智能功率模块调压调频高压电源应用

IPM(智能功率模块)目前有着非常大的应用及发展潜力,本文对由其构成的一种调压调频高压电源进行了分析,并对这种电源的应用及展望进行了总结与探讨,旨在为智能功率模块调压调频高压电源的研究及应用起到一定的指导作用。     

TM03无级调压调功模块的原理及应用

ＴＭ０３是一种多功能的无级调压调功模块，它既可工作于移相触发控制方式，也可工作于过零触发控制方式，它还具有闭环稳压功能，从而可使输出电压稳定在所调定的电压上。本文介绍了ＴＭ０３的内部结构和工作原理以及它的典型应用电路。     

智能功率模块在VVVF变频器中的应用

智能功率块内装驱动和保护电路,使产品设计更方便。ＶＶＶＦ变频器是一典型的应用实例。选用智能功率块时,要根据智能功率块过流动作电流来确定其峰值电流。在设计外围电路时,应设计相应的缓冲吸收电路,并根据需要设计规定的独立控制电源。     

负载可为纯感抗的可程控的调压触发模块ACRV01

本文介绍了调压触发模块ＡＣＲＶ０１的功能特点，给出了实际应用电路。它既可用电位器调节，又可由微机控制，并且为任意负载。     

IGBT-IPM智能模块的电路设计及在SVG装置中的应用

介绍了IGBT-IPM智能模块的基本情况和功能特点 ,并对该智能功率模块的相关电路设计方法和需要注意的问题进行了深入地分析 ,最后结合SVG装置 ,详细说明了该模块的应用 ,并给出了系统硬件结构图     

PLC在温度控制系统中的应用

介绍了可编程序控制器S7—200对电阻炉温度调节的应用，阐述了PID参数的调整在PLC控制器中PID参数的设定方法．     

基于FPGA+VHDL的温度控制系统设计

温度检测和控制系统在实际中有着广泛的应用,如温室的温度控制等.本文介绍了一种基于FPGA VHDL的温度控制系统设计.可编程器件(CPLD/FPGA)和硬件描述语言VHDL的出现使得数字电路的设计周期缩短、难度减小.系统采用FPGA作为核心控制器件和VHDL进行编程,设计采用模块化思路:分别实现各个模块(包括温度检测、键盘输入、温度显示和控制),再加以整合实现整个系统,达到了温度控制的目的.     

EU-V-Ⅲ型数字调压模块在赋能电源中的应用

主要介绍EU-V-Ⅲ型数字式纯正弦波调压模块的基本工作原理，介绍它在一种特种电源——赋能电源中的应用。     

智能功率模块及其在功率变换器中的应用

概述了新型器件智能功率模块ＩＧＢＴ－ＩＰＭ的固有功能,介绍了该芯片在我们开发的大功率直流ＰＷＭ调压器及交流电机变频调速等实用系统中的使用方法与技巧。     

A novel current-sharing control technique for low-voltagehigh-current voltage regulator module applications

Future generations of microprocessors are expected to exhibit much heavier loads and much faster transient slew rates. Today's voltage regulator module (VRM) will need a large amount of extra decoupling and output filter capacitors to meet future requirements, which will basically make the existing VRM topologies impractical. As a candidate topology, the interleaved quasisquare-wave (QSW) VRM exhibits very good performance, such as a fast transient response and a very high power density. The difficulty with the application of the interleaved parallel technology is the current-sharing control. In this paper, a novel current-sensing and current-sharing technique is proposed. With this technique, current sharing can be controlled simply in parallel converters without a current transformer and current-sensing resistors. In addition, this technique can be easily integrated with an IC chip. The four-module paralleled QSW VRM is used to evaluate this technique. Experimental results verify that with this technique, the VRM has a high power density, high efficiency and a fast transient response. The concept of the current sharing technique is also generalized and extended     

Integrated voltage regulator SPICE model

An integrated voltage regulator SPICE model is presented. The model takes into account the main electrical characteristics (dropout voltage and quiescent current); the thermal effects of the electrical variables; and one of the electrical effects of the junction temperature, the thermal shutdown, a protection system used by many commercial devices     

三端集成稳压器及应用

三端集成稳压器因其成本低、体积小、简便可靠、稳压效果好等优点获得了广泛应用。本文首先对三端集成稳压器的结构特点作了简要介绍,然后从引脚名称、外形与框图、输出电压系列等到若干方面对固定式与可调式三端集成稳压器进行了详细地对比,最后对由其构成的常见直流稳压电路进行了深入浅出的讨论。主要介绍了变压器、整流二极管的选取,正负稳压电源及从0V起调的可调直流稳压电源的构成原理,对常见直流稳压电源的设计起抛砖引玉的作用。     

MAX1169及其在温差控制系统中的应用

介绍了兼容PC串行接口的16位逐次逼近型A/D转换器MAX1169的特点和引脚功能;给出了MAX1169在温差控制系统中的应用实例,并提供了相应的硬件电路及其C51源程序.MAX1169具有接口电路简单,分辨率高,功耗低等特点.可广泛应用于各种数据采集系统中.     

电池电压检测器及其应用

MIC2755是MICREL公司2000年2月份推出的新器件,是一种新型电池电压检测器芯片。它设计用来监控便携数字系统的电池,如用于个人数字助理(PDA)、寻呼机、便携式电子仪器、嵌入式控制器及消费类电子设备等。该器件能检测电池或电池组三种不同状态:电池电压良好、电池低电压及电池失效;并将有关信号输入电源(线性稳压器或DC/DC变换器)或微控制器(μC)或微处理器(μP),以防止电池电压不正常而影响整个系统工作或电池过放电而损害电池寿命。     

Integrated process capability analysis with an application in backlight module

Backlight application specializes in supplying light, with notable examples including liquid crystal display (LCD), hand-phone LCD, and PDA LCD. The integrated process capability and integrated process yield for cold cathode fluorescent lamp backlight are unknown. Process capability analysis is a highly effective means of assessing the process ability of backlight that meets specifications. A larger process capability index (PCI) implies a higher process yield, and lower expected process loss. Chen et al. [Int. J. Product. Res. 39 (2001) 4077], applied indices C_pu, C_pl, and C_pk to evaluate the integrated process capability for a multi-process product with smaller-the-better, larger-the-better, and nominal-the-best specifications, respectively. However, C_pk suffers from the weakness of being unable to reflect the specific process yield. This study selects index C_ps to replace C_pk. Meanwhile, an integrated PCI for the entire backlight module is proposed, and the relationship between the PCI and process yield is described. A multi-process capability analysis chart, which reasonably accurately indicates the status of process capability for the backlight module, is designed for practical applications.     

Characterization and performance comparison of ripple-based control for voltage regulator modules

Three recently developed control methods for voltage regulator modules, namely, V/sup 2/ control, enhanced V/sup 2/ control, and enhanced V/sup 2/ control without output voltage dynamic feedback, are analyzed and compared in this paper. All three methods utilize the output voltage switching ripple for pulse-width modulation (PWM), hence, are collectively referred to as ripple-based control. A general modeling method based on the Krylov-Bogoliubov-Mitropolsky ripple estimation technique is applied to develop averaged models for single-channel as well as multichannel buck converters employing each of the control methods. Unlike existing models that are limited to small-signal operation, the proposed models are valid for large-signal operation and are capable of predicting subharmonic instability without including any sample-and-hold block as used in previous models. The paper also shows that adding parallel, high-quality ceramic capacitors at the output, which are ignored in previous models, can lead to pulse skipping and ripple instability, and a solution based on proper selection of the ceramic capacitors and/or ramp compensation at the PWM is presented. The models are further applied to analyze and compare the performance of the three control methods in terms of ripple stability, effective load current feedforward gain, and output impedance.     

基亏ARM的数字调压控制系统设计与实现

随着电子信息技术和半导体技术的深入发展,嵌入式系统的应用日趋广泛,在控制领域之中更多的使用了高性能微处理器．以满足各方面越来越多的控制应用需求。基于ARM嵌入式平台的数字调压控制系统,克服了传统上以旋钮或滑变式变阻器对交流电压进行模拟控制的弊端。本系统以嵌入式技术为基础,在嵌入式平台上利用ARM微处理器实时控制数模信号的转换．以控制正弦波调压模块对交流电压的大小调节。本文中通过对本系统的实际测试,验证了数字调压控制系统的功能特性．并且定量测试得出了本系统可以实现对交流电压进行线性调节的结论。数字调压控制系统可作为对电压的智能调节装置应用于家庭、医疗及工业自动化等领域,并且具有调节精度高、调节线性度好．易于操作等特性。     

Stability and dynamic performance of current-sharing control forparalleled voltage regulator modules

The parallel operation of voltage regulator modules (VRMs) for high-end microprocessors requires a current-sharing (CS) circuit to provide a uniform load distribution among the modules. A good dynamic performance of the CS circuit is very important since the microprocessors present highly dynamic loads to the VRMs. Stability and dynamic performance of the CS control are considered. To assess these issues, a comprehensive small-signal model of the paralleled VRMs was developed and verified     

基于IGBT模块饱和压降温度特性的结温探测研究

实验室条件下,IGBT模块的结温探测是瞬态热阻抗测试的关键。首先分别在热稳态和热瞬态下证明了饱和压降温度特性只与芯片有关,然后建立了IGBT模块结温探测模型,利用饱和压降值和集电极电流值来计算结温值,并将用模型计算出的结温与光纤实测的结温相比较,吻合性良好,证明了模型计算法能够准确探测结温。该方法可以用于恒流加热过程中瞬态热阻抗的测量,比起热敏参数法中冷却过程测量瞬态热阻抗相比,更具有实际意义。