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特种氩弧焊机电源的实现

特种氩弧焊机电源的实现

讨论了一种用于氩弧焊机的电源系统。该系统解决了现有焊接电源存在的引弧困难、电流控制精度低等问题;电源随工控机控制的给定焊接电流参数而变化,提高了设备的自动化程...

2009-05-06 标签:电源 1035

Autozero Noise Filtering Impro

Autozero Noise Filtering Impro

Abstract: This article shows a simple technique to reduce the output noise of an autozero, indirect current-feedback instrumentation amplifier. The MAX4209 instrumentation amplifier serves as design example. A similar art...

2009-05-06 标签:Filtering 342

High-Side Current-Sense Amplif

High-Side Current-Sense Amplif

Abstract: This circuit modifies a standard 32V high-side current monitor to measure load current (to 30mA) while accommodating any level of high voltage, subject to limitations in the external components. (The components shown allow measur...

2009-05-06 标签:Current-Se 531

Overcurrent Monitor Operates u

Overcurrent Monitor Operates u

Abstract: Using a current-sense amplifier, a high-side MOSFET driver, and a latching voltage monitor a circuit can be easily constructed that protects from overcurrent conditions and operates at voltages as high as 26V. W...

2009-05-06 标签:Overcurren 350

电流限制电路的降压稳压器-Current-Limit Cir

电流限制电路的降压稳压器-Current-Limit Cir

Abstract: This article demonstrates how to achieve current limit for the MAX1692 PWM step-down regulator by using a MAX4173H current-sense amplifier. Additional Information: Quick View Data Sheet for the MAX16...

2009-05-06 标签:电流稳压器 270

High-Accuracy Current-Sense Am

High-Accuracy Current-Sense Am

Abstract: Current sharing between DC/DC converter modules enables several modules to be paralleled. In recent years, tight tolerances for current sharing have made discrete current-sense circuit designs a formidable challenge. This applica...

2009-05-06 标签:Current-Se 501

高侧电流传感器输出周期-High-Side Current

高侧电流传感器输出周期-High-Side Current

Abstract: The MAX4374 high-side current sense amplifier with two internal comparators is used to produce a pulse-width output signal proportional to the current being sensed. This simple circuit eliminates the need for a discrete A/D conve...

2009-05-06 标签:传感器电流 378

Practical Data Acquisition usi

Practical Data Acquisition usi

Abstract: This application note describes the design of a PC-based, 14-bit data acquisition system. It takes a system approach, includes all the necessary building blocks: analog, digital, hardware, and software. It discusses each step, te...

2009-05-06 标签:Power 721

混合电路驱动器的类型和数量的LED-Circuit Driv

混合电路驱动器的类型和数量的LED-Circuit Driv

Portable systems often use LEDs of different colors-white for the display backlight, green for keypad illumination, red for power, etc., and in varying quantities of each. Typically the LEDs are driven by at least two power supplies, one f...

2009-05-06 标签:LED驱动器 523

新增高电压能力的MAX471/MAX472高侧电流检测放大器

新增高电压能力的MAX471/MAX472高侧电流检测放大器

Abstract: An avalanche diode and current source provide a floating power supply to allow high-side current sense amplifiers to work at up to 300V. The MAX471 and MAX472 are complete bi-directional high-side current sense ...

2009-05-06 标签:MAXMAX471 806

Optocoupler Extends High-Side

Optocoupler Extends High-Side

Optocouple...

2009-05-06 标签:Current 553

新的功率检测电流断路器

新的功率检测电流断路器

摘要:大多数情况下电路断路器是检测电流。例如,保险丝,当电路超过它的限值时, 它靠切断电流来保护电路。对于恒定DC或RMS电源电压...

2009-05-06 标签:电流断路器 483

精密监视负电源电流的电路

精密监视负电源电流的电路

摘要:该电流检测电路监视负电源,并提供一个正比于负载电流的正输出电压。 在一个高可靠系统中,电源电流监视通常是一项必备功能,因为电流过大会给系统造成...

2009-05-06 标签:电源电流 355

高可靠性系统中电流检测的实际考虑

高可靠性系统中电流检测的实际考虑

摘要:电流检测最简单的方法是依据欧姆定律:电阻两端的压降和流过电阻的电流成正比。本文讨论了基于电阻的电流检测在实际设计中的问题,列举了一些典型实例,如:电流保...

2009-05-06 标签:电流 195

用两个单向电流检测放大器组成一个双向电流检测放大器

用两个单向电流检测放大器组成一个双向电流检测放大器

摘要:许多电池电流监测应用中需要双向电流检测功能,以测量电池的充电和放电电流。本文介绍了怎样用两个单向电流检测放大器,比如MAX4172和MAX4173,组成一个双向电流检测放大...

2009-05-06 标签:放大器单向电流 1103

简单的、输出锁定的过流故障检测器,具有快速的响应时间

简单的、输出锁定的过流故障检测器,具有快速的响应时间

摘要:本文介绍了一个简单、具有快速响应时间的过流故障检测器,用于低压系统的电路保护。该方案与专用的热插拔控制器不同,专用的热插拔控制器跳出欠压状态后往往具有较...

2009-05-06 标签:检测器 388

带有输入串联电阻的电流检测放大器的性能

带有输入串联电阻的电流检测放大器的性能

摘要:本篇应用笔记阐述了高边电流检测放大器的性能特性。本文论述了在放大器的检测输入端如何使用串联电阻。该设计方法特别适用于需要对高压线路上检测电阻两端的小信号...

2009-05-06 标签:串联电阻 255

Extend Current-Sense Amplifier

Extend Current-Sense Amplifier

Abstract: Adding a charge pump provides ±5V supply rails to the operational amplifier internal to a high-side current-sense amplifier. This modification enables that amplifier to sense currents down to 0V common-mode inputs. The circuit c...

2009-05-06 标签:Current-Se 520

利用0至1V模拟乘法器实现电池供电系统的精确功率管理

利用0至1V模拟乘法器实现电池供电系统的精确功率管理

摘要:有些系统要求测量输出到负载的功率,这比通过传统的电流检测放大器简单测量电流更为重要。负载功率测量可以精确管理电池或交流适配器供电设备的功率。该应用笔记显...

2009-05-06 标签:乘法器 390

采用简单的稳压电路为高边电流监测器提供恒定电压

采用简单的稳压电路为高边电流监测器提供恒定电压

摘要:在典型的光电二极管电流监测应用中,电流监测器和雪崩光电二极管(APD)之间的压降随温度和电流而变化,由此改变了总增益。本应用笔记介绍了一种利用稳压电路保持电流检...

2009-05-06 标签:电路监测器 269

利用精密仪表放大器实现负压电流检测

利用精密仪表放大器实现负压电流检测

摘要:ISDN、电信等系统需要一个负压电流检测放大器。本应用笔记介绍了一种设计负压电流检测放大器的方法。这种方法非常灵活,经过简单修改即可用于不同的负压电流检测。本...

2009-05-06 标签:放大器 285

模拟乘法器提高高边电流检测的测量精度

模拟乘法器提高高边电流检测的测量精度

摘要:将模拟乘法器和高边电流检测放大器相结合,能够在笔记本电脑或其它便携仪器中实现电池充、放电电流的测量。本文讨论将模/数转换器(ADC)的基准电压加到模拟乘法器的一...

2009-05-06 标签:电流 230

半导体切换开关-Semiconductor Toggle S

半导体切换开关-Semiconductor Toggle S

Abstract: A low-power circuit formed with resistors, capacitors, a pushbutton switch, and two comparators serves as a toggle switch that directly drives loads up to 40mA, providing a known state following power up, battery insertion, or sy...

2009-05-06 标签:开关半导体 242

电路简单双打输入频率-Simple Circuit Doub

电路简单双打输入频率-Simple Circuit Doub

Abstract: A simple circuit consisting of a comparator and an exclusive-OR gate is sufficient to double the frequency of a reference signal. The versatile phase-locked loop (PLL) allows multiplication of a reference freque...

2009-05-06 标签:频率 262

Light Is On When Power Is Out

Light Is On When Power Is Out

Abstract: A loss of AC power during darkness (sensed by a photoresistor) turns on an array of battery-powered white LEDs. To conserve power, a timer turns off the LEDs after a particular period of time (for example, 10 minutes). ...

2009-05-06 标签:Power 482

阅读隔离数字国家的电力消耗-Read Isolated Di

阅读隔离数字国家的电力消耗-Read Isolated Di

Abstract: A simple circuit employs a small transformer and latched comparator to sense the state of a digital line without drawing power from the line. Electronic systems must often isolate their inputs or outputs from th...

2009-05-06 标签:电力 266

建立比较器的外部滞回电压

建立比较器的外部滞回电压

摘要:长期以来, 模拟比较器的使用一直处在它的“同伴”――运算放大器的阴影之中。设计人员发表了大量针对运算放大器的应用笔记, 而关于比较器的应用笔记较少。正是由于缺...

2009-05-06 标签:电压 259

微电路的正电源电流监视器-Micropower Circui

微电路的正电源电流监视器-Micropower Circui

Abstract: The following application note shows a circuit that converts the load current of a positive power supply into a ground referenced signal voltage using the ICL7612 operational amplifier. The inexpensive circuit o...

2009-05-06 标签:监视器 418

pFET线性稳压低压差-pFET Linear Regula

pFET线性稳压低压差-pFET Linear Regula

P-channel MOSFETs (pFETs), though more expensive than pnp transistors, are free of the dissipation loss associated with base drive in a pnp circuit. pFETs also have a lower saturation voltage at light loads (Figure 1). In fact, the low RDS...

2009-05-06 标签:pFET 540

升压转换器具有较高的轻负载效率-Boost Converte

升压转换器具有较高的轻负载效率-Boost Converte

In most DC-DC converters, the normal supply currents do not allow high efficiency at low load currents. The circuit in Figure 1, however, contains micropower components that enable it to maintain 90% efficiency for load currents as low as ...

2009-05-06 标签:转换器 392

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