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Terry Cleveland Scott Dearbom 《电子设计应用》2006,(7):99-101
引言随着电池供电的电子设备越来越流行并且功能越来越强大,对电池充电器设计提出了更高的要求。只需采用标准元器件,电池充电器设计就可以同时具有灵活性和质优价廉两方面的优点。混合信号设计能够更方便地为系统增加新的特殊功能。本文主要讨论两种最常见的化学电池:锂离子电 相似文献
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基于模糊控制的锂离子电池充电器 总被引:1,自引:0,他引:1
设计了一种以MC68HC05SR3单片机为核心,基于模糊控制的脉冲式锂离子电池充电器.通过模糊控制器实时调节PWM的占空比来控制充电电压和电流,较为有效的解决了PWM波的纹波、浪涌等方面存在的缺陷,提高了充电精度,确保充电过程的高效安全性. 相似文献
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采用CSMC 0.6μm 2P2M CMOS工艺设计并实现了一种新型可用于智能光模块的可变阈值信号丢失(LOS)检测电路,电路利用光接收机中的限幅放大器组成准对数律接收信号强度指示电路.该指示电路与迟滞比较器、基准参考源、运算放大器和两个外部调节电阻组成了可变报警阈值的LOS检测电路.整个电路工作于5V单电源供电,功耗为60mW.测试结果表明,对于155Mbps的输入信号,信号检测的动态范围高达60dB,对数精度小于2dB.可变报警阈值范围为1~700mV,同时保证报警迟滞宽度为4dB左右.良好的性能预示了该电路潜在的商业前景. 相似文献
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采用CSMC 0.6μm 2P2M CMOS工艺设计并实现了一种新型可用于智能光模块的可变阈值信号丢失(LOS)检测电路,电路利用光接收机中的限幅放大器组成准对数律接收信号强度指示电路.该指示电路与迟滞比较器、基准参考源、运算放大器和两个外部调节电阻组成了可变报警阈值的LOS检测电路.整个电路工作于5V单电源供电,功耗为60mW.测试结果表明,对于155Mbps的输入信号,信号检测的动态范围高达60dB,对数精度小于2dB.可变报警阈值范围为1~700mV,同时保证报警迟滞宽度为4dB左右.良好的性能预示了该电路潜在的商业前景. 相似文献
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锂离子充电电池使用过程中,过充电、过放电和过电流都将会影响电池使用寿命和性能及安全,充电电池中熔断器作为二级过流保护配合IC控制环路有效监测并防止对电池产生损害。 相似文献
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Liang-Rui Chen 《Industrial Electronics, IEEE Transactions on》2004,51(6):1344-1346
In this paper, a phase-locked battery charger (PLBC) is proposed to show that a phase-locked loop (PLL) is a perfect circuit topology for battery charging. The circuit topology of the PLBC is almost the same as that of the PLL and it inherits the merits of the PLL, such as autotracking, autolocking, and high accuracy. A complete charging process, consisting of three subprocesses: constant current charge, variable current charge, and float charge, can be automatically implemented by using the above inherent characteristics of the PLL. Experimental results show that the PLL is really suitable for carrying out a battery charge controller. 相似文献
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《Optical Fiber Technology》2013,19(2):185-188
An optical-and-electrical hybrid scheme for improving on–off keying (OOK) signals is described. It is a feed-forward (FF) control circuit composed of an optical coupler, a photo-detector, and an electro-absorption (EA) modulator, which works to suppress “on” level fluctuations. Owing to the use of an EA modulator, the circuit operates irrespective of the polarization state of the input signal. In addition, the scheme can also improve the extinction ratio (ER) of OOK signals. Experiments were conducted to demonstrate the noise suppression and the ER improvement. 相似文献
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锂离子电池及其保护电路 总被引:5,自引:0,他引:5
在便携式电子产品的电源发展中, 电池无疑是电力来源的唯一选择。而基于环保与重复使用的考虑,对二次电池的需求与日俱增。其中锂离子电池的异军突起,造成了二次电池市场的重新洗牌。紧接而来的锂高分子电池以及锂金属电池,无非是对便携式产品电力效能的进一步提高,发挥其最大的贡献。 二次电池的便携式产品应用范围包括业务用终端机、导航系统、随身听、数字相机、摄录一体机、数字个人助理、电动车辆、移动电话以及笔记本电脑等。其中,锂离子电池最大的应用领域为笔记本电脑与移动电话,其占有率己分别在80%与60%以上。而根据… 相似文献
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《Solid-State Circuits, IEEE Journal of》1987,22(6):1082-1090
A general-purpose gain/loss circuit is described. Its function is controlled by an 8-b digital word. It provides up to 256 0.1-dB steps in gain or loss. The circuit has two modes of incremental gain/loss steps (two sets of gain/loss values for bits in the control word). A ninth bit selects between gain and loss. The IC has three digital interfaces: serial, parallel clocked input, and parallel fixed input. The chip is fabricated in a 3-/spl mu/m CMOS n-well process. It requires a /spl plusmn/5-V power supply, and for maximum gain of 25.5 dB, the 0.1-dB large-signal bandwidth is 260 kHz. 相似文献
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本文介绍了DW01芯片的结构以及工作原理,并给出了单节锂电池的双重保护电路设计,该电路具有体积小巧、保护灵敏等特点。 相似文献
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Stamenkovic Z. Stojadinovic N. Dimitrijev S. 《Semiconductor Manufacturing, IEEE Transactions on》1996,9(2):270-272
A yield model suited for application in a yield control system and based on in-line inspections of control wafers containing the corresponding test structures has been proposed. It is shown that the proposed yield model and yield control system can be used for modeling yield loss mechanisms and predicting efficient investments which are required in order to ensure a competitive yield of integrated circuits. An approach for the extraction of chip critical areas associated with the corresponding yield loss mechanism has been described 相似文献