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Circuit Description
6-8 Rapid Travel Charger
Rapid Charger, TC59-US is composed of power supply part and control part.
6-8-1 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 D1, D2, D3,
D4, C1 and C2. MOV1 is used by protection circuit
from AC power surge. F1 is fuse to prevent over
current. L1 and L2 is EMI noise protection filter of
switching power.
Switching controller and transformer
U1 supplies constant voltage and constant current
to secondary circuit through the transformer. D5,
D6 absorbs the reverse voltage when transformer
winding turns off.
SECONDARY POWER
Output constant voltage circuit : U4, D24, R17
The HIC detects output voltage and compares it
with reference voltage in HIC. The error is FED to
primary circuit by U2B. The feeback error is
converted to current by U2A and D7. The current
controlls U1.
Secondary rectifier circuit : D21, C21
The secondary AC output of transformor is
rectified to DC voltage.
6-14
Secondary filter circuit : L20, C22
It minimizes the high frequency ripple noise,
which is caused by primary oscilation.
Reverse current protection circuit : D20
When power is off, it protects the reverse flow of
current from battery pack.
6-8-2 Control Part
MICOM CONTROLLER : U4
U4 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 : U4
Battery identity detection determined to voltage
detection battery internal between ID and GND.
Samsung Electronics - Contents may change without notice.
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