Samsung SCH-210 service manual.pdf - Free

Circuit Description6-8 Rapid Travel ChargerRapid Charger, TC59-US is composed of power supply part and control part.6-8-1 Power Supply Part (Flyback typeSMPS circuit)AC INPUTAC input protection circuit and rectifier circuitAC power through the AC plug is rectifiered toDC power of high voltage through the D1, D2, D3,D4, C1 and C2. MOV1 is used by protection circuitfrom AC power surge. F1 is fuse to prevent overcurrent. L1 and L2 is EMI noise protection filter ofswitching power.Secondary filter circuit : L20, C22It minimizes the high frequency ripple noise,which is caused by primary oscilation.Reverse current protection circuit : D20When power is off, it protects the reverse flow ofcurrent from battery pack.6-8-2 Control PartSwitching controller and transformerU1 supplies constant voltage and constant currentto secondary circuit through the transformer. D5,D6 absorbs the reverse voltage when transformerwinding turns off.SECONDARY POWEROutput constant voltage circuit : U4, D24, R17The HIC detects output voltage and compares itwith reference voltage in HIC. The error is FED toprimary circuit by U2B. The feeback error isconverted to current by U2A and D7. The currentcontrolls U1.Secondary rectifier circuit : D21, C21MICOM CONTROLLER : U4U4 is include u-COM to controlled whole chargingsystem and include following internal circuit :-General Input/Output port-A/D converter-Reset delay circuit (Power on delay)-TimerIt is carried following functions :-Battery Recognition-Charging termination condition detection-Output short detection and output protection-Temperature detectionBATTERY RECOGNITION CIRCUIT : U4Battery identity detection determined to voltagedetection battery internal between ID and GND.The secondary AC output of transformor isrectified to DC voltage.6-14 Samsung Electronics - Contents may change without notice.