| TI bq78PL114锂电池控制管理方案 |
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| 作者：浙江机电职业技术学院 葛惠民 张伟中 来源：TI 点击数：124 更新时间：2008-10-13 |
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TI 公司的bq78PL114是完整的锂电池控制,监视和安全管理解决方案,适用于多达12个锂电池串联应用.本文介绍了bq78PL114的主要特性,方框图以及PowerLAN多个电池系统实现方案框图, bq78PL114简化应用电路, 3个电池串联和8个电池串联的参考电路图.
TI The bq78PL114 master gateway battery controller is part of a complete Li-Ion control, monitoring, and safety solution designed for large series cell strings.
The bq78PL114, along with PowerLAN cell monitors, provides complete battery system control, communications, and safety functions for a structure of three to 12 series cells. This PowerLAN system provides simultaneous, synchronized voltage and temperature measurements using one-ADC-per-cell technology. Voltage measurements are also synchronized with pack current measurements, eliminating system-induced noise from measurements. This allows the precise, continuous, real-time calculation of cell impedance under all operating conditions, even during widely fluctuating load conditions.
PowerPump technology transfers charge between cells to balance their voltage and capacity. Balancing is possible during all battery modes: charge, discharge, and rest. Highly efficient charge-transfer circuitry nearly eliminates energy loss while providing true real-time balance between cells, resulting in longer run-time and improved cycle life.
Temperature is sensed by up to six external sensors. This permits accurate temperature monitoring of each cell individually. Firmware is then able to compensate for the temperature-induced effects on capacity, impedance, and OCV on a cell-by-cell basis, resulting in superior charge/ discharge and balancing control.
External MOSFET control inputs provide user- definable direct hardware control over MOSFET states. Smart control prevents excessive current through MOSFET body diodes. Auxiliary inputs can be used for enhanced safety and control in large multicell arrays.
The bq78PL114 is completely user-configurable, with parametric tables in flash memory to suit a variety of cell chemistries, operating conditions, safety controls, and data reporting needs. It is easily configured using the supplied bqWizard graphical user interface (GUI). The device is fully programmed and requires no algorithm or firmware development.
bq78PL114主要特性:
Designed for Managing up to 12 Series Cell Battery Systems
SmartSafety Features:
Prevention: Optimal Cell Management
Diagnosis: Improved Sensing of Cell Problems
Fail Safe: Detection of Event Precursors
Rate-of-Change Detection of All Important Cell Characteristics:
Voltage
Impedance
Cell Temperature
PowerPump Technology Transfers Charge Efficiently From Cell to Cell During All Operating Conditions, Resulting in Longer Run Time and Cell Life
High-Resolution 18-Bit Integrating Delta-Sigma Coulomb Counter for Precise Charge-Flow Measurements and Gas Gauging
Multiple Independent Δ-Σ ADCs: One-per-Cell Voltage, Plus Separate Temperature, Current, and Safety
Simultaneous, Synchronous Measurement of Pack Current and Individual Cell Voltages
Very Low Power Consumption:< 250 µA Active, < 150 µA Standby, < 40 µA Ship, and
< 1-µA Undervoltage Shutdown
Accurate, Advanced Temperature Monitoring of Cells and MOSFETs With up to Six Sensors
Fail-Safe Operation of Pack Protection Circuits: Up to Three Power MOSFETs and One Secondary Safety Output (Fuse)
Fully Programmable Voltage, Current, Balance, and Temperature-Protection Features
External Inputs for Auxiliary MOSFET Control
Smart Battery System 1.1 Compliant via SMBus or SPI Interface With SHA-1 Authentication Option
bq78PL114应用:
Portable Medical Instruments and Test Equipment
Mobility Devices (E-Bike)
Uninterruptible Power Supplies and Hand-Held Tools
图1.bq78PL114方框图
图2.PowerLAN多个电池系统实现方案框图
图3.bq78PL114简化应用电路
图4.bq78PL114参考电路图(3个电池串联)
图5.bq78PL114参考电路(8个电池串联)
详情请见:
http://focus.ti.com/lit/ds/symlink/bq78pl114.pdf[1]
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