共查询到20条相似文献,搜索用时 171 毫秒
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Tom Fowler 《电子产品世界》2006,(F04):47-49
通用串行总线(USB)端口是一种带有电源和地的双向数据端口。USB可以连接所有类型的外围设备,包括外部驱动器、存储设备、键盘、鼠标、无线接口、摄像机和照相机、MP3播放器以及数不尽的各种电子设备。这些设备有许多采用电池供电.其中一些带有内置电池。对于电池充电设计来说.应用广泛的USB既带来了机遇.也带来了挑战。本文阐述了如何将一个简单的电池充电器与USB电源进行接口。 相似文献
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电源管理集成电路开发商研诺逻辑科技有限公司,1月14口宣布推出产品编号为AAT3691的一款内置了高达28V过压保护的双输入电池充电器芯片。为满足业界对多电源电池充电的高灵活性和稳定性要求而设计,该款新犁电池充电器支持诸如手机、数码相机以及其他手持设备应用中交流电(AC)适配器和USB接口两种输入。该充电器可对哪种输入源提供最短的充电时间进行智能评估,并修订充电路径,同时内置的过压保护(OVP)可避免电池和系统的错误输入。 相似文献
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引言在GPS导航装置、PDA、数码相机、照片浏览器和MP3播放机等手持式设备中提供USB和高输入电压电源以及电池充电能力可具有诸多优点。例如,利用USB来提供充电和工作电源带来的明显便利就是不再需要随身携带旅行充电器。高电压电源(比如:FireWire和12V至24V适配器)就更好了,因为它们能够提供比USB更快的充电速度,并允许在更多的场所(比如:汽车内)进行充电。然而,在采用高电压电源时有一个重要的设计考虑,这就是高电压电源和手持式设备中的电池之间存在著非常大电压差。由于线性充电器不能处理功率耗散,因而需要使用开关充电器。LT… 相似文献
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JOHN HERRMANN 《今日电子》2003,(2)
充电技术镉镍电池的充电器根据其技术完善程度可以分成很多种类,最简单的一种莫过于慢速充电器了,这种充电器一般是一个输出电压固定的直流变压器,充电电流的大小取决于变压器内阻或者外加电阻的大小。慢速充电对于镍氢电池或镍镉电池是不利的,因为充电过程中不断产生的热量会加速电池老化。廉价的慢速充电器一般不会对充电电流进行很好地滤波,因此对电池的损害要严重许多。专为镍氢电池和镍镉电池优化设计的快速充电器在技术上要复杂得多,这种充电器一般设计有电流调节器、限压保护电路和充电控制电路。充电控制电路能根据电池的温度… 相似文献
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一种单片机控制的铅酸蓄电池充电电源 总被引:1,自引:0,他引:1
为了有效地提升铅酸蓄电池的使用寿命,同时实现对充电过程的监控,设计出一种用单片机控制的36 V铅酸蓄电池充电电源。本电路采用反激式拓扑,连续电流工作模式,电源管理IC设计在电源的副边,由ELAN公司的EM78P258N单片机模拟,是用可编程器件模拟电源管理IC,实现智能电源低成本化的一次成功尝试,通过对单片机的软件设计实现了充电电源的状态显示、充电时间控制、报警、过温保护、过压保护、过流保护等功能。本充电器真正的实现了铅酸蓄电池的三段式充电过程,其最高输出功率可达90 W,效率约85%,成本不到20元,具有很高的市场竞争力。 相似文献
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恒流-恒压模式控制的锂电池充电器的设计 总被引:1,自引:0,他引:1
设计了一款恒流-恒压充电模式控制的锂离子电池充电器,当电池电压低于2.9 V时,充电器提供涓流充电模式;当电池电压高于2.9 V时,充电器提供恒流充电模式;当电池电压达到4.2 V时,实现恒压充电模式对充电器的控制,充电电流减小。对主要子模块的电路进行了详细的设计与仿真并进行了稳定性分析,均能够在不采用任何补偿的情况下保持稳定。电路采用CSMC公司的0.6μm B iCMOS工艺模型,基于Cadence仿真平台对电路进行了前仿真,仿真结果表明,在5 V电源电压下,涓流充电电流为50 mA,恒流充电电流为502 mA,最终电池电压为4.202 V。 相似文献
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Hwang Y.-S. Wang S.-C. Yang F.-C. Chen J.-J. 《IEEE transactions on circuits and systems. I, Regular papers》2007,54(4):705-712
This paper presents a new compact CMOS Li-Ion battery charger for portable applications that uses a charge-pump technique. The proposed charger features a small chip size and a simple circuit structure. Additionally, it provides basic functions with voltage/current detection, end-of-charge detection, and charging speed control. The charger operates in dual-mode and is supported in the trickle/large constant-current mode to constant-voltage mode with different charging rates. This charger is implemented using a TSMC 0.35-mum CMOS process with a 5-V power supply. The output voltage is almost 4.2 V, and the maximum charging current reaches 700 mA. It has 67.89% power efficiency, 837-mW chip power dissipation, and only 1.455times1.348 mm2 in chip area including pads 相似文献
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基于模糊控制的镍氢电池充电器 总被引:1,自引:0,他引:1
文中设计了一款智能快速充电器。采用模糊控制原理进行蓄电池的充电控制,确定了模糊控制器的结构和算法,进行了双输入单输出模糊控制器的设计。该充电器以单片机为核心,运用开关电源技术,采用恒流脉冲充电与模糊控制相结合的充电方法,在保证蓄电池循环寿命不受损害的前提下,大大提高了充电速度。 相似文献
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《Industrial Electronics, IEEE Transactions on》2009,56(7):2469-2478
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Chiang S.J. Hsin-Jang Shieh Ming-Chieh Chen 《Industrial Electronics, IEEE Transactions on》2009,56(11):4344-4353
The photovoltaic (PV) stand-alone system requires a battery charger for energy storage. This paper presents the modeling and controller design of the PV charger system implemented with the single-ended primary inductance converter (SEPIC). The designed SEPIC employs the peak-current-mode control with the current command generated from the input PV voltage regulating loop, where the voltage command is determined by both the PV module maximum power point tracking (MPPT) control loop and the battery charging loop. The control objective is to balance the power flow from the PV module to the battery and the load such that the PV power is utilized effectively and the battery is charged with three charging stages. This paper gives a detailed modeling of the SEPIC with the PV module input and peak-current-mode control first. Accordingly, the PV voltage controller, as well as the adaptive MPPT controller, is designed. An 80-W prototype system is built. The effectiveness of the proposed methods is proved with some simulation and experimental results. 相似文献
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Jin-Ha Choi Jung-Min Kwon Jee-Hoon Jung Bong-Hwan Kwon 《Industrial Electronics, IEEE Transactions on》2005,52(3):889-897
A high-performance single-phase online uninterruptible power supply (UPS) is proposed. The UPS is composed of a three-leg-type converter which operates as a battery charger and an inverter. The first leg is controlled to charge the battery, and the third leg is controlled to make the output voltage. The common leg is controlled in line frequency. The charger and the inverter are controlled independently. The charger has the capability of power-factor correction while charging a battery. The inverter regulates output voltage and limits output current under an impulsive load. The three-leg-type converter reduces the number of switching devices. As a result, the system has less power loss and a low-cost structure. In the determination of the charger voltage, the nominal voltage is derived using the feedback linearization concept and then a perturbed voltage is determined for the reactive power control. The disturbance of input voltage is detected using a fast sensing technique of the input voltage. Experimental results obtained with a 3-VA prototype show a normal efficiency of over 87% and an input power factor of over 99%. 相似文献