Advancements in board assembly, PCB layout anddigital IC integration have produced a new generationof densely populated, high performance systems. Theboard-mounted point-of-load (POL) DC/DC power suppliesin these systems are subject to the same demandingsize, high power and performance requirements asother subsystems. The rigorous new POL demands aredifficult to meet with traditional controller or regulatorICs, or power modules.
上傳時(shí)間： 2014-12-24
上傳用戶：lbbyxmraon
Speed and accuracy don’t always go hand-in-handin DC/DC converter systems—that is, until now. TheLTC3811 is a dual output, fi xed frequency current modeDC/DC switching regulator controller designed for one oftoday’s most demanding power supply applications: highcurrent, low voltage processor core supplies.
上傳時(shí)間： 2013-11-21
上傳用戶：aix008
DC-link Automotive: MKP1849 (Customized)電動(dòng)汽車電驅(qū)直流母線電容（顧客訂制品）MKP1849系列.MKP1849-可集成母線排，大大降低了寄生電感，提高了系統(tǒng)穩(wěn)定性。
標(biāo)簽： DC-LINK 電動(dòng)汽車 電容
上傳時(shí)間： 2013-10-13
上傳用戶：nanfeicui
AN22 details the theoretical and application aspects of the LT1088 thermal RMS/DC converter. The basic theory behind thermal RMS/DC conversion is discussed and design details of the LT1088 are presented. Circuitry for RMS/DC converters, wideband input buffers and heater protection is shown.
標(biāo)簽： 100 MHz RMS 轉(zhuǎn)換
上傳時(shí)間： 2013-10-16
上傳用戶：china97wan
The LTM4601 DC/DC μModule regulator is a completehigh power density stepdown regulator for up to 12Acontinuous (14A peak) loads. The device is housed ina small 15mm ¥ 15mm ¥ 2.8mm LGA surface mountpackage, thus the large power dissipation is a challengein some applications. This thermal application note willprovide guidelines for using the μModule regulator inambient environments with or without air fl ow. Loadcurrent derating curves are provided for several inputvoltages and output voltages versus ambient temperatureand air fl ow.
上傳時(shí)間： 2013-10-19
上傳用戶：bakdesec
當(dāng)前，太陽(yáng)能光伏市場(chǎng)(包括光伏模塊和逆變器)正以每年約30%的年累積速 度增長(zhǎng)。太陽(yáng)能逆變器的作用是將隨太陽(yáng)能輻射及光照變化的DC 電壓轉(zhuǎn)換成為 電網(wǎng)兼容的AC 輸出；而對(duì)于廣大電子工程師而言，太陽(yáng)能逆變器是一個(gè)值得高 度關(guān)注的技術(shù)領(lǐng)域。因此下文將介紹太陽(yáng)能逆變器設(shè)計(jì)所需注意的技術(shù)要點(diǎn)、挑 戰(zhàn)以及相應(yīng)的解決方法。 基本設(shè)計(jì)標(biāo)準(zhǔn) 基于太陽(yáng)能逆變器的專用性以及保持設(shè)計(jì)的高效率，它需要持續(xù)監(jiān)視太陽(yáng)能 電池板陣列的電壓和電流，從而了解太陽(yáng)能電池板陣列的瞬時(shí)輸出功率。它還需 要一個(gè)電流控制的反饋環(huán)，用于確保太陽(yáng)能電池板陣列工作在最大輸出功率點(diǎn)， 以應(yīng)付多變的高輸入。目前，太陽(yáng)能逆變器已有多種拓?fù)浣Y(jié)構(gòu)，最常見(jiàn)的是用于 單相的半橋、全橋和Heric(Sunways 專利)逆變器，以及用于三相的六脈沖橋和 中點(diǎn)鉗位（NPC）逆變器；圖1 所示是這些逆變器的拓?fù)鋱D(Microsemi 圖源)。 同時(shí)，設(shè)計(jì)還需遵從安全規(guī)范，并在電網(wǎng)發(fā)生故障的時(shí)候可以快速斷開(kāi)與電網(wǎng)的 連接。因此，太陽(yáng)能逆變器的基本設(shè)計(jì)標(biāo)準(zhǔn)包括額定電壓、容量、效率、電池能 效、輸出AC 電源質(zhì)量、最大功率點(diǎn)跟蹤（MPPT）效能、通信特性和安全性
標(biāo)簽： 太陽(yáng)能逆變器
上傳時(shí)間： 2014-12-24
上傳用戶：三人用菜
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：lliuhhui
When a system designer specifies a nonisolated dc/dc powermodule, considering the needed input voltage range isequally as important as considering the required performanceattributes and features. Generally, nonisolated moduleshave either a narrow or a wide input voltage range. Narrowinputmodules typically have a nominal input voltage of3.3, 5, or 12 V. For systems that operate from a tightlyregulated input bus—such as those that do not use batterybackup—a narrow-input module is often adequate sincethe input remains fairly stable.Offering greater flexibility, wide-input modules operatewithin a range of 7 to 36 V, which includes the popular12- or 24-V industrial bus. This enables a single module tobe used for generating multiple voltages. These modulesare ideal for industrial controls, HVAC systems, vehicles,medical instrumentation, and other applications that usea loosely regulated distribution bus. In addition, systemspowered by a rectifier/battery charger with lead-acidbattery backup almost always require wide-input modules.System designers who choose power supplies may wantto take a close look at the latest generation of wide-inputdc/dc modules.
標(biāo)簽： Wide-input modules offer dc
上傳時(shí)間： 2014-12-24
上傳用戶：dragonhaixm
簡(jiǎn)介采用模數(shù)轉(zhuǎn)換器(ADC)的現(xiàn)代電子系統(tǒng)要求更低功耗和更高性能。本文描述了采用線性電源和開(kāi)關(guān)電源之間的差異，并論證了將高效DC-DC轉(zhuǎn)換器和高性能模數(shù)轉(zhuǎn)換器組合使用，可以顯著降低系統(tǒng)功耗，同時(shí)不降低模數(shù)轉(zhuǎn)換器的性能。
標(biāo)簽： 開(kāi)關(guān)電源 供電 高速模數(shù)轉(zhuǎn)換器
上傳時(shí)間： 2013-10-27
上傳用戶：哈哈hah
加利福尼亞州米爾皮塔斯 (MILPITAS, CA) – 2009 年 8 月 31 日 – 凌力爾特公司 (Linear Technology Corporation) 推出隔離式 RS485 微型模塊 (uModule®) 收發(fā)器 LTM2881，該器件針對(duì)大的地至地差分電壓和共模瞬變提供了保護(hù)作用。在實(shí)際的 RS485系統(tǒng)中，各節(jié)點(diǎn)之間的地電位差異很大，常常超出可容許范圍，這有可能導(dǎo)致通信中斷或收發(fā)器受損。LTM2881 運(yùn)用內(nèi)部感應(yīng)信號(hào)隔離來(lái)對(duì)邏輯電平接口和線路收發(fā)器實(shí)施隔離，以中斷接地環(huán)路，從而實(shí)現(xiàn)了大得多的共模電壓范圍和 >30kV/μs 的卓越共模抑制性能。一個(gè)低 EMI DC-DC 轉(zhuǎn)換器負(fù)責(zé)向收發(fā)器供電，并提供了一個(gè)用于給任何外部支持元件供電的 5V 隔離電源輸出。憑借 2,500VRMS 的電流隔離、板上輔助電源和一個(gè)完全符合標(biāo)準(zhǔn)的 RS485 發(fā)送器和接收器，LTM2881 不需要使用外部元件，從而確保了一款適合隔離串行數(shù)據(jù)通信的完整、小型μModule 解決方案。
上傳時(shí)間： 2013-10-25
上傳用戶：ljj722
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