Vl-E39S
10-1-2. Operation
60 min
Charging time
Timer
30 min
Quick charging
A
Trickle :
; charging
~
, .
I 0
-==='
-11
Vdetection
TiT'
:0
,
·
o
:
·
I
·
o
........
-----------IH-
·
1.5
(A)
Timer
~----~::::.:.-------:=-=-:-:--~
Initial
char
ging
+
'--
-:----'::...-.;"1:
Charge
voltage
1.0
Charge
current
0.5
4.Nickel-hydrogen battery charging mode
When the nickel-hydrogen battery is attached to the
adapterto which the DC plug is not attached, existence
of T terminal is detected, and the quick charging of
nickel-hydrogen is started.
The charging of the nickel-hydrogen battery has five
operating modes. These modes are switched succes-
sively.
When the nickel-hydrogen battery is attached, the pre-
charging is performed at first.
Inthis mode, it is charged with a constantcurrent (about
0.5A), and the mode is switched to the next mode after
Fig. 10-1-2 Charging characteristics
In case of 1500mAh Ni-Cd
battery
3.Refresh mode
In order to prevent reduction of charging efficiency due
to memory effect, thls adapter has a function to execute
the aforementioned charging operation after the pro-
vided battery is forcedly discharged to the full extent by
the user switch operation.
This mode is commonly specified for the Ni-Cd battery
and the undermentioned nickel-hydrogen battery.
When the refresh switch is pressed with the battery
attached, a discharge current (0.3 to OAA) will flow out,
and power will be consumed by the resistor inside the
adapter.
To minimize degradation of battery, the battery dis-
charge is ended when voltage of discharging battery
reduces down to about 3.0V. Then, the charging mode
is set automatically.
2.Ni-Cd charge mode
This adapter, when Ni-Cd battery is attached, can be
used as a quick charger. This charging operation has
three operating modes which are switched succes-
sively.
The first stage is called the initial charging. A constant
current 1.5A is used to charge within voltage limit (5.7V)
and time limit (set by 5 min timer).
The voltage is limited in order to protect the battery
against overvoltage and overcharge which may occur
due to recharging of fully charged battery.
The time limit serves to prevent the charging error which
may occur due to initial voltage drop of inactive battery.
The second stage is a quick charging. As with initial
charging, 1.5A quick charge is performed within voltage
limit (5.7V) and time limit set by the timer (180 minutes)
which are different from those of the initial charging.
During quick charging, a voltage drop
(-/'J,V
phenom-
enon) of the battery which occurs at the end of charging
is detected, the charging is stopped, and the next stage
is started.
When charging current is 1.5A, the 1500mAh battery,
and the undermentioned 2600mAh nickel-hydrogen
battery are fully charged for about 60 minutes and about
140 minutes, respectively.
The timer is set to 180 minutes time limit to avoid
overcharge which may be caused by
-fN
detection
error.
Here,
-fN
detection is set to 40 to 80mV.
The third stage is trickle charging. In this mode, the fully
charged state is kept even after the quick charging is
completed.
The trickle charging is generally set at
1/30 to
1/40C
depending onthe characteristics of battery. This adapter
adopts the charging system which is controlled by the
constant voltage control operation output and fixed
resistance.
These charging stages are shown in Figure 10-1-2.
1.Adapter mode
When the DC plug is attached to the adapter, the stable
DCvoltage (4.5V, 3.5A) iscontinuously supplied through
the DC jack to operate camcorder.
The power consumption is kept constant over the whole
control input range, regardless of input fluctuation.
The output is 1.3 or more times higherthan rated current
sothat the unit can withstand transition accompanied by
VTR starting current flow and rush current flow.
Also, for the adapteroutput, the overcurrent protector of
specific characteristics ensuring power control against
short-circuiting from outside isused toprotecttheadapter
from being damaged or broken down. It also prevents
the excessive heating inside the adapter.
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