Integrated EMI/Thermal Design forSwitching Power SuppliesWei ZhangThesis submitted to the Faculty of theVirginia Polytechnic Institute and State Universityin partial fulfillment of the requirements for the degree of Integrated EMI/Thermal Design forSwitching Power SuppliesWei Zhang(ABSTRACT)This work presents the modeling and analysis of EMI and thermal performancefor switch power supply by using the CAD tools. The methodology and design guidelinesare Developed.By using a boost PFC circuit as an example, an equivalent circuit model is builtfor EMI noise prediction and analysis. The parasitic elements of circuit layout andcomponents are extracted analytically or by using CAD tools. Based on the model, circuitlayout and magnetic component design are modified to minimize circuit EMI. EMI filtercan be designed at an early stage without prototype implementation.In the second part, thermal analyses are conducted for the circuit by using thesoftware Flotherm, which includes the mechanism of conduction, convection andradiation. Thermal models are built for the components. Thermal performance of thecircuit and the temperature profile of components are predicted. Improved thermalmanagement and winding arrangement are investigated to reduce temperature.In the third part, several circuit layouts and inductor design examples are checkedfrom both the EMI and thermal point of view. Insightful information is obtained.
上傳時間： 2013-11-10
上傳用戶：1595690
Occasionally, we are tasked with designing circuitry for aspecific purpose. The request may have customer originsor it may be an in-house requirement. Alternately, a circuitmay be Developed because its possibility is simply tooattractive to ignore1. Over time, these circuits accumulate,encompassing a wide and useful body of proven capabilities.They also represent substantial effort. These considerationsmake publication an almost obligatory propositionand, as such, a group of circuits is presented here. This isnot the first time we have displayed such wares and, giventhe encouraging reader response, it will not be the last2.Eighteen circuits are included in this latest effort, roughlyarranged in the categories given in this publication’s title.They appear at the next paragraph.
上傳時間： 2013-11-12
上傳用戶：012345
Notebook and palmtop systems need a multiplicity ofregulated voltages Developed from a single battery. Smallsize, light weight, and high efficiency are mandatory forcompetitive solutions in this area. Small increases inefficiency extend battery life, making the final productmuch more usable with no increase in weight. Additionally,high efficiency minimizes the heat sinks needed onthe power regulating components, further reducing systemweight and size.
上傳時間： 2013-11-11
上傳用戶：大三三
Providing power for the Pentium® microprocessor family isnot a trivial task by any means. In an effort to simplify thistask we have Developed a new switching regulator controlcircuit and a new linear regulator to address the needs ofthese processors. Considerable time has been spent developingan optimized decoupling network. Here are severalcircuits using the new LTC®1266 synchronous buck regulatorcontrol chip and the LT®1584 linear regulator toprovide power for Pentium processors and Pentium VREprocessors. The Pentium processor has a supply requirementof 3.3V ±5%. The Pentium VRE processor requires3.500V ±100mV.
上傳時間： 2013-11-01
上傳用戶：名爵少年
為解決我國水位監(jiān)測野外條件下長期無人看守的問題，研制開發(fā)了基于MSP430單片機的智能水位計。從其組成到各功能分別進行了詳細的介紹，該智能水位計不僅實現(xiàn)了水位數(shù)據(jù)的實時監(jiān)測、記錄和定期采集等多種工作模式，而且提高了水位監(jiān)測精度，實現(xiàn)了水位監(jiān)測的智能化。 Abstract: In order to solve the problems of long-term unmanned observation in the field water monitoring，an intelligence water-level meter based on MSP430 is Developed composition and every function moduce of the water level meter was introduced in detail. It not only realizes water level data collection and storage， regularly gathering and so on， but also improves the water-level precision ， finally realizes the intelligence.
上傳時間： 2013-11-17
上傳用戶：417313137
設計一種基于P89V51RD2的功率因數(shù)測量儀，采用光電隔離器和專用數(shù)碼管驅動器。該測量儀是以增強型單片機P89V51RD2為核心，大大簡化系統(tǒng)硬件設計。而軟件部分采用模塊化設計思想，采用中值濾波和小數(shù)補償算法，實現(xiàn)功率因數(shù)的高精度測量。實驗測試表明，該功率因數(shù)測量儀測量精度高，運行穩(wěn)定可靠。 Abstract: A power－factor measurement instrument based on P89V51RD2is designed，which uses optical coupler and specific LED drive chip.The power factor measurement instrument uses P89V51RD2as a core of which greatly simplifies the system design.Furthermore，modularization software is Developed in detail.The high precision power－factor measuring system is realized by the center value filter and fractional compensation algorithm.Experiments manifests that the power－ factor measurement instrument is high precision，steady and reliable.
上傳時間： 2014-12-27
上傳用戶：CHINA526
應用德國Micronas公司的CDC3207G微控制器開發(fā)了一款汽車儀表板系統(tǒng)。詳細地介紹了該系統(tǒng)的硬件原理，以及步進電機，音頻控制，LCD顯示，LED指示燈和報警燈等幾個模塊的實現(xiàn)方法。應用μC/OS-II實時操作系統(tǒng)開發(fā)軟件。著重介紹了啟動代碼的設計和任務的規(guī)劃。 Abstract: A dashboard system is Developed by using CDC3207G microcontroller made by Micronas.The hardware of the sys-tem and the realization of the step motor module,audio module,LCD display and LED indicator and alarm module are ex-plained in detail.The μC/OS-II real-time operating system is used for the software development and the starting code design and the task planning is explained specifically.
上傳時間： 2013-10-26
上傳用戶：x4587
為了提高環(huán)境參數(shù)采集的自動化水平，提升效率，設計了無線傳感器系統(tǒng)。本系統(tǒng)運用了傳感器技術、通信技術和單片機技術，實現(xiàn)了對環(huán)境溫度、濕度、光照度以及可燃性氣體濃度等參數(shù)的檢測。它能夠實時地與上位機進行無線通信，滿足對環(huán)境參數(shù)實時監(jiān)測的要求。 Abstract: In order to increase the degree of automation and improve the efficiency of the environment monitoring parameters，the wireless sensor system was Developed.Combining with the technique of sensor,automatic monitoring，communication and single-chip microcomputer，it realized real-time monitoring environment parameters,such as temperature，humidity，illumination，concentration of com- bustible gas and so on.At the same time it can communicate with upper personal computers，satisfy the desire of real-time monitoring.
上傳時間： 2013-11-22
上傳用戶：longlong12345678
針對船舶氣象儀保障維修而設計的船舶氣象儀測試系統(tǒng)，包括信息處理終端、主儀器檢測模塊、傳感器檢測模塊，各個模塊都采用基于AVR單片機的嵌入式系統(tǒng)，模塊之間通過CAN總線進行通信。結果表明，船舶氣象儀測試系統(tǒng)能夠快速檢測船舶氣象儀故障，與單純依靠人工方式排查故障相比，故障檢測時間縮短了60%以上。 Abstract: The test system of ship meteorological instrument was Developed to satisfy the maintenance of ship meteorological instruments，which composed of information processing terminal， testing module of main instrument and testing module of sensors. Each of these modules included an embedded system based on microcontroller of AVR series and communicated with other module by CAN bus. The results show that the test system can judge the fault of ship meteorological instrument quickly and shorten the fault detection time as much as 60% compared with simple manual troubleshooting.
標簽： AVR 單片機 氣象儀 測試系統(tǒng)
上傳時間： 2013-11-23
上傳用戶：stvnash
介紹了一種基于MSP430系列單片機和ADXL203加速度傳感器的數(shù)字式傾角儀，它不僅可以實現(xiàn)水平度檢測，而且可以測量00～3600范圍內的任意傾角，分辨率可達O．1。。此外，由于該傾角儀輸出為數(shù)字結果，因此它也可以與其他的數(shù)字設備結合起來，組合成一個功能更加強大的儀器。該數(shù)字傾角儀可廣泛應用于建筑、機械、道路、橋梁、石油、煤礦和地質勘探等各種需要測量重力參考系下傾角的場合。關鍵詞：MSP430F133單片機；力敏傳感器；ADXL203加速度計；角度測量 Abstract：This paper presents a new style digital inclinometer which is Developed on the basis of the MSP430F133 MCU and the ADXL203 dual axis aeeelerometer．This inclinometer not only can test levelness，but also can measure any angle between 0。and 360。with an accuracy of 0．1 O．In addition，its output is a digital result，which makes it possible to integrate itself with other digital devices to form a more functional unit．This inclinometer can be widely used in any construction site，oil field，coal-mine or geologic survey and SO on where it will provide the working people with convenience to measure any angles．Key words：MSP430F133 MCU；force sensor；ADXL203 accelerometer；angle measurement
上傳時間： 2013-11-14
上傳用戶：lizhizheng88
