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DIGITAL

  • 弗洛伊德 数字电子技术DIGITAL Fundamentals global edition

    弗洛伊德 (Thomas L.Floyd) (作者), 余璆 (译者)。《国外电子与通信教材系列:数字电子技术(第10版)》是一本关于数字电子技术的经典教材。最新版适应全球化。带来了新的一些改动,包括图画更丰富,引进了 Moore and Mealy 状态机等。

    标签: 数字电子技术

    上传时间: 2022-06-27

    上传用户:bluedrops

  • PMSM电机的无传感器磁场定向控制AN1078

    设计者根据对环境的需求,希望能不断开拓高级电机控制技术,用以制造节能空调、洗衣机和其他家用电器产品。到目前为止,较为完善的电机控制解决方案通常仅用作专门用途。然而,新一代数字信号控制器(DIGITAL Signal Controller,DSC)的出现使得性价比高的高级电机控制算法最终成为现实。例如,空调需要能够对温度作出快速响应以迅速改变电机的转速。因此,我们需要高级电机控制算法,以制造出更加节能的静音设备。在这种情况下,磁场定向控制(Field Oriented Control,FOC)脱顾而出,成为满足这些环境需求的主要方法。本应用笔记讨论了使用Microchip dsPIC0DSC系列对永磁同步电机(Permanent Magnet Synchronous Motors,PMSM)进行无传感器FOC的算法。为什么使用FOC算法?BLDC电机的传统控制方法是以一个六步的控制过程来驱动定子,而这种控制过程会使生成的转矩产生振荡。在六步控制过程中,给一对绕组通电直到转子达到下一位置,然后电机换相到下一步。霍尔传感器用于确定转子的位置,以采用电子方式给电机换相。高级的无传感器算法使用在定子绕组中产生的反电动势来确定转子位置。六步控制(也称为梯形控制)的动态响应并不适用于洗衣机,这是因为在洗涤过程中负载始终处于动态变化中,并随实际洗涤量和选定的洗涤模式不同而变化。而且,对于前开式洗衣机,当负载位于滚筒的顶部时,必须克服重力对电机负载作功。只有使用高级的算法如FOC才可处理这些动态负载变化。

    标签: pmsm 电机传感器 磁场 定向控制

    上传时间: 2022-06-29

    上传用户:shjgzh

  • SHT30温湿度传感器模块 I2C通讯 数字型 宽电压 传感器

    Datasheet SHT3x-DISHumidity and Temperature Sensor Fully calibrated, linearized, and temperaturecompensated DIGITAL output Wide supply voltage range, from 2.4 V to 5.5 V I2C Interface with communication speeds up to 1MHz and two user selectable addresses Typical accuracy of  2 %RH and  0.3 °C Very fast start-up and measurement time Tiny 8-Pin DFN package

    标签: sht30 温湿度传感器

    上传时间: 2022-06-29

    上传用户:

  • MICROCHIPAN1078PMSM电机FOC控制中文

    简介设计者根据对环境的需求,希望能不断开拓高级电机控制技术,用以制造节能空调、洗衣机和其他家用电器产品。到目前为止,较为完善的电机控制解决方案通常仅用作专门用途。然而,新一代数字信号控制器(DIGITAL Signal Controller,DSC)的出现使得性价比高的高级电机控制算法最终成为现实。例如,空调需要能够对温度作出快速响应以迅速改变电机的转速。因此,我们需要高级电机控制算法,以制造出更加节能的静音设备。在这种情况下,磁场定向控制(Field Oriented Control,FOC)脱颖而出,成为满足这些环境需求的主要方法。本应用笔记讨论了使用Microchip dsPIC2 DSC系列对永磁同步电机(Permanent Magnet Synchronous Motor,PMSM)进行无传感器FOC的算法。

    标签: 电机 foc

    上传时间: 2022-06-30

    上传用户:

  • 使用反电动势滤波进行无传感器BLDC控制

    简介本应用笔记说明了无传感器无刷直流(Brushless DC,BLDC)电机控制算法,该算法采用dsPIC数字信号控制器(DIGITAL signal controller,DSC)实现。该算法对电机每相的反电动势(back-Electromotive Force,back-EMF)进行数字滤波,并基于滤得的反电动势信号来决定何时对电机绕组换相。这种控制技术不需要使用离散式低通滤波硬件和片外比较器。BLDC电机的应用非常广泛。本应用笔记中描述的算法适合于电气RPM范围在40k到100k的BLDC电机。运行于此RPM范围内的一些BLDC电机应用可以是模式化RC电机、风扇、硬盘驱动、气泵以及牙钻等。本应用笔记中描述的算法可在以下两个Microchip开发板平台上实现:·PICDEMTA MCLV开发板·dsPICDEMTM MC1开发板PICDEMTM MC LV 开发板包括一片dsPIC30F3010DSC。上述算法在该器件上得以实现,因为该器件包含在PICDEMTM MCLV开发板中。然而,您也可使用dsPIC30F2010作为替代处理器以节约成本。该板的默认配置包含一个5MHz的晶振。在测试该算法时使用7.37MHz的晶振。PICDEM MCLV开发板上所使用的资源如下:

    标签: 电动势 传感器 bldc

    上传时间: 2022-06-30

    上传用户:

  • 用择多函数实现反电动势滤波的无传感器BLDC控制.

    本应用笔记介绍一种采用dsPIC数字信号控制器(DIGITAL Signal Controller,DSC)或PIC24单片机来实现无刷直流(Brushless Direct Current,BLDC)电机无传感器控制的算法。该算法利用对反电动势(Back-Electromotive Force,BEMF)进行数字滤波的择多函数来实现。通过对电机的每一相进行滤波来确定电机驱动电压换相的时刻。这一控制技术省却了分立的低通滤波硬件和片外比较器。需指出,这里论述的所有内容及应用软件,都是假定使用三相电机。该电机控制算法包括四个主要部分:·利用DSC或单片机的模数转换器(Analog-to-DIGITAL Converter,ADC)来采样梯形波BEMF信号·PWM导通侧ADC采样,以降低噪声并解决低电感问题·将梯形波BEMF信号与VBUS/2进行比较,以检测过零点·用择多函数滤波器对比较结果信号进行滤波·以三种不同模式对电机驱动电压进行换相:-传统开环控制器·传统闭环控制器比例-积分(Proportional-Integral,Pl)闭环控制器

    标签: BLDC

    上传时间: 2022-07-01

    上传用户:

  • 博通BCM43438KUBG正基同款AP6212sdio工业级wifi模块

    1. General Description BL-M3362NS1 product is designed base on Broadcom BCM43362 chipset. It operates at 2.4GHz band and supports IEEE802.11b/g/n 1T1Rwith wireless data rate up to 72.2Mbps. It supports IEEE802.11isafety protocol, along with IEEE802.11e standard service quality. It supports standard interfaces SDIOV2.0(50 MHz,4-bit and1-bit) and generic SPI(up to 50 MHz), Integrated ARM Cortex?-M3 CPUwith on-chip memory enables running IEEE802.11 firmware that can be field-upgraded with future features.2. The range of applying Imaging platforms(printers, DIGITAL still cameras, DIGITAL picture frames)Consumer electronic devices(DTV, DVDplayers, Blu-ray players. etc.)Gaming platforms Carinformation MiFi/Mobile Routes Smart PAD Set-TopBoxes

    标签: wifi

    上传时间: 2022-07-04

    上传用户:

  • 使用dsPIC30FDSC实现PMSM电机的正弦驱动

    简介本文档介绍了如何使用dsPIC30F数字信号控制器(DIGITAL Signal Controller,DSC)控制正弦电流来驱动具有位置传感器的永磁同步电机(Permanent Mag-net Synchronous Motor,PMSM).电机控制固件使用dsPIC30F外设,而数学运算则由DSP引擎完成。为充分利用dsPIC30F的特殊DSP运算性能,固件采用C语言编写,只有某些子程序采用汇编语言编写。应用特性·使用空间矢量调制(Space Vector Modulation,SVM)方法产生用于驱动PMSM电机各相的正弦电流·正弦电压与PMSM电机转子位置同步·四象限运行,可实现正向、反向和制动运行·基于数字比例一积分一微分(Proportional Integral Derivative,PID)控制的闭环转速控制·相位超前技术可实现更宽的调速范围·由dsPICODSC的DSP引擎实现小数数学运算

    标签: pmsm 电机

    上传时间: 2022-07-05

    上传用户:

  • 4G移动通信技术权威指南:LTE与LTE-Advanced.4G LTE.LTE

    PrefaceDuring the past years, there has been a quickly rising interest in radio access technologies for providingmobile as well as nomadic and fixed services for voice, video, and data. The difference indesign, implementation, and use between telecom and datacom technologies is also becoming moreblurred. One example is cellular technologies from the telecom world being used for broadband dataand wireless LAN from the datacom world being used for voice-over IP.Today, the most widespread radio access technology for mobile communication is DIGITAL cellular,with the number of users passing 5 billion by 2010, which is more than half of the world’s population.It has emerged from early deployments of an expensive voice service for a few car-borne users,to today’s widespread use of mobile-communication devices that provide a range of mobile servicesand often include camera, MP3 player, and PDA functions. With this widespread use and increasinginterest in mobile communication, a continuing evolution ahead is foreseen.This book describes LTE, developed in 3GPP (Third Generation Partnership Project) and providingtrue 4G broadband mobile access, starting from the first version in release 8 and through the continuingevolution to release 10, the latest version of LTE. Release 10, also known as LTE-Advanced,is of particular interest as it is the major technology approved by the ITU as fulfilling the IMTAdvancedrequirements. The description in this book is based on LTE release 10 and thus provides acomplete description of the LTE-Advanced radio access from the bottom up.Chapter 1 gives the background to LTE and its evolution, looking also at the different standardsbodies and organizations involved in the process of defining 4G. It also gives a discussion of the reasonsand driving forces behind the evolution.Chapters 2–6 provide a deeper insight into some of the technologies that are part of LTE and itsevolution. Because of its generic nature, these chapters can be used as a background not only for LTEas described in this book, but also for readers who want to understand the technology behind othersystems, such as WCDMA/HSPA, WiMAX, and CDMA2000.Chapters 7–17 constitute the main part of the book. As a start, an introductory technical overviewof LTE is given, where the most important technology components are introduced based onthe generic technologies described in previous chapters. The following chapters provide a detaileddescription of the protocol structure, the downlink and uplink transmission schemes, and the associatedmechanisms for scheduling, retransmission and interference handling. Broadcast operation andrelaying are also described. This is followed by a discussion of the spectrum flexibility and the associated

    标签: 4g 移动通信

    上传时间: 2022-07-08

    上传用户:

  • STM32F103的ADC转换源程序

    本压缩包上传的源程序使用C语言编写,可以进行二次开发,可移植性强!ADC(analog to DIGITAL converter)即模数转换器,它可以将模拟信号转换为数字信号。按照其转换原理主要分为逐次逼近型、双积分型、电压频率转换型三种。STM32F1 的 ADC 就是逐次逼近型的模拟数字转换器。STM32F103 系列一般都有 3 个 ADC,这些 ADC 可以独立使用,也可以使用双重/三重模式(提高采样率)。STM32F1 的 ADC 是 12 位逐次逼近型的模拟数字转换器。它具有多达 18 个复用通道,可测量来自 16 个外部源、2 个内部信号源。 这些通道的 A/D 转换可以单次、连续、扫描或间断模式执行。ADC 的结果可以左对齐或右对齐方式存储在 16 位数据寄存器中。ADC 具有模拟看门狗特性,允许应用程序检测输入电压是否超出用户定义的阀值上限或者下限。

    标签: stm32 adc转换 源程序

    上传时间: 2022-07-25

    上传用户:zhanglei193