TI公司的bq76PL536A-Q1是可堆棧的三--六顆鋰電池組保護器和模擬前端(AFE),集成了精密的ADC,單獨的電池電壓和溫度保護,電池平衡和給用戶電路供電的精密V穩(wěn)壓器.電源電壓從7.2 V 到 27 V,主要用在電動和混合動力汽車,電動自行車和電動滑板車,不間斷電源(UPS)和大型電池系統(tǒng).本文介紹了bq76PL536A-Q1主要特性,框圖和簡化的系統(tǒng)連接圖以及鋰電池監(jiān)視和保護參考設計TIDA-00821主要特性,框圖,電路圖,材料清單和PCB設計圖.
The bq76PL536A-Q1 is a stackable three to six series cell lithium-ion battery pack protector and analog front end （AFE） that incorporates a precision analog-to-digital converter （ADC）; independent cell voltage and temperature protecTIon; cell balancing， and a precision 5-V regulator to power user circuitry.
The bq76PL536A-Q1 integrates a voltage translaTIon and precision analog-to-digital converter system to measure battery cell voltages with high accuracy and speed.
The bq76PL536A-Q1 provides full protection （secondary protection） for overvoltage， undervoltage， and overtemperature conditions. When safety thresholds are exceeded， the bq76PL536A-Q1 sets the FAULT output. No external components are needed to configure or enable the protection features.
Cell voltage and temperature protection functions are independent of the ADC system. Programmable protection thresholds and detection delay times are stored in Error Check/Correct （ECC） OTP EPROM， which increases the flexibility and reliability of the battery management system.
The bq76PL536A-Q1 is intended to be used with a host controller to maximize the functionality of the battery management system. However， the protection functions do not require a host controller.
The bq76PL536A-Q1 can be stacked vertically to monitor up to 192 cells without additional isolation components between ICs. A high-speed serial peripheral interface （SPI） bus operates between each bq76PL536A-Q1 to provide reliable communications through a high-voltage battery cell stack.
bq76PL536A-Q1主要特性：
• Three-to-six series cell support， all chemistries
• Hot-pluggable
• High-speed serial peripheral interface （SPI） for data communications
• Stackable vertical interface
• Isolation components not required between devices
• Qualified for automotive applications
• AEC-Q100 qualified with the following results：
– Device temperature grade 2： –40℃ to 105℃ ambient operating temperature range
– Device HBM classification level 2
– Device CDM classification level C4B
• High-accuracy ADC：
– ±1-mV typical accuracy
– 14-bit resolution， 6-μs conversion time
– Nine ADC inputs
– Dedicated pins for synchronizing measurements
• Configuration data stored in error check/correct（ECC）one-time-programmable （OTP）registers
• Built-in comparators （secondary protector） for：
– Overvoltage and undervoltage protection
– Overtemperature protection
– Programmable thresholds and delay times
– Dedicated fault signals
• Cell balancing control outputs with safety timeout
– Balance current set by external components
• Supply voltage range from 7.2 V to 27 V continuous and 36-V peak
• Low power：
– Typical 12-μA sleep， 45-μA idle
• Integrated precision 5-V，3-mA LDO
bq76PL536A-Q1應用：
Electric and Hybrid Electric Vehicles
E-Bike and E-Scooter
Uninterruptible Power Systems （UPS）
Large-Format Battery Systems
bq76PL536A-Q1終端設備：
EV HEV Battery Management System
HEV/EV - Battery Management System （BMS）
圖1.bq76PL536A-Q1框圖
圖2.bq76PL536A-Q1簡化的系統(tǒng)連接圖
bq76PL536A-Q1參考設計TIDA-00821
The TIDA-00821 reference design is a stackable monitor and protector for use in large format Lithium-ion batteries that provides monitoring， balancing， and communications. Each bq76PL536A-Q1 EVM can manage 3 to 6 cells for Li-ion battery applications. Up to 32 bq76PL536A-Q1 EVM modules can be stacked. The system provides fast cell balancing， diagnostics， and module to controller communication. Independent protection circuitry isalso integrated.
參考設計TIDA-00821主要特性：
Highly accurate monitoring and protection
Engineered for high system robustness
1-Mb/s stackable vertical interface
Built in comparator for secondary OV， UV and OT protector
Cell balancing control output with safety timeout
圖3.參考設計TIDA-00821外形圖
圖4. bq76PL536A-Q1 EVM-3測試建立圖
圖5.參考設計TIDA-00821框圖
圖6.參考設計TIDA-00821電路圖(1)
圖7.參考設計TIDA-00821電路圖(2)
圖8.參考設計TIDA-00821電路圖(3)
圖9.參考設計TIDA-00821電路圖(4)
參考設計TIDA-00821材料清單(BOM):
圖10.參考設計TIDA-00821 PCB設計圖(1)
圖11.參考設計TIDA-00821 PCB設計圖(2)
圖12.參考設計TIDA-00821 PCB設計圖(3)
圖13.參考設計TIDA-00821 PCB設計圖(4)
圖14.參考設計TIDA-00821 PCB設計圖(5)
圖15.參考設計TIDA-00821 PCB設計圖(6)
圖16.參考設計TIDA-00821 PCB設計圖(7)
圖17.參考設計TIDA-00821 PCB設計圖(8)
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