電源/新能源
提供權(quán)威的電源和新能源設(shè)計(jì)及電源管理資訊，內(nèi)容有醫(yī)療/工業(yè)電源、LED驅(qū)動(dòng)、數(shù)字電源、電池技術(shù)、太陽能光伏等電源技術(shù)方案，包括電源測(cè)試/仿真/認(rèn)證、便攜電源、電動(dòng)車/新能源、AC-DC與DC-DC轉(zhuǎn)換、基準(zhǔn)/監(jiān)控/保護(hù)電路等專業(yè)領(lǐng)域。
由USB端口便攜式供應(yīng)產(chǎn)生5 V和+3.3 V電源由USB端
Abstract: A portable device using the circuit of Figure 1 derives power from the USB bus. The MAX1811 uses USB power charges a lithium-ion (Li+) battery at, USB compatible, 100mA or 500mA rates. Battery power is then stepped up with the MA...
2009-04-30 標(biāo)簽：USB端口 1672
新增電流刺激驅(qū)動(dòng)的USB接口充電器AC適配器-Add Cur
Abstract: A USB interface is capable of charging a portable device while transferring data. But for high-capacity batteries, the limited output current of USB hosts and hubs greatly extends the charging time. Powered USB hubs and USB hosts...
用DS2711/12檢測(cè)原電池
摘要：DS2711和DS2712標(biāo)準(zhǔn)NiMH電池充電器(專為1節(jié)或2節(jié)AA或AAA NiMH“標(biāo)準(zhǔn)”電池設(shè)計(jì))能夠檢測(cè)原電池(一次電池，不可充電電池)，避免對(duì)其充電。本應(yīng)用筆記介紹了各種來自不同廠商的電...
2009-04-30 標(biāo)簽：DS2711 1287
可充電電池：原理，隱患，及安全充電方法
摘要：本文概要介紹了電池充電方式和現(xiàn)代電池技術(shù)，以使讀者能更好的了解便攜設(shè)備中使用的電池。本文對(duì)鎳鎘(NiCd)電池，鎳氫(NiMH)電池和鋰離子(Li+)電池的化學(xué)性質(zhì)進(jìn)行了描述，...
2009-04-30 標(biāo)簽：充電電池 2624
提高M(jìn)AX1737鋰離子電池充電器的精度-Improving
Abstract: This application note describes how to improve full-scale current-sense and charge-termination accuracy of the MAX1737 lithium-ion (Li+) battery charger. The MAX1737 current-sense is more accurate than stated in the data sheet, b...
2009-04-30 標(biāo)簽：MAX1737 1919
nMOS晶體管與DS2714的配合使用
摘要：DS2714獨(dú)立式NiMH電池充電器的數(shù)據(jù)資料中提供了一個(gè)使用pnp晶體管的應(yīng)用電路，利用pnp晶體管對(duì)充電電流進(jìn)行開、關(guān)控制。這種方式可能存在某些問題，因?yàn)槌潆娍刂埔_的電...
2009-04-30 標(biāo)簽：晶體管 1596
充電電池和單機(jī)快速充電器概述
摘要：本應(yīng)用筆記簡(jiǎn)單介紹了鎳鎘(NiCd)、鎳氫(NiMH)和鋰離子(Li-Ion，Li+)可充電電池, 討論它們的性能，并說明在不需要微控制器的情況下如何構(gòu)建單機(jī)結(jié)構(gòu)，安全、快速地為鎳氫和鋰...
2009-04-30 標(biāo)簽：充電電池 1229
鋰離子電池充電運(yùn)行的安全問題減少-Understanding
Abstract: Due to the high energy/power density, in relation to the weight and volume of Lithium-ion (Li+) battery technology, there are some lingering safety concerns when charging and discharging the batteries. Although an already mature ...
2009-04-30 標(biāo)簽： 1864
簡(jiǎn)化1節(jié)Li+電池供電設(shè)備的設(shè)計(jì)
摘要：MAX8671X電源管理IC (PMIC)能夠?yàn)楸銛y系統(tǒng)設(shè)計(jì)提供鋰電池充電及電源穩(wěn)壓，該器件可利用USB端口或外部AC-DC電源適配器作為輸入電源為鋰離子(Li+)、鋰聚合物(Li-Poly)電池充電。PMIC...
2009-04-30 標(biāo)簽：供電設(shè)備 929
估算DS2715 NiMH電池充電器的開關(guān)速度
摘要：DS2715電池充電器的開關(guān)速度因充電模式、電感選擇和電池電壓而有所不同。某些情況下，需要了解各種條件下的開關(guān)速度,以解決噪聲靈敏度、峰值充電電流和電感選擇限制等...
2009-04-30 標(biāo)簽：DS2715 1497
估算DS2712 NiMH電池充電器的開關(guān)速度
摘要：開關(guān)模式下，DS2712電池充電器的開關(guān)速度因電感選擇、充電電流和電池電壓而有所不同。某些情況下，需要了解各種條件下的開關(guān)速度，以解決噪聲靈敏度、峰值充電電流和...
2009-04-30 標(biāo)簽：DS2712 1437
簡(jiǎn)化鋰離子(Li+)電池充電器測(cè)試
摘要：由于Li+電池充電器的充電過程會(huì)持續(xù)一個(gè)小時(shí)甚至更長(zhǎng)的時(shí)間，利用實(shí)際負(fù)載(即電池)對(duì)充電器進(jìn)行測(cè)試將非常耗時(shí)。本應(yīng)用筆記介紹了一種簡(jiǎn)單的Li+電池仿真方法，與采用實(shí)...
2009-04-30 標(biāo)簽： 991
Step-Up Supply Charges Battery
The circuit of Figure 1 supports the many portable applications in which a microprocessor (µP) or microcontroller (µC) controls charging of the battery. IC1 is a step-up switching regulator that boosts VIN (nominally 5V) as nec...
Dual Boost Regulator Handles H
Among 2-cell boost regulators, five watts (5V at 1A) is "high power." But, obtaining even 5W from a 2-cell or 3-cell battery is not a trivial problem. Peak currents exceed 2A, and the small voltage drops they produce in the power devices, ...
穩(wěn)壓電荷泵提供50毫安-Regulated Charge P
The DC-DC converter circuit of Figure 1 substitutes a voltage tripler in place of the external inductor and diode normally associated with switching regulator IC1. Inverting and noninverting drivers in the MOSFET-driver chip (IC2) activate...
2009-04-30 標(biāo)簽：電荷 1099
能源管理的小型便攜式系統(tǒng)-Energy Management
Numerous diverse and conflicting constraints burden the designer of small hand-held products. Aside from the customary restrictions on size and weight, these constraints include cost limitations, strict time schedules, battery-life goals m...
2009-04-30 標(biāo)簽：能源管理 3226
新發(fā)展的電池充電器-New Developments in
Electronic equipment is increasingly becoming smaller, lighter, and more functional, thanks to the push of technological advancements and the pull from customer demand. The result of these demands has been rapid advances in battery technol...
2009-04-30 標(biāo)簽： 1807
Dual-Voltage Supply Powers SIM
Global-system-for-mobile-communication phones have a subscriber-identification module (SIM) that allows local wireless providers to recognize the user and his or her billing information. Although most SIMs are changing to 3V operation, the...
2009-04-30 標(biāo)簽：Dual-Volta 867
簡(jiǎn)單的電路斷開負(fù)載-Simple Circuit Disco
Placing a load-disconnect circuit on the output of a bootstrapped step-up regulator allows the regulator to start with load currents much higher than would otherwise be possible (Figure 1). During shutdown, the disconnect completely isolat...
2009-04-30 標(biāo)簽：負(fù)載 1293
Push-Pull Driver Provides Isol
The circuit in Figure 1 converts a regulated 5V input to an isolated 5V output with 1A current-output capability. IC1, a push-pull transformer driver, powers a pair of cross-coupled power MOSFETs in a flip-flop-like configuration. In turn,...
2009-04-30 標(biāo)簽：driver 2244
CPU核心供電-Powering Portable CPU
Providing electrical power for CPUs and other high-density logic has never been easy, though it appeared for awhile that technology would eventually reduce the power needed for computing tasks. Although technology advances have been rapid,...
2009-04-30 標(biāo)簽：cpu 1385
A Smart Solid-State Fuse Cures
The majority of asynchronous, inductor-based boost converters (the step-up switching types) exhibit a DC-current path between power source and load (Figure 1). This path can have two undesirable consequences: First, if a grounded output or...
2009-04-30 標(biāo)簽：Converter 1508
電路折衷降低噪音電池輸入電源-Circuit Tradeof
Analyzing noise from the perspective of portable-system design will help you in making appropriate trade-off in power-supply design. RF-communicating computers and other new mobile systems can act as portable generators of unwanted...
2009-04-30 標(biāo)簽：circuit 1865
反饋分離增強(qiáng)供電的安全和性能-Feedback Isolat
Isolated power supplies have been around since the beginning of the electronics industry. As power-supply designs change to keep pace with increased efficiency and power-density demands, isolated feedback is crucial to maintaining safety....
2009-04-30 標(biāo)簽：反饋分離 1136
Proper Handling Helps Make the
Abstract: Li-ion batteries pack the most power per unit volume, but excessive charging or discharging can damage or destroy the battery and its surroundings. Carefully designed circuits can help you avoid such dire consequences. ...
2009-04-29 標(biāo)簽：Batteries 1554
Power Efficiency in Next-Gener
The need for ultra-low on-resistance and low switching losses can make notebook MOSFET choice difficult. Nonetheless, MOSFET characteristics dominate DC-DC power conversion efficiency. This is critical for notebook CPUs due out in 1999....
2009-04-29 標(biāo)簽：MOSFET 1410
Synchronous Rectification Aids
Synchronous rectifiers can improve switching-power-supply efficiency, particularly in low-voltage low-power applications. This article compares synchronous rectifiers to Schottky-diode types and illustrates some circuit tricks useful in th...
2009-04-29 標(biāo)簽：Low-Voltag 2203
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