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6-4 Rapid Desk-Top Charger
Rapid Charger, DTC58 is composed of power supply part and control part.
6-4-1 Power Supply Part (Flyback type
SMPS circuit)
AC INPUT
AC input protection circuit and rectifier circuit
AC power through the AC plug is rectifiered to
DC power of high voltage through the BD1 and
C2. MOV1 is used by protection circuit from AC
power surge. F1 is fuse to prevent over current. C1
and LF1 is EMI noise protection filter of switching
power.
Switching controller and transformer
IC1 supplies constant voltage and constant current
to secondary circuit through the transformer. D1,
D2 absorbs the reverse voltage when transformer
winding turns off.
SECONDARY POWER
Output constant voltage circuit : HIC, IC7, VR1
The HIC detects output voltage and compares it
with reference voltage in HIC. The error is FED to
primary circuit by IC7A. The feeback error is
converted to current by IC7B and D3. The current
controlls IC1.
Secondary rectifier circuit : D4, D5, C8, C11
The secondary AC output of transformor is
rectified to DC voltage.
Secondary filter circuit : L1, L2, C9, C12
It minimizes the high frequency ripple noise,
which is caused by primary oscilation.
Samsung Electronics - Contents may change without notice.
Secondary DC/DC converter circuit : Q2, D8, L3,
C19
It changes the DC output voltage to 8.4V through
step-down chopper method.
Reverse current protection circuit : D6, D7
When power is off, it protects the reverse flow of
current from battery pack.
6-4-2 Control Part
MICOM CONTROLLER : HIC
HIC is include u-COM to controlled whole
charging system and include following internal
circuit :
-General Input/Output port
-A/D converter
-Reset delay circuit (Power on delay)
-Timer
It is carried following functions :
-Battery Recognition
-Charging termination condition detection
-Output short detection and output protection
-Temperature detection
BATTERY RECOGNITION CIRCUIT : HIC
Battery identity detection determined to voltage
detection battery internal between C/F and GND.
Circuit Description
6-7
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