Rips Board Block Diagram - LG M1994A-PTJ Service Manual

50 ~ 60Hz
EMI
COMPONENTS
LINE
100 ~ 240V
1. EMI components.
This part contains of EMI components to comply with global marketing EMI standards like FCC,VCCI CISPR, the circuit included a
line-filter, across line capacitor and of course the primary protection fuse.
2. Input rectifier and filter.
This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor.
3. Energy Transfer.
This part function is for transfer the primary energy to secondary through a power transformer.
4. Output rectifier and filter.
This part function is to make a pulse width modulation control and to provide the driver signal to power switch, to adjust the duty
cycle during different AC input and output loading condition to achieve the dc output stabilized, and also the over power protection is
also monitor by this part.
5. Photo-Coupler isolation.
This part function is to feed back the DC output changing status through a photo transistor to primary controller to achieve the
stabilized DC output voltage.
6. Signal collection.
This part function is to collect the any change from the DC output and feed back to the primary through photo transistor.
Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes
LIPS Board Block Diagram
INPUT RECTIFIER
AND FILTER
PWM CONTROL
CIRCUIT
PRIMARY
Operation description_LIPS
ENERGY
HVDC
TRANSFER
PHOTO-COUPLER
ISOLATION
- 25 -
100KHz
OUTPUT RECTIFIER
AND FILTER
SIGNAL
COLLENT-
ION
SECONDARY
LGE Internal Use Only
12V
5V
GND