stract With global drivers such as better energy consumption, energy efficiency and reduction of greenhouse gases, CO 2 emission reduction has become key in every layer of the value chain. Power Electronics has definitely a role to play in these thrilling challenges. From converters down to compound semiconductors, innovation is leading to breakthrough technologies. Wide BandGap, Power Module Packaging, growth of Electric Vehicle market will game change the overall power electronic industry and supply chain. In this presentation we will review power electronics trends, from technologies to markets.
標(biāo)簽： Electronics Materials Power WBG for
上傳時(shí)間： 2020-06-07
上傳用戶：shancjb
With all the recent hype over radio frequency identification (RFID) and the requirements to implement it, you might think that RFID can turn water into wine, transform lead into gold, and cure the world’s diseases. You might also be worried that RFID will enable Big Brother to track your move- ments to within a foot of your location from a satellite five hundred miles up in space. The truth is, RFID can do none of these things. In this chapter, you find out the basics of what RFID is, what forces are dri- ving RFID as a replacement for the bar code in the marketplace, and what benefits RFID can offer
標(biāo)簽： ForDummies_RFID_For_Dummies
上傳時(shí)間： 2020-06-08
上傳用戶：shancjb
Software-defined radios (SDRs) have been around for more than a decade. The first complete Global Positioning System (GPS) implementation was described by Dennis Akos in 1997. Since then several research groups have presented their contributions. We therefore find it timely to publish an up-to-date text on the sub- ject and at the same time include Galileo, the forthcoming European satellite- based navigation system. Both GPS and Galileo belong to the category of Global Navigation Satellite Systems (GNSS).
標(biāo)簽： A_Software-Defined_GPS_and_Galile o_Receiver
上傳時(shí)間： 2020-06-09
上傳用戶：shancjb
Many applications have required the positioning accuracy of a Global Navigation Satellite System (GNSS). Some applications exist in environments that attenuate GNSS signals, and, consequently, the received GNSS signals become very weak. Examplesofsuchapplicationsarewirelessdevicepositioning,positioninginsensor networks that detect natural disasters, and orbit determination of geostationary and high earth orbit (HEO) satellites. Conventional GNSS receivers are not designed to work with weak signals. This book presents novel GNSS receiver algorithms that are designed to work with very weak signals.
標(biāo)簽： Receivers Signals GNSS Weak for
上傳時(shí)間： 2020-06-09
上傳用戶：shancjb
As you may have guessed from the title, this book is about GPS (the satellite-based Global Positioning System) and maps; digital maps to be exact.
標(biāo)簽： GPS_for_Dummie
上傳時(shí)間： 2020-06-09
上傳用戶：shancjb
Of the various applications that satellites have been used for, one of the most promising is that of global positioning. Made possible by Global Navigation Satellite Systems, global positioning enables any user to know his or her exact position on Earth. Nowadays, the only fully functioning system is the American Global Positioning System (GPS). However, the European system, known as Galileo, is expected to be operative in 2012.
上傳時(shí)間： 2020-06-09
上傳用戶：shancjb
Research on microwave power amplififiers has gained a growing importance demanded by the many continuously developing applications which require such subsystem performance. A broad set of commercial and strategic systems in fact have their overall performance boosted by the power amplififier, the latter becoming an enabling component wherever its effificiency and output power actually allows functionalities and operating modes previously not possible. This is the case for the many wireless systems and battery-operated systems that form the substrate of everyday life, but also of high-performance satellite and dual-use systems.
標(biāo)簽： 高效率 射頻 微波 固態(tài) 功率放大器
上傳時(shí)間： 2021-10-30
上傳用戶：得之我幸78
一種通用微型飛行控制器設(shè)計(jì) 105頁摘 要 微小型無人機(jī)(Micro／Mini UnmannedAerial Vehicle，M【，AV)在現(xiàn)代軍事和國民經(jīng)濟(jì)中發(fā) 揮著越來越重要的作用。飛行控制器是無人機(jī)系統(tǒng)的核心，它自動采集無人機(jī)的各種飛行參數(shù)， 輸出舵面／油門指令以控制無人機(jī)的姿態(tài)和軌跡，使無人機(jī)能在沒有人工操縱干預(yù)的情況下自主 飛行，完成預(yù)定的任務(wù)。因此，研制高性能的飛行控制器對改善無人機(jī)的飛行性能以及提高任 務(wù)完成效率都具有重要的意義。 本文著重研究一種通用微型飛行控制器(General Micro Flight Controller，GMFC)，以適用 于小型／微型固定翼飛行器、旋翼飛行器、飛艇以及移動機(jī)器人的控制。論文的主要工作涉及 GMFC的硬件設(shè)計(jì)與軟件實(shí)現(xiàn)，具體內(nèi)容包括： 1)分析了微型飛行控制器在國內(nèi)外的研究現(xiàn)狀和發(fā)展趨勢，根據(jù)任務(wù)需求和設(shè)計(jì)指標(biāo)確定 一種通用型、微型化、低功耗、高性能、低成本的嵌入式微型飛行控制器的整體方案。 2)設(shè)計(jì)了基于ARM的通用微型飛行控制器的硬件系統(tǒng)，包括主控模塊、慣性測量單元、 靜壓高度計(jì)、遙控信號接收單元、數(shù)據(jù)通信模塊、電源模塊、附加傳感器模塊等；完成了整個(gè) 控制器的PCB制作以及對所有電路的調(diào)試工作，使得系統(tǒng)運(yùn)作正常。 3)研究了基于卡爾曼濾波算法的姿態(tài)參考系統(tǒng)，并對姿態(tài)參考系統(tǒng)的靜態(tài)性能和動態(tài)性能 進(jìn)行測試。 4)設(shè)計(jì)了小型四旋翼飛行器本體平臺并對其進(jìn)行動力學(xué)建模仿真； 5)在此基礎(chǔ)上，結(jié)合四旋翼飛行器試驗(yàn)平臺設(shè)計(jì)了飛行控制律，開發(fā)了GMFC的軟件系 統(tǒng)，并開展物理實(shí)驗(yàn)驗(yàn)證。
標(biāo)簽： 飛行控制器
上傳時(shí)間： 2022-03-15
上傳用戶：zhaiyawei
對某四輪獨(dú)立驅(qū)動電動汽車輪轂電機(jī)進(jìn)行研究,設(shè)計(jì)一種永磁無刷直流電機(jī)控制器.以STM32F103RBT6芯片為基礎(chǔ),對電機(jī)驅(qū)動電路、采樣電路和保護(hù)電路分別進(jìn)行硬件設(shè)計(jì)與分析;同時(shí),采用模塊化軟件設(shè)計(jì)方案,對該控制器的軟件系統(tǒng)進(jìn)行升級.實(shí)驗(yàn)驗(yàn)證表明:所設(shè)計(jì)的電機(jī)控制器能使電機(jī)響應(yīng)迅速、轉(zhuǎn)速穩(wěn)定、無超調(diào),且電動車動力輸出性能良好.A permanent magnet brushless direct current motor controller was designed by studying the hub motor of a four-wheel independent drive electric vehicle.Based on STM32 F103RBT6 chip,the hardware design and analysis of motor drive circuit,sampling circuit and protection circuit were carried out respectively.At the same time,modular software design scheme was adopted to upgrade the software system of the controller.Experimental results show that the designed motor controller can ensure the motor fast response,stable speed,no overshoot,and good power output performances.
標(biāo)簽： 電動汽車 永磁無刷直流電機(jī)
上傳時(shí)間： 2022-03-26
上傳用戶：qingfengchizhu
隨著光伏發(fā)電系統(tǒng)快速發(fā)展,以及電動汽車充電樁的普及,傳統(tǒng)的剩余電流保護(hù)器無法滿足實(shí)際需求。介紹了一款B型剩余電流保護(hù)器,采用磁調(diào)制剩余電流互感器和零序電流互感器采集剩余電流。根據(jù)GB/T 22794—2017標(biāo)準(zhǔn)要求,可識別1 kHz及以下的正弦交流、帶和不帶直流分量的脈動直流、平滑直流等剩余電流信號。經(jīng)信號調(diào)理電路將電壓信號送到單片機(jī)進(jìn)行采集和判斷。通過試驗(yàn)測試,該樣機(jī)在測試精度和速度上均符合國家標(biāo)準(zhǔn)的相關(guān)要求。The rapid development of photovoltaic power generation systems and the popularity of electric vehicle charging piles make the traditional residual current protective devices unable to meet the actual demand.This paper proposed a type B residual current protective device,which uses the magnetically modulated residual current transformer and the zero sequence current transformer to acquire the residual current.According to the requirements of GB/T 22794—2017,the type B residual current protective device can detect sinusoidal AC residual current of 1kHz and below 1kHz,pulsating DC residual current with and without DC component,smooth DC residual current and so on.The signal processing circuit sends the voltage signal to the MCU for acquisition and judgment.Through experimental tests,the device meets the relevant requirements of national standards in terms of test accuracy and speed.
標(biāo)簽： 電流保護(hù)器
上傳時(shí)間： 2022-03-27
上傳用戶：
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