一种新型的锂离子电池开关充电电路

设计了一种新型的基于恒流/恒压充电模式的锂离子电池开关充电电路。在电池电压达到浮充电压时,实现了恒流充电向恒压充电的平滑切换。通过对恒流充电环路和恒压充电环路的设计,尤其是对充电电流采样信号放大电路和电池电压采样信号放大电路的详细设计,实现了电路的稳定工作。采用0.5 μm标准CMOS工艺对电路进行仿真,结果表明,电路工作在5 V的电源电压下,涓流充电电流为119.6 mA,恒流充电电流为1.209 A,恒压充电阶段的电池电压为4.195 V,并且实现了恒流充电向恒压充电的平滑切换。     

一种基于复合运放的线性锂离子电池充电器

基于复合运放,设计了一款新颖的线性锂离子电池充电器.该充电器根据锂离子电池充电的特性,采用三阶段充电法,即涓流充电(预处理),恒流充电(快充),恒压充电(充满).仿真结果显示,在4.5 V电源电压下,充电器实现了涓流充电电流80 mA,恒流充电电流800 mA,及恒定电压4.2 V的充电过程.另外,设计中利用充电功率管的栅极寄生电容作为充电环路的补偿电容,节省了芯片成本和面积.     

恒流/恒压充电方式的锂电池充电器芯片

提出了一种基于恒流-恒压(CC-CV)充电模式的锂电池充电器.在CC-CV充电模式下,充电器先给电池提供大的充电电流;在电池电压尚未到达饱和之前,充电电流便开始减小;电池电压达到饱和并保持恒定之后,充电电流进一步减小.这种充电方法,能够避免在电池电压的饱和值附近仍对电池进行大电流充电,从而导致过热现象.对这块充电器芯片核心电路的创新设计,保证了这种CC-CV充电模式的实现.本芯片采用CSMC公司0.6μm的CMOS工艺流片.测试结果验证了本文提出的CC-CV充电模式的实现.充电完成后,锂电池电压为4.1833V.     

恒流/恒压充电方式的锂电池充电器芯片

提出了一种基于恒流-恒压(CC-CV)充电模式的锂电池充电器.在CC-CV充电模式下,充电器先给电池提供大的充电电流;在电池电压尚未到达饱和之前,充电电流便开始减小;电池电压达到饱和并保持恒定之后,充电电流进一步减小.这种充电方法,能够避免在电池电压的饱和值附近仍对电池进行大电流充电,从而导致过热现象.对这块充电器芯片核心电路的创新设计,保证了这种CC-CV充电模式的实现.本芯片采用CSMC公司0.6μm的CMOS工艺流片.测试结果验证了本文提出的CC-CV充电模式的实现.充电完成后,锂电池电压为4.1833V.     

正确使用镍镉可充电电池

本次的Freescale车模大赛中,国产镍镉可充电电池被选为动力车的电源。单个镍镉电池只能提供1.2V的供电电压。这次比赛所使用的电池是用6节相同型号的电池串连起来从而得到7.2V的电池组,其标称容量为2000mAh,也就是说,该电池组可以在2A的供电电流下持续供电1小时。以下是可充电镍镉电池使用中的注意事项,提醒参赛者注意。正确充电推荐使用比赛选配的充电器。该充电器是为玩具电池设计的廉价充电器,内部没有智能充电控制电路,只能采用恒功率充电模式,最大充电电流为700mA,平均充电电流300mA,涓流充电电流小于100mA,充电时间约为10小时。当…     

线性锂离子电池充电器的分析和设计

设计了一种独立的单节锂离子电池线性充电器,该充电器采用恒定电流/恒定电压算法,可输出高达1 A的可编程充电电流和精度达±0.35%的4.2 V终止充电电压.详细分析了恒流充电实现的原理和恒压充电实现的原理.使用XFAB 0.6 μm BiCMOS工艺模型,Spectre仿真结果表明,在恒流充电到恒压充电的整个过程中系统都稳定工作且性能符合设计指标.     

基于TPS5430和MAX1674的智能充电器

太阳能电池板的便携式充电器是解决通信设备、田间测量仪器等移动式电子产品供电问题的最佳解决方案之一.采用TPS5430降压电路和MAX1674升压电路,由LM393、ICL7660等元件构成的切换电路为控制核心,设计具有自启动功能的电能收集充电器.充电器能够根据充电电压的不同,自动切换到不同的DC-DC变换电路,实现高效、快速充电.测试表明,当充电电源内阻Rs为100 Ω,充电电压Es在10～20 V范围内,充电电池电动势Ec为3.6 V、内阻Rc为0.1 Ω时,充电电流Ic＞58 mA,自动启动充电电压为3.6 V,电池放电电流为3 mA;而当充电电源内阻Rs为1 Ω,充电电压Es在1.2～3.6 V范围内时,最大充电电流可达256 mA.     

便携式仪器需要高性能充电器

近几年来,电池技术有了长 足的发展,其中锂离子和锂聚合物电池最为流行。为了使这些电池获得最佳性能,充电器技术必须跟上电池技术的发展。 笔记本电脑所使用的电池,无论大小、重量还是寿命都很关键。由于锂离子和锂聚合物相似,所以它们的充电方式几乎相同,主要区别在于端电压和充电电流。 锂离子电池的传统充电方式是采用恒流和恒压。当电池的电压较低时,典型的充电周期开始是用恒流充电方式。当电池电压上升到指定限度时,充电器转为恒压充电,该方式一直持续到充电电流减小为零,这时电池充电完毕。在恒压充电阶段,电流按指数规…     

电源技术

带有同步600mA降压转换器的电池充电器凌特针对手持应用推出LTC3550-1电源管理解决方案。该线性电池充电器可以自动选择合适的电源,通过交流适配器或USB端口对单节锂离子电池进行有效的充电。其独立运行模式能够简化设计,无需为充电终止而加设外置微处理器。该充电器采用一种恒流/恒压算法,利用交流适配器电源或USB电源分别可提供高达950mA或500mA的充电电流。不论在哪种情况下,最终     

2A的恒流/恒压电池充电芯片LT1769

LT1769是线性器件公司生产的一种恒流/恒压电池充电芯片.它可以由电阻或者DAC的输出来设置充电电流,并且可以自动检测电池充电情况,当电池充电到一定程度时,可降低充电电流而进入涓流充电.本文详细介绍了该芯片的内部结构原理以及应用设计.     

An omnipotent Li–ion battery charger with multimode control and polarity reversible techniques

The omnipotent Li–ion battery charger with multimode control and polarity reversible techniques is presented in this article. The proposed chip is fabricated with TSMC 0.35μm 2P4M complementary metal-oxide- semiconductor processes, and the chip area including pads is 1.5 × 1.5 mm². The structure of the omnipotent charger combines three charging modes and polarity reversible techniques, which adapt to any Li–ion batteries. The three reversible Li–ion battery charging modes, including trickle-current charging, large-current charging and constant-voltage charging, can charge in matching polarities or opposite polarities. The proposed circuit has a maximum charging current of 300 mA and the input voltage of the proposed circuit is set to 4.5 V. The maximum efficiency of the proposed charger is about 91% and its average efficiency is 74.8%. The omnipotent charger can precisely provide the charging current to the battery.     

New Compact CMOS Li-Ion Battery Charger Using Charge-Pump Technique for Portable Applications

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     

Multi-load constant current charging technology for wireless charging system

ABSTRACT

In wireless charging system, limited by the coupling effect between the loads and the change of the equivalent impedance of the battery, it becomes difficult to provide efficient and stable energy supply for multiple load devices. In this paper, a multi-load constant current charging technology for wireless charging system is proposed, which combines the primary side control and the secondary side control to achieve quick charge for multiple load batteries at the same time. The system reduces the influence of interference factors by designing the primary side control module and the transmission structure, to ensure sufficient and stable transmission of energy. And utilising the secondary side control module to charge the battery with constant current, which increases the charging speed, and reduces the impact of battery impedance changes on the system’s transmission state. It is verified by experiments that when charging four 1.2 V Ni-MH batteries, the receiver at different positions within the coverage of the transmitting coil can achieve 100mA constant current charging for the battery and the output voltage fluctuation range of each receiver is within 0.2 V, and the working efficiency of the system can reach 70%.     

Dual-bridge LLC-SRC with extended voltage range for deeply depleted PEV battery charging

This paper proposes a dual-bridge LLC series resonant converter with hybrid-rectifier for achieving extended charging voltage range of 50–420 V for on-board battery charger of plug-in electric vehicle for normal and deeply depleted battery charging. Depending upon the configuration of primary switching network and secondary rectifier, the proposed topology has three operating modes as half-bridge with bridge rectifier (HBBR), full-bridge with bridge rectifier (FBBR) and full-bridge with voltage doubler (FBVD). HBBR, FBBR and FBVD operating modes of converter achieve 50–125, 125–250 and 250–420 V voltage ranges, respectively. For voltage above 62 V, the converter operates below resonance frequency zero voltage switching region with narrow switching frequency range for soft commutation of secondary diodes and low turn-off current of MOSFETs to reduce switching losses. The proposed converter is simulated using MATLAB Simulink and a 1.5 kW laboratory prototype is also built to validate the operation of proposed topology. Simulation and experimental results show that the converter meets all the charging requirements for deeply depleted to fully charged battery using constant current-constant voltage charging method with fixed 400 V DC input and achieves 96.22% peak efficiency.     

LED恒流驱动电路研究与设计

基于CSMC 0.5μm BCD工艺给出LED恒流驱动电路.利用MOS管饱和区恒流特性以及电流负反馈结构,给出三种恒流驱动方案.比较三种方案的恒流工作电压,确立最终结构.采用的方案能够有效降低恒流工作电压并实现利用外接电阻控制恒流输出的大小,驱动电流范围为14.5mA到91.5mA.驱动电流可以通过外接PWM数字信号实现输出使能控制,控制响应时间为7ns.可用于LED显示屏.通过Hspice软件进行仿真,5V的电源电压波动±10%时驱动电流波动小于1.85%.环境温度由25℃变化到85℃时驱动电流变化2.14%.外接电压由0V变化到5V,此时的驱动电流变化小于5.5%.当驱动电流为91.5mA时,恒流工作电压仅为0.38V.     

Modeling and Control of PV Charger System With SEPIC Converter

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.     

基于可中断恒流-恒压方法的锂电池充电控制器

为提高锂电池充电的效率,延长电池寿命,提出一种新的基于可中断恒流-恒压控制方法的锂电池充电管理芯片的设计,并针对充电的安全性问题,加入了电池工作温度异常中断机制,可在电池温度过高或者过低时有效保护电池,还可使用户根据典型(而不是最差条件下的)环境温度来设置充电电流,提高了充电效率。提出的新型恒流-恒压控制电路具有结构简单、控制精度高的优点。芯片采用1.5μm BCD的工艺进行了设计和流片。测试结果成功验证了所提出的控制策略及芯片的功能。     

A Wireless Power Interface for Rechargeable Battery Operated Medical Implants

This brief presents a highly integrated wirelessly powered battery charging circuit for miniature lithium (Li)-ion rechargeable batteries used in medical implant applications. An inductive link and integrated Schottky barrier rectifying diodes are used to extract the DC signal from a power carrier while providing low forward voltage drop for improved efficiency. The battery charger employs a new control loop that relaxes comparator resolution requirements, provides simultaneous operation of constant-current and constant-voltage loops, and eliminates the external current sense resistor from the charging path. The accuracy of the end-of-charge (EOC) detection is primarily determined by the voltage drop across matched resistors and current-sources and the offset voltage of the sense comparator. Experimental results in 0.6-mum 3M-2P CMOS technology indicate that plusmn1.3% (or plusmn20 muA) EOC accuracy can be obtained under worst case conditions for a comparator offset voltage of plusmn5 mV. The circuit measures roughly 1.74 mm² and dissipates 8.4 mW in the charging phase while delivering a load current of 1.5 mA at 4.1 V (or 6.15 mW) for an efficiency of 73%.