Formulas used:
Bt(seconds) = [C(Vcapmax - Vcapmin)/Imax] This formula is valid for constant current only.
Bt(seconds) = -log(Vcapmin/Vcapmax)(RC) = t This formula is valid for linear current only (simple resistive load).
Where:
Imax
is the discharge current in amperes (A)
Vcapmin
is the ending voltage in volts (V)
Vcapmax
is the initial voltage in volts (V)
R
is the equivalent resistive load in ohms(Ω) based on : R=Vcapmax/Imax
C
is the capacitor value in farads 1F=1000 000μF=1000 000 000nF=1000 000 000 000pF
t
is the time in seconds(s)
Vcapmax:
V
Vcapmin:
V
Capacitor Size:
Farads
Capacitor ESR:
Ohms
Imax
uA
seconds (constant current discharge)
R
(calculated)
Ohms
seconds (resistor load discharge)
0ms
50s
100s
150s
200s
250s
300s
350s
400s
450s
500s
1.30
1.40
1.50
1.60
1.70
1.80
1.90
2.00
2.10
2.20
2.30
2.40
2.50
2.60
2.70
2.80
2.90
3.00
Linear
Constant
Voltage(V)
time
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