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
飛機電網故障時,機載電氣盒必須在延遲時間內切斷電網,保護機載設備。采用AT89S52設計的電氣盒測試儀能夠測試電氣盒保護功能,測量延遲時間。實際應用結果表明,該測試儀具有測量準確、可靠性高、成本低等優點。 Abstract: The helicopter-electrical-box must shut off the helicopter power,protect the equipments of the helicopter when the helicopter power is failed.The tester for the helicopter-electrical-box based on AT89S52is used for testing the protect-ing function and measuring the delay time.Application results show this tester has some advantages,such as accurate mea-surement,high dependability,economical cost etc.
上傳時間: 2014-12-27
上傳用戶:786334970
詳細介紹了PCI9052接口器件的功能、結構和使用方法,并結合實際給出了基于PCI9052器件開發PCI總線接口卡的應用實例。 Abstract: The main functions,structures and usage of PCI9052inferface chip are introduced in detail in this paper.And an application example of designing PCI bus interface card based on PCI9052is proposed in this paper.
上傳時間: 2013-10-16
上傳用戶:togetsomething
介紹基于ISA總線與KH-9300的數據采集板卡的設置,詳細說明8254定時計數器及8259中斷控制器的結構特點、工作方式、控制字等,探討中斷類型、中斷處理程序、中斷矢量表及其填寫。重點講述使用TorboC編寫中斷服務程序的方法,應注意的主要問題及程序測試的結果。 Abstract: The settings of KH-9300 data acquisition board based on the ISA bus is introduced,the structural characteristics,working methods,control characters of the timing counter 8254 and interruptioncontroller 8259 are explained in detail.The interruption type,interrupt handling programs,interruption vector table and its filling also are discussed.Further,great emphasis is put on the method of interrupt service program compiled by Torbo C,the main issues that should be noted,and the results of program testing.
上傳時間: 2013-11-14
上傳用戶:qq527891923
數字信號處理器dsPIC33F集多通道高精度A/D轉換、多通訊模式、看門狗、CMOS Flash技術等于一體,其內部可完成所有數據操作,實現總線不出芯片技術。將該處理器應用于微機保護裝置,提出基于dsPIC33F微處理器的微機保護裝置的設計方案,給出相應的接口電路與軟件流程。該設計方案結構簡單,性價比及可靠性高,開發周期短,具有一定的實用推廣價值。所研制的微機保護裝置現場運行效果良好。 Abstract: The dsPIC33F microprocessor has a plentiful interior resource which contains multi-channel,high precision A/D converters,multi-communication module,watchdog,CMOS Flash technology,and so on.All data manipulations is accomplished interiorly.What is more,it makes the technology that bus does not go beyond the chip comes into practice.The paper put forwards a design scheme based on dsPIC33F microprocessor.The scheme has the advantages of simple structure,high reliability and shortened exploitation cycle.What is more,it has definite practicality and reference.The microcomputer protection device has been put into operation with excellent effects.
上傳時間: 2013-11-16
上傳用戶:開懷常笑
介紹了以AVR單片機ATmega16為核心,采用前端信號調理電路、程控增益放大器以及波形顯示LCD(GDM12864A)實現的一個簡易示波器。并給出該系統設計的硬件和軟件設計方案。 Abstract: Abstract:This paper introduces an easy digital storage oscilloscope based on the AVR microcontroller ATmega16,especially emphasizes on the software design and the hardware design which contains signal processing circuit,gain-programmed amplifier circuit and LCD’s interface circuit and so on.
上傳時間: 2013-10-13
上傳用戶:ccccccc
提出一種基于C8051F040的炮塔方位角測試系統的設計方案,給出測試系統的各個模塊軟硬件設計。炮塔方位角測試系統集數據采集,數據傳輸和數據顯示等功能于一體,實現了炮塔方位角裝置的離線檢測。系統軟件采用C51編寫,對單片機進行有效電源管理,保證了系統的穩定性,可靠性。 Abstract: This paper puts forwards a design of artillery position system based on C8051F040,describes all modules hardware and software design of measurement system.The system has the function of information collection,transmission,and display.It can measure artillery position system in offline.The system software using C51can manage the power of single chip microcomputer,guarantee the stability,reliability.
上傳時間: 2014-12-27
上傳用戶:7891
介紹基于VHDL的微型打印機控制器的設計。論述了微型打印機的基本原理,以及實現控制器的VHDL語言設計。打印機的數據來自系統中的存儲模塊,根據需要控制打印。該微型打印機控制器可取代傳統的微型打印機,且抗干擾性好,可靠性高,具有較強的移植性,稍加改動就可應用于不同場合。 Abstract: This paper introduced the design method of micro printer controller based on VHDL.The basic principles of microprinter is explained,as well as the realization of the controller by VHDL language.The printer data is from the system memory modules,can control printer.The design of microprinter controller has antigood and high reliability,it can replace the traditional printer.The controller has very good portability,and need little modify that can use in different situation.
上傳時間: 2013-11-03
上傳用戶:dudu1210004
介紹一種基于C8051F060單片機和NAND Flash的數據采集存儲系統,該系統可實現3路信號采樣,每路采樣率為5KS/s,通過異步串行通信接口實現數據傳輸。并詳細說明系統的軟件設計。 Abstract: An acquisition and storage system based on C8051F060and NAND Flash is designed in this paper.The system is used to sample three-channel of signal,5KSPS each channel,and can upload data to test bench through UART(Universal Asynchronous Receiver/Transmitter).The software design is discussed in detail.
上傳時間: 2013-10-12
上傳用戶:Jesse_嘉偉
介紹了采用ATmega48單片機實現三相無刷直流電機控制器的方法。利用Atmega48獲得帶死區的脈寬調制(PWM)、霍爾傳感器的換相處理、正弦驅動信號的產生和電機轉速的控制等功能。采用該方法的優點是所需的外圍器件少,成本低。 Abstract: The method of 3-phase brushless DC motor control based on ATmega48 is presented in this paper.The system uses ATmega48 to generate PWM signals with dead-time, hall sensors signals commutation,sine driving signal and rotational speed of motor.Using this method,the needed external devices are few, the cost is low.
上傳時間: 2013-12-09
上傳用戶:330402686