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[原创] TI BQ79606A-Q1高精度同时检测多达六个电池的解决方案

关键词:电源管理 汽车电子 BQ79606A-Q1

时间:2019-06-20 11:18:01       来源:中电网

TI公司的BQ79606A-Q1可提供同时高精度通路测量三到六个电池组,具有菊花链通信端口,它可堆栈高达64个器件,支持电动汽车的大堆栈配置.每个电池输入提供DeltaSigma转换器,可同时测量电池电压.器件满足汽车规范AEC-Q100,工作温度–40℃ 到 +105℃,HBM ESD分类level 2,CDM ESD分类level C4B,电压监测,温度监测和通信功能和SafeTI™-26262 ASIL-D兼容,失调电池电压测量精度± 1.1mV,可配置数字低通滤波器低至1.2Hz,96个电池时满精度堆栈测量小于1ms,器件集成了16位模数转换器(ADC)和高压AFE滤波器元件,堆栈配置多达64个器件(1个基本+63堆栈,384串联电池),隔离菊花链通信支持变压器和基于电容,可配置SINC3数字滤波器,集成了电池超温和低温二次保护以及电池超压和欠压二次保护,硬件保护和SafeTI™-26262ASIL-B兼容,器件还集成了电池平衡的MOSFET高达150mA,主要用在全电动汽车,插电式混合动力汽车和混合汽车,12V和48V锂电池汽车电池系统,电网蓄电池系统,不间断电源(UPS)以及电动自行车与电动滑板车.本文介绍了BQ79606A-Q1主要特性,简化系统框图和功能框图,多种应用电路,以及评估模块BQ79606EVM主要特性,系统堆栈图,电路图,材料清单和PCB设计图.

The BQ79606A-Q1 device provides simultaneous,high accuracy, channel measurements for three to sixbattery cells. With the inclusion of a daisy chaincommunication port, the BQ79606A-Q1 device isstackable (up to 64 devices) to support the largestack configurations found in battery packs forelectrified automotive drive trains. Providing a DeltaSigma converter per cell input, the BQ79606A-Q1allows simultaneous measurement of the batteryvoltages.

The BQ79606A-Q1 includes an auxiliary ADC thatsupports cell temperature measurements for up to sixNTCs as well as internal rails to enable safety checksfor the device. A die temperature measurement ADCis also included to provide temperature correction toenable high accuracy results over an extendedtemperature range.

The BQ79606A-Q1 device provides simultaneous,high accuracy, channel measurements for three to sixbattery cells. With the inclusion of a daisy chaincommunication port, the BQ79606A-Q1 device isstackable (up to 64 devices) to support the largestack configurations found in battery packs forelectrified automotive drive trains. Providing a DeltaSigma converter per cell input, the BQ79606A-Q1allows simultaneous measurement of the batteryvoltages.

The BQ79606A-Q1 includes an auxiliary ADC thatsupports cell temperature measurements for up to sixNTCs as well as internal rails to enable safety checksfor the device. A die temperature measurement ADCis also included to provide temperature correction toenable high accuracy results over an extendedtemperature range.

Host communication to the BQ79606A-Q1 device is done via dedicated UART interface. Additionally, an isolated,differential daisy-chain communication interface that supports either capacitor or transformer isolation allows thehost to communicate with the entire battery stack. The daisy-chain communication interface can be configured(optional) in a ring architecture that allows the host to talk to devices at either end of the stack in cases of communication line breaks.

BQ79606A-Q1主要特性:

• Qualified for automotive applications
• AEC-Q100 Qualified with the following results:
– Device temperature grade 2: –40℃ to +105°Cambient operating temperature range
– Device HBM ESD classification level 2
– Device CDM ESD classification level C4B
• Voltage monitor, temperature monitor andcommunication functions: SafeTI™-26262 ASIL-Dcompliant
• ± 1.1mV Cell voltage measurement accuracy withan offset
• Configurable digital low pass filter as low as 1.2Hz
• Supports simultaneous cell voltage measurements
– Full-accuracy stack measurements in less than1 ms (for 96 cells)
• Optional ring architecture to ensure stackcommunication even with communication cablebreak
• Monitors 3 to 6 cell connections and up to 6NTC/auxiliary channels
– Integrated 16-bit analog-to-digital converters(ADC)
• Integrated high-voltage AFE filter components
• Designed for robust hot-plug performance
• Stackable configuration up to 64 devices (1 base+ 63 stack, 384-series cells)
• Isolated differential daisy chain communication
– Supports transformer or capacitor basedisolation
• Configurable SINC3 digital filter
• Integrated hardware protector
– Secondary protection for cell overtemperatureand undertemperature
– Secondary protection for cell overvoltage andundervoltage
• Hardware protector function: SafeTI™-26262ASIL-B compliant
• Integrated cell-balancing MOSFET’s up to 150 mA
• Designed to pass BCI testing
• UART Host interface

BQ79606A-Q1应用:

• Full electric, plug-in hybrid, and hybrid vehicles
• Automotive 12-V and 48-V Li-Ion battery systems
• Grid storage battery systems
• Uninterruptible power supplies (UPS)
• E-Bikes, E-Scooters

图1.BQ79606A-Q1简化系统框图

图2.BQ79606A-Q1功能框图

图3.BQ79606A-Q1测量应用电路图

图4.输入连接器

图5.BQ79606A-Q1 6个电池的检测和电源连接应用电路图

图6.输入电源4.75V-5.5V的桥器件应用电路

图7.输入电源5.5V-30V的桥器件应用电路

图8.采用电容隔离而没有环狀架构的典型模块应用电路

图9.采用变压器隔离和环狀架构,板间电容+扼流圈,同一板仅用电容的14S典型模块应用电路

图10.多点配置典型模块应用电路

A).高低电压边界间变压器隔离

B).高低电压边界间数字/电源隔离
图11.采用通信总线基本器件的系统应用框图

图12.采用集成基本器件的系统应用框图


图13.采用多点基本器件的系统应用框图

BQ79606A-Q1评估模块BQ79606EVM

This user’s guide describes the general features, theory of operation, hardware setup, and use of theBQ79606EVM. Throughout this user’s guide, the abbreviations EVM, BQ79606EVM, and the termevaluation module are synonymous with the BQ79606A-Q1 Evaluation Module, unless otherwise noted.

This EVM is an evaluation board of the BQ79606A-Q1 device for use in large format lithium-ion batteriesthat provides monitoring, balancing, and communications.

The term TI HV EVM refers to an electronic device typically provided as an open framed, unenclosedprinted-circuit-board assembly. It is intended strictly for use in development laboratory environments,solely for qualified professional users having training, expertise, and knowledge of electrical safety risks indevelopment and application of high-voltage electrical circuits. Any other use or application are strictlyprohibited by Texas Instruments. If you are not suitably qualified, you should immediately stop from furtheruse of the HV EVM.

1. Work Area Safety:
1. Keep work area clean and orderly.
2. Qualified observer(s) must be present any time circuits are energized.
3. Effective barriers and signage must be present in the area where the TI HV EVM and its interfaceelectronics are energized, indicating operation of accessible high voltages may be present, for thepurpose of protecting inadvertent access.
4. All interface circuits, power supplies, evaluation modules, instruments, meters, scopes and otherrelated apparatus used in a development environment exceeding 50 VRMS or 75 VDC must beelectrically located within a protected Emergency Power Off (EPO) protected power strip.
5. Use a stable and non-conductive work surface.
6. Use adequately insulated clamps and wires to attach measurement probes and instruments. Nofreehand testing whenever possible.

2. Electrical Safety:As a precautionary measure, it is always a good engineering practice to assume thatthe entire EVM may have fully accessible and active high voltages.

1. De-energize the TI HV EVM and all its inputs, outputs, and electrical loads before performing anyelectrical or other diagnostic measurements. Revalidate that TI HV EVM power has been safelyde-energized.

2. With the EVM confirmed de-energized, proceed with required electrical circuit configurations,wiring, measurement equipment hook-ups and other application needs, while still assuming theEVM circuit and measuring instruments are electrically live.

3. Once EVM readiness is complete, energize the EVM as intended TI’s BQ79606EVM Battery Management System (BMS) is an evaluation board of the BQ79606A-Q1device for use in large format lithium-ion batteries that provide monitoring, balancing, andcommunications. Each BQ79606EVM can manage up to 6 cells (30-V max) for Li-ion battery applications.

Up to 64 BQ79606EVM modules can be stacked, for packs up to 1300 V. The system provides fast cellbalancing, diagnostics, and module to controller communication. Independent protection circuitry is alsoprovided. Please see the BQ79606A-Q1 data sheet for more details.

The BQ79606EVM is equipped with precision measurement and synchronous communication to enable amaster controller to perform State of Charge (SOC) and State of Health (SOH) estimation. Highly-accuratecell voltages and a fast sampling time for the entire battery pack allows more efficient operation of batterymodules and more accurate SOC and SOH calculations. Communication with stacked BQ79606EVMs isvia an isolated daisy-chain differential bus.

Control a single EVM or multiple stacked BQ79606EVMs using a PC-hosted GUI. Communicationbetween the PC and the lowest in a stack of BQ79606EVMs is via an FTDI USB-to-TTL (5 V) serialinterface cable. Communication between all other EVMs in the stack is via the isolated, daisy-chaindifferential communication bus. The PC GUI allows configuration of the BQ79606EVMs to monitor cellsand other analog data channels, control balancing, and monitor details of any faults.

评估模块BQ79606EVM主要特性:

• Passive cell balancing
• Isolated communications (1 kV)
• Flexible architecture for up to 6 cells
• UART interface
• High-accuracy cell voltage measurement
• Diagnostics
• Resistor ladder to simulate cell voltages

图14.评估模块BQ79606EVM系统堆栈图

图15.评估模块BQ79606EVM基本建立图

图16.评估模块BQ79606EVM高级建立图

图17.评估模块BQ79606EVM电路图(1)

图18.评估模块BQ79606EVM电路图(2)

图19.评估模块BQ79606EVM电路图(3)

图20.评估模块BQ79606EVM电路图(4)
评估模块BQ79606EVM材料清单:








图21.评估模块BQ79606EVM PCB设计图(1)

图22.评估模块BQ79606EVM PCB设计图(2)

图23.评估模块BQ79606EVM PCB设计图(3)

图24.评估模块BQ79606EVM PCB设计图(4)

图25.评估模块BQ79606EVM PCB设计图(5)

图26.评估模块BQ79606EVM PCB设计图(6)

图27.评估模块BQ79606EVM PCB设计图(7)

图28.评估模块BQ79606EVM PCB设计图(8)

图29.评估模块BQ79606EVM PCB设计图(9)
详情请见:
http://www.ti.com/lit/ds/symlink/bq79606a-q1.pdf
http://www.ti.com/lit/ug/slou471e/slou471e.pdf
slou471e.pdf
bq79606a-q1.pdf

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