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switchING

  • SKS-100 Single Output Switchin

    Features:   High efficiency, high reliability, low cost  AC input range selected by switch  100% full load burn-in test  Protections: Short circuit / Over load  Fixed switchING frequency at 25KHz  Cooling by free air convection  1 year warranty   Dimensions: 199*98*38mm (L*W*H)    

    標(biāo)簽: Switchin Output Single SKS

    上傳時(shí)間: 2013-10-30

    上傳用戶:taa123456

  • 電源濾波器POWER LINE FILTERS

    應(yīng)用 APPLICATIONS·電視機(jī)、錄像機(jī)、音頻設(shè)備、顯示器、復(fù)印機(jī)、打印裝置、游戲機(jī)及計(jì)算機(jī)等。·用于開關(guān)電源線性濾波器。·削除 TV、VTR、VCR及監(jiān)聽(tīng)器泄漏雜音。·用于OA 設(shè)備、通信設(shè)備和其它器件。·TV set, recorder, sound-frequency equipment, show-scope, photocopy-scope, typewrite equipment, recreation-scope, computer etc.·For line filters of switchING power supplies.·Eliminates incoming/leaking noise of TVs, VTRs/VCRs and audio equipment .·For OA equipment, communications equipment and other electronic devices.

    標(biāo)簽: FILTERS POWER LINE 電源濾波器

    上傳時(shí)間: 2013-10-23

    上傳用戶:shizhanincc

  • 基于8098單片機(jī)的SPWM變頻調(diào)速系統(tǒng)

      數(shù)字控制的交流調(diào)速系統(tǒng)所選用的微處理器、功率器件及產(chǎn)生PWM波的方法是影響交流調(diào)速系統(tǒng)性能好壞的直接因素。在介紹了正弦脈寬調(diào)制(SPWM)技術(shù)的基礎(chǔ)上,設(shè)計(jì)了一種以8098單片機(jī)作為控制器,以智能功率模塊IPM為開關(guān)器件的變頻調(diào)速系統(tǒng)。通過(guò)軟件編程,產(chǎn)生正弦脈沖寬度調(diào)制波形來(lái)控制絕緣柵雙極晶體管的導(dǎo)通和關(guān)斷,從而達(dá)到控制異步電動(dòng)機(jī)轉(zhuǎn)速的目的。實(shí)驗(yàn)結(jié)果表明,該系統(tǒng)可調(diào)頻率調(diào)電壓,穩(wěn)定度高,調(diào)速范圍寬,具有較強(qiáng)的實(shí)用價(jià)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.  

    標(biāo)簽: 8098 SPWM 單片機(jī) 變頻調(diào)速系統(tǒng)

    上傳時(shí)間: 2013-11-14

    上傳用戶:ynwbosss

  • 單片機(jī)控制的鉛酸蓄電池充電電源

     為了有效地提升鉛酸蓄電池的使用壽命,同時(shí)實(shí)現(xiàn)對(duì)充電過(guò)程的監(jiān)控,設(shè)計(jì)出一種用單片機(jī)控制的36 V鉛酸蓄電池充電電源。本電路采用反激式拓?fù)洌B續(xù)電流工作模式,電源管理IC設(shè)計(jì)在電源的副邊,由ELAN公司的EM78P258N單片機(jī)模擬,是用可編程器件模擬電源管理IC,實(shí)現(xiàn)智能電源低成本化的一次成功嘗試,通過(guò)對(duì)單片機(jī)的軟件設(shè)計(jì)實(shí)現(xiàn)了充電電源的狀態(tài)顯示、充電時(shí)間控制、報(bào)警、過(guò)溫保護(hù)、過(guò)壓保護(hù)、過(guò)流保護(hù)等功能。本充電器真正的實(shí)現(xiàn)了鉛酸蓄電池的三段式充電過(guò)程,其最高輸出功率可達(dá)90 W,效率約85%,成本不到20元,具有很高的市場(chǎng)競(jìng)爭(zhēng)力。 Abstract:  In order to extend the life of lead-acid battery efficiently and supervise the charging process meanwhile, a 36V lead-acid battery charge powe supply controlled by microcontroller is designed. The charger is flyback switchING power supply and works in CCM mode. A EM78P258N microcontroller made by ELAN microelectronics corporation is used as power management IC which is designed at the secondary circuit. The project is a successful attempt to low-cost intelligent power used microcontroller simulating power management IC. The charger also has the functions of the status reveal, charge time control, alarming, thermal protect, current limit and overvoltage protect by the software design. The circuit actually implements the three-step charge process, whose power is up to 90W and whose efficiency can get 85%. The net cost of this charger is less than 20 RMB, so that the charger is of powerful market competitiveness.    

    標(biāo)簽: 單片機(jī)控制 充電電源 鉛酸蓄電池

    上傳時(shí)間: 2013-11-16

    上傳用戶:cepsypeng

  • 基于C8051F040的以太網(wǎng)-CAN轉(zhuǎn)換電路設(shè)計(jì)

    以太網(wǎng)和CAN總線應(yīng)用廣泛,但由于其通信協(xié)議不同,兩種總線器件間無(wú)法進(jìn)行數(shù)據(jù)通信,因此,設(shè)計(jì)了基于CP2200與C8051F040的以太網(wǎng)總線與CAN總線接口轉(zhuǎn)換電路,并給出部分相關(guān)硬件電路與軟件設(shè)計(jì)分析。在保證數(shù)據(jù)完整和協(xié)議可靠的前提下,通過(guò)握手協(xié)議和簡(jiǎn)化的以太網(wǎng)協(xié)議,不僅實(shí)現(xiàn)了以太網(wǎng)數(shù)據(jù)與CAN數(shù)據(jù)的轉(zhuǎn)發(fā),同時(shí)還順利的解決了以太網(wǎng)的高速性與CAN的低速率沖突,以及兩者數(shù)據(jù)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.

    標(biāo)簽: C8051F040 CAN 以太網(wǎng) 轉(zhuǎn)換

    上傳時(shí)間: 2013-10-15

    上傳用戶:Ants

  • PCF8578 LCD圖形點(diǎn)陣液晶驅(qū)動(dòng)器芯片簡(jiǎn)介及封裝庫(kù)

    The PCF8578 is a low power CMOS1 LCD row and column driver, designed to drive dotmatrix graphic displays at multiplex rates of 1:8, 1:16, 1:24 or 1:32. The device has40 outputs, of which 24 are programmable and configurable for the following ratios ofrows/columns: 32¤8, 24¤16, 16¤24 or 8¤32. The PCF8578 can function as a stand-alone LCDcontroller and driver for use in small systems. For larger systems it can be used inconjunction with up to 32 PCF8579s for which it has been optimized. Together these twodevices form a general purpose LCD dot matrix driver chip set, capable of driving displaysof up to 40960 dots. The PCF8578 is compatible with most microcontrollers andcommunicates via a two-line bidirectional bus (I2C-bus). Communication overhead isminimized by a display RAM with auto-incremented addressing and display bankswitchING.

    標(biāo)簽: 8578 PCF LCD 圖形點(diǎn)陣

    上傳時(shí)間: 2013-10-23

    上傳用戶:頂?shù)弥?/p>

  • Keil C51使用詳解

    Keil C51使用詳解Keil C51 是美國(guó)Keil Software 公司出品的51 系列兼容單片機(jī)C 語(yǔ)言軟件開發(fā)系統(tǒng),與匯編相比,C 語(yǔ)言在功能上、結(jié)構(gòu)性、可讀性、可維護(hù)性上有明顯的優(yōu)勢(shì),因而易學(xué)易用。用過(guò)匯編語(yǔ)言后再使用C 來(lái)開發(fā),體會(huì)更加深刻。Keil C51 軟件提供豐富的庫(kù)函數(shù)和功能強(qiáng)大的集成開發(fā)調(diào)試工具,全Windows界面。另外重要的一點(diǎn),只要看一下編譯后生成的匯編代碼,就能體會(huì)到Keil C51生成的目標(biāo)代碼效率非常之高,多數(shù)語(yǔ)句生成的匯編代碼很緊湊,容易理解。在開發(fā)大型軟件時(shí)更能體現(xiàn)高級(jí)語(yǔ)言的優(yōu)勢(shì)。下面詳細(xì)介紹 Keil C51 開發(fā)系統(tǒng)各部分功能和使用。第二節(jié) Keil C51 單片機(jī)軟件開發(fā)系統(tǒng)的整體結(jié)構(gòu)C51 工具包的整體結(jié)構(gòu),如圖(1)所示,其中uVision 與Ishell 分別是C51 forWindows 和for Dos 的集成開發(fā)環(huán)境(IDE),可以完成編輯、編譯、連接、調(diào)試、仿真等整個(gè)開發(fā)流程。開發(fā)人員可用IDE 本身或其它編輯器編輯C 或匯編源文件。然后分別由C51 及A51 編譯器編譯生成目標(biāo)文件(.OBJ)。目標(biāo)文件可由LIB51 創(chuàng)建生成庫(kù)文件,也可以與庫(kù)文件一起經(jīng)L51 連接定位生成絕對(duì)目標(biāo)文件(.ABS)。ABS 文件由OH51 轉(zhuǎn)換成標(biāo)準(zhǔn)的Hex 文件,以供調(diào)試器dScope51 或tScope51 使用進(jìn)行源代碼級(jí)調(diào)試,也可由仿真器使用直接對(duì)目標(biāo)板進(jìn)行調(diào)試,也可以直接寫入程序存貯器如EPROM 中。圖(1) C51 工具包整體結(jié)構(gòu)圖第三節(jié) Keil C51 工具包的安裝81. C51 for Dos在 Windows 下直接運(yùn)行軟件包中DOS\C51DOS.exe 然后選擇安裝目錄即可。完畢后欲使系統(tǒng)正常工作須進(jìn)行以下操作(設(shè)C:\C51 為安裝目錄):修改 Autoexec.bat,加入path=C:\C51\BinSet C51LIB=C:\C51\LIBSet C51INC=C:\C51\INC然后運(yùn)行Autoexec.bat2. C51 for Windows 的安裝及注意事項(xiàng):在 Windows 下運(yùn)行軟件包中WIN\Setup.exe,最好選擇安裝目錄與C51 for Dos相同,這樣設(shè)置最簡(jiǎn)單(設(shè)安裝于C:\C51 目錄下)。然后將軟件包中crack 目錄中的文件拷入C:\C51\Bin 目錄下。第四節(jié) Keil C51 工具包各部分功能及使用簡(jiǎn)介1. C51 與A51(1) C51C51 是C 語(yǔ)言編譯器,其使用方法為:C51 sourcefile[編譯控制指令]或者 C51 @ commandfile其中 sourcefile 為C 源文件(.C)。大量的編譯控制指令完成C51 編譯器的全部功能。包控C51 輸出文件C.LST,.OBJ,.I 和.SRC 文件的控制。源文件(.C)的控制等,詳見(jiàn)第五部分的具體介紹。而 Commandfile 為一個(gè)連接控制文件其內(nèi)容包括:.C 源文件及各編譯控制指令,它沒(méi)有固定的名字,開發(fā)人員可根據(jù)自己的習(xí)慣指定,它適于用控制指令較多的場(chǎng)合。(2) A51A51 是匯編語(yǔ)言編譯器,使用方法為:9A51 sourcefile[編譯控制指令]或 A51 @ commandfile其中sourcefile 為匯編源文件(.asm或.a51),而編譯控制指令的使用與其它匯編如ASM語(yǔ)言類似,可參考其他匯編語(yǔ)言材料。Commandfile 同C51 中的Commandfile 類似,它使A51 使用和修改方便。2. L51 和BL51(1) L51L51 是Keil C51 軟件包提供的連接/定位器,其功能是將編譯生成的OBJ 文件與庫(kù)文件連接定位生成絕對(duì)目標(biāo)文件(.ABS),其使用方法為:L51 目標(biāo)文件列表[庫(kù)文件列表] [to outputfile] [連接控制指令]或 L51 @Commandfile源程序的多個(gè)模塊分別經(jīng) C51 與A51 編譯后生成多個(gè)OBJ 文件,連接時(shí),這些文件全列于目標(biāo)文件列表中,作為輸入文件,如果還需與庫(kù)文件(.LiB)相連接,則庫(kù)文件也必須列在其后。outputfile 為輸文件名,缺少時(shí)為第一模塊名,后綴為.ABS。連接控制指令提供了連接定位時(shí)的所有控制功能。Commandfile 為連接控制文件,其具體內(nèi)容是包括了目標(biāo)文件列表,庫(kù)文件列表及輸出文件、連接控制命令,以取代第一種繁瑣的格式,由于目標(biāo)模塊庫(kù)文件大多不止1 個(gè),因而第2 種方法較多見(jiàn),這個(gè)文件名字也可由使用者隨意指定。(2) Bl51BL51 也是C51 軟件包的連接/定位器,其具有L51 的所有功能,此外它還具有以下3 點(diǎn)特別之處:a. 可以連接定位大于64kBytes 的程序。b. 具有代碼域及域切換功能(CodeBanking & Bank switchING)c. 可用于RTX51 操作系統(tǒng)RTX51 是一個(gè)實(shí)時(shí)多任務(wù)操作系統(tǒng),它改變了傳統(tǒng)的編程模式,甚至不必用main( )函數(shù),單片機(jī)系統(tǒng)軟件向RTOS 發(fā)展是一種趨勢(shì),這種趨勢(shì)對(duì)于186 和38610及68K 系列CPU 更為明顯和必須,對(duì)8051 因CPU 較為簡(jiǎn)單,程序結(jié)構(gòu)等都不太復(fù)雜,RTX51 作用顯得不太突出,其專業(yè)版軟件PK51 軟件包甚至不包括RTX51Full,而只有一個(gè)RTX51TINY 版本的RTOS。RTX51 TINY 適用于無(wú)外部RAM 的單片機(jī)系統(tǒng),因而可用面很窄,在本文中不作介紹。Bank switchING 技術(shù)因使用很少也不作介紹。3. DScope51,Tscope51 及Monitor51(1) dScope51dScope51 是一個(gè)源級(jí)調(diào)試器和模擬器,它可以調(diào)試由C51 編譯器、A51 匯編器、PL/M-51 編譯器及ASM-51 匯編器產(chǎn)生的程序。它不需目標(biāo)板(for windows 也可通過(guò)mon51 接目標(biāo)板),只能進(jìn)行軟件模擬,但其功能強(qiáng)大,可模擬CPU 及其外圍器件,如內(nèi)部串口,外部I/O 及定時(shí)器等,能對(duì)嵌入式軟件功能進(jìn)行有效測(cè)試。

    標(biāo)簽: Keil C51 使用詳解

    上傳時(shí)間: 2013-11-01

    上傳用戶:zhouxuepeng1

  • PCA9549 Octal bus switch with

    The PCA9549 provides eight bits of high speed TTL-compatible bus switchING controlledby the I2C-bus. The low ON-state resistance of the switch allows connections to be madewith minimal propagation delay. Any individual A to B channel or combination of channelscan be selected via the I2C-bus, determined by the contents of the programmable Controlregister. When the I2C-bus bit is HIGH (logic 1), the switch is on and data can flow fromPort A to Port B, or vice versa. When the I2C-bus bit is LOW (logic 0), the switch is open,creating a high-impedance state between the two ports, which stops the data flow.An active LOW reset input (RESET) allows the PCA9549 to recover from a situationwhere the I2C-bus is stuck in a LOW state. Pulling the RESET pin LOW resets the I2C-busstate machine and causes all the bits to be open, as does the internal power-on resetfunction.

    標(biāo)簽: switch Octal 9549 with

    上傳時(shí)間: 2014-11-22

    上傳用戶:xcy122677

  • 1A SIMPLE STEP-DOWN switchING

    The TL2575 and TL2575HV represent superior alternatives to popular three-terminal linear regulators. Due totheir high efficiency, the devices significantly reduce the size of the heatsink and, in many cases, no heatsink isrequired. Optimized for use with standard series of inductors available from several different manufacturers, theTL2575 and TL2575HV greatly simplify the design of switch-mode power supplies by requiring a minimaladdition of only four to six external components for operation.

    標(biāo)簽: STEP-DOWN switchING SIMPLE 1A

    上傳時(shí)間: 2013-11-20

    上傳用戶:jelenecheung

  • 高壓雙管反激變換器的設(shè)計(jì)

    高壓雙管反激變換器的設(shè)計(jì):介紹一種雙管反激的電路拓?fù)洌治隽似涔ぷ髟恚o出了一些關(guān)鍵技術(shù)參數(shù)的計(jì)算公式,設(shè)計(jì)并研制成功的30W 380V AC5 0H z/510V DC/+15.1 V DC(1A )、+5.2VDC(2A)輔助開關(guān)電源具有功率密度高、變換效率高、可靠性高等優(yōu)良的綜合性能。該變換器在高電壓輸人情況下有重要的應(yīng)用價(jià)值。【關(guān) 鍵 詞 】變換器,輔助開關(guān)電源,雙管反激 [Abstract】 A n e wt opologyfo rd oubles witchfl ybackc onverteris in troduced.Th eo perationp rincipleis a nalyzeda nds ome for mulas for calculating key parameters for the topology are presented. The designed and produced auxiliary switchING power supply,i. e. 30W 380V AC5 0H z/5 10V DC/+15.1 V DC《1A )、+5.2 V DC《2A ),hase xcellentc omprehensivep erformances sucha sh ighp owerd ensity, hi ghc onversione fficiencya ndh ighr eliability.Th isc onverterh asim portanta pplicationv aluef orh igh input voltag [Keywords ]converter,au xiliary switchINGp owers upply,do ubles witchf lybac

    標(biāo)簽: 雙管反激 變換器

    上傳時(shí)間: 2013-11-01

    上傳用戶:Ants

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