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ADI AD7280A全绝缘锂电池组监测和保护解决方案 测试测量 免费猫

发布时间:2020-02-17 12:34:26 阅读: 来源:电能表厂家

ADI AD7280A全绝缘锂电池组监测和保护解决方案 - 测试测量 - 电子工程网

ADI公司的全绝缘锂电池组监测和保护系统采用锂电池组监测AD7280A, 锂电池组安全监测AD8280,集成了DC/DC转换器的四路隔离器ADuM5404以及四路数字绝缘器ADuM1400,能增强电池效率,延长电池寿命和确保电池安全.主要用在锂电池监视,电动和混合电力汽车,备份电源和电动工具.本文介绍了AD7280A主要特性, 方框图, AD7280A菊花链配置图以及锂电池组检测和保护系统简化电路图,CN0235电路评估板EVAL-CN0235-SDPZ电路图,材料清单和PCB布局图.

The AD7280A contains all the functions required for general- purpose monitoring of stacked lithium ion batteries as used in hybrid electric vehicles, battery backup applications, and power tools. The part has multiplexed cell voltage and auxiliary ADC measurement channels for up to six cells of battery management. An internal ±3 ppm/℃ reference is provided that allows a cell voltage accuracy of ±1.6 mV. The ADC resolution is 12 bits and allows conversion of up to 48 cells within 7 μs. The AD7280A operates from a single VDD supply that has a range of 8 V to 30 V (with an absolute maximum rating of 33 V). The part provides six differential analog input channels to accommodate large common-mode signals across the full VDD range. Each channel allows an input signal range, VIN(+) VIN( ), of 1 V to 5 V. The input pins assume a series stack of six cells. In addition, the part includes six auxiliary ADC input channels that can be used for temperature measurement or system diagnostics. The AD7280A includes on-chip registers that allow a sequence of channel measurements to be programmed to suit the application requirements. The AD7280A also includes a dynamic alert function that can detect whether the cell voltages or auxiliary ADC inputs exceed an upper or lower limit defined by the user. The AD7280A has cell balancing interface outputs designed to control external FET transistors to allow discharging of individual cells. The AD7280A includes a built-in self-test feature that internally applies a known voltage to the ADC inputs. A daisy-chain interface allows up to eight parts to be stacked without the need for individual device isolation. The AD7280A requires only one supply pin that accepts 6.9 mA under normal operation while converting at 1 MSPS. All this functionality is provided in a 48-lead LQFP package operating over a temperature range of 40℃ to +105℃.

AD7280A主要特性:

12-bit ADC, 1 μs per channel conversion time

6 analog input channels, common-mode range 0.5 V to 27.5 V

6 auxiliary ADC inputs

±1.6 mV cell voltage accuracy

On-chip voltage regulator

Cell balancing interface

Daisy-chain interface

nternal reference: ±3 ppm/oC

1.8 μA power-down current

High input impedance

Serial interface with alert function

1 SPI interface for up to 48 channels

CRC protection on read and write commands

On-chip registers for channel sequencing

VDD operating range: 8 V to 30 V

Temperature range: 40℃ to +105℃

48-lead LQFP Qualified for automotive applications

AD7280A应用:

Lithium ion battery monitoring

Electric and hybrid electric vehicles

Power supply backup

Power tools

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