© 2015 SmokerStore GmbH
Page: 28
no cable connections, MOSFET with only 2,5m
Ω
/
maxi
1m
Ω
! and
multilayer structure) our battery carrier is such low impedance, that
the total resistance becomes very low (typically 3m
Ω
/
maxi
1,5m
Ω
).
That‘s why a short circuit may cause irreparable damage.
If you are using a freshly charged highcapacity battery (extremely low
internal resistance) and accidentally an evaporator with a coil resis-
tance < 0.2
Ω
/
maxi
< 0.1
Ω
(or make a short curcuit), the max. per-
missible current is exceeded EXTREMELY in the first moment (< 0.001
sec.). In that split second, the built-in „power amplifier“ (MOSFET) is
like replacing your coil and heats up so quickly that the heat can NOT
be removed and accordingly, we can‘t measure any temperature in-
crease! The integrated temperature protection is reliable only for the
ongoing operation with permissible currents and temperature changes
within seconds (physically not feasible any other way).
Therefore, we measure the voltage drop ADDITIONALLY directly „abo-
ve“ the MOSFET to decide whether an impermissibly high current
flows through the MOSFET. In theory (without consideration of produc-
tion tolerances) the measure is taking place on every keystroke and
during operation (with different parameters). We measure as follows:
In the first 1.5ms the MOSFET passes through the area from non-con-
ductive (> 10M
Ω
) to perfect conducting (0.0025
Ω
/
maxi
0.001
Ω
).
In the following 0.5 milliseconds, we measure the voltage drop at full
load and decide: Shutdown (short circuit) or operation!
But we do not know what future batteries will provide. Accordingly, we
can not guarantee a short-circuit protection in general. In Reality the
interplay of coil, coil inductance and the various batteries is much to
complex! Therefore:
s#ONSIDERTHEMINIMUMRESISTANCEOF
Ω
/
maxi
0.1
Ω
!
s-AKESURETHATITDOESNOTGOBELOWITINANYOPERATINGCONDITIONS
Taifun Vireo
Operation manual
