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參數(shù)資料
| 型號： | BQ2083 |
| 英文描述： | Silicon Bridge Rectifiers |
| 中文描述： | 銀紫荊星章符合電量監(jiān)測計芯片的使用與BQ29311 |
| 文件頁數(shù)： | 44/54頁 |
| 文件大?。?/td> | 461K |
| 代理商： | BQ2083 |
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SLUS573 JULY 2003
www.ti.com
44
EDV0,1,2 = n (EMF
FBL - | ILOAD |
R0
FTZ)
EMF is a no-load cell voltage higher than the highest cell EDV threshold computed. EMF is programmed in mV in
EMF/EDV1
DF 0x840x85.
ILOAD is the current discharge load magnitude.
n = the number of series cells
FBL is the factor that adjusts the EDV voltage for battery capacity and temperature to match the no-load
characteristics of the battery.
FBL
= f ( C0, C + C1, T )
C (either 0%, 3%, or
Battery Low %
for EDV0, EDV1, and EDV2, respectively) and C0 are the capacity- related
EDV adjustment factors. C0 is programmed in
EDV C0 Factor/EDV1
DF 0x8687. C1 is the desired residual
battery capacity remaining at EDV0 (RM = 0). The C1 factor is stored in
EDV C1 Factor
DF 0x8f.
T is the current temperature in
°
K.
R0
FTZ represents the resistance of a cell as a function of temperature and capacity.
FTZ = f ( R1 , T0, T, C + C1, TC)
R0 is the first order rate dependency factor stored in
EDV R0 Factor/EDV2
DF 0x880x89.
T is the current temperature; C is the battery capacity relating to EDV0, EDV1, and EDV2.
R1 adjusts the variation of impedance with battery capacity. R1 is programmed in
EDV
R1 Rate Factor
DF
0x8c-0x8d.
T0 adjusts the variation of impedance with battery temperature. T0 is programmed in
EDV T0 Rate Factor
DF
0x8a0x8b.
TC adjusts the variation of impedance for cold temperatures (T < 23
°
C). TC is programmed in
EDV TC
DF 0x8e.
Typical values for the EDV compensation factors, based on overall pack voltages for a Li-lon 3s2p 18650 pack,
are
EMF = 11550/3
T0 = 4475
C0 = 235
C1 = 0
R0 = 5350/3
R1 = 250
TC = 3
The graphs in Figures 8 and 9 show the calculated EDV0, EDV1, and EDV2 thresholds versus capacity using the
typical compensation values for different temperatures and loads for a Li-Ion 3s2p 18650 pack. The compensation
values vary widely for different cell types and manufacturers and must be matched exactly to the unique
characteristics for optimal performance.
(5)
(6)
(7)
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