simple diode-ord method. ...

2009-04-23 标签:BatteryPo 409

最大限度地延长电池寿命,减少更换-Maximize Batt

最大限度地延长电池寿命,减少更换-Maximize Batt

Abstract: The MAX6326 microprocessor supervisor is used in an application to provide a battery switchover circuit when the wall adapter is disconnected. The reset output drives an external MOSFET that is used as a switch. This switchover c...

2009-04-23 标签: 236

低成本供应交流-Low-Cost AC Supply

低成本供应交流-Low-Cost AC Supply

Abstract: The following application note discusses a low-cost solution to implement a 3V, 3.3V or 5V logic supply from AC power. It uses the MAX6330 shunt regulator which can supply up to 50mA as well as offering a reset output (power-on r...

2009-04-23 标签:电源 206

Battery Monitoring in NV SRAM

Battery Monitoring in NV SRAM

Abstract: As a prerequisite to this article, it is recommended that Application Note 505 be reviewed to gain a better understanding of the general behavior of lithium coin-cell batteries.Dallas Semiconductor offers a variety of pro...

2009-04-23 标签:Battery 549

上电复位与相关监控功能

上电复位与相关监控功能

摘要:本文讨论用于单电源或双电源处理器的上电复位功能和门限电压的选择策略,另外,还探讨了手动复位、电源失效和低电压检测等功能。文中阐述了避免使用分立POR和处理器...

2009-04-23 标签:复位 339

高可靠系统的电源电压监控和排序

高可靠系统的电源电压监控和排序

摘要:该应用笔记说明高可靠系统中合理监控电源电压和电源排序的必要性,给出了监控器的选择标准,并说明上电复位(POR)电路、多电压监控和余量功能的必要性。另外,还讨论了...

2009-04-23 标签:监控排序 482

过压保护的备用电路: 技巧和窍门

过压保护的备用电路: 技巧和窍门

摘要:过压保护(OVP)器件用于保护后续电路免受甩负载或瞬间高压的破坏,在某些特定的应用中,基本的过压保护电路不足以胜任器件保护的要求,通常有以下两种需求。第一,电路...

2009-04-23 标签:备用电路 211

Boost Converter Yields Orderly

Boost Converter Yields Orderly

Some microprocessor (µP) systems require more time for shutdown than is provided by conventional circuits for power-fail detection. Between first warning and the actual loss of power, such systems have extensive "housekeeping" tasks ...

2009-04-23 标签:Converter 561

监集成电路监控电池供电设备-Supervisor ICs M

监集成电路监控电池供电设备-Supervisor ICs M

Abstract: To ensure correct operation, most microprocessor-based systems require supervision during power-up and power-down, and when entering or exiting shutdown or sleep mode. The supervisor may only provide a power-on reset, or it may o...

2009-04-23 标签:集成电路 348

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