Dell 2005FPW - UltraSharp - 20.1" LCD Monitor Manuel d'entretien - Page 11

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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

7. Inverter

The inverter converts from DC12V to AC 840Vrms and operate back-light lamp of module.

INPUT RECTIFIER

AND FILTER

PWM CONTROL

CIRCUIT

PRIMARY

12V

Operation description_Power

HVDC

SWITCHING

TRANSFORMER

PHOTO

-COUPLER

ISOLATION

INVERTER CIRCUIT

- 11 -

100KHz

OUTPUT RECTIFIER

AND FILTER

SIGNAL

COLLENT-

ION

SECONDARY

High Voltage

12V

GND