Why
cell phone
power down so fast by using the computer usb charging ?
the
answer is simple,
because
you
are
not
at all
likely
filled with
computer
USB
output
voltage
of
5
v is
generally
very
accurate,
we
feel that the
USB
charging
discontent,
because
USB
output
current is
small,
and
the
final
stage of
charging,
need
a
trickle
charge.
Trickle
charge
is
to
cover the
battery
at
full
charge
capacity
loss
due to
self-discharge.
After the
battery
is fully
charged,
due to the
self-discharge
loss
of
capacity
is
approximately
the
nominal
capacity
of the
5%.
Mobile phone
charging
principles.
At present,almost all mobile phonesare powered by lithium batteries.Seen from thechargingand charging of the lithium-ionbattery is limited pressure constant flow,is controlledby an IC chip,specifically,is to test the voltage of thebattery tobe charged,if the voltage islower than3V,then hands theopportunityto charge 1/10 ofcharge current is set current.When thevoltage rises to 3V,hand access to thestandardsof the chargingprocess.
Previously
tested
media,
laptop
USB
to
charge a
cell phone,
compared
with the
original
charger
to
charge
mobile phones,
charging
voltage
slightly
higher,
probably
for
5V
and
4.2V
before and after,
and
slightly
lower
charging
current,
and
about
190mA
and
220mA,
but
desktop
USB,
charging
voltage
at
5
v,
while the
charge
current
is
increased
to
230mA.
So can obtained
conclusion, with computer USB to phone charging and with
original charger to phone charging, difference just current of
different, and charging speed of different just, and security no
too big of relationship, even is in charging process in the
touch phone, you of hand will has numb sense, also just is
induction electric just, this with air humidity and you by wear
of clothes has must of relationship, with electrostatic similar,
if you really of think not comfortable, so solution method also
is simple, will host put in ground Shang can.
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