The LTM4600 DC/DC μModule regulator is a complete highpower density stepdown regulator for 10A continuous (14Apeak) loads. The Device has two voltage options: 20VINmaximum for the LTM4600EV and 28VIN maximum for theLTM4600HVEV each housed in a small 15mm ¥ 15mm ¥2.8mm LGA surface mount package.
上傳時(shí)間： 2013-10-10
上傳用戶：adada
單相橋式逆變電路為例：S1～S4是橋式電路的4個(gè)臂，由電力電子器件及輔助電路組成。S1、S4閉合，S2、S3斷開時(shí)，負(fù)載電壓uo為正S1；S1、S4斷開，S2、S3閉合時(shí)，uo為負(fù)，把直流電變成了交流電。改變兩組開關(guān)切換頻率，可改變輸出交流電頻率。圖5-1 逆變電路及其波形舉例電阻負(fù)載時(shí)，負(fù)載電流io和uo的波形相同，相位也相同。阻感負(fù)載時(shí)，io滯后于uo，波形也不同（圖5-1b）。t1前：S1、S4通，uo和io均為正。t1時(shí)刻斷開S1、S4，合上S2、S3，uo變負(fù)，但io不能立刻反向。io從電源負(fù)極流出，經(jīng)S2、負(fù)載和S3流回正極，負(fù)載電感能量向電源反饋，io逐漸減小，t2時(shí)刻降為零，之后io才反向并增大 （2）換流方式分類換流——電流從一個(gè)支路向另一個(gè)支路轉(zhuǎn)移的過程，也稱換相。開通：適當(dāng)?shù)拈T極驅(qū)動(dòng)信號(hào)就可使其開通。關(guān)斷：全控型器件可通過門極關(guān)斷。半控型器件晶閘管，必須利用外部條件才能關(guān)斷，一般在晶閘管電流過零后施加一定時(shí)間反壓，才能關(guān)斷。研究換流方式主要是研究如何使器件關(guān)斷。本章?lián)Q流及換流方式問題最為全面集中，因此在本章講述1、器件換流利用全控型器件的自關(guān)斷能力進(jìn)行換流（Device Commutation）。2、電網(wǎng)換流由電網(wǎng)提供換流電壓稱為電網(wǎng)換流（Line Commutation）。可控整流電路、交流調(diào)壓電路和采用相控方式的交交變頻電路，不需器件具有門極可關(guān)斷能力，也不需要為換流附加元件。3、負(fù)載換流由負(fù)載提供換流電壓稱為負(fù)載換流（Load Commutation）。負(fù)載電流相位超前于負(fù)載電壓的場(chǎng)合，都可實(shí)現(xiàn)負(fù)載換流。負(fù)載為電容性負(fù)載時(shí)，負(fù)載為同步電動(dòng)機(jī)時(shí)，可實(shí)現(xiàn)負(fù)載換流。
上傳時(shí)間： 2013-10-15
上傳用戶：qingdou
msp430單片機(jī)
標(biāo)簽： Erratasheet 14x x14 Device
上傳時(shí)間： 2013-10-19
上傳用戶：dick_sh
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)。通過軟件編程，產(chǎn)生正弦脈沖寬度調(diào)制波形來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
利用單片機(jī)具有的智能程序控制的特點(diǎn)，設(shè)計(jì)了基于STC89C52單片機(jī)的"二極管特性測(cè)試器"，可對(duì)二極管一般特性進(jìn)行快速測(cè)試。通過穩(wěn)定線性電流源給二極管加載恒定電流，然后由高精度模數(shù)轉(zhuǎn)換器測(cè)試其壓降，以此為基礎(chǔ)可判斷二極管好壞、檢測(cè)二極管極性和測(cè)試二極管伏安特性等，避免了用萬用表測(cè)試只能測(cè)得極性而不知其特性這一缺點(diǎn)。可用于電子設(shè)計(jì)制作過程中對(duì)二極管進(jìn)行快速測(cè)試，以確定被測(cè)二極管是否滿足電路的設(shè)計(jì)要求。 Abstract: By making good use of the intelligent control function of the Micro Controller Unit (MCU)， the diode trait tester was designed based on the STC89C52，which could be used to test the trait of a diode rapidly. By loading constant current to diode through the stable linear current source， and measuring the voltage drop of the diode by high-precision analogue-to-digital converter (ADC)， it can judge whether the diode is good or not， distinguish the polarity of the diode， and test the trait that the diode， which can avoid the fault of using a multimeter can only measure the polarity but not the trait. This Device can be used to test the trait of a diode quickly，and to make sure that whether a diode can be used in the electronic design or not.
上傳時(shí)間： 2013-11-13
上傳用戶：assef
Designing read/write Device (RWD) units for industrial RF-Identification applications is strongly facilitated by the NXP Semiconductors HITAG Reader Chip HTRC110. All needed function blocks, like the antenna driver, modulator demodulator and antenna diagnosis unit, are integrated in the HTRC110. Therefore only a minimum number of additional passive components are required for a complete RWD. This Application Note describes how to design an industrial RF-Identification system with the HTRC110. The major focus is dimensioning of the antenna, all other external components including clock and power supply, as well as the demodulation principle and its implementatio
上傳時(shí)間： 2013-10-22
上傳用戶：zhengjian
Digitemp Junior – An RS-232 Port-Powered Digital Thermometer Digitemp Jr. is a Device that is designed to measure and report ambient temperature. When connected to an RS-232 port on any PC, it will periodically measure and report in ASCII form the ambient temperature in degrees Celsius. These temperature readings can be monitored with any terminal program. If the terminal program supports capture to disk, the temperature readings can be saved to disk for further analysis with a spreadsheet program or other data analysis tool. The simple ASCII output format of Digitemp Jr. makes it rel- atively easy to write custom software for receiving, recording, and analyzing ambient temperature data. Best of all, Digitemp Jr. requires no external power sup- plies or batteries. It is powered directly by the RS-232 port.
標(biāo)簽： Microchip 232 PIC RS
上傳時(shí)間： 2013-10-21
上傳用戶：baitouyu
為解決電致變色器件的顏色變化受外界環(huán)境顏色控制的問題，設(shè)計(jì)了一種基于單片機(jī)的便攜式顏色自適應(yīng)識(shí)別電路。與傳統(tǒng)顏色識(shí)別電路相比較，該電路利用數(shù)字式的顏色傳感器來獲取外界環(huán)境顏色，產(chǎn)生的數(shù)字顏色信號(hào)易于單片機(jī)進(jìn)行處理。在電路中，下位機(jī)部分主要負(fù)責(zé)獲取電致變色器件變色參數(shù)及控制電致變色器件的顏色變化;而上位機(jī)部分主要負(fù)責(zé)把下位機(jī)獲取的電致變色器件變色參數(shù)進(jìn)行電壓到顏色的曲線擬合，并通過藍(lán)牙通信把擬合曲線參數(shù)傳遞給下位機(jī)。結(jié)果表明，該電路能自動(dòng)根據(jù)環(huán)境顏色提供-4~4 V范圍步進(jìn)為0.1 V的電壓來驅(qū)動(dòng)電致變色器件的顏色顯示，與傳統(tǒng)的顏色識(shí)別電路設(shè)計(jì)相比，識(shí)別的精度和速度都得到了明顯改善。 Abstract: In this paper， a portable adaptive circuit for color identification(PACCI) based on MCU was designed. Compared to the traditional color identification circuit， the PACCI adopts digital sensor to detect the color data from external environment and further generate digital color data， which can be processed easily by MCU. In PACCI， the slave is mainly responsible for detecting the color parameters of the corresponding elcreochromic Device and further driving it. For the master， which is mainly responsible for the color curve fitting based on the parameters of the electrochromic Device， and transmits the fitting parameters to the slave through the bluetooth Device. The results show that the PACCI can provide the basis voltage range from -4V to 4V automatically based on the colors of external environment with step as 0.1V to drive the corresponding electrochromic Device. Compared to the traditional color recognition circuit， the recognition accuracy and speed of PACCI have been improved significantly.
上傳時(shí)間： 2013-11-09
上傳用戶：franktu
Digitemp Jr. is a Device that is designed to measure and report ambient temperature. When connected to an RS-232 port on any PC, it will periodically measure and report in ASCII form the ambient temperature in degrees Celsius. These temperature readings can be monitored with any terminal program. If the terminal program supports capture to disk, the temperature readings can be saved to disk for further analysis with a spreadsheet program or other data analysis tool. The simple ASCII output format of Digitemp Jr. makes it relatively easy to write custom software for receiving, recording, and analyzing ambient temperature data. Best of all, Digitemp Jr. requires no external power supplies or batteries. It is powered directly by the RS-232 port.
上傳時(shí)間： 2013-10-20
上傳用戶：Maple
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
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