數字控制的交流調速系統所選用的微處理器、功率器件及產生PWM波的方法是影響交流調速系統性能好壞的直接因素。在介紹了正弦脈寬調制(SPWM)技術的基礎上,設計了一種以8098單片機作為控制器,以智能功率模塊IPM為開關器件的變頻調速系統。通過軟件編程,產生正弦脈沖寬度調制波形來控制絕緣柵雙極晶體管的導通和關斷,從而達到控制異步電動機轉速的目的。實驗結果表明,該系統可調頻率調電壓,穩定度高,調速范圍寬,具有較強的實用價值 Abstract: AC variable speed with digital control systems used microprocessors, power devices and generate PWM wave is the direct factors of affecting the performance AC speed regulation system. On the basis of introducing the sinusoidal pulse width modulation (SPWM) technology,this paper designed variable speed system which used 8098 as a controller, intelligent power module IPM as switching device. Through software programming, resulting in sinusoidal pulse width modulation waveform to control the insulated gate bipolar transistor turn on and off, so as to achieve the purpose of speed control of induction motors. Experimental results show that the system can adjust frequency modulation voltage, high stability, wide speed range, has a strong practical value.
上傳時間: 2013-11-14
上傳用戶:ynwbosss
以太網和CAN總線應用廣泛,但由于其通信協議不同,兩種總線器件間無法進行數據通信,因此,設計了基于CP2200與C8051F040的以太網總線與CAN總線接口轉換電路,并給出部分相關硬件電路與軟件設計分析。在保證數據完整和協議可靠的前提下,通過握手協議和簡化的以太網協議,不僅實現了以太網數據與CAN數據的轉發,同時還順利的解決了以太網的高速性與CAN的低速率沖突,以及兩者數據包之間的大小不同的矛盾。 Abstract: In the development of actual application, Ethernet and CAN bus are used very extensively. Owing to its various communication protocols, the communicating between two kinds of bus device can’t be carried out. Therefore, in order to solve this problem, the Ethernet-CAN bus interface circuit based on CP2200 and C8051F040 was designed in this paper, and part of the related hardware circuit and software design analysis were given. On the condition of data’s integrity and protocols’reliability, through the handshaking protocols and the simplified the Ethernet protocol, not only the data switching between CAN and Ethernet was realized, but also the differ in velocity and packet size was solved.
上傳時間: 2013-10-15
上傳用戶:Ants
介紹一種基于CAN總線的牽引變電站自動化系統通訊規約的設計,CAN通訊規約采用標準幀,報文采用主動發送和發送查詢兩種處理形式。該設計在城市輕軌與地鐵牽引變電站中的應用表明:可實現間隔層和通訊處理層的數據快速、可靠的交換,提高牽引變電站的安全性和穩定性 。 Abstract: This paper firstly presents a kind of design dealing with communicational protocol to the traction substation automation system based on CAN bus,and then comes up with the ideas that all frames of CAN communicational protocol should adopt the standard frame,and that messages be processed by two ways:sending initiatively and sending quiries.Subway and light rail application shows that the use of the CAN bus is possible to exchange data quickly and reliably between the layers of the middle and the communicational processing,hence to improve the safety and stability of traction substations.
上傳時間: 2013-11-07
上傳用戶:bs2005
介紹一種無極可調交流電子負載設計的新方法,由ATmega48單片機輸出PWM波,通過上位機設定不同的占空比控制場效應管的通斷時間,即改變流過場效應管的平均電流。根據電流的大小,可以等效為相應的負載,并將采集的電流值顯示在上位機上。文中對該系統的軟﹑硬件設計思路作了詳細的分析,闡述了其設計原理。 Abstract: A new type electronic load is introduced.Due to ATmega48 microcomputer output PWM wave.The different duty is set ratio through PC to control FET turn-on time.We can equivalent homologous load according the current and display the current at PC.The hardware and software designing are analysed in detail. The principle is explained and the output is also given.
上傳時間: 2013-11-23
上傳用戶:蟲蟲蟲蟲蟲蟲
對于瀝青混凝土攤鋪機自動找平控制系統來說,數字式控制系統的研制是目前的一個方向。介紹了一種基于CAN總線的數字式自動找平控制系統。該系統以CAN總線作為通信方式,PWM控制信號通過C8051F040單片機內部PCA可編程計數器陣列產生,并具有結構簡單、信號穩定、實時性強、易擴展的特點。通過硬件實現和系統運行達到了比較理想的控制效果,驗證了系統的可行性。 Abstract: A digital auto-leveling control system based on CAN Bus is introduced.It uses CAN Bus as the method of communication and creates PWM signals by programmable counter array in C8051F040 microcontroller. The system is simple, stable, real-time and expansive.
上傳時間: 2013-10-09
上傳用戶:ligi201200
摘要:“網絡通”是基于普通單片機的廉價以太網測控網關。它可以將具有RS-232、RS-485等接口的測控設備簡單而且直接地連接在以太網(因特網)上,利用豐富的現成的以太網資源,組成一系列以太網的分布式測控系統。關鍵詞:以太網分布式測控系統 以太網測控網關 網關 網絡通
上傳時間: 2014-12-27
上傳用戶:xg262122
議程1.瑞薩汽車業務概述2.儀表盤MCU解決方案3.CAN/LIN(車身)MCU解決方案
上傳時間: 2013-10-20
上傳用戶:王成林。
選擇了芯片后,就可以圍繞該芯片確定相應的開發工具。開發工具的好壞往往是決定一個系統成敗的關鍵,下面是對CAN-BUS開發系統組成的一些建議:
上傳時間: 2013-11-02
上傳用戶:yueguizhilin
采用Infineon XC2000系列單片機實現CAN網關模塊,利用MFC編寫PC端網關配置軟件。該系列單片機MultiCAN模塊可實現不同速率的獨立CAN網絡之間的數據接收、存儲、轉發;能夠過濾不需要的CAN消息,降低子網的負荷。該網關模塊可以實現改變CAN網絡拓撲結構、延長網絡通信距離、增加節點數目等功能。
上傳時間: 2014-12-27
上傳用戶:風為裳的風
一、版權信息PCI-51XX系列智能CAN接口卡及相關軟件均屬廣州市周立功單片機發展有限公司所有,其產權受國家法律絕對保護,未經本公司授權,其他公司、單位、代理商及個人不得非法使用和拷貝,否則將受到國家法律的嚴厲制裁。您若需要我公司產品及相關信息,請及時與我們聯系,我們將熱情接待。廣州周立功單片機發展有限公司保留在任何時候修訂本用戶手冊且不需通知的權利。 二、功能特點PCI-51XX智能CAN接口卡是具有PCI接口的高性能CAN總線通訊適配卡,它使PC機方便地連接到CAN總線上,實現CAN2.0B協議的數據通訊。PCI-51XX智能CAN接口卡采用標準PCI接口,實現與主機PC的高速數據交換。接口卡上自帶光電隔離模塊,使PC機避免由于地環流的損壞,增強系統在惡劣環境中使用的可靠性。PCI-51XX智能CAN接口卡配有可在Win98/Me、Win2000/XP下工作的驅動程序,使用通用CAN接口庫,使開發簡單化,并包含在VC++、C++Builder、Delphi、VB下開發的詳細應用例程。
上傳時間: 2013-10-08
上傳用戶:wangyi39