中国电子技术网

设为首页 网站地图 加入收藏

 

[原创] Maxim MAX172615.1μA多电池电量测量解决方案

关键词:仪器仪表 电量测量 智能手机 智能手表 可穿戴 手持计算机

时间:2019-09-10 11:33:55       来源:中电网

Maxim公司的MAX17261是可以实现Maxim ModelGauge™ m5算法的超低功耗多电池电量测量集成电路,采用外接电阻分压器可监测多个串联电池组.是业界最低IQ (5.1µA) 多电池电量测量IC.ModelGauge m5 EZ由于消除了电池特征要求和简化主软件交互而使得电池电量测量变得很容易.算法解决了大多数锂电池和应用时的电池差异性所带来的误差.算法组合了短期精度和基于电池电压的长期稳定性的电量计线性度,以及温度补偿以提供业界以流的电量计量精度.集成电路可自动补偿电池老化,温度和放电速率,提供精确的电荷状态(SOC)的百分比(%),在很宽的工作条件下以毫安时(mAh)计的剩余容量.当电池接进无电的临界状态时,算法可提出特别修正机理以消除任何的误差.器件提供电池放空和电池满格的精确估计时间,并提供三种方法报告电池的老化:容量减退,电池电阻增加和循环里程表.器件提供精密测量电流,电压和温度.电池组的温度测量采用内部温度传感器或外部温度计进行,精度±1°C.2线I2C接口提供接入数据和控制寄存器.宽检测电阻范围1mΩ 到1000mΩ,支持锂电池和包括LiFePO4在内的各种电池.主要用在平板电脑,二合一笔记本电脑,健康和健身监视器,数码相机,视频和动作摄像机,医疗设备,手持电脑和终端,金融终端,移动打印机,机器人,电动自行车,增强现实技术(AR)设备,无线扬声器.本文介绍了MAX17261主要优势和特性,功能框图和电池电量测试电路图,应用电路以及评估板MAX17261G和MAX17261X EV KIT主要特性,电路图,材料清单和PCB设计图.

The MAX17261 is an ultra-low power fuel gauge IC whichimplements the Maxim ModelGauge™ m5 algorithm. TheIC monitors a multiple-series cell battery pack with an externalresistor divider.

The ModelGauge m5 EZ algorithm makes fuel gauge implementationeasy by eliminating battery characterizationrequirements and simplifying host software interaction.

The algorithm provides tolerance against battery diversityfor most lithium batteries and applications.The algorithm combines the short-term accuracy and linearityof a coulomb counter with the long-term stability ofa voltage-based fuel gauge, along with temperature compensationto provide industry-leading fuel gauge accuracy.

The IC automatically compensates for cell-aging, temperature,discharge rate, and provides accurate state-ofcharge(SOC) in percentage (%) and remaining capacityin milliampere-hours (mAh) over a wide range of operatingconditions. As the battery approaches the critical regionnear empty, the algorithm invokes a special correction mechanism that eliminates any error. The IC providesaccurate estimation of time-to-empty and time-to-full andprovides three methods for reporting the age of the battery:reduction in capacity, increase in battery resistance,and cycle odometer.

The IC provides precision measurements of current, voltage,and temperature. The temperature of the batterypack is measured using an internal temperature sensor or external thermistor. A 2-wire I2C interface provides accessto data and control registers. The IC is available in a tinylead-free 0.4mm pitch, 1.5mm x 1.5mm, 9-pin WLP package and 3mm x 3mm, 14-pin TDFN package.

MAX17261主要优势和特性:

● ModelGauge m5 EZ
• No Characterization Required for EZ Performance
• Robust Against Battery Variation
• Eliminates Error Near Empty Voltage
• Eliminates Coulomb Counter Drift
• Compensates for Age, Current, and Temperature
• Does Not Require Empty, Full, or Idle States
● Low 5.1μA Operating Current
● Monitors Multiple-Cell Battery Pack
● Wide Sense Resistor Range: 1mΩ to 1000mΩ
● PCB Metal Sensing + Temperature Compensation
● Supports Li+ and Variants Including LiFePO4
● Thermistor or ±1°C Internal Temperature
● Dynamic Power Estimates Power Capability DuringDischarge
● Time-to-Empty and Time-to-Full Estimation
● Predicts Remaining Capacity Under Theoretical Load
● No Calibration Required
● Alert Indicator for Voltage, SOC, Temperature,Current and 1% SOC Change

MAX17261应用:

● Tablets, 2-in-1 Laptops
● Digital Still, Video, and Action Cameras
● Medical Devices
● Handheld Computers and Terminals
● Financial Terminals
● Mobile Printers
● Augmented/Virtual Reality Devices
● Robots
● E-Bikes
● Battery Backups
● Wireless Speakers

图1.MAX17261电池电量测试电路图

图2.MAX17261功能框图

图3.MAX17261低边电流测量应用电路图

图4.MAX17261多个串联电池应用电路图

评估板MAX17261G/MAX17261X EV KIT

The MAX17261G/MAX17261X evaluation kits (EV kits) are fully assembled and tested surface-mount PCBs that evaluate the stand-alone ModelGauge™ m5 host-side fuel-gauge ICs for lithium-ion (Li+) batteries in handheld and portable equipment.

The MAX17261G/MAX17261X EV kits include the Maxim DS91230+ USB interface, IC evaluation board, and RJ-11 connection cable. Windows®-based graphical user interface (GUI) software is available for use with the EV kits and can be downloaded from Maxim’s website at www.maximintegrated.com/products/MAX17261 (under the Design Resources tab). Windows 7 or newer Windows operating system is required to use with the EV kit GUI software.

评估板MAX17261G/MAX17261X EV KIT主要特性和优势:

ModelGauge m5 Algorithm
Monitors from 2S+ Cell Packs
Battery Pack Input Voltage Range of +4.6V to +39.2V
Thermistor Measurement Network
Optional On-Board PCB Trace Sense Resistor
Windows 7 or Newer Compatible Software
Proven PCB Layout
Fully Assembled and Tested


图5.评估板MAX17261X EVIT外形图

图6.评估板MAX17261G/MAX17261X EV KIT连接图

图7.评估板MAX17261G EV KIT电路图
评估板MAX17261G EV KIT材料清单:


图8.评估板MAX17261G EV KIT PCB设计图:左:顶层丝印;右:顶层布局

图9.评估板MAX17261G EV KIT PCB设计图:底层布局

图10.评估板MAX17261X EV KIT电路图
评估板MAX17261X EV KIT材料清单:


图11.评估板MAX17261X EV KIT PCB设计图:左:顶层丝印;右:顶层布局

图12.评估板MAX17261X EV KIT PCB设计图:底层布局
详情请见:
https://datasheets.maximintegrated.com/en/ds/MAX17261.pdf
https://datasheets.maximintegrated.com/en/ds/MAX17261GEVKIT-MAX17261XEVKIT.pdf
MAX17261.pdf
MAX17261GEVKIT-MAX17261XEVKIT.pdf

  • 分享到:

 

猜你喜欢