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BQ78412 Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce BQ78412
Description  Pb-Acid Battery State-of-Charge Indicator With Run-Time Display
Download  36 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

BQ78412 Fiches technique(HTML) 8 Page - Texas Instruments

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UDG-10114
Months
12
24
95
96
97
98
30
48
99
100
6
0
18
36
42
CapDerateL
CapDerateH
Derate
Value (100 mAh)
Derate Change
bq78412
SLUSAA0 – OCTOBER 2010
www.ti.com
4Ah decrease in 0.1 Ah steps = 40 separate steps over 365 days
365 days / 40 decrement steps = one decrement step every 9.1 days
So CapDerateH = 9
Finally, 3 years is 365 days x 3 = 1095 days
So DerateChange = 1095
Note that due to slight rounding errors (12 days instead of 12.1 days, etc.) the actual capacity represented at the
end of any time internal (one year, two years, etc.) may be off by a small fraction.
In the example above, the actual implementation calculates to be as listed below (assuming no changes to FCC
from the learned capacity method occur):
Initial capacity = 100Ah and full charge capacity (FCC) decremented 0.1 Ah every 12 days:
End of year 1 capacity (at day 360) = 100Ah – 3.0Ah = 97Ah and (3.0Ah / 100Ah) = 3%
End of year 2 capacity (at day 732) = 97Ah – 3.1 Ah = 93.9Ah and (3.1 Ah / 93.9Ah) = 3.3%
End of year 3 capacity (at day 1095) = 93.9Ah – 3.0Ah = 90.9Ah and (3.0Ah / 90.9Ah) = 3.3%
Total from time 0 to Year 3: (100Ah – 90.9Ah) / 100Ah = 9.1% / 3 years = 3.033%/year
Figure 1 shows how the FCC decreases with time and how the parameters control this. Note that the parameter
values used in Figure 1 are different from the values used in the previous example.
Figure 1. Age Based Capacity Method
8
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