- 18 –
ViewSonic Corporation
Confidential - Do Not Cop VX2262wm/wmp
4.3 PWPC BOARD BLOCK FUNCTION DESCRIPTION
PWPC board combines to adapter and inverter, Adapter which commonly consists
of bridge rectifier and filter, start circuit, PWM control circuit, protection circuits and
convert to 16V, 5V,5.1V DC voltage by input 90V-240V AC voltage that provide power
supply for each chips in the main board and inverter. Inverter is DC TO AC circuit. It
changes the 16v DC of power supply to about 600-800v AC that drives the backlight. It
mostly consists of starting circuit, PWM controller, DC changing circuit, LC surging
circuit, output circuit and protection circuit etc.
AC input
EMI filter
Bridge
Rectifier
and Filter
Start Circuit
R904, R905, R906
PWM
Control IC
Over
Voltage
Protect
Rectifier
CMOS
ON/OFF
Control
PWM
Control IC
Feedback
Circuit
OSC and
Output
Circuit
DC Convert
Circuit
MOSFET
Q804,Q809
Over
Voltage
CN902
Transformer
Lamp
5V
5.1V
ON/OF
DIM
16V
To Next Page
Loading...
Need help?
General