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BQ4050EVM-561: 有关于BQ4050 2.6 Hardware-based protection详细的说明？

lueng cheng
Prodigy 250 points
Part Number: BQ4050EVM-561
Other Parts Discussed in Thread: BQ4050, BQ40Z50, BQSTUDIO

看了BQ4050的TRM文档，第2.6章节有关于【 Hardware-based protection】内容，这部分内部看到几次，还是理解不了。

这里的充电/放电的短路保护与protection里的过流保护有什么区别呢，是不是短路保护的速度快一点？

另外，这个针对电池短路，不是针对pack端短路？

  • 0
    TI__Guru* 81380 points

    您好，

    lueng cheng 说：

    这里的充电/放电的短路保护与protection里的过流保护有什么区别呢，是不是短路保护的速度快一点？

    另外，这个针对电池短路，不是针对pack端短路？

    您方便分享下这里的截图吗？

  • 0 回复 Cherry Zhou
    Prodigy 250 points

    在bq4050的TRM文档的2.4、2.5、2.6这几部分：

     

    另外，【 Hardware-based protection】短路保护这里的Delay时间的单位是秒，还是ms或其它呢？

  • 0 回复 lueng cheng
    TI__Mastermind 33350 points

    过流保护是基于固件的保护，而短路保护是基于硬件的。 硬件保护通常更快。

    对于短路保护，以微秒为单位。 数据表中概述了硬件保护的延迟时间。

  • 0 回复 Annie Liu
    Prodigy 250 points

    你好，谢谢，这个回复太详细了。

  • 0 回复 Annie Liu
    Prodigy 250 points

    你好，我还有一个疑问，为bq4050的TRM文档的14.2.4.3章节里，有ASCC控制位，但bqStudio软件里，却没有这个控制位，是不是默认打开ASCC功能？

    另外，14.2.4 protection章节里，找不到【ASCD】设置位，仅有【ASCDL】设置位，是不是ASCD设置位也是默认打开？

  • 0 回复 lueng cheng
    TI__Mastermind 33350 points

    该位应保留且不更改默认值。硬件保护始终处于启用状态，因此您无法禁用它们。如果您切换默认位，保护仍会关闭 FET，但寄存器页面不会显示 ASCC 故障，这在尝试调试时可能会造成混乱。

  • 0 回复 Annie Liu
    Prodigy 250 points

    liu，

    你好。今天我做了一下ascd（放电短路保护）功能，设置的参数为ASCD->Threshold1 = 73，ASCD->Threshold2 = e3，同时做了以下2个实验：

    1.使能ASCDL功能（protections B 的 ASCDL位 = 1）

      Latch Limit = 0， Counter Dec Delay = 10S， Recovery = 5 S，Reset = 15S

    2.禁止ASCDL功能（protections B 的 ASCDL位 = 0）

    以上2个实验中，都没有看到短路保护，并且safety status的ASCD位为0（绿色）。

    请问为什么没有起放电短路保护呢？

  • 0 回复 lueng cheng
    TI__Mastermind 33350 points

    为了更好分析您的问题，您能否提供发生此问题的 BQStudio 日志文件？ 另外，可以发一下gg文件吗？

  • 0 回复 Annie Liu
    Prodigy 250 points

    2个实验的gg文件和log。在操作过程中，短路后，在studio界面的【DashBoard】里，电流表保持3秒以上，都没有短路保护，然后就手动切断电源了。请帮忙看一下，为什么放电短路没有效果？

    bq4050_ascd_3A_without_ocd.csvbq4050_ascd_3A_with_ocd.csv

    全屏 bq4050_ascd_3A_with_ocd.log 下载 
    Tue Jul 18 10:04:29 CST 2023

Device Version Info = 9e34_0_01
BQZ Device Name = bq4050
BQZ Firmware Version = V0_01_BLD22

Design Capacity = 8464
Design Voltage = 14800
Specification Info = 0x0031
Manufacturer Date = 1980-1-1
Serial Number = 0x0001
Manufacturer Name = Texas Instruments
Device Name = bq4050
Device Chemistry = LION

Sample,DateTime,ElapsedTime,ManufAccess,RemCapAlarm,RemTimeAlarm,BattMode,@Rate(@),@TimeFull,@TimeEmpty,@RateOK,Temperature,Voltage,Current,AvgCurr,MaxErr,RSOC,ASOC,SOH,RemCap,FullChgCap,RunTimeEmty,RunTimeEmty,AvgTimeFull,ChgCurr,ChgVolt,BattStat,CycleCnt,OpStatA,OpStatB,TempRange,ChgStat,GaugeStat,MfgStat,SafetyAlertAB,SafetyStatAB,SafetyAlertCD,SafetyStatCD,PFAlertAB,PFStatAB,PFAlertCD,PFStatCD,CellVolt1,CellVolt2,CellVolt3,CellVolt4,vBAT,vPACK,CellCurr1,CellCurr2,CellCurr3,CellCurr4,CellPower1,CellPower2,CellPower3,CellPower4,Power,AvgPow,IntTemp,TS1Temp,TS2Temp,TS3Temp,TS4Temp,CellTemp,FETTemp,CEDV_RC,DSGCap,CEDVThr,CEDVFltV,ChgDeficit,LogRowTime(ms),LogStatus
1,2023-07-18 10:04:33,4.007,0x0187,4320,10,0xE001,0,65535,65535,1,28.3,15274,0,0,100,98,49,50,36160,37000,65535,65535,65535,1000,15800,0x00C0,0,0x0187,0x0000,0x10,0x0004,0x40,0x0010,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,3863,3803,3806,3802,15023,15267,0,0,0,0,0,0,0,0,0,0,29.3,25.7,28.4,28.3,28.4,28.3,-273.2,2443,51,12268,14182,0,778,SUCCESS
2,2023-07-18 10:04:37,8.017,0x0187,4320,10,0xE001,0,65535,65535,1,28.3,15273,0,0,100,98,49,50,36160,37000,65535,65535,65535,1000,15800,0x00C0,0,0x0187,0x0000,0x10,0x0004,0x40,0x0010,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,3863,3803,3806,3802,15021,15267,0,0,0,0,0,0,0,0,0,0,29.3,25.7,28.4,28.3,28.4,28.3,-273.2,2443,51,12268,14182,0,751,SUCCESS
3,2023-07-18 10:04:41,12.026,0x0187,4320,10,0xE001,0,65535,65535,1,28.4,15274,0,0,100,98,49,50,36160,37000,65535,65535,65535,1000,15800,0x00C0,0,0x0187,0x0000,0x10,0x0004,0x40,0x0010,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,3863,3803,3806,3802,15021,15268,0,0,0,0,0,0,0,0,0,0,29.3,25.7,28.4,28.4,28.5,28.4,-273.2,2443,51,12268,14182,0,788,SUCCESS
4,2023-07-18 10:04:45,16.027,0x0187,4320,10,0xE001,0,65535,65535,1,28.4,13692,-4284,-842,100,98,49,50,36110,37000,37,188,65535,1000,15800,0x08C0,0,0x0187,0x0000,0x10,0x0002,0x40,0x0010,0x0010,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,3441,3483,3481,3286,13474,13646,-4264,-4258,-4266,-4266,-1467,-1483,-1485,-1402,-5842,-1190,29.3,25.7,28.4,28.4,28.4,28.4,-273.2,2439,54,10720,13688,0,775,SUCCESS
5,2023-07-18 10:04:49,20.041,0x0187,4320,10,0xE001,0,65535,65535,1,28.4,13692,-4173,-1655,100,98,49,50,36040,37000,38,95,65535,1000,15800,0x08C0,0,0x0187,0x0000,0x10,0x0002,0x40,0x0010,0x0010,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,3442,3482,3480,3289,13479,13647,-4151,-4146,-4154,-4149,-1429,-1444,-1446,-1365,-5693,-2293,29.3,25.7,28.4,28.4,28.4,28.4,-273.2,2434,59,10808,13688,0,814,SUCCESS
6,2023-07-18 10:04:53,24.041,0x0187,4320,10,0xE001,0,65535,65535,1,28.4,15208,0,0,100,98,49,50,36010,37000,65535,65535,65535,1000,15800,0x00C0,0,0x0187,0x0000,0x10,0x0004,0x40,0x0010,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,3847,3787,3790,3787,14958,15206,0,0,0,0,0,0,0,0,0,0,29.4,25.7,28.4,28.4,28.5,28.4,-273.2,2433,61,11678,13700,0,799,SUCCESS
7,2023-07-18 10:04:57,28.052,0x0187,4320,10,0xE001,0,65535,65535,1,28.4,15222,0,0,100,98,49,50,36010,37000,65535,65535,65535,1000,15800,0x00C0,0,0x0187,0x0000,0x10,0x0004,0x40,0x0010,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,3850,3791,3793,3790,14972,15216,0,0,0,0,0,0,0,0,0,0,29.4,25.7,28.4,28.4,28.5,28.4,-273.2,2433,61,11678,13700,0,795,SUCCESS
    全屏 bq4050_ascd_3A_without_ocd.log 下载 
    Tue Jul 18 10:06:03 CST 2023

Device Version Info = 9e34_0_01
BQZ Device Name = bq4050
BQZ Firmware Version = V0_01_BLD22

Design Capacity = 8464
Design Voltage = 14800
Specification Info = 0x0031
Manufacturer Date = 1980-1-1
Serial Number = 0x0001
Manufacturer Name = Texas Instruments
Device Name = bq4050
Device Chemistry = LION

Sample,DateTime,ElapsedTime,ManufAccess,RemCapAlarm,RemTimeAlarm,BattMode,@Rate(@),@TimeFull,@TimeEmpty,@RateOK,Temperature,Voltage,Current,AvgCurr,MaxErr,RSOC,ASOC,SOH,RemCap,FullChgCap,RunTimeEmty,RunTimeEmty,AvgTimeFull,ChgCurr,ChgVolt,BattStat,CycleCnt,OpStatA,OpStatB,TempRange,ChgStat,GaugeStat,MfgStat,SafetyAlertAB,SafetyStatAB,SafetyAlertCD,SafetyStatCD,PFAlertAB,PFStatAB,PFAlertCD,PFStatCD,CellVolt1,CellVolt2,CellVolt3,CellVolt4,vBAT,vPACK,CellCurr1,CellCurr2,CellCurr3,CellCurr4,CellPower1,CellPower2,CellPower3,CellPower4,Power,AvgPow,IntTemp,TS1Temp,TS2Temp,TS3Temp,TS4Temp,CellTemp,FETTemp,CEDV_RC,DSGCap,CEDVThr,CEDVFltV,ChgDeficit,LogRowTime(ms),LogStatus
1,2023-07-18 10:06:07,4.015,0x0187,4320,10,0xE001,0,65535,65535,1,28.5,15256,0,0,100,98,49,50,36010,37000,65535,65535,65535,1000,15800,0x00C0,0,0x0187,0x0000,0x10,0x0004,0x40,0x0010,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,3859,3798,3802,3798,15005,15252,0,0,0,0,0,0,0,0,0,0,29.5,25.9,28.5,28.5,28.5,28.5,-273.2,2433,61,11678,13700,0,751,SUCCESS
2,2023-07-18 10:06:11,8.029,0x0187,4320,10,0xE001,0,65535,65535,1,28.5,13686,-4236,-814,100,98,49,50,35950,37000,37,194,65535,1000,15800,0x00C0,0,0x0187,0x0000,0x10,0x0002,0x40,0x0010,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,3440,3480,3479,3284,13468,13642,-4217,-4228,-4224,-4222,-1451,-1471,-1470,-1387,-5777,-1117,29.5,25.9,28.5,28.5,28.5,28.5,-273.2,2429,65,10768,13682,0,808,SUCCESS
3,2023-07-18 10:06:15,12.043,0x0187,4320,10,0xE001,0,65535,65535,1,28.5,14999,-1246,-1428,100,98,49,50,35900,37000,114,100,65535,1000,15800,0x00C0,0,0x0187,0x0000,0x10,0x0004,0x40,0x0010,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,3842,3783,3786,3783,14887,15191,-19,-11,-4,-7,-7,-4,-2,-3,-5,-1969,29.6,25.9,28.5,28.5,28.6,28.5,-273.2,2426,68,11694,13689,0,785,SUCCESS
4,2023-07-18 10:06:19,16.049,0x0187,4320,10,0xE001,0,65535,65535,1,28.5,15212,0,0,100,98,49,50,35900,37000,65535,65535,65535,1000,15800,0x00C0,0,0x0187,0x0000,0x10,0x0004,0x40,0x0010,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,3848,3788,3791,3787,14962,15209,0,0,0,0,0,0,0,0,0,0,29.5,25.9,28.6,28.5,28.5,28.5,-273.2,2426,68,12196,13689,0,763,SUCCESS
5,2023-07-18 10:06:23,20.061,0x0187,4320,10,0xE001,0,65535,65535,1,28.5,15220,0,0,100,98,49,50,35900,37000,65535,65535,65535,1000,15800,0x00C0,0,0x0187,0x0000,0x10,0x0004,0x40,0x0010,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,3850,3790,3793,3789,14971,15214,0,0,0,0,0,0,0,0,0,0,29.6,25.9,28.6,28.5,28.5,28.5,-273.2,2426,68,12196,13689,0,778,SUCCESS

  • 0 回复 lueng cheng
    TI__Mastermind 33350 points

    查看了日志文件和 gg 文件，gauge看起来是按预期工作。ASCD 保护未跳闸，因为gauge未测量该保护关闭所需的电流。如果阈值设置为最低设置“0x00”，则gauge将需要测量至少 22.2 amps电流才能触发此保护。这是通过将阈值电压 (-22.2mV) 除以检测电阻值（由于您使用的是 EVM，因此这是一个 1 毫欧电阻）来计算的。因此 -22.2mV/1mOhm = -22.2 amps。然而，由于在放电期间设置了安全警报位，因此 OCD 保护正在按预期工作。

  • 0 回复 Annie Liu
    Prodigy 250 points

    liu，你好。ascd的问题，将sense电阻由1mohm改为10mohm，就可以ascd保护了。

    ascd是电压保护机制，1mohm时，估计达不到相应的阀值，因此起不了保护。

    现在有另外一个问题，关闭电量学习的，具体现象描述在 个链接：https://e2echina.ti.com/support/power-management/f/power-management-forum/758060/bq4050evm-561-bq4050

    希望，你能提供一些解决建议，谢谢

  • 0 回复 lueng cheng
    TI__Mastermind 33350 points

    电量学习的问题，负责那个帖子的工程师会为您跟进的，谢谢。

  • 0 回复 Annie Liu
    Prodigy 250 points

    我的电池包为4串的，按你同事的建议，将EDV_PACK设置为1时，不知道为什么一放电，EDV2和EDV1就立刻变红色。

    记得为单个电池时，放电时，VDQ会先变红，当放到3.1V附近时，EDV2先变红，再继续放电，EDV1才变红。

    不知道4串时，学习的现象是这样的，与TRM文档描述的不一样，现在比较迷惑。

  • 0 回复 lueng cheng
    TI__Mastermind 33350 points

    这是正确的，如果您希望 ASCD 保护在低于 22 安培的电流下触发，那么您将需要更改检测电阻。