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Many telecommunications and computing applicationsneed high effi ciency step-down DC/DC converters thatcan operate from a very low input voltage. The highoutput power synchronous controller LT3740 is idealfor these applications, converting input supplies rangingfrom 2.2V to 22V to outputs as low as 0.8V with loadcurrents from 2A to 20A. Applications include distributedpower systems, point-of-load regulation and conversionof logic supplies.
上傳時(shí)間： 2013-11-05
上傳用戶(hù)：zhf01y
Advances in low power electronics now allow placementof battery-powered sensors and other devices in locationsfar from the power grid. Ideally, for true grid independence,the batteries should not need replacement, but instead berecharged using locally available renewable energy, suchas solar power. This Design Note shows how to producea compact battery charger that operates from a small2-cell solar panel. A unique feature of this design is thatthe DC/DC converter uses power point control to extractmaximum power from the solar panel.
標(biāo)簽： 太陽(yáng)能電池板 電池充電 技術(shù)手冊(cè)
上傳時(shí)間： 2014-01-20
上傳用戶(hù)：wettetw
Abstract: As electronic systems take over many of the mechanical functions in a car—ranging from engine timing to steering andbraking—there is a growing concern about fault tolerance. There should not be a single point of failure that would prevent a car fromat least "limping" off the road or making it to the nearest service station. Redundant systems, watchdog timers, and other controlcircuits are used to reroute signals and perform other functions that ensure that a vehicle can safely make it off the road when afailure occurs.
標(biāo)簽： 看門(mén)狗定時(shí)器 汽車(chē)安全系統(tǒng)
上傳時(shí)間： 2013-11-10
上傳用戶(hù)：diets
This ink marks LTC’s eighth circuit collection publication.1We are continually surprised, to the point of near mystification, by these circuit amalgams seemingly limitlessappeal. Reader requests ascend rapidly upon publication,remaining high for years, even decades. All LTC circuitcollections, despite diverse content, share this popularity,although just why remains an open question. Why isit? Perhaps the form; compact, complete, succinct andinsular. Perhaps the freedom of selection without commitment,akin to window shopping.
標(biāo)簽： 電源轉(zhuǎn)換 測(cè)量 脈沖電路
上傳時(shí)間： 2014-01-06
上傳用戶(hù)：ligi201200
為解決直流逆變交流的問(wèn)題，有效地利用能源，讓電源輸出最大功率，設(shè)計(jì)了高性能的基于IR2101最大功率跟蹤逆變器，并以SPMC75F2413A單片機(jī)作為主控制器。高電壓、高速功率的MOSFET或IGBT驅(qū)動(dòng)器IR2101采用高度集成的電平轉(zhuǎn)換技術(shù)，同時(shí)上管采用外部自舉電容上電，能夠穩(wěn)定高效地驅(qū)動(dòng)MOS管。該逆變器可以實(shí)現(xiàn)DC/AC的轉(zhuǎn)換，最大功率點(diǎn)的跟蹤等功能。實(shí)際測(cè)試結(jié)果表明，該逆變器系統(tǒng)具有跟蹤能力強(qiáng)，穩(wěn)定性高，反應(yīng)靈敏等特點(diǎn)，該逆變器不僅可應(yīng)用于普通的電源逆變系統(tǒng)，而且可應(yīng)用于光伏并網(wǎng)發(fā)電的逆變系統(tǒng)，具有廣泛的市場(chǎng)前景。 Abstract: To solve the problem of DC-AC inverter， and to utilize solar energy more efficiently， the design of maximum power point tracking inverter based on IR2101 was achieved with a high-performance， which can make the system output power maximum. SPMC75F2413A was adopted as main controller. IR2101 is a high voltage， high speed power MOSFET and IGBT driver. It adopted highly integrated voltage level transforming technology， and an external bootstrap capacitor was used， which could drive MOS tube efficiently and stably. Many functions are achieved in the system， such as DC/AC conversion， maximun power point tracking， etc. The actual test result shows that the inverter system has characteristics of strong tracking ability， high stability and reacting quickly. The design can not only be used in ordinary power inverter system， but also be used in photovoltaic power inverter system. The design has certain marketing prospects
上傳時(shí)間： 2013-11-17
上傳用戶(hù)：lliuhhui
The latest generation of Texas Instruments (TI) boardmountedpower modules utilizes a pin interconnect technologythat improves surface-mount manufacturability.These modules are produced as a double-sided surfacemount(DSSMT) subassembly, yielding a case-less constructionwith subcomponents located on both sides of theprinted circuit board (PCB). Products produced in theDSSMT outline use the latest high-efficiency topologiesand magnetic-component packaging. This providescustomers with a high-efficiency, ready-to-use switchingpower module in a compact, space-saving package. Bothnonisolated point-of-load (POL) switching regulators andthe isolated dc/dc converter modules are being producedin the DSSMT outline.TI’s plug-in power product line offers power modules inboth through-hole and surface-mount packages. The surfacemountmodules produced in the DSSMT outline use asolid copper interconnect with an integral solder ball fortheir
上傳時(shí)間： 2013-10-10
上傳用戶(hù)：1184599859
為了使音頻信號(hào)分析儀小巧可靠，成本低廉，設(shè)計(jì)了以2片MSP430F1611單片機(jī)為核心的系統(tǒng)。該系統(tǒng)將音頻信號(hào)送入八階巴特沃茲低通濾波器，對(duì)信號(hào)進(jìn)行限幅放大、衰減、電平位移、緩沖，并利用一單片機(jī)負(fù)責(zé)對(duì)前級(jí)處理后的模擬信號(hào)進(jìn)行采樣，將采集得到的音頻信號(hào)進(jìn)行4 096點(diǎn)基2的FFT計(jì)算，并對(duì)信號(hào)加窗函數(shù)提高分辨率，另一單片機(jī)負(fù)責(zé)對(duì)信號(hào)的分析及控制顯示設(shè)備。此設(shè)計(jì)精確的測(cè)量了音頻信號(hào)的功率譜、周期性、失真度指標(biāo)，達(dá)到較高的頻率分辨率，并能將測(cè)量結(jié)果通過(guò)紅外遙控器顯示在液晶屏上。 Abstract: o make the audio signal analyzer cheaper， smaller and more reliable， this system sends the audio signal to the eight-order butterworth filter， and then amplifies， attenuates， buffers it in a limiting range， transfers the voltage level of the signal before utilizing two MSP430F1611 MCU to realize the audio analysis. One is charged for sampling and dealing with the processed audio signal collected by the 4096 point radix-2 FFT calculation and imposes the window function to improve the frequency resolution. The other one controls the display and realizes the spectrum， periodicity， power distortion analysis in high resolution which is displayed in the LCD screen through the infrared remote control.
上傳時(shí)間： 2013-12-11
上傳用戶(hù)：jasonheung
為提高溫度測(cè)量效率，降低系統(tǒng)的成本，擴(kuò)展傳輸距離，設(shè)計(jì)出一種新型溫度采集系統(tǒng)。單片機(jī)通過(guò)控制具有單總線(xiàn)方式的溫度傳感器DS18B20實(shí)現(xiàn)對(duì)溫度的測(cè)量，同時(shí)單片機(jī)通過(guò)控制具有單總線(xiàn)方式300～450MHz頻率范圍內(nèi)的MAX7044與MAX7033無(wú)線(xiàn)發(fā)射與接收芯片實(shí)現(xiàn)溫度數(shù)據(jù)的無(wú)線(xiàn)傳輸。與傳統(tǒng)溫度采集系統(tǒng)相比，該系統(tǒng)利用單總線(xiàn)方式連接，采用無(wú)線(xiàn)傳輸方式實(shí)現(xiàn)遠(yuǎn)距離通信，易于系統(tǒng)的集成與擴(kuò)展。實(shí)驗(yàn)結(jié)果表明，該系統(tǒng)結(jié)構(gòu)簡(jiǎn)單、方便移植，能夠同時(shí)實(shí)現(xiàn)多達(dá)上百點(diǎn)溫度的測(cè)量與500m范圍的傳輸。 Abstract: To improve the temperature measurement efficiency and reduce system cost,expansion of transmission distance,a new type of temperature acquisition system is designed.Microcontroller controlled temperature sensor DS18B20which has a single-bus achieves temperature measurement,while microcontroller by controlled the MAX7044and MAX7033chip with a single-bus and having300~450MHz radiofrequency to achieve the wireless transmission of temperature data.Compared with conventional temperature acquisition system,the system uses single-bus connected,and uses wireless transmission means to achieve long-distance communications,easy-to-system integration and expansion.The experimental results show that the system is simple,convenient transplantation,and can be implemented in as many as a hundred-point temperature measure-ment and the transmission range of500meters.
標(biāo)簽： 單總線(xiàn) 無(wú)線(xiàn)溫度 采集 系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2013-10-29
上傳用戶(hù)：515414293
氣壓是氣象監(jiān)測(cè)中的一個(gè)重要參數(shù)，提出了一種氣壓數(shù)據(jù)采集模塊設(shè)計(jì)方案，該模塊采用數(shù)字氣壓傳感器MS5534B、MSP430單片機(jī)MSP430F2272和帶實(shí)時(shí)時(shí)鐘（RTC）64 KB鐵電存儲(chǔ)器。通過(guò)低功耗軟件設(shè)計(jì)方法以微安級(jí)整體平均功耗實(shí)現(xiàn)了氣壓數(shù)據(jù)的采集和存儲(chǔ)，適合電池供電的連續(xù)高精度氣壓采集應(yīng)用。給出了模塊的軟硬件設(shè)計(jì)以及MS5534B的性能指標(biāo)和使用經(jīng)驗(yàn)。 Abstract: Air pressure is an important parameter in weather monitor.This paper futs forward a new design scheme of low power-air pressure data acquisition module.The module uses a digital output barometer sensor MS5534B,MSP430 microcontroller MSP430F2272 and integrated RTC 64KB FRAM,precision air pressure measurement and storage chip.Another point of this module is low power consumption, so it is well suited for battery powered air pressure data acquisition applications. At the same time,the software and hardware deign of module is presented,And the speciaties and use notices of MS5534B are given.
上傳時(shí)間： 2014-12-27
上傳用戶(hù)：drink！
為深入了解基于UC3854A控制的PFC變換器中的動(dòng)力學(xué)特性，研究系統(tǒng)參數(shù)變化對(duì)變換器中分岔現(xiàn)象的影響，在建立Boost PFC變換器雙閉環(huán)數(shù)學(xué)模型的基礎(chǔ)上，用Matlab軟件對(duì)變換器中慢時(shí)標(biāo)分岔及混沌等不穩(wěn)定現(xiàn)象進(jìn)行了仿真。在對(duì)PFC變換器中慢時(shí)標(biāo)分岔現(xiàn)象仿真的基礎(chǔ)上，分析了系統(tǒng)參數(shù)變化對(duì)分岔點(diǎn)的影響，并進(jìn)行了仿真驗(yàn)證。仿真結(jié)果清晰地顯示了輸入整流電壓的幅值變化對(duì)系統(tǒng)分岔點(diǎn)的影響。 Abstract: In order to better understand the dynamics characteristic of power factor correction converter based on UC3854A， and make the way that parameters change influences the bifurcation phenomena of the system clearly. The math model of the two closed loop circuits to the Boost PFC （Power Factor Correction） converter controller was built. Then， with the help of Matlab， the simulation for nonlinear phenomena such as chaos and slow-scale bifurcation in the PFC converter was made. Finally the factors that have influence to the phenomenon of bifurcation under slow-scale in PFC converter were analyzed. The simulation results clearly show the parameters change influences the bifurcation point of the system.
上傳時(shí)間： 2013-10-17
上傳用戶(hù)：杜瑩12345
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