Atmel公司的ATA6870是鋰離子和NiMH電池組測量與監視電路, 主要用于混合動力汽車. ATA6870可管理多達16個電路,96個電池(三到六個電池組),為每個電池提供充電平衡能力,同時集成的線性穩壓器用來給MCU或外接元件供電.本文介紹了ATA6870主要特性, 方框圖, 一個和多個電池串的管理架構圖,以及ATA6870 評估板系統框圖和電路圖.
The ATA6870 is a measurement and monitoring circuit designed for Li-ion and NiMH multicell battery stacks in hybrid electrical vehicles. The ATA6870 monitors the battery-cell voltage and the battery-cell temperature with a 12-bit ADC.
The circuit also provides charge-balancing capability for each battery-cell. In addition, a linear regulator is integrated to supply a microcontroller or other external components. Reliable communication between stacked ICs is achieved by level-shifters with current sources. The ATA6870 can be connected to three, four, five or six battery-cells. Up to 16 circuits (96 cells) can be cascaded in one string. The number of strings is not limited.
ATA6870主要特性:
• 12-bit Battery-cell Voltage Measurement
• Simultaneous Battery Cells Measurement in Parallel
• Cell Temperature Measurement
• Charge Balancing Capability
– Parallel Balancing of Cells Possible
• Integrated Power Supply for MCU
• Undervoltage Detection
• Less than 10 μA Standby Current
• Low Cell Imbalance Current (< 10 μA)
• Hot Plug-in Capable
• Interrupt Timer for Cycling MCU Wake-ups
• Cost-efficient Solution Due to Cost-optimized 30V CMOS Technology
• Reliable Communication between Stacked ICs Due to Level Shifters with Current Sources and Checksum Monitoring of Data
• Daisy-chainable
– Each IC Monitors up to 6 Battery Cells
– 16 ICs (96 Cells) per String
– No Limit on Number of Strings
• Package QFN48 7 mm 7 mm
ATA6870應用:
• Battery Measurement, Supply and Monitoring IC for Li-ion and NiMH Battery Systems in Electric (EV) and Hybrid Electrical (HEV) Vehicles Benefits
• Highest Safety Level for Li-ion Battery Systems in Combination with ATA6871
• Cost Reduction Due to Integrated Measurement Circuit and High Voltage Power-supply
圖1.ATA6870方框圖
圖2.一個電池串的管理架構圖
圖3.多個電池串的管理架構圖
圖4.ATA6870斷電框圖
圖5.ATA6870和電池組間外接元件
圖6. 內部電源的MCU電源
圖7.外接電源的MCU電源
ATA6870 評估板
圖8.ATA6870 評估板外形圖
圖9.ATA6870 評估板系統框圖
圖10.ATA6870 評估板電路圖 |
